Raytek Mi Miniature Infrared Sensor Users Manual MI_MA_54301_ENG_RevF
MI Miniature Infrared Sensor to the manual b099b4de-05d2-4ce1-9d78-6674b5006fc2
2015-02-06
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MI
Miniature Infrared Sensor
Operating Instructions
Rev. F 04/2006
54301
Declaration of Conformity for the European Community
This instrument conforms to:
EMC:
IEC/EN 61326‐1
Safety:
EN 61010‐1:1993 / A2:1995
Contacts
Europe
Raytek GmbH
13127 Berlin, Germany
Blankenburger Str. 135
Tel: +49 30 478008 – 0
+49 30 478008 – 400
Fax: +49 30 4710251
USA
Raytek Corporation
CA 95061 – 1820, Santa Cruz
1201 Shaffer Rd. PO Box 1820
Tel: +1 831 458 – 1110 or
+1 800 227 – 8074
Fax: +1 831 458 – 1239
raytek@raytek.de
automation@raytek.com
United Kingdom
Tel: +44 1908 630800
Fax: +44 1908 630900
France
Tel: 0800 888 244
ukinfo@raytek.com
info@raytek.fr
Raytek China Company
Beijing, China
Tel: +86 10 6439 2255
Fax: +86 10 6437 0285
info@raytek.com.cn
Internet: http://www.raytek.com/
© Raytek Corporation.
Raytek, the Raytek Logo, and DataTemp are registered trademarks of Raytek Corporation.
All rights reserved. Specifications subject to change without notice.
WARRANTY
The manufacturer warrants this instrument to be free from defects in
material and workmanship under normal use and service for the
period of two years from date of purchase. This warranty extends
only to the original purchaser. This warranty shall not apply to fuses,
batteries, or any product that has been subject to misuse, neglect,
accident, or abnormal conditions of operation.
In the event of failure of a product covered by this warranty, the
manufacturer will repair the instrument when it is returned by the
purchaser, freight prepaid, to an authorized Service Facility within
the applicable warranty period, provided manufacturer’s
examination discloses to its satisfaction that the product was
defective. The manufacturer may, at its option, replace the product in
lieu of repair. With regard to any covered product returned within
the applicable warranty period, repairs or replacement will be made
without charge and with return freight paid by the manufacturer,
unless the failure was caused by misuse, neglect, accident, or
abnormal conditions of operation or storage, in which case repairs
will be billed at a reasonable cost. In such a case, an estimate will be
submitted before work is started, if requested.
THE FOREGOING WARRANTY IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING BUT
NOT LIMITED TO ANY IMPLIED WARRANTY OF
MERCHANTABILITY, FITNESS, OR ADEQUACY FOR ANY
PARTICULAR PURPOSE OR USE. THE MANUFACTURER
SHALL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL OR
CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT,
TORT, OR OTHERWISE.
