500 slm DryCal® Technology Piston Prover Tested at NIST

Harvey Padden

President

At Bios, we’re constantly working to make high quality primary gas flow measurements faster, simpler and more precise. We’ve been pretty successful, as evidenced by our 0.15% Met Lab Series of high-speed piston provers. Now, we are developing a 0.15% DryCal Technology based prover for flows up to 500 slm.

As a cooperative research experiment, we took a prototype to NIST in order to test its linearity against their sonic nozzle flow standards. Taking a large number of readings at six flows from 10 slm to 500 slm, we established that our linearity agrees with NIST to about ± 0.05%. We did a second run and found that we could reproduce our results to better than ± 0.05% as well.

Since linearity was the largest variable in our overall accuracy, we’re now confident in our plans to extend the Met Lab Series to 500 slm. Please let us know if you want us to keep you informed of our progress and send you our technical papers when they are presented.

Comments

[Ed Webster]

Great job, all! This update should generate some interest!