What is the voltage for pneumatic valves, flow meters, pH meters, pressure gauges, thermometers, and other devices with remote transmission functions?

2022-11-11View Original

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What is the voltage for pneumatic valves, flow meters, pH meters, pressure gauges, thermometers, and other devices with remote transmission functions?

Reply #22022-11-17

Two-wire instruments: DC24V; four-wire instruments: DC24V or AC220V

Reply #32022-11-18

This question is easy to misunderstand. Are you referring to the supply voltage for the instrument, or the open-circuit voltage of the analog signal? Now, many two-wire transmitters do not generate a signal if there is no external power supply in the circuit. In the four-wire system, the open-circuit voltage actually changes as the signal changes. As for the power supply methods for instruments, the most common ones are 24V DC and 110/220V AC, but I have also seen those powered by 12 VDC; some alarm systems in field applications use this type of power supply.

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