Citrex H4 Manual EN

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User Manual
CITREX H4

IMT Analytics AG
Gewerbestrasse 8
9470 Buchs (SG)
Switzerland
www.imtanalytics.com

Table of Contents
1

Introduction

Intended use

Safety instructions

3.1
3.2
3.3
3.4

7
7
7
7

Representation of hazards, cautions and notes
Personnel
Responsibility and guarantee
Service life

Symbol explanation

Start-up

5.1
5.2
5.3
5.4

Power supply
Mechanical connectors
Electrical interfaces
Replacing the CITREX battery

10
11
16
17

Operation

6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8

18
18
18
19
20
23
24
24

Switching the device on/off
Screen lock
Dim screen
User controls
Settings
Numerical readings
Graphical readings
Filter

Calibration

7.1
7.2

25
25

Zero point
Oxygen (O2) calibration

Connecting the device

8.1
8.2
8.3

27
28
28

General measurement setup
Measurement setup for checking ventilators
Measurement setup for gases at high pressure

Profile editor

9.1

Creating a profile

10 Configuration tool
10.1
10.2
10.3

PC minimum requirements
Web server
Monitoring option

31
31
32

11 Reading measurement data

11.1
11.2

Saving measurement data on the microSD card
Reading the data

12 Servicing and care
12.1

Preventive cleaning and servicing operations

34
34

35
35

13 Accessories and spare parts
13.1

Accessories table

36
36

14 Disposal

15 Directives and approvals

16 Specifications

16.1
16.2
16.3
16.4
16.5

Measurement parameters
Interface definition
Gas type
Power supply
Battery operation

17 Appendix
17.1
17.2
17.3
17.4
17.5
17.6
17.7
17.8

Principle of flow measurement
Trigger
Measurement parameters and units
Gas standards for flow and volume readings
Conversion factors
List of tables
List of figures
Index

39
41
42
42
42

43
43
43
45
46
47
48
48
49

Introduction

1
CITREX H4 was developed in order to measure flow and various pressures and thus
calculate a large number of ventilation parameters. CITREX H4 is a compact, mobile
and easy-to-operate measuring instrument. The integrated oxygen sensor makes
it possible for users to determine the oxygen concentration. The instrument is controlled using 4 buttons on the front of the device and it has a large number of different
interfaces for data analysis.
The descriptions and instructions in this manual refer to the product CITREX H4.
In this User Manual the unit "sL/min" is based on ambient conditions of 0 °C and
1013.25 mbar in accordance with DIN 1343.
This documentation applies to the following versions:
CITREX H4 software:
CITREX H4 hardware:

4.1.000
4.0

In the case of older or newer versions there may be discrepancies in relation to this
User Manual.
Subject to technical modifications without notice.

To avoid possible injuries, please read all the safety instructions before you use the product.

The device is not intended for use outside a building.

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Intended use

Intended use
This product is intended for testing and calibration purposes on medical devices
or systems that generate gas flows or gas pressures. That includes ventilators and
anaesthetic equipment. The user of the device has received training on how to use
medical equipment and can perform repairs, maintenance and servicing on medical
devices. The device can be used in hospitals, in clinics, at device manufacturers or
at independent service companies that perform repairs or servicing operations on
medical devices.

CITREX H4 is intended for use in a laboratory environment. It may only be used outside the nursing sector. It must not be used directly on patients or devices that are
connected to patients. The measuring instrument CITREX H4 is intended for overthe-counter sale.
With CITREX H4 you have the solution for measurements in the following areas:
•
•
•
•
•
•
•

Flow
Volume
Differential pressure
High pressure
Ambient pressure
Oxygen
Temperature

In addition, various ventilation parameters can be measured:
•
•
•
•
•
•
•
•
•
•

Ventilation rate
Time
Ratio
Ti / Tcyc
Tidal volume
Minute volume
Peak flow
Pressure
Compliance
Trigger

CITREX H4 is a measuring instrument for checking and calibrating
ventilators and anaesthetic equipment. It must not be used for patient
monitoring. During patient treatment by the ventilator it is not allowed
to connect to CITREX H4.
It is not allowed to measure liquids with CITREX H4.

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Safety instructions

Safety instructions
Please read all the safety instructions carefully before you use CITREX H4.

3.1

Representation of hazards, cautions and notes

This User Manual uses the representation below to specifically draw attention to
residual risks during intended use and emphasise important technical requirements.
Information and/or instructions and prohibitions to prevent damage of any kind, as
well as useful tips and information for handling the device, will be indicated by the
following icon:

3.2

Personnel

3.3

Responsibility and
guarantee

Work on and with CITREX H4 may only be performed by persons
who have undergone appropriate technical training and have the
necessary experience.

The manufacturer accepts no responsibility or guarantee and will exempt itself from
liability claims accordingly if the operator or any third parties:
•
•
•
•

Fail to use the device in accordance with its intended use.
Disregard the specifications.
Tamper with the device in any way (conversions, modifications or the like).
Operate the device with accessories that are not listed in the associated sets
of product documentation.

Although the device meets high quality and safety standards and it
has been constructed and tested according to the current state of
the art, it is not possible to rule out the risk of injuries with serious
consequences if the device is used in non-compliance with the intended use (improperly) or is misused.
Therefore please read through this User Manual carefully and keep
this documentation in a readily accessible place close to your device.

3.4

Service life

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The maximum service life of the device has been specified as 10 (ten) years, provided
it is handled properly in accordance with this User Manual.

Symbol explanation

Symbol explanation
The symbols listed below may appear on the packaging material, on the device rating
plate and in the User Manual of the CITREX H4 measuring instrument.

RS-232 interface
USB interface

SN BBXXXX

Serial number
Analog interface

CAN

CAN interface
Ethernet interface
On/Off button
SD card
Fragile contents
Keep dry
Read the User Manual
The device must not be disposed of in household waste
The device is CE approved
Caution: observe the safety instructions in the User Manual
Reusable packaging
Manufacturer's specification and date of manufacture
Keep away from heat
Temperature range for storage and transport
CSA monogram with C/US indicator
California Energy Commission Compliant

Table 1: Symbol explanation

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Start-up

Start-up
CITREX H4

Power supply plug with country-specific adapters

USB cable

5
MicroSD card

Dust filter RT019

Laminar inlet pipe

CITREX carrying case

Network cable

Car adapter

Adapter set

Table 2: Scope of delivery

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Start-up

5.1

Power supply

CITREX H4 can be operated from the mains or from the integrated battery.
Power can be supplied via the USB port (Mini B), the analog interface or the CAN
interface on the top of CITREX H4. Use the power supply unit included to charge the
battery or operate the device via the USB port. You will find more information about
power supply and how to configure the plugs in the section "Electrical interfaces".
During the charging process a green battery symbol is lit on the front.
Please connect the power supply unit included to a voltage of 100 VAC to 240 VAC
with a frequency of 50 Hz to 60 Hz.

