4-20mA to Relay Output

[TimWilborne 108]

I've got a few applications that need a simple relay closure based off of a setpoint on a 4-20mA input. I don't really want a PLC just to read an analog input and turn on a relay. I hunted through the Phoenix modules, sure that they would have something, but didn't find one. Does anyone know of a module or a simple way to do this?

[OkiePC 14]

How about this? http://www.actionio.com/support/datasheets...1080_ap1090.pdf Paul

[TimWilborne 108]

That's exactly what I'm looking for Paul. Thanks! TW

[Ken Moore 23]

I use the CPA from Moore industries alot. I like the fact that they are configured with a PC, you have lots of options, deadband, high alarm, low alarm etc..... you pick. Plus they also supply loop power for the instruments. http://www.miinet.com/products/data_sheets/cpa.pdf

[ECSI 17]

Weidmuller also have a few different types of process relays: http://signalconditioning.weidmuller.com/process-alarms.html

[TimWilborne 108]

Thanks everyone. I knew these things had to exist

[BudMan 1]

One more source to try. http://www.api-usa.com/signalconditioners_alarms.php Bud

[imufthi 0]

Does anyone know this component can use for Zone2? regards, Ivank

[DanW 41]

If Zone 2 is close to US class 1 Div 2, where nonincendive devices are authorized, there won't be such an animal. The restrictions for electronics for zone 2 is that they not have any relay contacts which are arcing, sparking devices. Solid state switches can pass, but not electromechanical contacts.

[Ken Moore 23]

For the link above, there is an optional ExP field enclosure.

[PLCMentor.com 60]

You might want to check the specs on the devices. Zone 2, or C1,D2 would be possible if the device uses hermetically sealed contacts. Russell

[Crossbow 295]

Weidmuller makes a whole line of these type devices, signal converters and relays.

[DanW 41]

I stand corrected. Mr. White is certainly correct that hermetically sealed electromechanical relays qualify for US Class 1 Div 2 hazardous areas. I'd forgotten about the pressure switches I've used several times that were so constructed. Dan

[PLCMentor.com 60]

Yeah Dan - problem is that none of the devices listed here have hermetically sealed contacts. I guess even if they did they may opt for not going for the certification. Did a quick search and couldnt find one. So maybe we are both right...Its possible just not available. Russell