I need to find a differential pressure transmitter for flow with 4 wire (0-20ma) output which works with 220VAC power supply, but I didn't find anything. who can help me?

 

There sure are a lot of them. Where did you look? Try (in no particular order):

Foxboro
Endress+Hauser
Rosemount
Siemens
STI
Honeywell
Yokogawa
Yamatake
Wika
ABB

...and a host of others, not meaning to slight anybody by not mentioning them.

Walt Boyes
Editor in Chief
CONTROL magazine
read my blog at www.livejournal.com/users/waltboyes or Sound Off! at
www.controlglobal.com
[email protected]

 

You might be able to help yourself by using anyone's conventional transmitter with a DC power supply.

Pressure (whether gauge, Dp or absolute) transmitters are typically DC devices, as an industry convention.

2 wire transmitters have a DC power supply (typically 24Vdc) in series with the transmitter.

3 wire transmitters use a separate DC power supply and use a common connection for signal (-) and for power supply (-).

4 wire transmitters use 2 wires for power and 2 wires for signal.

In 30 odd years of instrumentation I have yet to see a pressure transmitter with an integral or built-in power supply so that it could be used on line voltage. That doesn't mean there isn't one, but it must be a niche market.

What prohibits you from using a standard 24Vdc power supply?

 

Does it really need to be a 4 wire transmitter? Why not add a 220VAC/24VDC power supply and use a 2 wire tranmitter?

 

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Walt-

I am unfamiliar with Yamatake, Wika and STI, but the others do not offer a 4-wire process transmitter for pressure. In fact, it has been 25 years since I last saw such a device from any manufacturer.