Thermocoupler type

[brewmaster 2011]

I am trying to figure out what kind of thermocoupler in need from the wiring on a used chiller I bought. it has 3 wires marked in order bottom to top in the picture. PTA, PTB, and PTC. and one have an idea?

[Luch15]

Rtd?

Hi there,
first are you certain that it is a thermocouple and not an RTD probe? The reason I ask is that a thermocouple measures temperature using two wire leads of dissimilar metals, thus it has only two contacts not 3. RTD's commonly have 3 contacts and measure temperature via resistance rather than thermoelectric effect like a thermocouple. RTD's are far more common but if you have the manual we can be sure, if not can you tell me the make and model?

[brewmaster 2011]

Hi there,
first are you certain that it is a thermocouple and not an RTD probe? The reason I ask is that a thermocouple measures temperature using two wire leads of dissimilar metals, thus it has only two contacts not 3. RTD's commonly have 3 contacts and measure temperature via resistance rather than thermoelectric effect like a thermocouple. RTD's are far more common but if you have the manual we can be sure, if not can you tell me the make and model?

I don't have the manual to it. could it be a PT100 probe? just thinking it is that due to the wire marked PTA-C.

[Luch15]

Rtd

Yeah quite possibly so. PT100 is an RTD type probe. I have bought them from Automationdirect.com and they aren't very expensive, since you don't have the manual you might want to order a probe and give it a try.

[brewmaster 2011]

Yeah quite possibly so. PT100 is an RTD type probe. I have bought them from Automationdirect.com and they aren't very expensive, since you don't have the manual you might want to order a probe and give it a try.

Is there one your recommend from them?

[germanbrewerjk]

it depends on what your temp controller is set. In most controllers you have to set your sensor typ if its a J or K or a pt100 or other.
If you set the wrong sensor in the controller you might burn your sensor this happend to me a few months back.

[Lumberjack]

Manufacturer

If you have a the model number and the manufacturer, I would just call the manufacturer directly, and as for tech support. I am sure they can point you in the right direction and would probably be happy to sell you one.

[brewmaster 2011]

this is the in pdf for my temp controller on the glycol chiller

http://yudian.com.hk/attachment/product/20110823165114_file_0.pdf

it says it can take a RDt pt100 but I am a little confused because the cut wire to the old probe had a ground wire. That is why I am on here.

[Luch15]

this is the in pdf for my temp controller on the glycol chiller

http://yudian.com.hk/attachment/product/20110823165114_file_0.pdf

it says it can take a RDt pt100 but I am a little confused because the cut wire to the old probe had a ground wire. That is why I am on here.

Type J and K are thermocouples not RTD. There is no ground connection on RTD. 2 wires go to one side of the sensor and 1 to the other. That is a little confusing, of course were assuming the cut wires were wired correctly in the first place. Let me read over the manual and see what makes sense.

[lhall]

Looks like it can take either thermocouples or a PT100 rtd. You'll have to put power to it and see what the input setting was set for. RTDs are more reliable especially for a longer distance.