Flammable gas alarm
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Our factory is equipped with alarms for hydrogen, a flammable gas, but after some time these alarms go off anyway (even though there is no hydrogen leakage or anything similar). We simply reset the alarms. I don’t know why the alarm went off; is the gauge inaccurate?
If the sunlight shines directly on the gauge, it might be a problem caused by the sunlight; try installing a sunshade.
This question. There is also a possibility of an instrument failure. But the concentration they measure is different from the concentration you perceive. Don’t rely on intuition either. At the PPM level, it’s imperceptible to you
Use a handheld device for comparison when calling the police. Take a look
For detecting combustible gases, an alarm is triggered only at 25%/50%, resulting in fewer false alarms; it is recommended to recalibrate it
It might be a problem with the instrument; calibrate it again
It might be due to prolonged exposure to sunlight; try using a sunshade.
What calibration gas did you use, CH4 or H2? Was a sensitivity correction for the \"H2 calibration gas\" performed after calibration? @jiaguoyun
We use the ones from Wuxi here (everyone knows which one it is, so I won’t mention the name). There are dozens of them, and from time to time a few of them stop working properly and start giving error messages; in such cases, it’s sufficient to recalibrate them using the standard gas on site – there’s no need to overcomplicate things. The probes we use here are of the chemical combustion type. In my opinion, having the probes exposed outside for long periods of time, subject to wind, sun, and rain, likely has some impact on them. So we bought a set of plastic rain caps designed to protect them, and the situation improved a bit. When we use magnets to set it in the calibration mode, a number is displayed. The value mentioned in the instructions serves as a reference for how many more times the probe can be used; generally, if this value drops below around 40, we replace the probe right away. For the original poster’s reference.
Over time, with the use of gas or toxic gas detectors, the sensors or circuit boards may age, resulting in a decrease in sensitivity; occasional false alarms are normal. This usually occurs due to zero drift, and it can be resolved by calibrating the device
We’ve had this situation where alarms keep going off; the entire factory area has been replaced many times. There are still things that haven’t been resolved in the end.