| Price | $38 |
|---|---|
| Category | Sensors |
| Availability | In stock |
| Delivery | Shipped across Lebanon, or collect from the lab |
A genuine carbon-dioxide sensor rather than a general air-quality guess. The MG811 is an electrochemical cell whose output EMF falls as CO2 rises, covering roughly 350 to 10000 ppm, and it is far less bothered by humidity than a tin-oxide sensor. The module adds the amplifier the raw cell needs, giving a 0-2V analog output, a digital alarm output and a temperature-compensation pin. It wants a 6V supply for its 850 mW heater, and a long warm-up.
Key features
- True CO2 measurement, roughly 350-10000 ppm
- Electrochemical cell - little cross-sensitivity to humidity
- Analog 0-2V out (0-4V selectable) plus a digital alarm output
- Temperature-compensation pin (Tcm) brought out
- Needs a 6V supply for the heater, not 5V
- Long warm-up and calibration needed for accurate ppm
Details
Specifications
| Model | MG811 |
|---|---|
| Type | Solid-electrolyte electrochemical CO2 sensor on a breakout module |
| Detection range | 350 to 10000 ppm CO2 |
| Module supply | 6V DC |
| Heater voltage | 6.0V plus or minus 0.1V |
| Heater resistance | 35 ohms plus or minus 3 ohms |
| Heater current | 140 plus or minus 20 mA |
| Heater power | 850 plus or minus 120 mW |
| Sensor output | EMF falls as CO2 rises; ~30-50 mV across 350-10000 ppm |
| Module outputs | Analog 0-2V default (0-4V selectable) + digital threshold (LM393 + trim pot) + Tcm |
| Pins | Vcc, Dout, Aout, Gnd, Tcm |
| Dimensions | ~32 x 22 x 30 mm |
