The galvanic galvanic cell idea is used in the oxygen detector. Its design involves installing a lead anode and a silver cathode in a galvanic cell that is sealed off from the outside by a thin layer. A redox reaction takes place when oxygen-containing air flows through the thin layer and reaches the cathode. The sensor will therefore have an output voltage at the mV level that is proportionate to the oxygen level. After this voltage signal is amplified, the voltage and current are transformed, and the output is a standard signal of 4-20mA that represents the content within the range of oxygen percentage (0-30%).
The poisonous and harmful gas detector uses electrochemical sensors that are imported from around the world and use the controlled potential electrolysis approach. By altering the sensor for various gases and altering the polarization voltage value, the polarization voltage of various gases may be measured.
Through the membrane, the test gas gets to the working electrode, where a redox reaction takes place. The sensor will now produce a tiny current. This current varies in direct proportion to the amount of hazardous and dangerous gases present. After sampling and processing, the current signal is changed into a voltage, and the voltage signal is then amplified. The content (ppm value) within the detection range of dangerous and harmful gases is then converted into a 4-20 mA standard signal output by performing voltage and current conversion.
Organic volatiles use the world's high-quality photoion gas sensor (PID), which uses the principle of photoion ionization gas for gas detection. Specifically, the target gas is irradiated/bombarded by the ultraviolet light generated by the ion lamp. The target gas will be ionized after absorbing enough ultraviolet light energy. By detecting the tiny current generated by the ionization of the gas, the target can be detected. gas concentration.
The professional infrared principle sensor is used by the carbon dioxide detector. It is a sensor that takes measurements based on the infrared photons' physical characteristics. It has a photoelectric detecting element, an optical system, and a detection element. According to various structural differences, optical systems can be classified into two types: transmission type and reflection type. According to its mode of operation, the detection element can be split into two categories: thermal and photoelectric. Thermistor is the thermal element that is most frequently utilized. The conversion circuit converts the thermistor's resistance, temperature, and output into an electrical signal when it is subjected to infrared radiation.
