Features:

Heating voltage: 5 ±0.2V

Working current: 180mA

Circuit voltage: DC5V 

Load resistance: 10K (adjustable)

Test concentration range: 1-100ppm

Clean air voltage: <1.5V

Sensitivity: > 3%

Response time: <1S (3-5 minute warm-up, theory preheating time 48 hours)

Response time: <30S

Component power consumption: <0.9W

Working temperature: -10 ~ 50 oC (nominal temperature 20 oC)

Humidity: 95% RH (nominal humidity 65% RH)

Life: 5 years

Size: 35mm×40mm×28mm

Weight Size: 15g (approximately)

Kit include:

1 x MQ 138 Gas Sensor Module