Analog interface

CAN interface

USB port

Figure 1: Power supply

Before switching on, make sure the operating voltage of the power
supply unit agrees with the local mains voltage. You will find this
information on the rating plate on the back of the power supply unit.
When operating CITREX H4 via the USB port only use the original
power supply unit included!

The device indicates visually and audibly when the battery has to be
charged. Please do not store the battery in a depleted state.
Caution: depletion can damage the battery beyond repair!

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Start-up

5.2

Mechanical connectors

5.2.1
Flow channel
The flow channel can be used bidirectionally. The positive flow direction is from left
to right, viewed from the front of the device. The measurements of volume, flow, gas
temperature, oxygen and channel pressure are taken in the flow channel. The values,
and the ventilation parameters calculated from them, can be displayed on the screen.
You will find the relevant setting options in the section "Operation".

Flow (air)
Volume
Temperature
Oxygen
Pressure in flow
channel

Measuring range

± 300 sL/min

Accuracy

± 1.9 % of reading or ± 0.1 sL/min

Measuring range

0 – 10 sL

Accuracy

± 2 % of reading or ± 0.02 sL

Measuring range

0 – 50 °C

Accuracy

± 1.75 % of reading or 0.5 °C

Measuring range

0 – 100 %

Accuracy

± 1 % O2

Measuring range

−50 – 150 mbar

Accuracy

± 0.75 % of reading or ± 0.1 mbar

Flow channel

Figure 2: Flow channel

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Start-up

5.2.2
Differential pressure
This pressure connector measures the difference in pressure between the two connectors. If only one connector is used for a measurement, pressure measurement
takes place at ambient pressure. The measuring range is −200 mbar to +200 mbar.
Please comply with the maximum permissible pressure at the connector. The sensor
values from this pressure sensor can be displayed in the menu with the parameter
" PDiff ".

Differential pressure connector

Figure 3: Differential pressure connector

Measuring range ± 200 mbar
Accuracy
± 0.75 % of reading or ± 0.1 mbar

Pressures above 1 bar damage the differential pressure sensor beyond repair!

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Start-up

5.2.3
High pressure
The high-pressure connector measures the applied pressure up to 10 bar. It is recommended that the differential pressure connector be used for measurements up to
200 mbar. It is up to 100 times more accurate. The sensor values measured can be
displayed with the parameter " PHigh ".
The high-pressure connector can be fitted with a DISS adapter for air and oxygen.
You will find the ordering code in the section "Accessories and spare parts".

High-pressure connector

Figure 4: High-pressure connector

Measuring range 0 – 10 bar
Accuracy
± 1 % of reading or 10 mbar

Pressures above 15 bar damage the high-pressure sensor beyond
repair!

Do not use a tool to tighten the adapter on the high-pressure port
since this can damage the plastic casing. Please only tighten manually.

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Start-up

5.2.4
Oxygen sensor
CITREX H4 can measure the oxygen concentration in the flow channel. To do so, an
oxygen sensor is screwed into the appropriate port. The oxygen sensor has to be
connected to the measuring instrument using the cable included. The following steps
explain how to install and replace the oxygen sensor.

Oxygen sensor holder

Figure 5: Oxygen sensor holder

Measuring range 0 – 100 %
Accuracy
± 1 % O2 (absolute)

5.2.5
Installing the oxygen sensor
1. Remove the protective cap from the sensor port of the device.

Figure 6: Protective cap

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Start-up

2. Screw the oxygen sensor clockwise into the appropriate port. Make sure the sensor seals off the port and there is no leak.

Figure 7: Screwing in the oxygen sensor

3. Connect the cable included to the oxygen sensor by pushing the cable into the
hole at the top of the sensor until the cable locks into place. Connect the other end
of the cable to CITREX H4 by inserting it into the hole provided, which is labelled
"O2".

Figure 8: Oxygen sensor cable

4. Perform an oxygen calibration. The calibration procedure is described in the section "Calibration". Calibration ensures that the measured values of the new sensor
are correct.

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Start-up

5.3

Electrical interfaces

Figure 9 shows the available electrical interfaces of CITREX H4.

Figure 9: Electrical interfaces

MicroSD
card slot

O2 interface

USB port

Analog OUT

RS-232

CAN

Ethernet

The firmware of CITREX H4 is stored on the microSD
card. It also contains customised configurations and test
reports can be saved on the memory card. You will find
more information in the section "Reading measurement
data".
The oxygen sensor is connected to CITREX H4 via the
O2 interface. You will find further information on this in the
section "Oxygen sensor".
The USB port is used to operate the device from the
mains power supply and to charge the device battery but
it can also be used as a data interface. It is a " USB Mini-B
port".
The Analog Out port is used for reading analog signals. It
is also possible to connect an external trigger. Two ports
are reserved for mains operation and charging the device
battery. You will find the ordering code for the matching
connector in the section "Accessories and spare parts".
You will find additional technical information about the port
in the section "Interface definition".
The RS-232 port is used as a data interface. In the section "Interface definition " you will find further information
about the interface.
The CAN interface is prepared in the device but at present
it is not yet supported by the firmware. The CAN interface
can be used for charging the device battery. You will
find information about the port in the section "Interface
definition".
The Ethernet interface is used to configure the device and
it is used as a data interface. You will find more information in the section "Reading measurement data".

Table 3: Description of electrical interfaces

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Start-up

5.4

Replacing the CITREX battery

The battery of CITREX H4 can be replaced by the user. To do so, undo the two
screws on the back of the device and remove them. Then the battery can be removed and replaced. Check to make sure the new battery is inserted properly. For
this purpose the terminals must be above one another.

Figure 10: Replacing the battery

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Operation

Operation
This section describes how to use the device and what possible uses there are.

6.1

Switching the device on/off

The device is switched on and off at the On/Off button. Figure 11, section "User
controls", shows where this button is located on the device. To switch CITREX H4 on
you must press the On/Off button briefly. You will hear an audible signal. To switch
the device off you must press the On/Off button for about 1 second. If the device can
no longer be controlled, you have the option of pressing the On/Off button for about
6 seconds. The device is then forced to shut down.

6.2

Screen lock

Press the context button on the side of the device for 2 seconds. The screen shows
a message indicating that the screen is locked. To unlock the screen, press and hold
down the context button or one of the four buttons on the front for 2 seconds.

6.3

Dim screen

If the device is not operated by the user, the display of CITREX H4 shuts down after
about one minute and the four buttons start to flash. As soon as a button is pressed,
the screen comes on again.
The setting for how long it takes until the display is dimmed can be customised using
the configuration tool. You will find further information on this in the section "Configuration tool".

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Operation

6.4

User controls

1
2

10
3
9

6
7

Figure 11: User controls

Change, Edit

Context button; long press: key lock on/off

On/Off button

Menu button; zero point adjustment

Charge indicator

Flow direction indicator

Screen

Measurement values

Malfunction indicator

Display readings and scroll back

Table 4: User controls

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Operation

6.5

Settings

With the × button you return to the Settings menu. By pressing the button more than
once you can view the various settings of the measuring instrument.

