4 wire Pt100 probe to 2/3 wire temperature controller
4 wire Pt100 probe to 2/3 wire temperature controller
(OP)
Hi all.
We have 4 wire Pt100 probe for submersible pump motor protection and temperature controller which supports 2 or 3 wire measurement installed on the site.
What is the best way to adapt the probe to controller? I have found some drawings online suggesting 2 wire connection of 4 wire probe, simply by shortening of the wires at the same side of the probe, but I'm not sure will it be working properly. Haven't found nothing about 3 wire connection of 4 wire probe.
Any experiences about the subject?
We have 4 wire Pt100 probe for submersible pump motor protection and temperature controller which supports 2 or 3 wire measurement installed on the site.
What is the best way to adapt the probe to controller? I have found some drawings online suggesting 2 wire connection of 4 wire probe, simply by shortening of the wires at the same side of the probe, but I'm not sure will it be working properly. Haven't found nothing about 3 wire connection of 4 wire probe.
Any experiences about the subject?





RE: 4 wire Pt100 probe to 2/3 wire temperature controller
RE: 4 wire Pt100 probe to 2/3 wire temperature controller
RE: 4 wire Pt100 probe to 2/3 wire temperature controller
RE: 4 wire Pt100 probe to 2/3 wire temperature controller
4-wire is a resistor element with 2 wires connected to each end.
3-wire is a resistor element with 1 wire connected to one end and 2 wires connected to the other end.
2-wire is a resistor element with 1 wire connected to each end.
So, to convert from 4-wire to any other configuration you can just parallel or ignore the extra wires. I would suggest you do as follows,
Connect the 2 wires from each end of the element together to parallel the wires if using the 2-wire connection.
Use 3 of the 4 wires if using the 3-wire connection. There will be a bigger error in the compensation for the lead length if you connect the 4th wire in parallel on the side of the element that only has a single connection.
RE: 4 wire Pt100 probe to 2/3 wire temperature controller
Regards,
Miki