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Waterpilot FMX21 – product picture

Waterpilot FMX21 - hydrostatic level probe

Reliable hydrostatic level measurement for drinking water, wastewater and saltwater applications

FMX21
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5-year warranty

Engineered for Confidence

Our Fundamental Selection instruments feature an extended 5-year warranty – a clear testament of our trust in their long-term reliability and performance.

Should a warranty case occur, you can count on a fast replacement process and minimal administrative effort – giving you peace of mind when it matters most and helping you keep your operations running smoothly.

Warranty terms apply

The extended warranty is subject to specific conditions. For full details, please refer to the locally applicable General Terms and Conditions (GTC), which can be found on the respective country page of our website.

Waterpilot FMX21 with stainless steel housing for drinking water applications
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Detail view of Waterpilot FMX21 with stainless steel housing for drinking water applications
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Waterpilot FMX21 with stainless steel housing for wastewater applications
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Waterpilot FMX21 with plastic insulation for saltwater applications
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Specs at a glance

  • Accuracy

    0.2%
    0.1% (optional)

  • Process temperature

    -10°C...70°C
    (14°F...158°F)
    Diameter 29 mm (1.14"): 0°C...50°C
    (32°F...122°F)

  • Pressure measuring range

    100 mbar...20 bar
    (1.5 psi...300 psi)

  • Main wetted parts

    Diameter 22 mm and 42 mm: Seal, 316L, Ceramic
    Diameter 29 mm: Seal, PPS, Polyolefin, Ceramic
    Extension cable: PE, PUR, FEP

  • Max. measurement distance

    200 m H2O
    (656 ft H2O)

  • Measuring cell

    100mbar...20bar
    (1.5psi...300psi)

Field of application

Waterpilot FMX21 is a robust hydrostatic level probe featuring an oil‑free capacitive ceramic measuring cell for stable and accurate measurement results. Freely adjustable measuring ranges can be configured via HART, enabling flexible adaptation to different process requirements in drinking water, wastewater and saltwater applications. An optionally integrated temperature sensor enables simultaneous measurement of level and temperature.

Available in three versions for drinking water, wastewater and saltwater applications, Waterpilot FMX21 is supported by international explosion protection certificates, marine and drinking water approvals. It is suitable for use in a wide range of applications, including:

  • Deep and narrow drinking water wells and boreholes

  • Process and storage tanks in water and wastewater applications

  • Saltwater and marine tanks, e.g. ballast water tanks

  • Rivers, lakes and reservoirs for environmental monitoring

Benefits

  • Robust design with an oil-free capacitive ceramic measuring cell for long‑term operation

  • Easy system integration and flexible parameterization via HART communication

  • Geometry‑independent hydrostatic level measurement, ideal for deep, narrow boreholes and wells

  • Compliance with international explosion protection certificates, marine approvals and drinking water certifications

  • Optionally integrated temperature sensor enables temperature‑compensated density correction for high measurement accuracy

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