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david8370
07-30-2009, 03:26 PM
What's the best tool to measure differential temperature heat rise at the supply vs. return?
Refer-Madness
07-30-2009, 03:33 PM
A thermometer?
Daltex
07-30-2009, 03:34 PM
Fluke 52
viper1
07-30-2009, 03:39 PM
What's the best tool to measure differential temperature heat rise at the supply vs. return?



You mean the delta T?
david8370
07-30-2009, 03:41 PM
You mean the delta T?

Yes. Would something like this work? I don't want to spend a lot.
Refer-Madness
07-30-2009, 03:44 PM
David, do you do A/C for a living or do you just want to check you own unit to satisfy your curiosity?
WhoIsThat?
07-30-2009, 03:45 PM
What's the best tool to measure differential temperature heat rise at the supply vs. return?

Unless small differences are important, any household thermometer.

And it doesn't even have to have absolute accuracy because you're looking for a temperature difference using the same thermometer; all it needs is linearity, with non-linearity being "The deviation of an instrument's response from a straight line."
viper1
07-30-2009, 03:50 PM
Again, referred to as delta T. The change in temperature. As indicated, the delta T assume no need for accuracy relative to actual temps because you are only wanting to learn the "change in temperature" for temp rise.

I would recommend something utilizing a K type thermocouple due to the increased level of accuracy in the temps ranges you will be testing.
WhoIsThat?
07-30-2009, 03:57 PM
http://www.lestari-instruments.com/images/sling_bes_besar.gif
david8370
07-30-2009, 04:13 PM
how about this one?
Daltex
07-30-2009, 04:27 PM
It really depends on what you are wanting it for. If you are wanting to verify that the heat rise of the furnace is in spec. then I'd not waste your $$ on any of these. I'd call a tech.

If you are just curious as to what the split from the grills is then a cheap pen style will work as the degree of accuracy isn't that important.

For techs that are verifying the heat rise across a furnace, a proper guage with the proper tip is probably recommended. Placement of the probe is critical for accurate readings.

Remember that the temp split between return to supply will change with varying conditions.