The fixed gas alarm consists of an alarm controller and a detector. The controller can be placed in the duty room to control the monitoring points. The gas detector is installed in the most leaking place of the gas . 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 An alarm signal is issued, and an external device such as a solenoid valve or an exhaust fan 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 increasing the signal amplifier.
Second, 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 split line: generally use national standard or non-standard RVV3*1.0-1.5-2.5mm2, if the signal interferes with the premiere national standard or non-standard RVVP3*1.0-1.5-2.5mm2, (letter R stands for soft line, letter V point semi-insulator) Polyvinyl chloride (pvc), the letter P stands for shielding).
Four-wire bus: generally use national standard or non-standard RVV4*1.0-1.5-2.5mm2, if the signal interferes with the national standard or non-standard RVVP4*1.0-1.5-2.5mm2, (letter R stands for soft wire, letter V is semi-insulator) Polyvinyl chloride (pvc), the letter P stands for shielding).
Two-wire bus: Use RVS2*2.5 twisted pair (the letter S stands for twisted pair, the letter R stands for cord, and the letter V stands for polyvinyl chloride (insulator)).
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