False alarm from toxic and hazardous alarm device
Thread Content
Three years ago, six detectors for toxic and harmful gases were installed to detect benzene leaks, but their performance has not been satisfactory; the devices are highly affected by environmental conditions – high air humidity on rainy days causes them to give false alarms. Under normal conditions, the value is generally between 0 and 10 ppm; in humid weather it is around 40, on rainy days it is around 90, and can even reach 180. The set alarm threshold is 25, which is why people are greatly affected by false alarms.
Let me start by saying that false alarms are virtually unheard of in our company; we calibrate our equipment using standard gases on a quarterly basis
The probe will age, so it needs to be replaced frequently; with proper maintenance, it will not give false alarms. The report proves that it really exists in the environment
We have been constantly testing them; due to frequent false alarms, we replaced them several times with new ones. The manufacturer said that the probes of toxic and harmful gas detectors are very sensitive to humid air.
We use Dräger devices; you can use a portable device to check them each time, and generally, if the calibration is done properly, there should be no issues. That means your air quality data is indeed available, which also proves that your sensors are quite sensitive
What principle does your sensor operate on? Does it only trigger an alarm when the air is more humid and there is a high level of benzene leakage?
For this type of alarm detector used by professionals, the effective usage period is generally two years; after that it needs to be replaced or sent back to the factory for calibration, otherwise its accuracy will be quite low
There’s nothing that can be done about this. Alarm devices installed outdoors need to have sun and rain protection covers. If false alarms still occur, then there’s nothing else to do. How is it possible to get a reading of 180 when the actual value should be below 25? This has nothing to do with rain, right? Logically, it should be easier not to report it when it’s raining
It is understood that the probe is imported and of the electrochemical type.
It will trigger an alarm in conditions of rain, heavy fog, or high humidity – even with a newly calibrated alarm.
In the case of such false alarms, did you use a portable device to measure the values of the surrounding environment? If the portable device also shows the same value, then it proves that the alarm is functioning properly and is sensitive enough. If it shows a different value, then it’s necessary to communicate with the manufacturer to find out why this is happening