Sierra Monitor Corporation 4100-33, 4100, 4100-35, 4100-36, 4100-34 User Manual

The Model 4100 Series Gas Sensor Modules
monitor a variety of toxic and combustible gases
and provide a 4-20 mA DC output signal of gas
concentration

The Model 4100 Series utilizes semiconductor sensor tech­nology to provide monitoring of gases in the parts per mil­lion (PPM) ranges. These modules operate on 24 VDC
input and have a non-linear 4-20 mA DC current loop out­put.

The four gas sensor modules in this series are:

Model 4100 Series

Gas Sensor Modules

4100-33 Gas Sensor Module 4-20 mA DC
4100-34 Gas Sensor Module 4-20 mA DC
4100-35 Gas Sensor Module 4-20 mA DC
4100-36 Gas Sensor Module 4-20 mA DC

These gas sensor modules can monitor a wide variety of
gases. Table A provides a partial list of gases that can be
reliably monitored. If your gas is not on this list, check
with Sierra Monitor to determine if a 4100 Series gas sen­sor module is available to meet your requirements.

Also, these gas sensor modules can be calibrated with
the gas of interest or with methane or carbon monoxide.
Thus, the user does not have to obtain a special calibra­tion gas.

The Model 4100 Series provides a non-linear 4-20 mA out­put signal that can interface with the Sierra Monitor Sensys
controller or other linearizing controllers / indicators. Curves
and linearizing equations can be provided for a specific
gas and sensor to enable the operation of these sensor
modules with other brand controllers.

Specifications

Sensor

Type: Solid State Metal Oxide Semiconductor
Range: 20-500 ppm or 50-5000 ppm See Table A.
Response: 80% of concentration in less than 3 mins.
Typical Life: 1-3 years in Normal Service.

Detectable Gases And Vapors

Typical List: See Table A

How it Works

Semiconductor sensors have a resistance in air that is
affected by oxygen adsorbed on the surface of the sensor.
Oxygen atoms capture electrons on the semiconductor
surface, thereby increasing its resistance.

The sensors can be impregnated with dopants such that
the sensors resistance changes when specific gases dis­place the adsorbed oxygen.

Nobel Metal Wire

Sensor

Heater Coil

Electrical Data

Wiring: 3 wire non-isolated
Input Voltage: 14 - 30 VDC
Current: 70mA @ 4mA DC loop current;

90mA @ 20mA DC loop current at 24VDC.
Power: 2.1 Watts
Output Range: 4-20mA DC Non-linear
Loop Res.: 800 ohms at 28VDC

Maintenance

Calibration
Adjustments: Zero Adjust, Span Adjust
Sensor LED: OFF indicates heater or film is an open circuit.

Environmental

Operating: Temperature -10oC to +40oC (14oF to 104oF)

Humidity 5% to 95% non-condensing

Storage: Temperature -55oC to +85oC (-67oF to 185oF)

Mechanical

Size: 6.75" x 4" x 3.5" (HxWxD)

(17.1 cm x 10.2 cm x 8.9 cm)
Material: Cast aluminum epoxy painted
Weight: 2 pounds (0.9 Kg)
Classification: Class I Division I Groups C,D

Mounting: Connects to a vertical 3/4" electrical conduit

Sierra Monitor Corporation 1991 Tarob Ct. Milpitas, CA 95035 [phone] 800-727-4377 FAX: [phone]

Visit our Web site at: www.sierramonitor.com E-Mail: [e-mail]

ORDERING INFORMATION

4100 Series Gas Sensor Modules

4100-33 Gas Sensor Module 4-20 mA DC
4100-34 Gas Sensor Module 4-20 mA DC
4100-35 Gas Sensor Module 4-20 mA DC
4100-36 Gas Sensor Module 4-20 mA DC

Spare Parts & Accessories

4200-33 Sensor Replacement Assy for 4100-33
4200-34 Sensor Replacement Assy for 4100-34
4200-35 Sensor Replacement Assy for 4100-35
4200-36 Sensor Replacement Assy for 4100-36
5311-00 Rainshield
SPM 28009 Assembly, Transmitter Electronics

Calibration Accessories

1200-26 Gas Sensor Calibrator w/2 gas cylinders
1290-03 Gas Cylinder - Methane 5000 ppm
1290-04 Gas Cylinder - Methane 1000 ppm
1290-05 Gas Cylinder - Carbon Monoxide 100 ppm

Table A: Gases and ranges for 4100 Series Gas Sensor Modules

GAS 500 PPM 5,000 PPM

FULL SCALE FULL SCALE

acetic acid 4100-34 4100-35
acetone 4100-34 4100-35
acetonitrile 4100-34 4100-35
acetylene 4100-34 4100-35
acrylonitrile 4100-34 4100-35
ammonia (<0oC) 4100-34
ammonia (>0oC) 4100-36
benzene 4100-34
1-butanol 4100-34
2-butanol 4100-34
i-butane 4100-34 4100-35
n-butane 4100-34 4100-35
1-butanol 4100-35
2-butanol 4100-35
i-butanol 4100-34 4100-35
t-butanol 4100-34 4100-35
butene 4100-34 4100-35
carbon monoxide 4100-34
chloroform 4100-34
cyclohexane 4100-34 4100-35
cyclopentane 4100-34 4100-35
diethylketone 4100-34 4100-35
dipropylether 4100-34 4100-35
ethane 4100-34 4100-35
ethanol 4100-34 4100-35
ethylene 4100-34 4100-35
n-heptane 4100-34 4100-35
n-hexane 4100-34 4100-35
1-hexanol 4100-34 4100-35

HUB FOR 3/4"

CONDUIT

4.50 IN

11.4c m

3.94 IN

DIA. (2X)

SENSOR
ASSEMBLY

.312 IN

0.8cm

10.0cm

GAS 500 PPM 5,000 PPM

FULL SCALE FULL SCALE

hexafluoropropylene 4100-34 4100-33
hydrogen 4100-34
methane 4100-35
methanol 4100-34 4100-35
methyl bromide 4100-34 4100-35
methyl chloride 4100-34 4100-35
methyl ethyl ketone 4100-34 4100-35
methyl propyl ketone 4100-34 4100-35
methylene chloride 4100-34
nitroethane 4100-34 4100-35
nitromethane 4100-34 4100-35
1-pentanol 4100-34 4100-35
propanal 4100-35
propane 4100-34
i-propanol 4100-34 4100-35
n-propanol 4100-34 4100-35
propylene 4100-34 4100-35
R-11 4100-33
R-12 4100-33
R-22 4100-33
R-113 4100-33
R-123 4100-33
R-134a 4100-33
R-141b 4100-33
R-142b 4100-33
R-500 4100-33
R-502 4100-33
toluene 4100-34
xylene 4100-34

5.30 IN

13.5cm

6.90 IN

17.5cm

Sierra Monitor Corporation 1991 Tarob Ct. Milpitas, CA 95035 [phone] 800-727-4377 FAX: [phone]

Visit our Web site at: www.sierramonitor.com E-Mail: [e-mail]

© 1996 Sierra Monitor Corporation