Working principle of ammonia alarm;
When the alarm detects that the gas concentration in the environment reaches or exceeds the preset alarm value, the alarm transmits the signal to the controller through the shielded cable, and the controller immediately gives an audible and visual alarm, and at the same time, the exhaust device can be started or the electromagnetic valve can be closed to cut off the gas source, thus achieving the safety purpose.
Extended data:
Matters needing attention in installation and use of ammonia alarm
1. Find out the possible leakage point of the monitored equipment, analyze the leakage pressure, direction and other factors, draw the probe position distribution map, and divide it into three levels according to the severity of the leakage.
2. According to the specific factors such as the air flow direction and wind direction of the place, judge the leakage direction of toxic gas when a large number of leaks occur.
3. According to the density (greater than or less than air) and air flow trend of the leaked gas, the three-dimensional flow trend diagram of the leaked gas is synthesized, and the initial setting scheme is made at the downstream position of the leaked gas.
4. Study whether the leakage state of the leakage point is micro-leakage or jet. If it is micro-leakage, the position of the set point should be closer to the leakage point. If it is jet leakage, it should be slightly away from the leakage point.
5. For places with large toxic gas leakage, according to relevant regulations, a detection point shall be set every10-20m-20m.
6. For places with hydrogen leakage, the detector should be installed on the plane above the leakage point.
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