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What are some special considerations when trying to measure a dew point below -40C?

April 26, 2017considerations dew measure point special

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What are some special considerations when trying to measure a dew point below -40C?

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When measuring below -40C, use stainless steel material (tubing, fittings, etc), recommended flow rate is 1-3 SCFH, pump and flow meter should be mounted downstream from the sensor, and minimize the amount of fittings used (source of leaks).