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The oxygen detector is based on the principle of galvanic galvanic cells. Its structure is that the anode (lead) and the cathode (silver) are arranged in the primary cell, and the membrane is isolated from the outside. When oxygen-containing gas in the air passes through the membrane, it reaches the cathode. An oxidation-reduction reaction occurs. At this time, the sensor will have a mV voltage output proportional to the oxygen concentration. After this voltage signal is amplified, the voltage and current are converted and the percentage of oxygen (0 to 30%) is converted to 4 to 20 mA of standard signal output. .
The poisonous and harmful gas detector adopts the world's most advanced imported electrochemical sensor. It applies the principle of controlled potential electrolysis. Its structure is to place three electrodes in the electrolytic cell, namely the working electrode, the counter electrode and the reference electrode, and apply certain The polarization voltage, the replacement of different gas sensors and change the polarization voltage value, can measure different toxic and harmful gases. Measured gas through the membrane reaches the working electrode, redox reaction occurs, the sensor will have a small current output, this current is proportional to the concentration of toxic and harmful gases, this current signal is converted into a voltage by the sampling process, the voltage signal is amplified After the voltage and current conversion, and the toxic and harmful gases in the detection range of the content (ppm value) into a 4 ~ 20mA standard signal output.
Organic volatiles use the world's top photo-ion gas sensor (PID), which uses the principle of photoionization of ionized gases for gas detection. Specifically, the ultraviolet light generated by the ion lamp is used to irradiate/bombard the target gas. After the target gas absorbs enough violet light energy, it will be ionized. By detecting the tiny current generated after the gas ionization, the target can be detected. Gas concentration.
Carbon dioxide detector uses the world's most advanced infrared principle sensor, it is the use of infrared physical properties to measure the sensor, which includes the optical system, detection components and photoelectric detection components. The optical system can be divided into two types, transmissive and reflective, depending on the structure. The detection element can be divided into a thermal detection element and a photoelectric detection element according to the working principle. Thermistors are most often used for thermistors. When the thermistor receives infrared radiation, the temperature rises, the resistance changes, and the electrical signal is output through the conversion circuit.
Gas detector and various sensors work
The flammable gas detector adopts the latest generation of low-power high-interference type carrier catalytic sensors. It forms a detection bridge with two fixed resistors. When the air contains flammable gas diffused on the surface of the detection sensor, the flameless combustion is rapidly performed under the action of the catalyst on the surface of the sensor, and the reaction heat is generated so that the resistance value of the platinum wire of the sensor is increased, and the detection bridge outputs a differential pressure signal. The magnitude of this voltage signal is directly proportional to the flammable gas concentration. After it is amplified, it conducts voltage and current conversion and converts the percentage content (% LEL) of the flammable gas explosion lower limit to a 4-20 mA standard signal output.
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