Need a solution for loop powered Fisher valve

[Walkerok]

I have a customer that has "sprung" the installation of a pneumatic actuated Fisher V6100 series valve. The valve is a modulating valve to be run from a 4-20ma signal. Here is my problem the valve requires 10Vdc minimum to be able to actuate at all. The Unitronics is not a loop power capable device and does not send out 10VDC untill about 18ma (or so).

I am using a V570 with an IO-Ai4-AO2 remote module to try and actuate this (I also have a V200-18-E6B module). Since the PLC is not able to provide what the valve needs. I need a best suggestion on what hardware anyone has used to isolate/amplify an output 4-20ma signal that is capable of providing the r4equired loop power.

Any help is welcome

Thanks all

Keith

[sgull]

Keith

You could use a loop isolator such as

http://www.acromag.com/sites/default/files/TT236_Current_Millivolt_Input_Two-wire_Transmitter.pdf

I have not used this before but should be ok

Not a cheap option though a unit like this could cost €170.00 but there is probably a cheaper option.

Regards

Denis

[TT_ZX]

I have the same problem with Spirax Sarco pneumatic positioners. I use the Seneca K109UI to overcome this problem but most isolating transmitters should cope.

http://www.senecauk.com/acatalog/K109UI.html

The K121 might also work for 4-20mA and is cheaper for me.

http://www.senecauk.com/acatalog/K121__Universal_Isolated_Transmitter_with_2_Wire_-_Loop_Powered.html

[PaulZ]

Have you looked at the Phoenix contact isolation amplifiers? For instance this one: https://www.phoenixcontact.com/online/portal/us?uri=pxc-oc-itemdetail:pid=2811297&library=usen&pcck=P-13-02-01&tab=1

Over the years I have installed many of them and I cannot recall one failing....