MQ-K7B Semiconductor CO Sensor

for portable CO detector

Application:

For CO leak alarm, portable CO detector.

Product characteristics:

Long life
Be stable
good sensitivity
low cost, simple drive circuit

1. Performance

MQ-K7B is sensitive to CO.

2. Appearance and dimension

3. 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