Conductivity sensor operating on the inductive measuring principle
The measuring cell is a smooth, hermetically sealed body made of PEEK with a bore for the medium to flow through. The bore is surrounded by two coils: a primary coil with AC voltage and a secondary coil which receives a small , medium-induced voltage signal. The signal strength depends on the medium conductivity. The signal is electronically amplified to a linear, analog 4 ... 20 mA output signal. The Pt100 sensor installed in the tip detects the media temperature to enable temperature compensation of the typically temperature-dependent measured conductivity. The Pt100 signal is also provided as analog 4...20-mA output signal. Both coils and sensor are accommodated in the PEEK sensor housing with a surface roughness of (Ra) < 0.8 μm. This way, the conductivity sensor is perfect in hygienic processes or for aggressive media contact, such as acid or lye.
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