6.5.1
Info display
This display provides information about the owner, the company, the next recommended calibration, the software version and the hardware revision. Settings concerning the owner can be edited with the configuration tool.

6
Figure 12: Info display

6.5.2
Battery indicator
The battery indicator informs you about the level of the battery charge.

Figure 13: Battery indicator

6.5.3
Ethernet interface
Here it is possible to make various settings for the network connection. With the 
button you can choose between the options "DHCP Client", "Default" and "Configured". The setting does not have to be confirmed and it is enabled as soon as it is
visible on the screen. More information about the settings is available in the section
"Web server".

Figure 14: Ethernet interface

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Operation

6.5.4
Trigger
With the trigger settings the start and end points of a ventilation parameter are defined. Three preset triggers are available. With the  button you can select the trigger
"Adult", "Pediatric" or "High Frequency". The trigger settings do not have to be saved
and they are enabled as soon as they are displayed on the screen. It is possible to
differentiate between flow trigger, pressure trigger and external trigger.
The settings can be changed with the configuration tool. You will find further information on this in the section "Configuration tool".

6
Figure 15: Trigger

The preset trigger settings are defined as follows.

Adult
3 L/min
Rising edge

Pediatric
1 L/min
Rising edge

High Frequency
3 L/min
Rising edge

Stop

− 3 L/min
Falling edge

− 1 L/min
Falling edge

− 3 L/min
Falling edge

Delay

60 ms

10 ms

Base flow

0 L/min

Start

Table 5: Trigger settings

6.5.5
Gas standard
The CITREX H4 measuring instrument can convert gas flow and volume readings to
various gas standards and display them. Care must be taken to ensure that on the
measuring instrument the same gas standard is set as the one on the device being
tested. With the  button you can switch between the various gas standards. As
soon as a gas standard is displayed, it is enabled. There is a list of available gas
standards in the Appendix in the section "Gas standards for flow and volume readings".

Figure 16: Gas standard

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Operation

6.5.6
Gas type
Under this menu item the gas type to be measured can be set. With the  button you
can switch between gas types. The gas type indicated is enabled and does not have
to be saved. In the section "Gas type" there is an overview of available gas types. Gas
types with adjustable oxygen concentrations, e.g. "Air O2 manual", can be changed
with the configuration tool.

Figure 17: Gas type

6.5.7
Gas humidity
The gas humidity of the gas being measured can be set. This has an impact on gas
flow measurement. With the  button the gas humidity can be changed in steps of
10. The value is enabled as soon as it is displayed on the screen.

Figure 18: Gas humidity

6.5.8
Setting the X-axis
Here the time axis of the graph view can be set. 2, 4, 6, 8 and 10 seconds are available for selection. The setting can be changed with the  button.

Figure 19: Setting the X-axis

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Operation

6.5.9
O2 calibration
The process of oxygen calibration is described in the section "Calibration". With the
 button you can choose between one-point calibration and two-point calibration.
Press the  button to start calibration.

Figure 20: O2 calibration

6.5.10 Profiles
With this settings item it is possible to call up and load the saved and preset profiles.
The  button switches between the available profiles and with the  button the profiles can be loaded. In CITREX H4 the following profiles are already integrated when
delivered: "Factory defaults", "Imperial units" and "Metric units". With the profile editor
you can create and save your own profiles. The procedure is explained to you in the
section "Creating a profile".

Figure 21: Profiles

6.6

Numerical readings

With the  button on the front of CITREX H4 you can display the various numerical
readings. If you press more than once, the view on the screen changes. The different views can be configured by web server. The web server and how to make the
settings are explained in the section "Web server". 1, 2, 4 and 6 readings can be
displayed in each configured view.

Figure 22: Numerical readings

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Operation

Gas standard

Trigger signal

Gas type

Reading

Measurement
parameter

Unit of measurement

The measured volume readings or gas flow readings can be
displayed with various gas standards. There is a list of standards
in the Appendix in the section "Gas standards for flow and volume
readings".
The icon appears as soon as a trigger condition is fulfilled. This
means that the time of appearance of the indicator is identified as
the start of inspiration. The indicator appears for 0.5 seconds. If
this signal is not displayed, the trigger settings should be adjusted
for the current ventilation mode.
The gas type currently set is displayed as text. It can be customised on the device under Settings.
This shows the current reading in the selected unit of measurement.
Indicates the measurement parameter currently selected. Measurement parameters can be changed in configuration; see section
"Configuration tool".
Indicates the unit of measurement currently selected. Units of
measurement can be changed in configuration; see section "Configuration tool".

Table 6: Numerical values

6.7

Graphical readings

By pressing the  icon on the front of CITREX H4, parameters currently being measured can be displayed in the form of graphs. For each screen view there are one and
two measurement curves available for selection. The relevant parameters and units
of measurement can be set using the configuration tool. You will find a description of
this in the section "Configuration tool".

Figure 23: Measurement curves

6.8

Filter

The screen of CITREX H4 is refreshed every 0.5 s. The recording of readings takes
place every 5 ms. Since CITREX H4 can record and display readings very quickly, it
is advisable to filter the readings. This is performed using a mean value. The extent to
which a reading is filtered can be set using the configuration tool.
The following filters are available:
• No filter (indication of the last value measured without any threshold)
• Low (mean above 240 ms)
• Medium (mean above 480 ms)
• High (mean above 960 ms)
The "high" filter is set by default.

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Calibration

Calibration
The various calibration options with CITREX H4 are described in this section. To avoid
incorrect measurements you must adhere to the procedures described here.

7.1

Zero point

This adjustment is necessary if indication of the differential pressure sensor (Pdiff), the
high-pressure sensor or a flow through open connection ports shows a value greater
or less than zero. This can occur if there are considerable temperature fluctuations,
or after the warming-up time. Zero calibration resets all values to zero. To perform
zero calibration you must remove all connected tubes from the device. Press the 
icon and keep it pressed for approx. 3 seconds. The screen shows a message "Zero
Offset – Calibrating, please wait".

7
Figure 24: Zero calibration

When you have switched on the device, individual displays may deviate slightly from the zero point until operating temperature has been
reached. Zero calibration should never be performed with the device
cold. Warming-up time is approx. 10 minutes.

During zero calibration there must be no pressure being applied to a
connection port, and care must be taken to ensure that there is no
flow through the flow channel.

7.2

Oxygen (O2) calibration

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There are two different methods of calibrating the oxygen cell. The variant in which
the oxygen cell is calibrated with air only takes about two minutes. The second variant consists of calibrating the oxygen cell with air and 100 % oxygen. This so-called
two-point calibration adjusts the oxygen sensor more accurately and takes about
four minutes. Calibration can be selected by pressing the  button more than once.

Calibration

7.2.1
Calibration with air
Make sure air is flowing through the flow channel at a rate of at least 30 L/min. To start
calibration, press the  button until you see the menu item
"O2 Calibration". With the  button you can switch between air and air and oxygen
(O2). Select the  button until "Air" appears on the screen in green letters. To start
calibration, press the  button.