T ABLE OF C ONTENTS
1 SAFETY INSTRUCTIONS............................................1
2 DESCRIPTION ...............................................................3
3 TECHNICAL DATA ......................................................4
3.1 MEASUREMENT SPECIFICATIONS ...............................4
3.2 OPTICAL SPECIFICATIONS ..........................................6
3.3 ELECTRICAL SPECIFICATIONS ....................................7
3.4 ENVIRONMENTAL SPECIFICATIONS ...........................8
3.5 DIMENSIONS ...............................................................9
3.6 SCOPE OF DELIVERY .................................................10
4 BASICS ...........................................................................11
4.1 MEASUREMENT OF INFRARED TEMPERATURE.........11
4.2 EMISSIVITY OF TARGET OBJECT ................................12
4.3 AMBIENT TEMPERATURE .........................................12
4.4 ATMOSPHERIC QUALITY ..........................................12
4.5 ELECTRICAL INTERFERENCE ....................................13
5 INSTALLATION ..........................................................14
5.1 POSITIONING ............................................................14
5.1.1 Distance to Object.............................................14
5.2 WIRING .....................................................................15
5.2.1 Sensor Head Cable ............................................15
5.2.2 Cable Preparations ............................................16
5.3 OUTPUTS ...................................................................18
5.3.1 Signal Output................................................... 19
5.3.2 Head Ambient Temp. / Alarm Output ............. 20
5.3.3 Thermocouple Output....................................... 22
5.4 INPUTS FTC.............................................................. 23
5.4.1 Emissivity Setting (analog controlled) ............. 24
5.4.2 Emissivity Setting (digital controlled) ............. 25
5.4.3 Ambient Background Temperature
Compensation ............................................................ 26
5.4.4 Trigger and Hold Function............................... 28
5.5 CONNECTING TO THE PC VIA RS232 ...................... 30
5.6 INSTALLING OF MULTIPLE SENSORS VIA RS485...... 31
6 OPERATION................................................................. 34
6.1 CONTROL PANEL ..................................................... 34
6.2 SETTING OF MODES .................................................. 35
6.3 SETTING THE OUTPUT JUMPER ................................ 35
6.4 POST PROCESSING .................................................... 38
6.4.1 Averaging ......................................................... 38
6.4.2 Peak Hold.......................................................... 40
6.4.3 Valley Hold ....................................................... 41
6.4.4 Advanced Peak Hold......................................... 42
6.4.5 Advanced Valley Hold ...................................... 43
6.4.6 Advanced Peak Hold with Averaging............... 43
6.4.7 Advanced Valley Hold with Averaging ............ 43
6.5 FACTORY DEFAULTS ................................................ 44
7 OPTIONS....................................................................... 45
8 ACCESSORIES .............................................................46
8.1 OVERVIEW ................................................................46
8.2 ADJUSTABLE MOUNTING BRACKET .........................48
8.3 FIXED MOUNTING BRACKET ....................................49
8.4 AIR PURGING JACKET...............................................50
8.5 AIR COOLING SYSTEM ..............................................52
8.6 RIGHT ANGLE MIRROR ............................................57
8.7 BOX LID ....................................................................58
8.8 PROTECTIVE WINDOW .............................................59
9 MAINTENANCE ..........................................................60
9.1 TROUBLESHOOTING MINOR PROBLEMS ..................60
9.2 FAIL‐SAFE OPERATION ............................................61
9.3 SENSING HEAD EXCHANGE .....................................63
10 SOFTWARE .................................................................65
11 PROGRAMMING GUIDE .......................................66
11.1 TRANSFER MODES ..................................................67
11.2 GENERAL COMMAND STRUCTURE ........................68
11.3 DEVICE INFORMATION ...........................................69
11.4 DEVICE SETUP ........................................................70
11.4.1 Temperature Calculation ................................70
11.4.2 Emissivity Setting and Alarm Set points .......70
11.4.3 Post Processing ...............................................72
11.5 DYNAMIC DATA .....................................................72
11.6 DEVICE CONTROL ..................................................73
11.6.1 Output for the Target Temperature ................73
11.6.2 Analog Output, Scaling ................................. 73
11.6.3 Alarm Output................................................. 73
11.6.4 Factory default values..................................... 73
11.6.5 Lock Mode....................................................... 74
11.6.6 Mode Setting for the Digital Input FTC3....... 74
11.6.7 Changing the Sensing Head Calibration Data74
11.6.8 Ambient Background Temperature
Compensation ............................................................ 74
11.7 MULTIPLE UNITS (MULTIDROP MODE, RS485) .... 76
11.8 COMMAND SET ...................................................... 77
12 APPENDIX................................................................... 81
12.1 DETERMINATION OF EMISSIVITY ........................... 81
12.2 TYPICAL EMISSIVITY VALUES ................................ 83
INDEX ............................................................................... 87
Safety Instructions
1 Safety Instructions
This document contains important information, which should be
kept at all times with the instrument during its operational life. Other
users of this instrument should be given these instructions with the
instrument. Eventual updates to this information must be added to
the original document. The instrument should only be operated by
trained personnel in accordance with these instructions and local
safety regulations.
