Sierra Monitor Corporation Gas Sensor Modules 4101 Users Manual 4101XX DS

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Model 4101 Series
Gas Sensor Modules

The Model 4101 Series Gas Sensor Modules
feature accurate detection of the specified
gas with linear 4-20 mA output.

The Sierra Monitor Model 4101 Series provides the user
with the features needed in a stand-alone, fixed-point
hazardous gas monitor system. Utilizing catalytic bead
sensor for combustible gas and electrochemical sensor
technology for the oxygen and toxic gas sensors, the Model
4101 provides accurate monitoring of hazardous gas
conditions. Proven sensor design matched with reliable
state-of-the-art electronics results in the ideal complete
single channel package to protect your plant and personnel.
Automatic Low Sensitivity Check
Monitoring integrity is ensured with the automatic low
sensitivity check. After calibration, a sensor sensivity
check confirms that the sensor response to gas is sufficient
to provide reliable operation without false indication. If the
sensor has low sensitivity, an LED lights to indicate that
sensor replacement is due.
False Alarm Avoidance
During Power-Up and Calibration, the transmitter output is
locked at 4 mA (except Oxygen sensor modules). The
output remains locked for five minutes directly after power
is applied or after calibration gas is removed, allowing
sufficient time to fully stabilize before coming on-line. This
avoids erroneous readings during warm-up and prevents
alarm caused by calibration gas.

4101-02

Convenient Diagnostic Measurements
Critical measurements are made at convenient jacks for a
Volt Ohm Meter. Each measurement location is clearly
marked. All modules have a signal output adjustment.
Simple Zero and Span Adjustments
Easily accessible potentiometers enable calibration
adjustments to be made in minutes by non-technical
personnel for reduced maintenance cost.
Flexible Alarm and Logging Options
The analog gas sensor modules can be used as part of a
facility gas risk management plan. The 4-20 mA output
signal is ideally suited to interface with a wide range of
instrumentation for alarm annunciation and recording.
The sensor module is housed in a NEMA-7 enclosure rated
for Class 1, Division 1, Groups C, D environments. An
optional NEMA 4 Group B enclosure is available.

4101-04 - 22/27

Sierra Monitor Corp. 1991 Tarob Ct., Milpitas, CA 95035, USA, 408-262-6611, 800-727-4377, FAX: 408-262-9042
Web Site: http://www.sierramonitor.com
E-Mail: sierra@sierramonitor.com

0504

Gas Sensor Modules
Specifications
Gas Type

Model

Combustibles
Oxygen
Carbon Monoxide
Hydrogen Sulfide
Chlorine
Sulfur Dioxide
Nitrogen Dioxide
Carbon Monoxide 4
Carbon Monoxide
Nitric Oxide
Hydrogen Chloride
Hydrogen Cyanide
Ammonia
Hydrogen Fluoride
Ethylene Oxide

Notes:

(1)
(2)
(3)
(4)
(5)

Sensor

4101-02 Catalytic
4101-03EL EC
4101-04 EC
4101-05 EC
4101-06 EC
4101-10 EC
4101-12 EC
4101-13 EC
4101-16
EC
4101-19 EC
4101-21 EC
4101-22 EC
4101-25 EC
4101-26 EC
4101-27 EC

Range Units

Resolution Response Sensor
Time (1) Life (2)
0-100
%LEL +/-3% F.S. (3)
3 Yrs
0-25
% Vol +/-0.1%
<10 sec. 2 Yr
0-500
PPM 1.0 PPM
<25 sec 2 Yrs
0-100
PPM 0.1 PPM
<30 sec 2 Yrs
0-10
PPM 0.1 PPM
<60 sec 2 Yrs
0-100
PPM 0.5 PPM
<20 sec 2 Yrs
0-20
PPM 0.2 PPM
<35 sec 2 Yrs
0-1000 PPM 0.5 PPM
<35 sec 2 Yrs
0-2000 PPM 0.1 PPM
<35 sec 2 Yrs
0-20
PPM 0.5 PPM
<15 sec 3 Yrs
0-20
PPM 0.1 PPM
<100 sec 2 Yrs
0-20
PPM 0.1 PPM
<70 sec 2 Yrs
0-50
PPM 1.0 PPM
<30 sec (5)
0-10
PPM 1.0 PPM
<30 sec (5)
0-20
PPM 0.1 PPM
<90 sec 2 Yrs

