Does PA66 Moisture Absorption Affect LGF-PA66 Accuracy?

Unreinforced PA66 does absorb noticeable moisture — a fair concern. The LGF-PA66 uses glass-fibre reinforced PA66, which absorbs far less water and holds its moulded dimensions well.

More importantly, the wetted parts of an electromagnetic flow meter are only the PTFE liner and the electrodes; the medium never touches the PA66 body. The body provides structural support and locates the magnetic circuit — minor dimensional change from moisture uptake does not alter the measuring bore or the induced voltage signal.

The IP68 rating is designed for long-term immersion in the first place: flooded valve pits and rain-soaked outdoor installations are design scenarios, so humid-air absorption sits well inside the engineering margin. Units are running year-round in humid southern valve pits and coastal high-salt-spray sites.

What genuinely needs attention: strong oxidising acids (concentrated sulphuric, nitric) must be reviewed with the technical team before selection, and high-chloride media call for Hastelloy or titanium electrodes. Neither issue relates to moisture.

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