Acceptable Operation
This instrument is intended only for the measurement of
temperature. The instrument is appropriate for continuous use. The
instrument operates reliably in demanding conditions, such as in
high environmental temperatures, as long as the documented
technical specifications for all instrument components are adhered to.
Compliance with the operating instructions is necessary to ensure the
expected results.
Unacceptable Operation
The instrument should not be used for medical diagnosis.
Replacement Parts and Accessories
Use only original parts and accessories approved by the
manufacturer. The use of other products can compromise the
operational safety and functionality of the instrument.
Instrument Disposal
Disposal of old instruments should be handled according to
professional and environmental regulations as electronic waste.
MI
1
Safety Instructions
Operating Instructions
The following symbols are used to highlight essential safety
information in the operation instructions:
Helpful information regarding the optimal use of the
instrument.
Warnings concerning operation to avoid instrument
damage.
Warnings concerning operation to avoid personal injury.
Pay particular attention to the following safety instructions.
Use in 110 / 230 VAC electrical systems can result in
electrical hazards and personal injury if not properly
protected. All instrument parts supplied by electricity must
be covered to prevent physical contact and other hazards at
all times.
2
MI
Description
2 Description
The miniature infrared sensors MI are noncontact infrared
temperature measurement systems. They accurately and repeat ably
measure the amount of energy emitted from an object and convert
that energy into a temperature signal.
The following outputs are available:
•
J‐Thermocouple
•
K‐Thermocouple
•
0 ‐ 5 Volt
•
0 ‐ 20 mA or 4 ‐ 20 mA
•
10 mV / °C head ambient temperature signal
•
RS232 interface
•
optional: RS485 interface
The sensing head is protected by a rugged IEC 529 (IP 65, NEMA‐4)
stainless steel housing, and is connected to the electronic box with a
1 m (3 ft) cable. Longer cables must be ordered as an option. The
electronic box is separated from the sensing head. This allows the
sensing head to be used in hot environments up to 180°C (356°F)
without cooling. The electronic box can only be used in ambient
temperatures up to 65°C (150°F).
MI will allow sensing heads to be interchanged by programming in
the unique calibration data associated with different heads. Take
special care for the sensing head calibration data printed on the cable!
MI
3
Technical Data
3 Technical Data
3.1 Measurement Specifications
Temperature Range
LT
‐40 to 600°C (‐40 to 1112°F)
for J‐Thermocouple: ‐25 to 600°C (‐13 to 1112°F)
Spectral Response
LT
8 to 14 μm
Response Time
All models
150 ms (95% response)
Accuracy
LT
LT
TC outputs
± 1% or ± 1°C (± 2°F) whichever is greater
± 2°C (± 4°F) for target temp. < 20°C (68°F)
± 1% or ± 2.5°C (± 5°F) whichever is greater
At ambient temperature 23°C ±5°C (73°F ±9°F)
Repeatability
All models
4
± 0.5% or ± 0.5°C (± 1°F) whichever is greater
MI
Technical Data
Temperature Resolution
LT
± 0.1 K (± 0.2°F)*
± 0.25 K (± 0.5°F)**
* For a zoomed temperature span of 300°C (600°F)
** For the full temperature range of the unit
Temperature Coefficient
MIC
± 0.05 K per K or ± 0,05% / K whichever is
greater, at ambient: 23 to 125°C (73 to 185°F)
MIH
± 0.05 K per K or ± 0,05% / K whichever is
greater, at ambient: 23 to 180°C (73 to 356°F)
MIC, MIH
± 0.1 K per K or ± 0.1% per K whichever is
greater, at ambient: 0 to 23°C (32 to 73°F)
MID
± 0.15 K per K or ± 0.15% per K whichever is
greater, at ambient: 0 to 85°C (32 to 185°F)
Box
± 0.1 K per K or ± 0.1% per K whichever is
greater
Thermal Shock (within 20 min.)
