Endress+Hauser Waterpilot FMX21 Level Transmitter

Fits drinking-water, wastewater, and marine hydrostatic level loops that need an oil-free ceramic measuring cell probe (Waterpilot FMX21) with 4–20 mA HART.

Key advantages

Oil-free ceramic cell — Hydrostatic level probe without oil fill.
100 mbar…20 bar — About 1.5…300 psi; max distance ~200 m H2O.
4–20 mA HART 6.0 — Optional integrated Pt100 temperature.
Three diameter versions — 22 mm drinking water; 42 mm wastewater; 29 mm saltwater/marine.

Typical applications

Drinking-water level wells needing KTW/NSF/ACS-class approvals.
Wastewater and process sumps with ceramic hydrostatic probes.
Marine / saltwater tanks with 29 mm version and classification-society marks.

Selection guide

Accuracy — Reference ±0.2%; PLATINUM ±0.1%.
Pressure / level range — 100 mbar…20 bar (1.5…300 psi); max distance ~200 m H2O.
Process temperature — −10…+70 °C (29 mm saltwater version 0…+50 °C).
Output — 4–20 mA with HART 6.0; optional integrated Pt100.
Versions — 22 mm drinking water; 42 mm wastewater; 29 mm saltwater/marine.
Wetted parts — 316L / ceramic / seals; plastic insulation on saltwater version; PE/PUR/FEP cable.
Approvals — Drinking water KTW/NSF/ACS; ATEX/FM/CSA; marine GL/ABS/BV/DNV.

Common mistakes

Specifying FMX10 — OEM current Waterpilot hydrostatic probe in our sources is FMX21.
Mixing diameter versions without matching media and approvals.
Ignoring the narrower 0…+50 °C window on the 29 mm saltwater version.
Leaving cable material (PE/PUR/FEP) and HART/Pt100 options blank on the RFQ.

When to RFQ / what to tell us

Version (22 mm drinking water / 42 mm wastewater / 29 mm saltwater) and required span (mH2O / bar).
Accuracy class (Reference ±0.2% vs PLATINUM ±0.1%), HART need, optional Pt100.
Cable length/material (PE/PUR/FEP), drinking-water or marine marks, quantity, ship-to.

Request a Quote · Get selection help

Specs

Spec	Value
SKU	33978
Brand	Endress+Hauser
Model	Waterpilot FMX21
Product type	hydrostaticleveltransmitter
Type	Hydrostatic level probe with oil-free ceramic measuring cell (Waterpilot FMX21)
Accuracy	Reference ±0.2%; PLATINUM ±0.1%
Pressure range	100 mbar…20 bar (1.5…300 psi); max distance ~200 m H2O
Process temperature	−10…+70 °C (29 mm saltwater version 0…+50 °C)
Output	4–20 mA with HART 6.0; optional integrated Pt100 temperature
Versions	22 mm drinking water; 42 mm wastewater; 29 mm saltwater/marine
Wetted parts	316L / ceramic / seals; plastic insulation on saltwater version; PE/PUR/FEP cable
Approvals	Drinking water KTW/NSF/ACS; ATEX/FM/CSA; marine GL/ABS/BV/DNV
Notes	TI00431PEN + BA00380PEN. OEM current Waterpilot probe is FMX21 (no public FMX10 match).

Documents

FAQ

Q: Is this FMX10 or FMX21? A: Waterpilot FMX21. OEM sources list FMX21 as the current hydrostatic Waterpilot probe; this page does not use FMX10.

Q: Which diameter versions exist? A: 22 mm drinking water; 42 mm wastewater; 29 mm saltwater/marine — match media and approvals on the RFQ.

Q: What should I send for a quote? A: Version, span, accuracy class, HART/Pt100, cable, marks, quantity. Compatible with systems using Endress+Hauser Waterpilot FMX21 — we do not claim authorized-dealer status.