Electrochemical. Electrochemical gas detectors work by allowing gases to diffuse through a porous membrane to an electrode where it is either chemically oxidized or reduced. The amount of current produced is determined by how much of the gas is oxidized at the electrode, indicating the concentration of the gas
Gas sensors are devices that can detect the presence and concentration of various hazardous gases and vapors, such as toxic or explosive gases, volatile organic compounds (VOCs), humidity, and odors [1].
Features
Calibration–free
Supply Voltage: 3.3V DC regulated +/– 5%
Low power
Wide VOCs detection range
High sensitivity
High resistance to shocks and vibration
Specification
| Operating Power | 125 mW Warm-up Time 15 min |
| Operating Temperature | 0°C to 50°C |
| Detection Method | Semiconductor gas sensor, detecting a wide range of VOCs |
| Monitoring Range | 400-2000 ppm equivalent CO2 0-1000 ppb isobutylene equivalent tVOCs |
| PWM Output | Pin 1 : TTL output 30Hz +/-1%, Range 5…95%, duty cycle 3.3V Use a pull-up resistance between Pin 1 and Pin 6 Pull-up value: typ. 10kOhms for 3.3V operation |
| I2C Output | Pin 2 and 4 : Pull-up of 4.7 kOhms on master SDA and SCL |
| Frequency | 1 Hz |
| Response Time | Equivalent to conventional NDIR-CO2 sensors < 5 seconds for tVOC Refresh Output |
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