Figure 25: Screen displays "Calibration Air"

7
7.2.2
Calibration with oxygen and air
For calibration of the oxygen cell with oxygen and air a gas flow of 30 L/min is used
in each case. Press the  button until you see the menu item "O2 Calibration". With
the  button you can switch between air and air and oxygen (O2). Press the  button
until the screen shows "O2 and Air" in green letters. To start calibration, press the 
button. Calibration for air and oxygen takes 120 seconds for each one.

Figure 26: Screen displays "Calibration Oxygen and Air"

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Connecting the device

Connecting the device
The measurement setup for CITREX H4 has an impact on flow measurement. To
obtain results that are as accurate as possible, comply with the instructions in this
section. It is important to ensure that the tubing in the measurement setup does not
have any radii, kinks or dents. You are also recommended to always use the inlet pipe
and the dust filter.

The measured gases must be free of oil, grease and dust.

8.1

General measurement setup

The general measurement setup applies to gas flow measurement. The RT019 filter included and the inlet pipe must be used. This ensures laminar flow to the flow
sensor unit. The filter also prevents dust, oil and grease from contaminating the
CITREX H4 measuring instrument and thus prevents discrepancies in measurement
results. The measurement setups shown below are dependent on the direction of
gas flow being measured.
CITREX H4
ATP

CITREX H4
ATP

Air O2 man

Ppeak
mbar

PEEP
mbar

Air O2 man

Ppeak
mbar

PEEP
mbar

CITREX H4
ATP

Air O2 man

Ppeak
mbar

PEEP
mbar

Air O2 man

Ppeak
mbar

PEEP
mbar

Figure 27: General measurement setup

CITREX H4
ATP

Air O2 man

Ppeak
mbar

PEEP
mbar

The measurement setups listed below are unsuitable and produce inaccurate measurement results. Kinks, tees and angle pieces should be avoided in the flow channel.
They cause turbulence in the gas being measured and hence inaccurate or incorrect
measurement results.
CITREX H4

ATP

Air O2 man

Ppeak
mbar

PEEP
mbar

CITREX H4
ATP
Ppeak
mbar

CITREX H4

Air O2 man

ATP

Bad setup: Kinks, tees,
angle pieces at the device inlet
5
PEEP
mbar

CITREX H4

ATP
Ppeak
mbar
PEEP
mbar

CITREX H4

Air O2 man

ATP

Air O2 man

Ppeak
mbar

PEEP
mbar

5
ATP

Air O2 man

Ppeak
mbar

PEEP
mbar

CITREX H4
ATP

Air O2 man

CITREX H4
ATP

Air O2 man

Ppeak
mbar

PEEP
mbar

Figure 28: Bad setup

Air O2 man

Ppeak
mbar

PEEP
mbar

CITREX H4
ATP

Air O2 man

Ppeak
mbar

PEEP
mbar

EasyLung

CITREX H4
ATP

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Ppeak
mbar

Air O2 man

Ppeak
mbar

PEEP
mbar

Connecting the device
CITREX H4
ATP

8.2

CITREX H4

Air O2 man

ATP

CITREX H4
ATP

Air O2 man

Ppeak
mbar

PEEP
mbar

Measurement setup for
checking ventilators

CITREX H4 is ideal for checking ventilators. The best measurement results are
achieved with the measurement setup shown below. Make sure the test lung is connected to the grey aluminium connection port of CITREX H4.

Breathing circuit

Filter

Inlet pipe

EasyLung

CITREX H4
ATP

Air O2 man

Ppeak
mbar

PEEP
mbar

Test lung

CITREX H4

Figure 29: Measurement setup for checking ventilators

8.3

Measurement setup for gases
at high pressure

CITREX H4 compensates for the gas pressure during flow measurement. In the flow
channel, gas pressures up to 150 mbar are compensated. For gases at higher pressures the high-pressure sensor can be used. For this purpose connect the device
outlet to the high-pressure sensor. In the menu "Settings", "Measurement" you must
also switch the "Pressure Compensation" setting to "Pressure High".
In the flow channel, pressures up to 150 mbar can be compensated. In conjunction with the high-pressure sensor, pressures up to
300 mbar can be compensated. Pressures in the flow channel above
800 mbar can damage the device.

1MPa (10bar)

Figure 30: Measurement setup for gases at high pressure

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Profiles

Profile editor
The user has the option of saving different profiles to suit personal requirements. To
be able to use the profile editor it is essential to have Microsoft Internet Explorer with
the browser plug-in Silverlight.

9.1

Creating a profile

To create a profile, remove the SD card from CITREX H4 and connect it to your PC
via an SD card reader. Then open the drive of the SD card. There you will find the file
"ProfileEditor.html", which has to be opened using Internet Explorer, resulting in the
picture below.

Figure 31: Profile editor in Internet Explorer

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Profiles

Now you can create a new profile by making the settings in the "configuration" menu.

Figure 32: Profile editor "configuration"

This is where parameters, measurement curves, triggers, interfaces, etc. can be defined. These can be saved, as shown in the picture "Profile editor in Internet Explorer". You can also add a description to the profile. Save the new profile with the "Save
profile" button. Save the file in the "Profiles" folder on the SD card. When you have
saved the new profile on the SD card, place the card back in CITREX H4 and start the
device. The newly created profile can be loaded in the "Profiles" menu.

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Configuration tool

10 Configuration tool
The configuration tool can only be used with Microsoft Internet Explorer.

10.1 PC minimum requirements

Microsoft® Silverlight 5 or higher
Windows x86 or x64 (64-bit mode only supports IE) 1.6 GHz or higher
with 512 MB RAM
Macintosh (Intel based) Intel Core Duo 1.83 GHz or higher with 512 MB RAM
Microsoft® Windows® 10, 8.1, 8, Windows Server 2012, 7, 7 SP1,
Windows Server 2008 SP2, Windows Server 2008 R2 SP1, Vista
Macintosh OS 10.6 (Intel based), MacOS 10.7 – 10.11 (Intel based)
Ethernet network connection
Screen resolution 1024 × 768 (1280 × 1024 recommended)

10.2 Web server

The Ethernet port on CITREX H4 enables access to the device via a network. The
measured real time data can be tracked and analysed on the computer. Settings can
also be made on the device via the web browser using the so-called configuration
tool. To be able to use the web server it is essential to have an installed Internet Explorer with Microsoft Silverlight 5.
There are three different setting options to establish a connection between
CITREX H4 and a computer. Tap the  button until the "Ethernet" menu item appears. You will find a description of the settings in the following sections.

10.2.1 Default
These are default settings that cannot be changed. These settings are recommended
in order to establish a direct connection to the computer via an Ethernet cable. The
configuration on CITREX H4 is as follows:
IP Address:
Subnet Mask:

192.168.1.1
255.255.255.0

To establish a connection, the network settings on the computer must be changed.
For this purpose open the network settings of the computer, which are located in
the Control Panel. Then open the "Internet Protocol Version 4 (TCP/IPv4)" settings.
Enter an IP address between 192.168.1.2 and 192.168.1.255 and subnet mask
255.255.255.0 in the form on the screen. Confirm with "OK".
Now open Internet Explorer and enter IP address 192.168.1.1 in the address field.
The connection to CITREX H4 is established.

