air mass sensor, MQ135 sensor, harmful gas detection module

Product Description

air mass sensor, MQ135 sensor, harmful gas detection module

Air quality sensor with fast response and high sensitivity.
Simple, stable and long-lasting drive circuit. Interface with microcontrollers and pic development boards, Arduino, raspberry, cortex, etc …
Threshold adjustable by trimmer.

Connections:
– Power +
– GND power supply
– Digital output
– Analog output

APPLICATION
They are used in air quality control equipment for buildings, offices, etc.
They are suitable for detecting NH3, NOx, alcohol, benzene, smoke, CO2, etc.

Technical specifications:
Power supply voltage 5V ± 0.1 AC or DC
Heating voltage 5V ± 0.1 ACOR DC
Adjustable RL load resistance
Indoor heating resistance 33? ± 5%
Heating consumption below 800mW

Detection of harmful environmental gases suitable for the detection of ammonia, aromatic compounds, sulphide gases, benzene vapors, smoke and other harmful gases, concentration range of gas-sensitive test: 10 to 1000 ppm
Module features:
1, using a two-sided high-quality design, has a power indicator and TTL signal output instructions;
2, with DO switchover signal (TTL) output and analogue output AO;
3, the output TTL output signal is low. (When the low output signal light can be directly connected to the microcontroller or relay module)
4, the analog output voltage, the higher the concentration the higher the voltage.
5, air quality, detection of hazardous gases with greater sensitivity.
6, there are four holes for easy positioning;
7 Product Dimensions: 32 (L) * 20 (W) * 22 (H)
8, with a long life and reliable stability
9, quick response and recovery features
 
Electrical Properties:
Input voltage: DC5V current consumption (current): 150mA
DO Output: Digital TTLs 0 and 1 (0.1 and 5V)
AO output: 0.1-0.3 V (relatively clean), maximum concentration of about 4 V voltage
Special Note: After powering the sensor, it needs to heat about 20s, the measurement data stability, sensor fever is a normal phenomenon, because the internal heating warmer is not normal.
Trial procedure:
Function: This version supports trial procedures
Use the chip: AT89S52
Crystal: 11.0592MHz
Transmission Rate: 9600
Compile the environment: Keil