Official Blog of Sierra--Let's Talk Flow!


Subscribe to our mailing list to get news about new products, application stories, & more!

Measure Natural Gas Energy Accurately with Thermal Flowmeters

Dec 07, 2011

It is well known that thermal mass flow meters are effected by gas composition.  Because thermal mass flow meters are effected by gas composition, many customers are concerned about how composition changes effect overall system accuracy.

Through many years of experience with gas mixtures, we have seen that in many cases, a thermal mass flow meter is a superior method of measuring natural gas, even when changes in composition are encountered.  What we have found is that in many respects, our patented Dry-Sense sensor is measuring the “energy content” of the gas.

Gas suppliers in general change compositions due to seasonal constraints, or availability of different sources of gas, but because they are focused on supplying a certain energy content, and our sensor is very sensitive to energy content, the mass flow meter readings remain accurate, even when the composition changes.

Be sure to check out our sub-metering infographic to find out the secret to slashing your facility’s natural gas bills.

John, Chief Engineer
Written By:
John, Chief Engineer
Sierra Instruments

Response to Measure Natural Gas Energy Accurately with Thermal Flowmeters
  1. Avatar

    I encountered the same questions from many Engineering companies and Contractors.
    Most thermal meter I’ve sold is either a check meter or non-custody applications like flare, waste gas, etc. The check meter is always compared with other custody meter like DP, Ultrasonic, Coriolis, Turbine. The monthly billing matches, with % different less than 1%.

    Theoretically its true. But in practice, I can’t justify if there is any effect.

Leave a Reply

Your email address will not be published. Required fields are marked *

Report Bug
Submit a Bug Report



Reproducibility (Did you try to reproduce the bug?)


Summarize the problem but be specific enough that it can be recreated.

Note: Page, browser, and OS are automatically saved