What Is the Minimum Flow Rate of DN15/DN25 LGF-PA66 Flow Meters?

The lower velocity limit determines the minimum measurable flow. The LGF-PA66 measures stably down to 0.1 m/s with a turndown ratio of up to 50:1. Converted to common small sizes:

• DN15: minimum approx. 0.06 m³/h;
• DN25: approx. 0.18 m³/h;
• DN50: approx. 0.71 m³/h.

These sizes cover low-flow duties such as chemical dosing lines, laboratory water supply and secondary distribution branches. Keep the normal duty point between 30% and 70% of full scale; avoid continuous operation below 20% — the induced signal becomes weak and readings drift.

Unlike full-scale error specifications, the ±0.5% (DN50-100) accuracy of the LGF-PA66 is reading-based, so relative error stays controlled at low flow. The moulded PA66 body with PTFE liner keeps the bore smooth and scale-resistant — critical at small diameters, where liner deposits directly constrict the flow path and add error.

For remote sites without mains power, pair the meter with a Hero V9 EC32 RTU: data reporting over 4G/NB-IoT into the smart water platform, where totalisers and low-flow alarms are configured.

For more details, visit our product pages or contact the technical team.