LT
± 3.5 K at ΔT ambient = 25 K (45°F)
at target temperature of 50°C (45°F)
Emissivity
All models
0.100 to 1.100
Transmission
All models
0.100 to 1.000
MI
5
Technical Data
3.2 Optical Specifications
Optical Resolution D:S
MID, MIC; MIH
22:1 (typ.), 21:1 (guaranteed)
MID, MIC; MIH
10:1
MID, MIC
2:1
At 90% energy in minimum and distance 400 mm (15.7 in.)
Figure 1: Spot Size Chart
6
MI
Technical Data
3.3 Electrical Specifications
Power Supply
Voltage
Current
12 to 26 VDC
100 mA
Outputs
1. Output (OUT) 0 to 20 mA, or
4 to 20 mA, or
0 to 5 V, or
Thermocouple (J or K)
2. Output (AMB) 0 to 5 V output for head ambient temperature
(0 to 500°C, 32 to 932°F) or output for alarm
relay (software enabled, only in conjunction
with RS232/485)
mA Output
recommended loop impedance see Figure 9 on
page 19.
0 to 5 V Outputs min. load impedance 100 kΩ (a lower load
impedance deteriorates the accuracy)
output impedance 100 Ω
short circuit resistant
Thermocouple output impedance 20 Ω
short circuit resistant
MI
7
Technical Data
3.4 Environmental Specifications
Ambient Temperature
MIH sensing head
MIC sensing head
MID sensing head
MID with air cooling
Electronics box
0 to 180°C (32 to 356°F)
0 to 125°C (32 to 257°F)
0 to 85°C (32 to 185°F)
‐18 to 200°C (0 to 392°F)
0 to 65°C (32 to 150°F)
Storage Temperature
‐10 to 85°C (14 to 185°F)
Rating (Head)
IP 65 (NEMA‐4), not for models with an
optical resolution of 2:1
Rating (Box)
IP 65 (NEMA‐4)
Relative Humidity
10% to 95% non‐condensing
EMC
IEC 61326‐1
max. cable length 3 m (118 in.)
Vibration (Head)
IEC 60068‐2‐6: 2 G, 10 to 150 Hz, 3 axes
Shock (Head)
IEC 60068‐2‐27: 50 G, 11 ms, 3 axes
Weight (Head)
50 g (2 oz.) with 1 m cable, stainless steel
Weight (Box)
270 g (10 oz.), die‐cast zinc
Head Cable Material
MID/MIC
MIH
PUR (Polyurethane), Halogen free,
Silicone free
Teflon®
Teflon develops poisonous gasses when it comes into
contact with flames!
8
MI
Technical Data
3.5 Dimensions
Standard cable length
1 m (3 ft.)
MID/MIC: Ø 5 mm (0.2 in)
MIH: Ø 3 mm (0.12 in)
Figure 2: Dimensions of Sensing Head
2 mounting holes,
Ø 4.5 mm (0.17 in)
MI
9
Technical Data
Figure 3: Dimensions of Electronic Box
3.6 Scope of Delivery
The scope of delivery includes the following:
•
Sensing head
•
1 m head cable
•
Mounting nut
•
Electronic box
•
Operating instructions
10
MI
Basics
4 Basics
4.1 Measurement of Infrared Temperature
All surfaces emit infrared radiation The intensity of this infrared
radiation changes according to the temperature of the object.
Depending on the material and surface properties, the emitted
radiation lies in a wavelength spectrum of approximately 1 to 20 μm.
The intensity of the infrared radiation (”heat radiation”) is dependent
on the material. For many substances this material‐dependent
constant is known. This constant is referred to as the ”emissivity
value”.
Infrared thermometers are optical‐electronic sensors. These sensors
are sensitive to the emitted radiation. Infrared thermometers are
made up of a lens, a spectral filter, a sensor, and an electronic signal
processing unit. The task of the spectral filter is to select the
wavelength spectrum of interest. The sensor converts the infrared
radiation into an electrical signal. The signal processing electronics
analyze the electrical signals and convert it into a temperature
measurement. As the intensity of the emitted infrared radiation is
dependent on the material, the required emissivity can be selected on
the sensor.