Operating Range
o
F
C
RH
-40 to 167 -40 to 75 10 - 95%
5 to 122
-15 to 50 5 - 99%
-4 to 122 -20 to 50 15 – 90%
-40 to 122 -40 to 50 15 – 90%
-4 to 122 -20 to 50 15 – 90%
-4 to 122 -20 to 50 15 – 90%
-4 to 122 -20 to 50 15 – 90%
-4 to 122 -20 to 50 15 – 90%
-4 to 122 -20 to 50 15 – 90%
-4 to 122 -20 to 50 15 – 90%
-4 to 122 -20 to 50 15 – 90%
-4 to 122 -20 to 50 15 – 90%
14 to 113 -10 to 45 20 – 95%
14 to 113 -10 to 45 20 – 95%
-4 to 122 -20 to 50 15 – 90%
o

Response time to 90% full signal value for applied concentration
Sensor life typical for use at standard temperature and pressure with occasional exposure to gas of interest
Step to 50% LEL within 10 seconds. Recovery to 10% LEL within 30 seconds
Hydrogen tolerent
Diffusion via membrane. Requires electrolyte and membrane replacement every 6 months.
Construction

Electrical Data
Loop Type

3 wire

Modules

Loop Resistance

800 Ohm with 28VDC

4101-02

400 Ohms at 21 VDC (4101-02)
Input Voltage DC

14-30 VDC (20-30VDC 4101-02)

Input Current

40 mA (80 mA 4101-02)

Input Power Max

1.4W (2.3W 4101-02)

Signal Output

4-20 mA DC linear (trouble 0 mA)

Operating Pressure

4101-03EL

Dimensions

Weight

H: 7.5", D: 4.0", W: 4.0"

2.0 lb

(21.6 x 10.2 x 10.2 cm)

(0.9 Kg)

H: 8.5", D: 4.0", W: 4.0"

2.1 lb

(21.6 x 10.2 x 10.2 cm)

(1.0 Kg)

4101-04-27 H: 8.0", D: 4.5", W: 4.0"

2.7 lb

(20.3 x 15.2 x 15.2 cm)

(1.3 Kg)

4101-25/26 H: 10.2", D: 6.0", W: 6.0"

+10% (variation from ambient)

2.7 lb

(25.9 x 15.2 x 15.2 cm)

(1.3 Kg)

Cross Sensitivity Data
Model
Number
4101-04
4101-05

Gas
type
CO
H2S

4101-06
4101-10
4101-12
4101-13
4101-16
4101-19
4101-21
4101-22
4101-27

Cl2
SO2
NO2
CO
CO
NO
HCl
HCN
C2H4O
(ETO)

CO
100

H2S
5

<2
100
0
<-10
<1
0
0
-20
100
350
100
0
0
35
0
75
<0.5
Ethanol
Toluene
Methyl-ethyl-ketone
Carbon Monoxide

Reading from 100 PPM of interfering gas
Cl2
H2
SO2
NO2
NO
0
<20
0
0
6
-20
100
-40
90
0
0
0
-10
-50
55
20
10
40

<0.1
0
0
0
<60
0
0
0
0

<15
0
100
0
60
0
5
35
160

-15
105
-100
100
-60
0
25
-2
-190

0
0
0
0
25
0
100
0
-5

HCl
0

HCN
0

C2H4
<50

0
0
0
0
0
0
15
100

0
0
15
-3
0
0
0
-8
100

0
0
0
0
<75
35
0
0
<1

4101-02 Combustible Gas Sensor
is FM Approved
05/04

Sierra Monitor Corp. 1991 Tarob Ct., Milpitas, CA 95035, USA, 408-262-6611, 800-727-4377, FAX: 408-262-9042
Web Site: http://www.sierramonitor.com
E-Mail: sierra@sierramonitor.com
© 2004 by Sierra Monitor Corporation



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