Coriolis mass flow reading variation

Flow Q&A

We have three Coriolis mass flow meters for ethylene, one on the main battery limit and the other two on different reactors. Their meters should match the main battery's meter. Right now, we have one to two tons per kilogram of difference, with the battery limit showing less. Can anybody help me solve this issue?

Expert’s answer: Coriolis mass flow reading variation

As always, you first need to check the installation of the flow meters to figure out any Coriolis mass flow reading variation. Not only do you need to install them following the recommendations, but also you need to confirm that you did the meter zeroing properly. However, most of the time we do not recommend zeroing. We prefer to keep this procedure as a last resort, because if the engineer or tech doing the zeroing makes a mistake, it’ll affect the flow meter measurement.

Flow meters – Copyright Endress+Hauser

Also, you should check the K-factor, if only to make sure it hasn’t changed. We’ve see K-factor problems before where someone changed it and the meter began to read wrong.

Now, using PAM software, a handheld, or the local display, check the device for maintenance or error messages. Last but not least, look for bubbles in the process. Yes, this simple occurrence can affect how the  meter will perform.

Want to learn more about what to do when you get a Coriolis mass flow reading variation?

Companies with Coriolis flow meters:

Other resources that might interest you

Critical spares for plant instruments
How do you design a good critical spares strategy?

Yokogawa ROTAMASS flow direction
Last week our ethylene flow meter suddenly went to zero in the DCS, but the actual flow was normal. We reversed the flow direction, and the flow became normal. Now the actual flow direction is forward, but the transmitter configuration is reversed. What’s going on?

Mass flow of a dry solid material
How do you measure the mass flow of a dry solid material?

Thermal mass flow application
I want to use the t-mass 150 in my process, but I have a question about our application. Our blower runs for about 2 to 5 minutes about every 20 minutes. During the 20-minute intervals, the process won’t have air flow and pressure in the line. Will this have any effect on our vortex flow meter?

Related tags: error Flow flow installation K-factor troubleshooting
Comments
Coriolis mass flow reading variation
Resistors, intrinsic safety barriers, and galvanic isolators
How to check mass flow meters and DP flow transmitters
Can I measure bi-directional flow using vortex flow meters?
Buyer guide: KROHNE OPTIMASS 7400 and Proline Promass I 300
See related devices