MQ138 Formaldehyde Aldehydes Gas Detection Sensor Module DC 24V [並行輸入品]

商品説明

Specifications:
- Size: 65mm x 45mm x 28mm
- Main chip: LM393, formaldehyde-sensing probe
- Working voltage: DC 24V
Features:
- With the signal output LED indication
- 2-way signal output (analog output, and TTL-level output)
- TTL output valid signal is low; (low output signal light, which can be accessed microcontroller IO port)
- Analog output increases with the concentration, the higher the voltage the higher the concentration
- Aldehydes, alcohols, ketones, aromatic compounds with high sensitivity
- With a long life and reliable stability
- Fast response characteristics
- With mounting holes for easy permanent installation
- The probe can plug design for easy testing
Application:?For the family, the environment of the volatile compounds detection devices, suitable aldehydes, alcohols, ketones, aromatic compounds detected, the gas sensor test concentration range:
Benzene:?1 to 100ppm?
Toluene: 10 to 100ppm
Methanol: 5 to 100ppm
Alcohol: 30 to 300ppm
Acetone: 10 to 300ppm
Formaldehyde: 1 to 10ppm