UPS power supply issue
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The specifications require that gas alarm controllers should be powered by a UPS. If a combustible gas controller is equipped with its own battery that can provide power for 30 minutes in the event of a power outage, and it normally operates on mains electricity but switches to using the built-in battery after a power failure, does this situation constitute using a UPS for power supply?
If the entire system, including the probe and controller, can operate for 30 minutes, I think what you said is feasible.
Is the mains electricity you use on a regular basis considered a first-class load?
The combustible gas controller comes with a built-in battery that provides power for 30 minutes in the event of a power outage. It is not necessary to install a separate UPS. If the device is powered by a UPS, the gas alarm should be connected to the UPS. That is, the alarm stays active for 30 minutes longer than other devices.