The fixed gas detector consists of an alarm controller and a detector. The controller can be placed in the duty room and mainly controls the monitoring points. The gas detector is installed in the place where the gas is most likely to leak. The core component is a built-in gas sensor. The sensor detects the concentration of gas in the air. The detector converts the gas concentration detected by the sensor into an electrical signal and transmits it to the controller through the cable. The higher the gas concentration, the stronger the electrical signal. When the gas concentration reaches or exceeds the alarm point set by the alarm controller, the gas alarm. The alarm signal is issued, and external devices such as solenoid valves and exhaust fans can be activated to automatically eliminate hidden dangers.
First, the transmission distance of the cable
The maximum distance is 1000 meters, which is related to the number of gas detectors and the thickness of the cable used. The source distance can be increased by adding a signal amplifier to increase the transmission distance.
What are the output signals of the detector?
Three-wire system: 4-20MA standard signal, two-wire system: M-BUS signal or RS485 signal, four-wire system: RS485 signal, standard RS485 signal
Third, commonly used cable specifications
Three-wire branch line: generally use national or non-standard RVV3 * 1.0-1.5-2.5mm2, if the signal interferes with the premier national or non-standard RVVP3 * 1.0-1.5-2.5mm2, (the letter R represents a flexible wire, the letter V points a semi-insulator Polyvinyl chloride (PVC), the letter P stands for shielding).
Four-wire bus: generally use national or non-standard RVV4 * 1.0-1.5-2.5mm2, if the signal interferes with the premier national or non-standard RVVP4 * 1.0-1.5-2.5mm2, (the letter R represents a flexible wire, the letter V points a semi-insulator Polyvinyl chloride (PVC), the letter P stands for shielding).
Two-wire bus: use RVS2 * 2.5 twisted pair (letter S stands for twisted pair, letter R stands for flexible wire, letter V stands for polyvinyl chloride (insulator)
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