MQ-139 MQ139 Gas Sensor Module (สารทำความเย็น Freon : R11, R22, R113, R134A, R409A, R410A)

The formaldehyde gas sensor detection module outputs TTL level signals (can be connected to the IO port of a single-chip computer, such as 51, etc.) and voltage analog signals. In addition, the module can detect aldehydes/benzenes/aromatics/ketones, etc. Detection data error and consistency belong to the low-end grade. Applied to qualitative judgment and non-positive quantitative detection. The cross data of interference from VOC and TVOC gas is more obvious.

The provided examples and materials are all attached by e-mail (be sure to note the e-mail address when taking pictures so as not to cause the e-mail to be sent out in time)

Formaldehyde gas detection sensor MQ138 aldehyde ketone alcohol gas sensor 

1. Size: 34mm X24mm X30mm length*width*height

2. Main chip: LM393, MQ138 formaldehyde sensor

3. Working voltage: DC 5V

4. Features:

              1. With signal output indicator light;

              2. Dual signal output (analog output and TTL level output);

              3. TTL output effective signal is low level; (the signal light is on when the output is low level, and can be connected to the IO port of the single-chip microcomputer)               

              4. The analog output increases as the concentration increases, the higher the concentration, the higher the voltage;

              5. High sensitivity to aldehydes, alcohols, ketones and aromatic compounds;

              6. It has a long service life and reliable stability;

              7. Fast response and recovery characteristics;

              8. With mounting holes, convenient for fixed installation;

5. Application:

    Volatile substance detection device for home and environment, suitable for detection of aldehydes, alcohols, ketones, aromatic compounds, and gas sensor testing