Mass flow meter, pulse output, accumulation
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The pulse output from the Emerson mass flow meter does not show cumulative flow on the DCS, but it does display cumulative changes in volume and mass flow on the gauge? This issue with the flow meter occurred during operation after it was sent for inspection; it was working normally before that
First, is the real-time traffic display of your DCS normal? If it’s normal, check your data usage accumulation block
Is the cumulative function for flow blocks on DCS not enabled? ? ?
The settings for pulse accumulation are different in DCS; have they been set?
The flow accumulation function in DCS needs to be configured; it is essentially an accumulation counting function based on addition, and it is necessary to set it up. Or digital communication can be used to transmit the cumulative amount directly.
Based on your description, the possibility of a fault in the flow meter’s output is relatively low; it was functioning properly before, and pulse signals are typically used for calibration purposes. . First, confirm whether the wiring is correct; it seems highly likely that there is a wiring issue. Then verify the DCS system-related configurations. The flow meter’s pulse/frequency output can be simply verified using a multimeter that supports frequency measurement functions.