The biggest advantage of the infrared thermometer is its ability to
measure temperature without touching an object. Consequently,
surface temperatures of moving or hard to reach objects can easily be
measured.
MI
11
Basics
4.2 Emissivity of Target Object
To determine the emissivity of the target object refer to section 12.1
Determination of Emissivity on page 81. If emissivity is low,
measured results could be falsified by interfering infrared radiation
from background objects (such as heating systems, flames, fireclay
bricks, etc. close beside or behind the target object). This type of
problem can occur when measuring reflective surfaces and very thin
materials such as plastic films and glass.
This measurement error can be reduced to a minimum if particular
care is taken during installation, and the sensing head is shielded
from these reflecting radiation sources.
4.3 Ambient Temperature
The sensing head was developed for the following ambient
temperature ranges:
• MIH: 0 to 180°C (32 to 356°F)
• MIC: 0 to 125°C (32 to 257°F)
• MID: 0 to 85°C (32 to 185°F)
The MID can operate in ambient temperatures up to 200°C (392°F)
with the air‐cooling accessory.
4.4 Atmospheric Quality
If the lens gets dirty, infrared energy will be blocked and the
instrument will not measure accurately. It is good practice to always
keep the lens clean. The Air Purge Jacket helps keep contaminants
from building up on the lens. If you use air purging, make sure a
filtered air supply with clean dry air at the correct air pressure is
installed before proceeding with the sensor installation.
12
MI
Basics
4.5 Electrical Interference
To minimize electrical or electromagnetic interference or “noise” be
aware of the following:
• Mount the unit as far away as possible from potential sources
of electrical interference such as motorized equipment
producing large step load changes.
• Use shielded wire for all input and output connections.
• Make sure the shield wires are earth grounded at one point.
• Sensor head shield braid should make direct contact around
the cable circumference.
MI
13
Installation
5 Installation
5.1 Positioning
Sensor location depends on the application. Before deciding on a
location, you need to be aware of the ambient temperature of the
location, the atmospheric quality of the location, and the possible
electromagnetic interference in that location, according to the sections
described above. If you plan to use air purging, you need to have an
air connection available. Wiring and conduit runs must be
considered, including computer wiring and connections, if used.
5.1.1 Distance to Object
The desired spot size on the target will determine the maximum
measurement distance. To avoid erroneous readings the target spot
size must completely fill the entire field of view of the sensor.
Consequently, the sensor must be positioned so the field of view is
the same as or smaller than the desired target size. For a list
indicating the available optics, see section 3.2 Optical Specifications
on page 6.
The actual spot size for any distance can be calculated by using the
following formula. Divide the distance D by your model’s D:S
number. For example, for a unit with D:S = 10:1, if the sensor is
400 mm (15.7 in.) from the target, divide 400 by 10 (15.7 by 10), which
gives you a target spot size of approximately 40 mm (1.57 in.).
14
MI
Installation
best
good
incorrect
Sensor
Target greater than spot size
Target equal to spot size
Target smaller than spot size
Figure 4: Proper Sensor Placement
5.2 Wiring
5.2.1 Sensor Head Cable
The manufacturer preinstall’s the sensor head cable between sensor
head and electronic box. It may be shortened but not lengthened.
Shortening the cable length by 1 m (3 ft.) causes a
temperature error of – 0.1 K / m!
Do not bend the sensor head cable tighter than 25 mm / 1 in.
(MID/MIC) and 15 mm / 0.6 in. (MIH) respectively!
MI
15
Installation
5.2.2 Cable for Power Supply and Outputs
You need to connect the power supply (12 to 26 VDC) and the signal
output wires. Use only cable with outside diameter from 4 to 6 mm
(0.16 to 0.24 in), AWG 24.
The cable must include shielded wires. It should not be
used as a strain relief!
1. Cut about 40 mm (1.5 in) of the cable sheath (7) from the end
of the cable. Caution: Do not cut into the shield!
