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Thread: Seemingly wrong PT relationship
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28-06-2012, 01:59 PM #1
Seemingly wrong PT relationship
Hi.
I have this 28 oz can of r410a at room temperature of 77F.
When I connect a gauge to it, I measure 258 psig.
The r410a PT chart says I should have 226 psig at 77F.
What am I missing?
Thanks.
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28-06-2012, 06:33 PM #2
Re: Seemingly wrong PT relationship
The compariter - PT chart is correct so.
Either
Your gauge
Your thermomiter
or
The refrigerant is out.
If you thermomiter and gauge is ok you do not have R410A.
410 is a Zeotrope and it will fractionise (seperate) if it has had a
leak in the past or if the thing was vented.
I personaly would check my gauges and thermomiter for accuracy.
Regards
Rob
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28-06-2012, 07:35 PM #3
Re: Seemingly wrong PT relationship
Did you measure the vapour or liquid temperature?
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29-06-2012, 01:26 PM #4
Re: Seemingly wrong PT relationship
I measured the liquid temp, because I put my probe below the line. That is, as far as I can guess where the line is inside an opage can filled at 80% capacity.
Thanks all for your time.