4 Pin RTD Wiring?

[HIlife]

I've got a pair of PT100 RTD sensors from eBay with four pins and four wires. As far as I know, a true four wire RTD utilizes all four as sensor wires as opposed to the more common 3 wire for temperature measurement.

It looks like what I have is actually a 3 wire with a ground, not a real 4 wire sensor. Do I just wire this up like a 3 wire and send the last wire to ground, or do I need to do something different?

 

[doug293cz]

Based on the terminal markings, the fourth wire is in fact a ground shield, and should be connected to ground. This will help reduce electrical noise on the other signal wires.

Brew on :mug;