2. Cut the shield (5) so about 5 mm (0.2 in) remains exposed
from under the cable sheath (7). Separate the shield and
spread the strands out. Shorten the inside insulation until
you can separate the wires (6).
3. Strip 3 mm (0.15 in) of insulation from the wires (6).
Figure 5: Cable Preparation
4. Open the electronic box by removing the four Phillips head
screws and pulling off the lid. Unscrew the cap (1), and
remove the plastic compression fitting (2), the rubber washer
(3), which is inside the fitting, and the two metal washers (4).
16
MI
Installation
Preinstalled cable
to sensor head
Output signal and
power connector block
Cable that has to be
installed by the user
Figure 6: Connecting of Cables to the Electronic Box
5. Put the following on the cable (as shown in the figure above):
the cap (1), the plastic compression fitting (2), the rubber
washer (3) and one of the metal washers (4).
6. Spread the cable shield (5) and then slip the second metal
washer (4) on the cable. Note that the shield must make good
contact to both metal washers.
7. Slip the wires (6) into the electronic box far enough to
connect to the power and output terminals.
8. Screw the cap (1) into the electronics box. Tighten snuggly.
Do not over tighten.
9. Connect the wires (6) to the power and output terminals on
the printed circuit board.
MI
17
Installation
5.3 Outputs
Electronic Box
J or K
Signal Output
4 to 20 mA
0 to 5 V 0 to 20 mA
Head Ambient Temp.
or Alarm
0 to 5 V
Power
12 to 26 VDC
Figure 7: Signal Outputs and Power Supply
18
MI
Installation
5.3.1 Signal Output
Power +
Power –
Signal Signal
Ground Output
Figure 8: Wiring of the Signal Output (mA or V)
Max. Loop Impedance [Ω]
The signal output can be configured either as current or as voltage
output.
The minimum load impedance for the 0 to 5 V output must be
100 kΩ.
The maximum current loop impedance for the 0/4 to 20 mA output
can be 500 Ω, and the power supply and loop impedance must be
matched as shown below.
Max. Loop Impedance
Power
Supply
[V]
Figure 9: Max. Loop Impedance depending on Power Supply
MI
19
Installation
5.3.2 Head Ambient Temp. / Alarm Output
This output can be configured either as output for the head ambient
temperature (default configuration) or as an alarm output.
Power +
Power –
Ground
Head Ambient Temp.
Figure 10: Wiring the Output for Head Ambient Temperature
The output range for the head ambient temperature is 0 to 500°C
(32 to 932°F) with 10 mV /°C.
In case of an alarm the output switches between 0 V and 5 V. The
alarm output is controlled by the target temperature or the sensing
head temperature.
Power + Power -
Figure 11: Wiring of the Alarm Output
20
MI
Installation
You may use a solid state relay for the alarm output. The output is
short circuit resistant with 100 Ω output impedance.
The alarm output is only enabled through the DataTemp MultiDrop
software, see the software help for set up instructions.
MI
21
Installation
5.3.3 Thermocouple Output
If you are using a J‐ or K‐ thermocouple you must install a
compensation cable. The cable is available as an accessory
(XXXCI1CB25 for Type J, XXXCI2CB25 for Type K) with a cable
length of 7.5 m (24.6 ft.)
Connect the wires according to the following table:
J-Thermocouple
Power Supply
+
–
+
–
white red-white red-yellow yellow
Table 1: Wiring the Thermocouple J Compensation Cable
K-Thermocouple
Power Supply
+
–
+
–
yellow red-yellow red-white white
Table 2: Wiring the Thermocouple K Compensation Cable
Power +
red-yellow
Power – TC J – TC J +
yellow red-white white
Figure 12: Wiring the Thermocouple J Compensation Cable
22
MI
Installation
5.4 Inputs FTC
The three inputs FTC1, FTC2, and FTC3 are used for the external
control of the unit.
All input functions are enabled through the DataTemp
MultiDrop software only, see the software help for
complete set up instructions!