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Configuration tool

10.2.2 Configured
This setting option is suitable for connecting CITREX H4 to a network that does not
have a DHCP server. Define an IP address and a subnet mask using the configuration tool on CITREX H4. When the settings have been confirmed the device can
be connected up to the network and be accessed using the defined IP address via
Internet Explorer.

10.2.3 DHCP
To connect CITREX H4 to a DHCP server, first connect CITREX H4 to the network. In
the "Ethernet" menu select the setting "DHCP" and confirm it with "OK". With the IP
address shown on the display it is possible to establish a connection to CITREX H4
via Internet Explorer.

10.3 Monitoring option

In the "Monitoring" menu item it is possible to access the measurement data of
CITREX H4 via the network. Either numerical readings or graphical measurement
curves can be selected.

10.3.1 Numerical readings
Here it is possible to directly track real-time measurement data on the computer
monitor. Both current readings and a minimum, a maximum and a mean are calculated for each reading. Statistical analysis can be restarted by pressing the "Reset"
button. There is also the option of exporting the readings currently being displayed.
To do this, press the "Export" button: an Explorer window opens in which you can
select the storage location and the storage type. There are XML files (*.xml) and CSV
files (*.csv) available for selection.

Figure 33: Monitoring numerics

IMT Analytics AG

Configuration tool

10.3.2 Graphical readings
Here it is possible to directly track real-time curves on the computer monitor. Select
the required reading using the pull-down menu. By pressing the "Run" button it is
also possible to record readings for 300 seconds. Recording can be terminated by
pressing the "Freeze" button. If you have recorded a measurement, you can move
the slider into the desired measuring time in order to analyse the period here. Incidentally, it is not only the displayed measurement curves that are recorded; all the readings available for selection are also recorded. There is also the option of exporting the
measurement curves currently being displayed. To do this, press the "Export" button:
an Explorer window opens in which you can select the storage location. The curves
can be saved in the form of a PNG file.

Figure 34: Monitoring panels

IMT Analytics AG

Reading measurement data

11 Reading measurement data
The files on the microSD card must not be renamed or deleted under
any circumstances.

Measurement data can be read via the microSD card, via the Analog
OUT interface or via the RS-232 interface. For information about
using these interfaces please contact your dealer or IMT Analytics
directly.

11.1 Saving measurement data on
the microSD card

Press the  button and keep it pressed for approx. 3 seconds. A snapshot of all the
parameters is taken in a CSV file and saved on the SD card.

11.2 Reading the data

The data can be read directly from the SD card. For this purpose you must disconnect the SD card from CITREX H4 by pressing the SD card once. It is possible to
connect the card to your computer directly using an SD card reader.
The memory card of CITREX H4 contains the following data and folders.

Folder or file
DATA
LOGS

11
*.CFG, *.SCR, *.TRG files
Formatter\SetupReportFormatter.bat
Formatter\AboutReportFormatter.txt
Formatter\ReportFormatter.xlsb
Clientaccesspolicy.xml
index.html
USB-Driver\usb_cdc_ser.inf

Description
In this directory you will find the readings that have
been saved.
CITREX H4 continuously records information about
its functions and saves it in the form of log files.
This data is only used for remedying malfunctions
and resolving issues.
CFG, SCR and TRG files are required by CITREX H4 to activate internal processes.
This batch file is required to format saved data in
an Excel file.
This TXT file describes the procedure for formatting saved data in an Excel file.
This is the actual Excel file template in in which the
saved data is formatted.
This file is required for the configuration tool.
This file is required for the configuration tool.
Driver for the USB device identification.

Table 7: Folder structure of CITREX H4

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Servicing and care

12 Servicing and care
Careful servicing in compliance with the instructions is essential for ensuring that
CITREX H4 operates safely and efficiently. Only components recommended by the
manufacturer may be used.

It is absolutely essential to comply with the guidelines and servicing
instructions issued by the various manufacturers.

The servicing operations listed below may only be performed by
persons who are familiar with CITREX H4. All further repair work may
only be performed by authorised trained professionals. Please also
observe the information issued by the various manufacturers.

12.1 Preventive cleaning
and servicing operations

To ensure that your device operates with precision and reliability for as long as possible, it is essential to perform the following servicing routines regularly.

12.1.1 During operation
Use of the filter included and the inlet pipe in order to protect the device against contamination. Make sure the device is only used inside a building.

12.1.2 Every 4 weeks
Check the bacterial filter for soiling. For this purpose the inlet and outlet of the filter
must be connected to the differential pressure port using two tees. In this way the
pressure drop above the filter can be measured. The pressure drop must not exceed
a value of 2 mbar at a flow of 60 L/min. Otherwise the filter must be replaced.

12.1.3 Every 12 months
Factory calibration and servicing to ensure reliable measurement; it may only be performed by IMT Analytics or an authorised partner.
To have CITREX H4 calibrated at the manufacturer's, IMT Analytics, visit the website
www.imtanalytics.com/easycal
The EasyCal service makes it possible for users to have CITREX H4 calibrated and
adjusted quickly and easily. The annual servicing procedure is also performed.

IMT Analytics AG

Accessories and spare parts

13 Accessories and spare parts
On the website www.imtanalytics.com you will find the original spare parts and other
products from IMT Analytics.
Ordering address:
IMT Analytics AG
Gewerbestrasse 8
CH-9470 Buchs, Switzerland
Tel:
+41 (0) 81 750 67 10
Email: sales@imtanalytics.com
Orders can also be placed in our Webstore.
13.1 Accessories table

Options
302.159.000

Warranty extension (plus 2 years) CITREX H4

Servicing
000.000.012

Calibration & Servicing CITREX H4

000.000.014

Receiving inspection of CITREX H4

302.160.000

Triple Calibration & Servicing Package for CITREX H4

Accessories & Consumables

300.548.000

Adapter set

301.997.000

Car adapter for CITREX

302.077.000

Laminar inlet pipe

304.161.000

Black protective pouch for CITREX

304.161.001

Red protective pouch for CITREX

304.161.002

Blue protective pouch for CITREX

500.030.000

High-pressure adapter DISS O2

500.030.002

High-pressure adapter DISS Air

301.851.000

MicroSD memory card

302.075.000

RS-232 interface cable

301.672.000

Analog output terminal connector

301.655.000

Blind plug for oxygen connector (rubber)

302.178.000

Blind plug for oxygen connector (solid)

301.624.000

Oxygen sensor with mono jack

302.531.000

Bacterial filter RT019

304.714.000

CITREX stand

Spare parts
301.936.000

Carrying case for CITREX H4

301.625.000

Battery for CITREX

301.563.000

Network cable

301.673.000

USB cable for CITREX

301.653.000

Oxygen sensor cable

304.578.000

Power supply plug for CITREX

302.780.000

Flow channel protective cap

Table 8: Accessories

IMT Analytics AG

Disposal

14 Disposal
Disposal of the device is the operator's responsibility. The device can …
• be delivered, carriage free and duty paid, to the manufacturer for disposal.
• be handed over to a licensed private or public collection company.
• be professionally broken down into its constituent parts by the operator and
be recycled or disposed of in accordance with regulations.
In the case of self-disposal the disposal regulations are country-specific and are contained in relevant laws and ordinances. These codes of conduct must be obtained
from the authorities responsible.
In this context, wastes must be recycled or destroyed …
• without endangering human health.
• without using processes or methods that harm the environment, especially
water, air, soil, animals and plants.
• without causing noise or odour nuisances.
• without having a detrimental effect on the surroundings or landscape.

