What is the response time of the LGF-PA66 electromagnetic flow meter and how should damping be set for fluctuating flows?

The LGF-PA66 aviation-grade composite electromagnetic flow meter uses low-frequency rectangular-wave excitation. Sensor response time is typically under one second, and the transmitter updates the measurement at the 0.1-second level — fast enough to follow flow changes during valve operations or pump starts.

When the process flow itself fluctuates heavily (pump discharge pulsation, intermittent supply), a fast response only reproduces the noise in the reading. Set the damping time constant on the transmitter front panel or via a Modbus register. Field practice:

• Custody transfer and totalizing: 3–10 s damping for stable readings;
• Process control and PID loops: 1–3 s to balance response and stability;
• Leakage detection and transient capture: damping at 0, paired with an EC32 RTU sampling at high frequency to preserve transient details.

After adjusting, watch the instantaneous flow: readings are acceptable when the fluctuation stays within about ±1% of full scale. If it does not, check the line for entrained air or pump cavitation instead of adding more damping — damping only smooths the display and output signals, not the measurement itself. The ±0.2% linearity and ±0.5% accuracy class (DN50–DN100) of the LGF-PA66 are unaffected by the damping setting.

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