Products
CO Sensor
Performance
The gas-sensitive material used in the MQ-K7B gas sensor is tin dioxide (SnO2) with low conductivity in clean air. The high and low temperature cycle detection method is used to detect carbon monoxide at low temperature (1.5V heating). The conductivity of the sensor increases with the increase of carbon monoxide gas concentration in the air. High temperature (5.0V heating) cleans the gas adsorbed at low temperature. A simple circuit can be used to convert the change in conductivity into an output signal corresponding to the gas concentration.
Technical 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 |
Basic circuit
Description: The figure above is the basic test circuit of the MQ-K7B sensor. The sensor needs to apply 2 voltages: heater voltage (VH) and test voltage (VC). VH is used to provide a specific operating temperature for the sensor. It can be powered by a DC power supply or an AC power supply. This model requires that VH be in a low voltage state of 1.5V±0.1V when the sensor detects carbon monoxide, and in a 5V±0.1V state when it is not in the detection state (recovery stage). VRL is the voltage on the load resistor (RL) connected in series with the sensor. VC is the voltage provided for the test of the load resistor RL, and a DC power supply must be used.
Storage time and corresponding aging time
| Storage time | Recommended aging time |
| Under 1 month | no less than 48 hours |
| 1-6 months | no less than 72 hours |
| over 6 months | no less than 168 hours |
TenSensor, China's first listed gas sensor company,Tensensor can provide more than 100 varieties of six series including：
semiconductor gas sensor
electrochemical gas sensor
infrared gas sensor
dust sensor
pyroelectric sensor
thermopile sensor, etc.
which can be used for more than 200 kinds of gas and infrared, dust and other indicators detection, widely used in the field of security for detecting gas leakage, noxious gas leakage, smog and fire, the field of family, office and factory for detecting HCHO, VOC, CO2, PM2.5 and so on.
Moreover, the solutions for security, household electrical appliances, consumer electronics, smart home, instruments and meters are available.
For more information about MQ-K7B sensor, please contact account manager.
TEL：0086-0351-5249552
Whatsapp：+86 18335818384
Email：[email protected]
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