Infra-red Sensors

An infrared point sensor is a point gas detector based on the nondispersive infrared sensor technology. Designed for long-term continuous sensing of CO2 and for numerous hydrocarbon gases including vapours in fixed systems, IR sensors are most suited for portable instrumentation where shorter term usage is more usual. These are available with different Sensor Types like Infrared, Dual Wavelength with Ambient Temperature Range of (°C) : -40, 10, 60, and Supply voltage of DC (v) : 16, 20, 30.

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Detailed Description for Infra-red Sensors

A infrared point sensor is a point gas detector based on the nondispersive infrared sensor technology. The infra red sensor technology is diffusion based and Sulfur Hexafluoride specific, housed in a robust metallic enclosure and designed for one-person calibration. 



Dual source and dual receivers are used for self compensation of changes in alignment, light source intensity and component efficiency. The transmitted beams from two infrared sources are superimposed onto an internal beam splitter. 50% of the overlapping sample and reference signal is passed through the gas measuring path and reflected back onto the measuring detector. The presence of combustible gas will reduce the intensity of the sample beam and not the reference beam, with the difference between these two signals being proportional to the concentration of gas present in the measuring path. The other 50% of the overlapped signal passes through the beam splitter and onto the compensation detector. The compensation detector monitors the intensity of the two infrared sources and automatically compensates for any long term drift.

Sensor Type


Infrared, Dual Wavelength



Dual Range:

Default: 0-100% LEL Methane

User Setting: 0-100% by vol. Methane

Repeatability: +/- 1% LEL


+/- 1% for 0-50% LEL range

+/1 2% for 51-100% LEL range

Zero Drift: +/- 1% full scale per month @ 20 oC (68oF) ambient (max +/- 3% full scale per year)

Sensor Life: Typically >5 years

Heated Sensor: Heated cell to prevent condensation

Response Time: T90 < 10 sec*



Display: Fixed and scrolling LED

Signal Outputs: 

Sentry digital bus

Analog 4-20 mA Linear

3-wire Non-Isolated

4-wire Isolated

Serial RS-485 Modbus RTU

Relay: Optional




5 amp Alarm, Warning (0.25 amp Trouble)

5A @ 250 VAC, 5A @ 30 VDC (Alarm, Warning)

Board includes auxiliary connection for Sentry multiplexing

HART: Termination board includes HART, Modbus RS-485, 4-20mA, Digital Input, 2A Relay output, No Sentry bus

Remote Sensor: Up to 100 feet (30.4m)



Power consumption: 3 watts

Input voltage: 24 VDC nominal: 10-30 VDC

Operating Range


Ambient Temperature Range: -40o to 140oF (-40o to 60oC)

Relative Humidity: 0-99% Non-Condensing



Dimensions: (H x W x D) 

 A1 & A2: 7.8 x 5.7 x 3.9 in. (19.8 x 14.5 x 9.9 cm)

S1 & S2: 7.5 x 4.4 x 4.9 in. (19 x 11 x 12 cm)


A1 & A2: 3.4 lb. (1.5 Kg)

S1 & S2: 7.2 lb. (3.3 Kg)

Enclosure: Epoxy coated aluminum or 316 stainless steel

Housing: AL or SS (same as enclosure)

Hazardous Area Classification: 

Explosion proof, Class 1, Div. 1, Groups C, D

Class I, Zone 1

Group IIC, IP66, IP65, NEMA 4X, T6

TA = -40oC to 85oC II2 GD, Ex d IIC



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