IMT Analytics AG

Directives and approvals

15 Directives and approvals
•
•
•
•
•
•
•

CE
CAN/CSA-C22.2 No. 61010-1-12
UL Std. No. 61010-1 (3rd Edition)
IEC 61010-1 2010
IEC 61326-1 2012
ETSI EN 301 489-17 V3.1.0
FCC Part 15, Subpart B, Digital Devices, Emission Class B

CE Declaration of Conformity
2014/35/EU (LVD)
DIRECTIVE 2014/35/EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL
of 26 February 2014 on the harmonisation of the laws of the Member States relating
to the making available on the market of electrical equipment designed for use within
certain voltage limits tested according to EN61010-1:2010
2014/30/EU (EMC)
DIRECTIVE 2014/30/EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL
of 26 February 2014 on the harmonisation of the laws of the Member States relating
to electromagnetic compatibility tested according to EN61326-1:2013

IMT Analytics AG

Specifications

16 Specifications
16.1 Measurement parameters

Flow and pressure measurement

Measuring range

Accuracy

± 1.9 % * or ± 0.1 sL/min **

Air and N2
Flow measurement

± 300 sL/min ***

Temperature compensated

Yes

Ambient pressure compensated

Yes

Channel pressure compensated

Yes

−50 – 600 mbar

Flow measurement

± 300 sL/min ***

± 1.9 % * or ± 0.1 sL/min **

Temperature compensated

Yes

Ambient pressure compensated

Yes

Channel pressure compensated

Yes

−50 – 600 mbar

Flow measurement

± 140 sL/min ***

3 % * or ± 0.1 sL/min **

Temperature compensated

Yes

25 – 30 °C

Ambient pressure compensated

Yes

Channel pressure compensated

Yes

O2 / air mixtures

CO2

−50 – 600 mbar

Heliox (21 % O2/79 % He)
Flow measurement

± 300 sL/min ***

± 4 % * or ± 0.3 sL/min **

Temperature compensated

Yes

25 – 30 °C

Ambient pressure compensated

Yes

Channel pressure compensated

Yes

−50 – 600 mbar

N2O / O2 mixtures
Flow measurement

± 80 sL/min ***

± 4 % * or ± 0.3 sL/min **

Temperature compensated

Yes

25 – 30 °C

Ambient pressure compensated

Yes

Channel pressure compensated

Yes

−50 – 600 mbar

High

0 – 10 bar

± 1 % * or ± 10 mbar **

Difference

± 200 mbar

± 0.75 % * or ± 0.1 mbar **

In flow channel

−50 – 150 mbar

± 0.75 % * or ± 0.1 mbar **

Barometer

500 – 1150 mbar

±1 % * or ± 5 mbar **

Pressure

Table 9: Measurement parameters

IMT Analytics AG

Specifications

Additional readings
Oxygen concentration
(pressure compensated ≤
150 mbar)
Gas temperature****

Measuring range

Accuracy

0 – 100 %

± 1 % O2 **

0 – 50 °C

± 1.75 % *
or ± 0.5 °C **

Gas type

Air, Air/O2, N2O/O2,
Heliox (21 % O2), N2, CO2
ATP, ATPD, ATPS, AP21, STP,
STPH, BTPS, BTPS-A, BTPD,
BTPD-A, 0/1013, 20/981,
15/1013, 25/991, 20/1013,
NTPD, NTPS

Gas standard

Units of measurement
Flow
Pressure

L/min, L/s, cfm, mL/min,
mL/s
bar, mbar, cmH2O, inH2O,
Torr, inHg, hPa, kPa, mmHg,
PSI

Table 10: Additional readings

It is the larger tolerance that applies: * Tolerance in relation to the reading ** Absolute tolerance
*** In this User Manual the unit sL/min is based on ambient conditions of 0 °C and 1013.25 mbar (DIN1343)
**** CITREX H4 measures gas temperature inside the measurement channel. While CITREX H4 is warming
up, the temperature of the measurement channel, and hence also the temperature of the gas inside
the measurement channel, rises at the same time. The measurement channel volume is relatively small,
even for relatively high volumetric flows (e.g. PIF @ 60 L/min). If the temperature of the gas on entering
CITREX H4 is compared with gas temperature in the measurement channel, it becomes evident that the
temperature in the measurement channel is higher. Therefore the temperature of the gas entering the
CITREX H4 measurement channel should not be expected to equal the temperature displayed on the
screen because the temperature displayed is measured inside the CITREX H4 measurement channel.

Ventilation parameters

Measuring range

Accuracy

Rate

Breaths/min

1 – 1000 breaths/min

± 1 breath or ± 2.5 % **

Time

Ti, Te

0.05 – 60 s

± 0.02 s

Ratio

I:E

1:300 – 300:1

± 2.5 % *

Ti/Tcyc

0 – 100 %

±5%*

Vti, Vte

± 10 sL

± 2 %* or ± 0.20 mL
(> 6 sL/min)**

Peak flow

PFInsp/PFExp

± 300 sL/min

± 1.9 % * or ± 0.1 sL/min **

Pressure

PPeak, PMean
PEEP, PPlateau,
IPAP

0 – 150 mbar

± 0.75 % * or ± 0.1 mbar **

Compliance

CStat

0 – 1000 mL/mbar

± 3 % * or ± 1 mL/mbar **

Trigger

Adult, Pediatric,
HFO Flow,
Pressure and
External

Tidal volume

Table 11: Ventilation parameters

IMT Analytics AG

Specifications

General information
Screen
Real-time curves

1.7" colour display

Interfaces

Flow, pressure, volume, temperature, oxygen, ventilation parameters
RS-232, USB, Ethernet, CAN, Analog Out, TTL,

AC input

100 – 240 VAC (50/60 Hz)

Battery operation

4 hours

Dimensions (W × D × H)

11.4 × 7 × 6 cm

Weight

0.4 kg

Calibration interval

Once a year

Memory card

Yes

Operating data
Ambient temperature

15 – 40 °C (59 – 104 °F)

