I have a liquid N2 closed tank with a DP level sensor. The liquid N2 is vaporized and transferred to another location. We measure the gas using a thermal mass flow meter. After doing the calculation, I got a different total in the meter. Any suspect? I am suspecting the DP level reading is not accurate.

 

You are experiencing a "what time does YOUR watch say?" problem. You are trying to compare two different technologies with two different accuracies, measuring two different physical parameters, and expecting to make soup.

I could go through the long-winded explanation of what you need to do to--but here's the solution. Pick the device you think is more accurate and calibrate the other device to agree with it.

You can't do any better than that in the field.

Walt Boyes
Editor in Chief
Control and ControlGlobal.com
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