What conductivity does an electromagnetic flow meter require? What is the minimum conductivity the LGF-PA66 can measure?

An electromagnetic flow meter can only measure conductive liquids — by principle, the medium itself acts as the moving conductor that cuts magnetic field lines. The LGF-PA66's lower limit is 5 μS/cm; below that the induced signal is too weak for stable measurement.

Reference values for common waters:

• Municipal tap water: 200–800 μS/cm — far above the limit; the ideal medium for electromagnetic meters.
• River and reservoir raw water: 100–500 μS/cm — measures normally.
• Domestic sewage and industrial wastewater: typically above 1000 μS/cm — ample signal.
• Seawater: ~50,000 μS/cm — LGF-PA66 with Hastelloy electrodes is the standard configuration.
• Pure, deionized, or distilled water: 0.1–5 μS/cm — below the limit; electromagnetic meters cannot be used and another principle is required.

When site conductivity sits near the limit (5–20 μS/cm), choose the split-mount version to keep the signal cable short, and run a zero calibration with a flooded pipe before commissioning. The LGF-PA66's wide conductivity window lets one meter cover media from raw water to seawater while holding ±0.5%（DN50-100） accuracy. If the medium's conductivity is unknown, measure a sample with a portable conductivity meter — that beats any rule of thumb.

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