Emissivity (analog control)
Emissivity (digital control)
Ambient Background Temperature Compensation
Trigger
Hold Function
FTC1 FTC2 FTC3
x
x
x
x
x
x
x
Table 3: Overview to the FTC Inputs
Figure 13: FTC Inputs on the Electronic Board
MI
23
Installation
5.4.1 Emissivity Setting (analog controlled)
The input FTC1 can be configured to accept an analog voltage signal
(0 to 5 VDC) to provide real time emissivity setting. The following
table shows the relationship between input voltage and emissivity.
U in V
0.0
0.5
…
4.5
5.0
Emissivity
0.1
0.2
…
1.0
1.1
Table 4: Ratio between Analog Input Voltage and Emissivity
Example:
The process requires the setting of emissivity:
• for product 1: 0.90
• for product 2: 0.40
Following the scheme below, the operator needs only to switch to
position “product 1” or “product 2”.
+ 5 VDC
“product 1”
R1 = 200 Ω
4.0 V (ε=0.9)
To the input FTC1
of the sensor
R2 = 500 Ω
1.5 V (ε=0.4)
R3 = 300 Ω
“product 2”
Figure 14: Adjustment of Emissivity at Input FTC1 (Example)
24
MI
Installation
5.4.2 Emissivity Setting (digital controlled)
The sensor’s electronics contains a table with 8 pre‐installed settings
for emissivity. To activate these emissivity settings, you need to have
the inputs FTC1, FTC2, and FTC3 connected. According to the
voltage level on the FTC inputs, one of the table entries will be
activated.
0 = Low signal (0 V)
1 = High signal (5 V)
A non‐wired input is considered as “High”!
Table entry Emissivity FTC3 FTC2 FTC1
(Examples)
0
1
2
3
4
5
6
7
1.100
0.500
0.600
0.700
0.800
0.970
1.000
0.950
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Figure 15: Digital Selection of Emissivity with FTC Inputs
The values in the table can only be changed by means of the
DataTemp MultiDrop software.
MI
25
Installation
5.4.3 Ambient Background Temperature Compensation
The sensor is capable of improving the accuracy of target
temperature measurements by taking into account the ambient or
background temperature. This feature is useful when the target
emissivity is below 1.0 and the background temperature is
significantly hotter than the target temperature. For instance, the
higher temperature of a furnace wall could lead to hotter
temperatures being measured especially for low emissivity targets.
Ambient background temperature compensation compensates for the
impact of the reflected radiation in accordance to the reflective
behavior of the target. Due to the surface structure of the target, some
amount of ambient radiation will be reflected and therefore added to
the thermal radiation that is collected by the sensor. The ambient
background temperature compensation compensates the final result
by subtracting the amount of ambient radiation measured from the
sum of thermal radiation the sensor is exposed to.
The ambient background temperature compensation
should always be activated in case of low emissivity
targets measured in hot environments or when heat
sources are near the target!
Three possibilities for ambient background temperature
compensation are available:
• The internal sensor head temperature is utilized for
compensation assuming that the ambient background
temperature is more or less represented by the internal sensor
head temperature. This is the default setting.
• If the background ambient temperature is known and constant,
the user may give the known ambient temperature as a constant
temperature value.
26
MI
Installation
• Ambient background temperature compensation from a second
temperature sensor (infrared or contact temperature sensor)
ensures extremely accurate results. For example, the output of
the second unit, set for mV output, could be connected to the
FTC2 analog input (0 to 5 VDC corresponding to low end and
high end of temperature range) is utilized for real time
compensation, whereby both sensors must be set on the same
temperature range.
Sensor 2
targeted
to ambient
Furnace wall
0 – 5 VDC
analog output
at FTC2 input
Sensor 1
targeted
to object
Thermal radiation
of ambient
Thermal radiation
of target
Target object
Figure 16: Principle of Ambient Background Temperature
Compensation
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Installation
5.4.4 Trigger and Hold Function
The FTC3 input can be used as external trigger in conjunction with
the software trigger mode setting “Trigger” or “Hold”.
