Power supply for combustible and toxic gas detection probes

1. The combustible and toxic gas control cabinet is located in the fire control room; the UPS power supply is also placed there. It is far away from various work areas, with some distances exceeding 400 meters. How can power be supplied to the sensors? 400 meters is not a long distance; it is possible to check the operating voltage of the probe, select an appropriate cable cross-section, calculate the voltage drop, and ensure that the supply voltage minus the voltage drop remains within the operating voltage range of the probe. 2. Can the fire alarm system operate using the dedicated 24VDC power supply for firefighting used on site? It is recommended to power it with a toxic gas alarm. Otherwise, the fault points will be scattered; of course, it’s necessary to do this, and I don’t see any regulations stating that it’s not allowed. 3. The specifications require that the probe be powered by a UPS; this fire protection system uses 24VDC power to charge the battery – I’m not sure if this counts Also, are there any requirements regarding the UPS battery life? GB 50116 Code for Design of Automatic Fire Alarm Systems: 10.1.1 Automatic fire alarm systems shall be equipped with an AC power supply as well as a backup battery power supply. 10.1.2 The AC power supply for the automatic fire alarm system shall be provided by the fire protection power supply; the backup power supply can be the battery power built into the fire alarm controller and the fire control linkage controller, or the emergency power supply for fire protection equipment. When the backup power supply is the emergency power supply for fire protection equipment, the fire alarm controller and the fire control linkage controller shall have separate power supply circuits, ensuring that their normal operation is not affected even when the system is under maximum load. 10.1.5 The output power of the emergency power supply for fire-fighting equipment shall be 120% of the full-load power of the fire alarm and interlocking control system; the capacity of the battery bank shall ensure that the fire automatic alarm and interlocking control system can operate continuously for more than 3 hours under the simultaneous operating load conditions during a fire.