Signal converter 0-50 mA

[Thedroid]

I have the need for a 4-20 in 0-50 out signal converter. Are these still available? The existing unit is made by action instruments. I have searched the net with no luck. Was this a common control loop in the past. We are using this to control a servo valve on a hydraulic pump.

 

[danw2]

Well, Foxboro used 10-50mA for years before ISA established the 4-20 standard.

Is this active (internally powered 50mA output) or passive (external loop powered?)

The standard version below is active (internally powered from its own supply), but there's an option for loop powered output

Check out the API 4300G here:

http://www.api-usa.com/pdf/api/api_4300g.pdf

It lists the
- HC option, 50ma output:
HC High current output, >20 mA to 50 mADC
- EXTSUP Open collector output when a “sinking” output is required

Not sure if options work together or not.

If it's a "factory set" situation, (limited field zero & span) you might want to confirm that the range is truly 0-50ma and not 10-50mA.

Dan

 

[danw2]

Action is now part of Invensys

http://www.actionio.com/

 

[Thedroid]

Thanks for the help. I called API and said they could have one ready for me in 2-3 days. It definitely is 0-50 mA.