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subcool 01-20-2013 12:41 PM

checking temp probes
Hey I posted a thread about me heatpump doing funky stuff, beenthere thought maybe the filter/drier was blocked. I went to check to temp difference across it and notice the temp was changing from just moving it .5 inch on both vapor and liquid lines. never the same reading twice!

How do I check to make sure my temp probes are working properly?

Thanks for the help

yuri 01-20-2013 01:00 PM

If you want to know they are accurate stick them on an ice cube and should read 32F. Probes and ESPECIALLY the end where leads attach to a multitester bend a LOT and eventually the wire strands break there inside the cable. I try to buy the silicon wire probes and add elect tape where they bend.

beenthere 01-20-2013 04:41 PM

Ice water works better.

An ice cube out of the freezer is much colder then 32 degrees. And the part of the probe exposed to air would be subjected to a temp well above 32 degrees.

subcool 01-20-2013 05:01 PM

I will do both tonight and see which gives the better measurement. I would think the ice water would work better as well, but it sounds like a great test.

beenthere 01-20-2013 05:07 PM

Stir ice water and let sit for 1 minute before testing probes.

yuri 01-20-2013 05:22 PM

ice water is better but you need to use lots of ice and get the glass sweaty. have not done it for a long time but used to check the old stick type thermometers we had B4 everything went electronic.

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