Miniature Infrared CO2 Sensor Module - S8-4B

- Measurement range: 400 to 32000ppm
- Accuracy: ±1000ppm at alarm points between 7000 and 9000 ppm
- Measurement interval: 30 seconds
- Operating temperature: -5 to 60 ºC
- Operating humidity range: 0 to 95% RH non condensed
- LNE approved
- Miniature size
- Low power consumption
- Individually calibrated

  • Model Number: S8-4B
  • Data Sheet: Date Sheet File
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  • Miniature Infrared CO2 Sensor Module
  • Miniature Infrared CO2 Sensor Module
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Product Specification

S8-4B Miniature Infrared CO2 Sensor Module General Description
The S8-4B CO2 sensor module is designed to serve as a CO2 safety switch when built-in into kerosene heaters. The sensor utilizes reliable and highly accurate infrared gas sensing technology. The electronic circuitry is optimized for low power consumption. Because of low current consumption the sensor is suitable for battery applications and has an average current consumption of 2 mA.

S8 can be customized for a variety of alarm and control applications.

S8-4B Miniature Infrared CO2 Sensor Module  Key technical specification


S8-4B Article no. 004-0-0061

Target gas


Operating Principle

Non-dispersive infrared (NDIR)

Measurement range

400 to 32000ppm (represented internally in digital format)

Measurement interval

30 seconds


±1000ppm at alarm points between 7000 and 9000 ppm (Note 1)

Pressure dependence

+ 1.6 % reading per kPa deviation from normal pressure

Gas diffusion response time

2 minutes by 90%

Operating temperature

-5 to 60 ºC

Operating humidity range

0 to 95% RH non condensed

Storage temperature

-40 to +70°C

Storage Environment

0-95% RH non condensed non corrosive gases, no contamination to kerosene

Dimensions (mm)

61 x 20 x 8.5 mm (max dimensions)


< 10 grams

Power supply

4.5 to 7.0 VDC unprotected against surges and reverse connection

Power consumption

250 mA peak, 2 mA average

Life expectancy

5+ years in normal indoor / office environments

Compliance with

Tested according

Emission EN 61000-6-3:2007, EN 61000-6-4:2007

Immunity EN 61000-6-1:2007

RoHS directive 2011/65/EU

Output Alarm, Open Drain

Open drain FET; 7V/ 800mA, protected by a zener diode, normally

open, 100kWpull-up resistor to power (+).

8000/6500 (Alarm/Release) Normal state is open.

Transistor conducting at (CO2 > 8000ppm) OR (Unloaded Power

voltage < 4.5V) OR (Loaded Power voltage < 4.0V) OR (Sensor

Failure detected by self-diagnostics)


Forced calibration (assuming 400 ppm exposure).


Full self-diagnostics at power up and continuously running self-diagnostics 

at every measurement.

Note 1: Accuracy is specified over operating temperature range. Specification is referenced to certified calibration mixtures. Uncertainty of calibration gas mixtures (+-2% currently) is to be added to the specified accuracy for absolute measurements.

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