4-20mA input to pneumatic valve, what is recommended.

[thrusterpump]

I need to select a device to control a pneumatic valve using the 4-20mA input on the actuator. The control must be manual, by that I mean the user will vary the 4-20mA current to set the valve in the desired position by whatever means the device allows. We would prefer that the control allow for very fine adjustments. Any recommendations on what type of device can be easily incorporated and used on this type of application? It is in an industrial setting that will be regularly used. Any advice would be greatly appreciated.

 

[JLSeagull]

Try posting this in the Industry Forums for Control Systems Engineering. Someone there should have model numbers. Within a DCS or PLC this is commonly known as a hand controller - the electronic version of a pneumatic manual loader. Lacking a DCS or PLC, you should be able to find a configurable 1/2 or 1/4 DIN controller and configure as manual only. The worst case is to establish a potentiomenter circuit that adjusts a 4-20 mA output.

 

[thrusterpump]

Thanks, I'll try posting in the forum mentioned.