Expert’s answer: How to check mass flow meters and DP flow transmitters

We have many ways to make sure your meters work properly, although  procedures can change a bit depending on the working principle. I used to check problematic instruments in the field, and many times my clients didn’t scale out or install the devices correctly. My colleagues also shared similar experiences. Simply put, a bad scale-out or improper installation means a device will never work as it should.

With that in mind, you need to review your installation first. Most devices have minimum inlet and outlet runs. You may have to factor in your product and process conditions to determine the length of your runs, the position of your transmitter and other issues. You may also need external items like orifice plates or pitot tubes. If you’re not sure about any of these things, then check your manual.

image of DP transmitter flow meters
Courtesy of Endress + Hauser

A differential pressure (DP) flow meter has a mechanical structure that also needs review, like leaks in the seal pot. Fortunately, today’s smart devices usually have self-diagnostics that give enough data to learn what’s happening with the device.

If you don’t have any sort of diagnostics, you need to look at the big picture. Examine the device’s behavior in different scenarios in the application and analyze your product and configuration. When possible, use a clamp-on flow meter for comparison. It will give you a better view of the situation so you can figure out the problem.

These articles will tell you more about flow meters:

Orifice plate or vortex for steam flow meter?

Expert Answer : “I need a new flow meter for steam measurement. I know we can use a vortex flow meter or an orifice plate. Which do you recommend?” The answer is in the article !

The best flow meter: What you need to know

Expert Answer: “What’s the best magmeter? I have a simple application and I am looking for the best flow meter for my application, could you help me?”The answer is in the article !


Recommended articles