Products
CO Sensor
for portable CO detector
Application:
Household carbon monoxide gas leak alarmsProduct characteristics:
Long lifeDescription
MQ-K7B gas sensor uses tin dioxide (SnO2), a gas-sensitive material with low conductivity in clean air. It employs a high-low temperature cycling detection method to detect carbon monoxide at low temperatures (1.5V heating). The sensor's conductivity increases with increasing carbon monoxide concentration in the air. High-temperature (5.0V heating) cleaning removes the gas adsorbed at low temperatures. A simple circuit converts the change in conductivity into an output signal corresponding to the gas concentration.
Specifications
Media | CO |
Sealing type | plastic sealing |
Testing range | 10-500ppm |
Loop voltage | Vc≤10V DC |
Heating pole voltage | Vh=5v±0.1 AC or DC(high temperature); Vh=1.5v±0.1 AC or DC (low temperature) |
Heating time | 60s±1s(high temperature); 90s±1s(low temperature) |
Load resistor | RL(adjustable) |
Heating resistor | 29Ω±3Ω(room temperature) |
Heating power | ≤900mW |
Sensitivity | Rs(in air)/ Rs(in 150ppm CO)≥5 |
Output voltage | Vs=2.5~4.3v(in 150ppm CO) |
Concentration slope | α≤0.6(R300ppm/R50ppm CO) |
Temperature and humidity | 20±2℃, 55%±5%RH |
Pre-heating time | >48h |
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