A reader asked us if changing a discharge line pump on the same line as an electromagnetic flow meter from three to four inches will require a new flow meter as well. Here’s our answer:

You may not need to change your flow meter to change the line size but you’ll definitely need to scale it out to the new process conditions. After you scale out, if the pressure drop falls below your meter’s threshold, then you should shop for a new meter.

To check the operation of your flow meter, use another flow measurement device, for example, a clamp-on ultrasonic flow meter. Attach the second flow meter next to the inline electromagnetic flow meter you want to check and compare the values.

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