Air humidity

10 – 90 % RH

Ambient pressure

783 – 1150 mbar

Storage and transport conditions

−10 – 60 °C (14 – 140 °F) at 5 – 95 % RH

Degree of soiling

Degree of soiling 2, to IEC 61010-1

Table 12: General information and operating data

16.2 Interface definition

Interface
Analog OUT

RS-232

CAN

Pin assignment
Pin 1: Analog OUT 1
Pin 2: Analog OUT 2
Pin 3: Trigger Input
Pin 4: VIN
Pin 5: GND
Pin 1: NC
Pin 2: RxD (Input)
Pin 3: TxD (Output)
Pin 4: GND
Pin 1: VIN
Pin 2: CANH
120 Ω
Pin 3: CANL
Pin 4:
Connectable
terminating resistor
Pin 5:
Pin 6: GND

Range
0 – 5 VDC ± 1.8 %, load ≥ 5 kΩ
0 – 5 VDC ± 1.8 %, load ≥ 5 kΩ
5 – 24 VDC
12 VDC ± 20 % – 24 VDC ± 20 %

12 VDC ± 20 % – 24 VDC ± 20 %

Table 13: Interfaces
Figure 35: Interface definition

IMT Analytics AG

Specifications

16.3 Gas type

The gas type measured must agree with the setting on CITREX H4. Please select the
correct gas type in the settings.
The following gas types are available for selection:
• Air
100 %
• Air/O2-Man. Air/oxygen mixture according to manual input; the default is
100 % O2
• Air/O2-Auto. Air/oxygen mixture according to sensor measurement of
internal oxygen cell
• N2O/O2-Man. Nitrous oxide / oxygen mixture according to manual input; the default is 100 % O2
• Heliox
21 % O2 /79% He
• N2
100 %
• CO2
100 %
Standard conditions are understood to mean defined conditions for pressure, temperature and, in some cases, humidity, which constitute the basis for converting the
flow actually measured. Therefore it is essential to check which standard condition
the value displayed will relate to.
The standard currently set is indicated on the numerical and graphical display.

A gas type that has not been selected properly and a gas standard that has not been selected properly can lead to measuring errors
of up to 20 %.

16.4 Power supply

Input voltage of the power supply unit
Supply voltage
Power input

16.5 Battery operation

Operating time in battery operation

100 – 240 VAC, 50 – 60 Hz
5 VDC
2.5 – 6 W

4 hours*

Charging the battery A complete charging process takes 5 to 8 h,
depending on which connection port is used
for charging. The service life of the battery is
extended if the battery is charged completely
only after a prompt by the device.
* This operating time is reached in non-networked operation (i.e. the interfaces are not in use or they are
switched off)

IMT Analytics AG

Appendix

17 Appendix
17.1 Principle of flow measurement

Flow in the flow channel is determined by differential pressure measurement. To build
up differential pressure a linear flow element is used to provide flow resistance.

Δp = c1 × η × Q + c2 × ρ × Q2

η: dynamic viscosity of the gas [Pa s]
ρ: gas density [kg/m3]
c1, c2: device-specific constants (channel geometry)

Dynamic viscosity
• T
he viscosity of the medium is its resistance to flow and shear.
• Viscosity is extremely dependent on temperature.
• The viscosity of a medium is slightly dependent on the pressure and moisture
content of the medium.
Density
• Density is the unit for the mass per unit volume of the medium.
• Viscosity is extremely dependent on temperature.
• The viscosity of a medium is slightly dependent on the pressure and moisture
content of the medium.

17.2 Trigger

Triggers are used to define start and end points of cyclical signals. With regard to
pressure and flow curves the trigger makes it possible to determine inhalation and
exhalation. The resulting information constitutes the basis for ventilation parameter
calculation. If the trigger is not set properly or if it is not possible to detect a trigger,
the ventilation parameters will be calculated incorrectly or not at all.

17
Figure 36: Trigger

IMT Analytics AG

Appendix

17.2.1 Flow trigger
On CITREX H4 a flow trigger can be set. When the set flow is reached, the trigger
is activated. In this context it is essential to specify whether at the start and end of a
cycle the trigger is to be activated by a rising edge or a falling edge. Flow measurement in the flow channel serves as the trigger source. CITREX H4 can be operated
bidirectionally.

17.2.2 Pressure trigger
In the case of a pressure trigger it is the pressure measured in the flow channel that
serves to activate measurement. Whereby the direction of flow is of no consequence.

17.2.3 Base flow
Base flow is a constant flow that must not be included in volume calculation. If, for
example, a system has a defined leak, resulting in a constant discharge of 3 L/min,
those 3 L/min are not included in the inspiratory volume. The 3 L/min can be entered
as a trigger setting so they will not be taken into account.

17.2.4 Delay
With a delay it is possible to filter out signal errors or noise and prevent false triggering. As a result, a trigger is only activated if the set trigger level continues to apply
after the delay time. If the trigger level is no longer reached after the delay time, no
trigger is activated. The delay time can be set.

Figure 37: Delay

IMT Analytics AG

Appendix

17.3 Measurement parameters and units
Pressure readings

Flow readings

Meteorological readings

Gas concentrations

Ventilation parameters

Measurement parameter

Designation

Units of measurement

Ambient pressure
Pressure high
Pressure in flow channel high
Differential pressure

PAtmo
PHigh
PChannel
PDiff

mbar, bar, inH2O, cmH2O, psi,
Torr, inHg, mmHg, hPa, kPa

Measurement parameter

Designation

Units of measurement

Flow

L/min, mL/min, cfm, L/s, mL/s

Measurement parameter

Designation

Units of measurement

Temperature
Oxygen content
Volume

Temp.
O2
Volume

°C, K, °F
%
mL, L, cf

Measurement parameter

Designation

Units of measurement

Gas concentration
Partial pressure

%
mbar, bar, inH2O, cmH2O, psi,
Torr, inHg, mmHg, hPa, kPa

Measurement parameter

Designation

Units of measurement

Positive end-expiratory pressure
Mean pressure
Inspiratory positive airway pressure
Maximum pressure
Plateau pressure

PEEP
PMean
IPAP
PPeak
PPlateau

Expiratory minute volume
Inspiratory minute volume
Inspiratory peak flow
Expiratory peak flow

Ve
Vi
PFInsp
PFExp

Expiratory volume
Inspiratory volume
Ventilation rate
Inspiratory/expiratory ratio
Expiratory time
Inspiratory time
Compliance

Vte
Vti
Rate
I:E
Te
Ti
CStat

mbar, bar, inH2O, cmH2O, psi,
Torr, inHg, mmHg, hPa, kPa

L/min, mL/min, cfm, L/s, mL/s

mL, L, cf
mL, L, cf
Breaths/min
s
s
mL/mbar, L/mbar, mL/cmH2O,
mL/cmH2O

Table 14: Measurement parameters and units

IMT Analytics AG

Appendix

17.4 Gas standards for flow and volume readings
CITREX H4 converts the flow and volume readings measured in the device to match the conditions of the standard selected. The
following gas standards are supported by CITREX H4.
Gas standard

Abbreviation

Pressure

Temperature

Relative
humidity

Ambient Temperature and Pressure

ATP

Current ambient pressure

Current
gas temperature

Current
gas humidity

Ambient Temperature and Pressure Dry

ATPD

Current ambient pressure

Current
gas temperature

Ambient Temperature and Pressure Saturated

ATPS

Current ambient pressure

Current
gas temperature

100 %

Ambient Pressure at 21 °C

AP21

Current ambient pressure

21.0 °C (70 °F)

