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  • Products
    • Defender 510 & 520
    • Defender 530+
    • FlexCal Series
    • DryCal Metrology Series
      • DryCal 800
      • DryCal 1020 & 1500
      • Integrator Pro
      • Gas Flow Benches
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    • Industrial Hygiene
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    • Documents & Manuals
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Reduce Errors During Flow Measurements

July 7, 2016Gas Flow Calibration BlogBy Kera Tucker

DryCal Connecting Volume

One of the easiest ways to reduce errors during flow measurements is to lower the connecting volume between the calibrator and the device under test. Mesa Laboratories piston provers were designed to minimize connecting volume effects, but reducing the connecting volume proportionately reduces measurement errors.
If lowering the connecting volume is not possible, adding a backpressure regulator may also lower effects from large connecting volumes. Flow measurements can also be corrected for connecting volume using pressure, volume and measured flow rates (see equation below).

Connecting Volume Equation

Fcor = flow corrected for connecting volume
F = measured flow
P2= gas pressure at end of gas flow measurement interval
Pa = standardizing or ambient gas pressure
P1 = gas pressure at beginning of flow measurement interval
Vconn = estimated minimum connecting volume

For a more detailed application note regarding errors and connecting volumes, take a look at Mesa Lab’s “What You Should Know about Connecting Volume” document.

Let’s talk DryCal!

Talk with one of our experts to get your questions answered and see how we can help you solve your calibrator pain points.


backpressureconnectingconnecting volumeerrorsflow measurementsflow rates
About the author

Kera Tucker

Kera Tucker is Mesa’s BGI/DryCal/DialyGuard Product Manager. She spearheads product development and renovations for Mesa’s flow calibration, environmental monitoring and dialysate meter product lines.

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