Can a 24V power supply always be connected where there are pressure transmitters and temperature transmitters?

It cannot be assumed absolutely; sometimes 220V may also be used

Not necessarily. Although many pressure transmitters and temperature transmitters require a 24V power supply, not every location has access to a 24V power source. In some cases, it may be necessary to use another power source, such as a 12V power supply or a DC battery. In addition, it is also necessary to select an appropriate power supply based on the specific requirements of the equipment and its power needs. .

Where there are people, there is a world of its own – more or less that’s the idea

This post was last edited by qugd on 2023-7-13 at 10:08. Nowadays, pressure transmitters and temperature transmitters are mostly of the two-wire type. Just because a transmitter of this kind exists does not mean it can necessarily be connected to a 24VDC power supply, as the power supply in the transmitter’s power circuit cannot supply power to any other loads other than the transmitter itself (with the exception of display instruments connected in series with such two-wire, non-bus transmitters for signal indication). The power supply for these two-wire transmitters may be located in a control room or field control station that is quite far away, even several kilometers distant. For the 24VDC power supply you need, if a load is to be connected, additional wiring is required; in the case of two-wire instruments, the power supply is usually provided directly through an analog signal input card. It is estimated that the original poster is unaware of the power supply characteristics of industrial field instruments, which is why they have such doubts.

Not necessarily; some individual pressure transmitters are powered by 220VAC