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There are several types such as semiconductor, hot-wire, electro-chemical, solid electrolyte, and infrared.
High sensitivity to low concentration gas, low cost, and long life.
Influenced by ambient temperature and humidity, and low selectivity.
For gas leak detectors, air conditioners, air purifiers, alcohol checkers, various measurement equipment, etc.
Though it depends on the kind of gas, our gas sensors can measure gas in the range of tens ppb to tens of thousands of ppm.
The life is semi-permanent if used under usual ambient atmospheric conditions. The sensitivity may change from a long-term view point.
It is (Rs in clean air)/(Rs in gas), where Rs means Sensor Resistance. Since Rs generally decreases in gas, the gas sensitivity is below 1.
It is the time for the sensor to respond after the gas reaches the sensor.
It is the sensor behavior from power-on to the ready status.
All the gases except the target detection gas. Such noise gases may exist in usual ambient air.
Unfortunately, semiconductor gas sensor cannot detect inactive gases.
Ambient humidity (water vapor) can be considered as a kind of gas.
Oxygen is required. Use the sensor under usual ambient atmosphere.
Basically, tin oxides. Other materials are tungsten oxides, indium oxides, etc.
Do not bend or cut the pins because the sensor will be mechanically shocked.
Manual soldering is recommendable to avoid the solder's flux from influencing the sensor.
No, you need such construction housing separately.
The sensor should be heated to detect gases. Cooling down with fans, etc. will change the sensitivity.
The sensing element temperature will be changed, then the cross sensitivity will also be changed.
The heater may deteriorate so that the operating temperature cannot be controlled.
Refer to PDF sensor data by clicking here "Gas Sensors".
Yes, we have. Click here "Environment and Quality" for details.