How to calibrate dial manifold guages

[JJDH]

I have a new set of 4 valve cps gauges. I have been told numerous times the way to calibrate is to connect to a jug of r22 or 410a, tape a thermocouple to a jug of said refrigerant and match the saturation temp to the thermocouple temp. When I did this the gauges no longer read zero. I'm just looking for re assurance and confirmation of this method. This set was 180.00 and it drives me mad. I don't want to spring for digital just yet.

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[Ed Janowiak]

You just described the difference between zeroing a gauge and calibrating a gauge, nice job. :det:

[gonefishing]

That is the best way to calibrate. They are then calibrated to the range you
will be using them in. Otherwise they will be calibrated to read an accurate 0psig.










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[JJDH]

Thanks for the response gents. I'm gonna eventually get the sman3... I find myself being more and more picky about accuracy.. this manifold won't last :

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[itsiceman]

That is the best way to calibrate. They are then calibrated to the range you
will be using them in. Otherwise they will be calibrated to read an accurate 0psig.










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[AccurateHT]

tape a thermocouple to a jug of said refrigerant and match the saturation temp to the thermocouple temp.

In order to use this method, the tank and all of its contents must be at exactly the temp measured by the thermocouple. This means keeping the jug at the same temp for 24 hours and insulating the thermocouple, provided your thermocouple is accurate.

[JJDH]

10-4. I think I was second guessing it only because the new set don't read zero after calibration.

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[hvaclover]

i jus' likes the dickens outta my SMAN 3 an' Testo 557.

[chuckcrj]

Also, make sure you calibrate the thermocouple in ice water first.




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