External switch:
- contact relay,
- transistor,
- TTL gate, …
Figure 17: Wiring of FTC3 as External Input
Trigger: A logical low signal at the input FTC3 will reset the peak or
valley hold function. As long as the input is kept at logical low level
the software will transfer the actual object temperatures toward the
output. At the next logical high level, the hold function will be
restarted.
Temp
object temperature
output temperature
FTC3
Time
Figure 18: FTC3 for Resetting the Peak Hold Function
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Installation
Hold: This mode acts as external generated hold function. A
transition at the input FTC3 from logical high level toward logical
low level will transfer the current temperature toward the output.
This temperature will be written to the output until a new transition
from high to low occurs at the input FTC3.
Temp
object temperature
output temperature
Trigger
Time
Figure 19: FTC3 for Holding the Output Temperature
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Installation
5.5 Connecting to the PC via RS232
The RS232 interface comes with each model. Connect a single unit
with a RS232 COM port by using the connection kit RAYMISCON.
to the computer’s COM port
2 3
5
Transfer Mode:
• 9600 kBit/s
• 8 data bits
• 1 stop bit
• no parity
• no flow control
Sub-D 9 pin
Figure 20: Connecting the RS232 cable
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MI
Installation
5.6 Installing of Multiple Sensors via RS485
The distance between the sensor and a computer can be up to 1200 m
(4000 ft.) via RS485 interface. This allows ample distance from the
harsh environment where the sensing head is mounted to a control
room or pulpit where the computer is located.
The RS232/485 adapter comes with a power supply:
RAYMINCONV2 for 230 VAC
RAYMINCONV1 for 110 VAC
Connect the signal line as shown:
RS232/485 Adapter
RxB
Æ
RxA
Æ
Electronic Box
B
A
Do not run power supply in the same conduit as the
RxA/RxB wires!
Shunt deactivated!
Figure 21: Wiring the RS485 Interface
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Installation
For an installation of two or more sensors in a RS485 network, each
sensor is wired parallel to the others.
You may connect up to 32 units. Make sure to deactivate the preset
shunt resistor for all units except for the last one. The position of the
switch to deactivate the shunt you can see on the electronic board in
the figure above.
Before units are in a network the multidrop address needs
to be defined. Each sensor must have a unique address!
The following figure illustrates the wiring of sensors in a multidrop
installation.
B
RxB
A last unit
RxA
with shunt
B A
B A
B A
activated!
RS232/485
Adapter
unit 1
unit 2
unit
before
last
Figure 22: Wiring the RS485 Network
The address setting can be done either through buttons or through
software alternatively.
Addressing through Buttons
Press the button until “M” becomes
visible. Use the and buttons
until the requested address appears. Press the
button to acknowledge your selection.
Addressing through Software
Alternatively the sensor can be controlled by means of the optional
available software DataTemp MultiDrop.
32
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Installation
Go to the menu , and then select the register
. Use for selecting the requested
address.
Figure 23: Address Setting
Step‐by‐step instructions for addressing RS‐485 MI units:
1. Power the unit.
2. Using either the buttons or software, assign unique address
to the sensor.
3. Power down the unit.
4. Repeat until all sensors have a unique address.
5. On the last unit in the network, activate the shunt resistor
after the unit has been powered down.
Failure to use shielded RS‐485 wire or activation of the
shunt resistor when the unit is powered, can result in
damage to the electronics!
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Operation
6 Operation
Once you have the sensor positioned and connected properly, the
system is ready for continuous operation.
The operation of the sensor can be done by means of the built‐in
control panel on the sensor’s electronic board or by means of the
software that came with your sensor optionally.
6.1 Control Panel
The sensor is equipped with a control panel in the sensor’s electronic
housing, which has setting/controlling buttons and an LCD display.
The actual function mode is shown on the display with a specific
mode symbol.
Output Jumper
Mode Symbol
Value
Mode Button
Value Buttons
Figure 24: Control Panel
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Operation
6.2 Setting the Output Jumper
In addition to the set mode in the
unit, see section 6.3 Setting of
Modes, on page 36, the unit’s
outputs must be configured by
switching the
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