Is this a loop signal isolator/converter? It sounds like you are converting a 4-20mA signal to a 1-5V signal.
If that's the case, has it been initially calibrated for
this application(if it's new) or has it been calibrated
recently to compensate for 'drift'(if it's old)?
As crowbar1...
maddog,
I'm kicking myself for not thinking of this sooner.....
You didn't mention anything about a budget, but if it's not too tight, consider this option: How about a single loop, using the one sensor, either powered from the measuring device or from a separate power supply, and feed the...
maddog,
I don't think I've been much help here - I just tossed in
my two cents worth.
I'm not familiar with the type of input you're using.
I have seen cases where only part of the range of a 4-20mA input is actually utilized, but what you're suggesting is actually going to be out of range for...
Maddog,
This response is probably way too late, but here goes anyway.
The only applications I've seen with 4-20mA loops terminate
on a 250 ohm resistor at an input. You can actually measure this resistance at an input with an ohmmeter.
Typically, you can have up to three 'devices'(read...
cfordyce,
I have dealt with systems integrators who have used the
Koyo PLC's with success, and I'm still watching one particularly trying installation years later(replaced
an existing PLC) - so far so good!
They tell me support is just a phone call away, and they
are prompt and knowledgable...