Target: CO2
Model: RTGA71
Characteristics: TO-46 metal package,High sensitivity

RTGA71 Manual download
Get Price Whatsapp


RTGA71 sensor is a single-channel thermopile gas sensor, which contains a thermopile chip based on MEMS technology and connects hundreds of pairs of thermocouples in series, to convert the absorbed infrared radiation into a voltage signal. There is a narrow-band filter in the front of the sensor, and the sensor can be used for the detection of carbon dioxide concentration. The sensor NTC itself has temperature compensation, to improve the measurement accuracy.


  • NDIR (CO2) Gas Detection equipment
  • Indoor air quality detection and HVAC system control
  • CO2 gas control in industrial workshop
  • CO2 emission control of combustion furnace
  • Human breath detection
  • Interior air quality monitoring of automotive


  • TO-46 metal package
  • High sensitivity
  • Quick response, Good stability
  • High transmittance of narrowband filter
  • High precision NTC


Parameter Value Unit Remarks
Chip size 1.35×1.35  mm /
Field of view 95  Degree Above 50%
Filter center wavelength 4.26 um  
Thermopile resistor 76±10  25℃,1V
Noise voltage 38 nV/Hz1/2 25℃
Noise equivalent power 0.23  nW/Hz1/2 500K, 1Hz, 25℃
Response rate 160±40 V/W 500K, 1Hz, 25℃
Temperature coefficient of resistance 0.06 %/℃ 25℃~75℃
Time constant ≤13  ms  
ChipDetection rate 1.5 ×108  cmHz1/2/W 500K, 1Hz, 25℃
NTC resistance 100 ±1% 25℃
NTC(β) 3950 ± 1% / 25℃/50℃
Working temperature -30 ~ 125℃    

* The description and specifications might be changed without notice. Please contact us for the latest information before placing orders.

Technical Support:

Customized technical design and function, LOGO and package are available without extra charge (including molding fee) for mass volume.

The sensors don't have sleeping mode. It can be set in program if needed.

All Winsen products go through strict inspections and tests to make sure they are 100% qualified before shipping out.

The sensor has been fully tested (not calibrated) before leaving the factory. However, after transportation and storage, the environment conditions change, and the surface of the sensor absorbs moisture, mixed gas, pollution matters, etc. It is recommended that customers perform aging and calibration after sensors become stable according to the program and use occasions of the whole device.

15﹪-90﹪RH without condensation,greater or less than this range or long-term high temperature and high humidity will affect the life of the sensor.

Our sensors are certified with CE, 3C, ROHS, anti-explosion, fire prevention, and coal mining safety according to different applications. And we provide assistance for new certification.

Many factors can cause the sensor to fail such as broken wires in transportation, poisoning, falling off of the sensitive material, damage to the heating wire (device), etc. Please find specific cause in each category with Winsen’s aftersales.

Winsen provides professional consultation and service before and after sales. We will recommend the best fitting sensor for your demand. If you have any problem, don’t hesitate to email us to

Due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. But we will reply to your inquiry in 24 business hours.