Two Wire RTD PT100 question - Home Brew Forums
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Old 03-30-2013, 07:50 PM   #1
Kdubbs
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Mar 2010
Denver
Posts: 29


I am having problems wiring a two wire white and black PT100 RTD that I got from Brewers Hardware to a MyPin TA4. I have set the TA4 for the proper input. Just keep getting a ULLL for the temp reading.

I have attached the wiring diagram. Any help would be much appreciated.



 
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Old 03-30-2013, 08:04 PM   #2
AllanMar
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Jun 2008
Canada
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How are you connecting it?

I'm not familiar with this PID, but from the DWG you posted PIN 7 & 10 connect to one side of the RTD and 8&9 to the other side.



 
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Old 03-30-2013, 08:19 PM   #3
Kdubbs
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Mar 2010
Denver
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right now I have white connected to 7 and black to 8

 
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Old 03-30-2013, 08:25 PM   #4
AllanMar
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Jun 2008
Canada
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Install jumpers as shown in the diagram (7 to 10 and 8 to 9)

 
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Old 03-30-2013, 08:42 PM   #5
Kdubbs
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Mar 2010
Denver
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That does it! Thanks for the help!

 
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Old 03-30-2013, 09:29 PM   #6
AllanMar
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Jun 2008
Canada
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No problem. Keep in mind as it's a 2-wire RTD line resistance will effect the reading, so make sure you do some sort of calibration/verification just to be sure.

 
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Old 03-31-2013, 01:48 PM   #7
tlb2525
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Aug 2011
Cape Girardeau, MO
Posts: 9

I buy my RTD's from Auber Instruments and they are 3-wire...2 reds and 1 white. I use the TA4 and have never had a problem.

 
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Old 05-04-2013, 01:57 AM   #8
thirstytroll
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May 2013
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Thanks for the wiring configuration on this T4. this helped. I am using this for my freezer to lager. I have set the the set value to 34 degrees, the the thermocouple reads 46 degrees(in my garage which is about right ) .The freezer should turn on and nothing is happening. The manual is pathetic . Are there parameters i need to change other then the control direction to COOL ? Very frustrated. I wished i brought the most simplistic one.Please help.

 
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Old 05-04-2013, 10:07 PM   #9
AllanMar
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Jun 2008
Canada
Posts: 192
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Quote:
Originally Posted by tlb2525 View Post
I buy my RTD's from Auber Instruments and they are 3-wire...2 reds and 1 white. I use the TA4 and have never had a problem.
3-wire RTD's compensate for line resistance and do not usually suffer from the problems I mentioned with 2-wires.

Quote:
Originally Posted by thirstytroll View Post
Thanks for the wiring configuration on this T4. this helped. I am using this for my freezer to lager. I have set the the set value to 34 degrees, the the thermocouple reads 46 degrees(in my garage which is about right ) .The freezer should turn on and nothing is happening. The manual is pathetic . Are there parameters i need to change other then the control direction to COOL ? Very frustrated. I wished i brought the most simplistic one.Please help.
Please provide some details on how you have it wired now? Does the display indicate that the output is coming on, or no?

 
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Old 05-06-2013, 04:54 PM   #10
thirstytroll
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May 2013
Posts: 3


Thanks for your response. I wired the 2 wire thermocouple PT100( two identical black wires) to #7 an 8. And two wires that hop, as was described by you on a prior post. one for #7 to #10 , and #8 to #9. By doing the hops. I got a good temp reading. The (out) led light goes on like it should but the volt reading is about 11-12 volts. I also flipped the two thermo wires just to see ,and no change.



 
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