How to configure the LGF-PA66 with an EC32 RTU for a DMA district metering point? Which communication protocols are supported?

The standard DMA district metering point is an LGF-PA66 magnetic flow meter plus an EC32 RTU plus minimum-night-flow analysis on the platform side. There are two wiring options: connect the LGF-PA66 RS485 port to the EC32 serial port over shielded twisted pair running Modbus RTU (default 9600bps, 8N1), or feed a 4-20mA analogue signal into an EC32 AI channel. For long cable runs prefer the digital link — better noise immunity, and it also exposes totaliser, empty-pipe alarms and other diagnostics.

Configuration points:

• Addresses and registers: when several LGF-PA66 meters share one RS485 bus, assign each a distinct slave address, poll instantaneous and totalised flow registers, and verify the unit scaling factors.
• Acquisition strategy: set the EC32 to sample every minute and report every 15 minutes. The 2:00–4:00 minimum-night-flow window must never be skipped — it is the core input for leakage analysis.
• Connectivity: the EC32 supports 4G Cat.1 and NB-IoT. In underground valve chambers with weak signal, order the external-antenna version and route the antenna to the chamber mouth.

On the platform, alarm thresholds are set against the baseline of minimum night flow, combined with district pressure data to locate leaking pipe sections. Meter sizes follow the district main — commonly DN80 to DN300 — with flange standards matched to the existing network.

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