Yokogawa ROTAMASS flow direction

Flow Q&A

Hello. Do you have any experience with ROTAMASS? 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?

Expert’s answer: Problem with Yokogawa ROTAMASS flow direction?

Just to recap, you’re experiencing some problems with the Yokogawa ROTAMASS flow direction.

No worries, we can help with that. It’s not a big issue, but you should check your device setup in your distributed control system. So, start with the flow meter’s physical installation. Note that if you installed it wrong, the measurements will be off and subsequently, the configuration won’t make sense.

Here, we have a flow meter with a direction indicator:

Yokogawa Coriolis

Next, look at the configuration, specifically the “flow direction function.” There you can set the measurement for forward or reverse. In Section 7.17 of the manual, you’ll find that ifReverse is selected, the flow direction in the other direction of the arrow on the detector is used as positive values of flow.”

At last, check the flow direction for each type of output. As you can see below, several factors can affect your output.

Pulse 1 select  for forward flow and reverse

Now, if you need more help, it’s may be time to revisit the old user manual.

Want to learn more about Coriolis flow meters?

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