MQ7 CO Carbon Monoxide Coal Gas Sensor detects the concentrations of CO in the air and outputs its reading as an analog voltage. The sensor can measure concentrations of 10 to 10,000 ppm. The sensor can operate at temperatures from -10 to 50°C and consumes less than 150 mA at 5 V.

Standard test conditions :

Temperature: 20 degree ± 2 degree
Humidity: 65% ± 5% RH
Standard test circuit: Vc: 5.0V ± 0.1V; Vh(high):5.0V±0.1V
Vh(low):1.5V±0.1V

Electrical properties:

Input voltage: DC5V power (current): 150mA
DO output: TTL digital 0 and 1 (0.1 and 5V)
AO output :0.1-0 .3 V (relatively clean), the highest concentration of voltage around 4V

Specifications and Features:

1. Operating voltage : DC 5 V.
2. IC driver: LM 393.
3. Size : 11 x 33 x 20 mm.
4. Range: 10 to 1000 ppm.
5. Characteristic gas: 100 ppm CO.
6. Sensitive resistance: 2 to 20 10kohm 10kohm at 100ppm CO.
7. Sensitivity : ≥ 3%.
8. Return time: ≤ 30 s.
9. Heating resistance: ± 31ohm 3ohm.
10. Heating current: ≤ 180 mA.
11. Reaction time: ≤ 1 s.
12. Heating voltage : 5.0V ± 2V / 1.5 ± 1V.
13. Heating power: approx. 350 mW.
14. Ambient temperature : -20 ° C to + 50 ° C.
15. Humidity: ≤ 95% RH.
16. Oxygen content: 21%.
17. The analog output voltage, the higher the concentration the higher the voltage.
18. The carbon monoxide detection with better sensitivity.
19. There are four screw holes for easy positioning;
20. Product Dimensions: 32 x 20 x 22 mm (LxWxH)
21. With a long service life and reliable stability
22. Rapid response and recovery characteristics

Attachments and Links :

MQ-7 Datasheet:

Package Includes :

1 x MQ7 CO Carbon Monoxide Coal Gas Sensor