What are the restrictions on the use of several probes (sensors)?
(1) Probe for detecting combustible gas:
Oxygen at least 9% VOL is required for correct measurement;
Poisoning (hydrogen sulfide, refrigerant, silicon gas) will reduce the sensitivity;
Substances with a flash point higher than 38°C, such as aviation fuel, kerosene, etc., will cause inaccurate measurement
(2) Probe for detecting carbon monoxide:
For alcohols, hydrogen is very sensitive and may cause errors.
(3) Probe for detecting oxygen:
The shortest lifespan and the most vulnerable to damage
(4) Photoion detector PID
Can only be quantified, not qualitative. Limited by free energy, it cannot be detected above its energy, such as acrylonitrile.
