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MQ - 7 sensor's brief introduction:
MQ - 7 gas sensor used by the gas sensitive material is in clean air conductivity low tin oxide (SnO2).Using high and low
temperature cycle test low temperature heat (1.5 V) carbon monoxide, sensor conductivity increases with increasing
concentration of carbon monoxide gas in the air, high temperature washing the low temperature heat (5.0 V) stray gas
adsorption.Using a simple circuit can be the change of the conductivity, converted to correspond to the gas
concentration of the output signal.MQ - 7 high sensitivity of carbon monoxide gas sensor, the sensor can detect a
variety of gas containing carbon monoxide, is a low-cost sensor suitable for many applications
Brief description:
A long, size: 32 mm X 22 mm X 27 mm wide
Second, the main chip: LM393, MQ - 7 gas sensors
Three, working voltage: dc 5 v
Features:
- A signal output instructions.
- Two-way signal output (TTL level output and analog output)
- TTL output signal for low level effectively.(when the low output electric signal lights at ordinary times, can be directly by single chip microcomputer)
- Analog 0 ~ 5 v voltage, the higher the concentration, the higher the voltage.
- On carbon monoxide has a high sensitivity and good selectivity and has long service life and reliable stability
The application:
Carbon monoxide detectors used in family, environment.Suitable for the detection of carbon monoxide, gas, etc.
Application module:
Carbon monoxide detectors used in family, environment.Suitable for the detection of
carbon monoxide, gas, etc.
The module features:
- High-quality double panel design, with power indicator and TTL signal output;
- Have DO switch signal output (TTL) and AO analog signal output;
- TTL output signal for low level effectively. (when the low output electric signal lights at ordinary times, can be directed by single chip microcomputer or relay module)
- Analog output voltage, the higher the concentration, the higher the voltage.
- The carbon monoxide detection has better sensitivity.
- There are four screw holes to facilitate positioning;
- Product appearance size: 32 (L) * 20 (W) * 22 (H)
- Has long service life and reliable stability
- Rapid response recovery features
Electrical properties:
The input voltage: DC5V power consumption (current) : 150 ma
The DO output: TTL digital quantity 1 s and 0 s (0.1 and 5 v)
AO output: 0.1-0.3 V (pollution-free), the highest concentration of voltage is 4 V or so
Special remind:
Sensor, after the power supply need to preheat about 20s, that are stable, the measured data of sensor fever belongs to the normal phenomenon,
because of internal heating wire, if hot is not normal.