Current
gas humidity

Standard Conditions USA

STP

1013.25 mbar (760 mmHg)

21.0 °C (70 °F)

Standard Conditions USA Humid

STPH

1013.25 mbar (760 mmHg)

21.0 °C (70 °F)

Current
gas humidity

Body Temperature and Pressure, Saturated

BTPS

Current ambient pressure
+ channel pressure

37.0 °C (99 °F)

100 %

Body Temperature and (Ambient) Pressure Saturated according to ISO 80601-2-12:2011

BTPS-A

Current ambient pressure

37.0 °C (99 °F)

100 %

Body Temperature and Pressure Dry

BTPD

Current ambient pressure
+ channel pressure

37.0 °C (99 °F)

Body Temperature And (Ambient) Pressure Dry

BTPD-A

Current ambient pressure

37.0 °C (99 °F)

Standard Conditions to DIN1343

0/1013

1013.25 mbar (760 mmHg)

0.0 °C (32 °F)

Standard Conditions to
ISO 1-1975 (DIN 102)

20/981

981 mbar (736 mmHg)

20.0 °C (68 °F)

API Standard Conditions

15/1013

1013.25 mbar (14.7 psia)

15.0 °C (60 °F)

Cummings Standard

25/991

991 mbar (500 ft altitude)

25.0 °C (77 °F)

20 °C/1013 mbar

20/1013

1013.25 mbar (760 mmHg)

20.0 °C (68 °F)

Normal Temperature and Pressure

NTPD

1013.25 mbar (760 mmHg)

20.0 °C (68 °F)

Normal Temperature and Pressure, Saturated

NTPS

1013.25 mbar (760 mmHg)

20.0 °C (68 °F)

100 %

Table 15: Gas standards for flow and volume readings

IMT Analytics AG

Appendix

17.5 Conversion factors
Value
1 mbar

1 bar

Equivalent
0.001

bar

100

hPa

0.1

kPa

0.75006

torr

(760 torr = 1 atm.)

0.75006

mmHg

(at 0 °C)

0.02953

inHg

(at 0 °C)

1.01974

cmH2O

(at 4 °C)

0.40147

inH2O

(at 4 °C)

0.01450

psi, psia

1000
0.1

mbar
Pa

1000

hPa

100

kPa

750.06

torr

(760 torr = 1 atm.)

750.06

mmHg

(at 0 °C)

inHg

(at 0 °C)

29.53
1019.74
401.47
14.50

cmH2O

(at 4 °C)

inH2O

(at 4 °C)

psi, psia

Table 16: Conversion factors

IMT Analytics AG

Appendix

17.6 List of tables

Table 1: Symbol explanation
Table 2: Scope of delivery
Table 3: Description of electrical interfaces
Table 4: User controls
Table 5: Trigger settings
Table 6: Numerical values
Table 7: Folder structure of CITREX H4
Table 8: Accessories
Table 9: Measurement parameters
Table 10: Additional readings
Table 11: Ventilation parameters
Table 12: General information and operating data
Table 13: Interfaces
Table 14: Measurement parameters and units
Table 15: Gas standards for flow and volume readings
Table 16: Conversion factors

8
9
16
19
21
24
34
36
39
40
40
41
41
45
46
47

17.7 List of figures

Figure 1: Power supply
Figure 2: Flow channel
Figure 3: Differential pressure connector
Figure 4: High-pressure connector
Figure 5: Oxygen sensor holder
Figure 6: Protective cap
Figure 7: Screwing in the oxygen sensor
Figure 8: Oxygen sensor cable
Figure 9: Electrical interfaces
Figure 10: Replacing the battery
Figure 11: User controls
Figure 12: Info display
Figure 13: Battery indicator
Figure 14: Ethernet interface
Figure 15: Trigger
Figure 16: Gas standard
Figure 17: Gas type
Figure 18: Gas humidity
Figure 19: Setting the X-axis
Figure 20: O2 calibration
Figure 21: Profiles
Figure 22: Numerical readings
Figure 23: Measurement curves
Figure 24: Zero calibration
Figure 25: Screen displays "Calibration Air"
Figure 26: Screen displays "Calibration Oxygen and Air"
Figure 27: General measurement setup
Figure 28: Bad setup
Figure 29: Measurement setup for checking ventilators
Figure 30: Measurement setup for gases at high pressure
Figure 31: Profile editor in Internet Explorer
Figure 32: Profile editor "configuration"
Figure 33: Monitoring numerics
Figure 34: Monitoring panels
Figure 35: Interface definition
Figure 36: Trigger
Figure 37: Delay

10
11
12
13
14
14
15
15
16
17
19
20
20
20
21
21
22
22
22
23
23
23
24
25
26
26
27
27
28
28
29
30
32
33
41
43
44

IMT Analytics AG

Appendix

17.8 Index

Accessories 36
Analog OUT 16
Approvals 38

Filter 24
Flow and volume readings 46
Flow channel 11
Flow measurement 43

Notes 7
Numerical readings 23, 32

O2 25
O2 interface 16
Operating time 42
Operation 18
Options 36
Oxygen 25
Oxygen sensor 14
Oxygen sensor, installing 14

B
Battery depletion 10
Battery operation 42
Battery replacing 17

C
Calibration 25
Calibration with air 26
Calibration with oxygen and air 26
CAN 16
CAN interface 10
Care 35
Charging the battery 42
Cleaning 35
Connecting the device 27
Conversion factors 47

Gas concentrations 45
Gas standard 24
Gas standards 46
Graphical readings 24, 33

H
High pressure 13

I
Intended use 6
Interface definition 41

P
PC minimum requirements 31
Personnel 7
Power supply 10, 42
Pressure readings 45
Profile editor 29
Profiles 29

Lock screen 18
Default 31
DHCP 32
Differential pressure 12
Dim screen 18
Directives 38
Disposal 37
DISS adapter 13
Dynamic viscosity 43

E
Electrical interfaces 16
Ethernet 16

IMT Analytics AG

RS-232 16

M
Measurement data 34
Measurement parameters 39, 45
Measurements 6
Measurement setup 27
Mechanical connectors 11
Meteorological readings 45
MicroSD 16
Monitoring option 32

S
Safety instructions 7
Service life 7
Servicing 35
Servicing operations 35
Settings 20
Spare parts 36
Specifications 39
Start-up 9
Switching the device on/off 18
Symbol explanation 8

Appendix

T
Trigger 43
Trigger signal 24

U
Units 45
USB port 16
User controls 19

V
Ventilation parameters 6

W
Web server 31

Z
Zero point 25

IMT Analytics AG

305.081.000_04, 2018-07
Subject to changes without notice.

IMT Analytics . Gewerbestrasse 8 . 9470 Buchs . Switzerland
T +41 81 750 67 10 . www.imtanalytics.com

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