Target: CO2
Model: MG-812
Detection range: 0~ 10000ppm CO2
Detection principle: Semiconductor
Characteristics: Small sizes, low power-consumption, high sensitivity and good selectivity

MG-812 Manual download
Get Price Whatsapp


MG-812 is a semiconductor oxide chemical sensor that uses solid electrolyte battery principles to detect CO2.
When the sensor is kept at a certain working temperature and placed in a CO2 atmosphere, an electrode reaction occurs between the positive and negative electrodes of the battery, and the output signal voltage is inversely proportional to the logarithm of the CO2 concentration. A voltage change in the test signal can detect a change in the CO2 concentration.


CO2 detection in air quality control, ferment process control and green house fields.


  • Small sizes, low power-consumption, high sensitivity and good selectivity.
  • Less affection by temperature and humidity.
  • Good stability and repeatability.


Model No.        MG812
Standard pack        Metal shell
Target gas        CO2
Detection range 0~10000ppm CO2
Heater voltage VH 5.0±0.1 V
Heater resistance RH 60.0±5Ω
Heater current IH 85±10mA
Heater consumption PH 420±50mW
Working temp Tao -20~50℃
Storage temp -20~70℃
Zero EM F 200-400mV (in 400ppm CO2)
Output signal  △EM F ≧20mV EMF (40ppmCO2)- EMF (1000ppmCO2)

* 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.