Endress+Hauser Waterpilot FMX21 submersible pressure sensor

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The Waterpilot FMX21 is a high-precision, robust submersible pressure sensor for hydrostatic level measurement, in fresh water, wastewater and salt water.

The 4-20 mA signal with superimposed HART 6.0 output allows the operator to adjust parameters and solve problems remotely either using the Field Xpert PDA configuration tool or via any FDT/DTM-based application like PACTware or FieldCare. Significant spares optimisation and cost benefits are derived from the HART capability, as a single range of FMX21 can be configured for different level measurement requirements.

Measured errors of up to 3% arising from fluctuations in the water density due to temperature can automatically be compensated by using either an optional internal Pt100 temperature sensor, or an external temperature sensor connected to the FMX21 in HART burst mode.

For water and wastewater applications, the Waterpilot has a 316L stainless steel housing and carries international drinking water approvals. A PPS coated version is suited for use in aggressive environments, such as salt water. Completely potted electronics and a 2-filter atmospheric pressure compensation protects the sensor against water diffusion. Reliability is further enhanced by the robust flush-mounted ceramic sensor which can be cleaned without the risk of damage or losing calibration.

The IEC Exia certified FMX21 has a reference accuracy of up to ±0.1% and is suitable for measuring level ranges up to 200 mH₂O (20 bar). It comes with a high-resistance polyurethane cable that can be marked at customer-specified lengths.

The FMX21 can also be ranged to suit any water table depth, thereby reducing costs since ‘one size fits all’.