Product Overview
E+H Waterpilot FMX11 Hydrostatic Level Transmitter
Waterpilot FMX11
The Endress+Hauser Waterpilot FMX11 is a compact, submersible hydrostatic level transmitter engineered for continuous level measurement in clean water, groundwater, and wastewater sumps. Featuring an outer probe diameter of just 22 mm (0.87 in), built-in climate-proof pressure compensation, and an IP68 hermetically sealed stainless steel body, it provides high long-term stability and effortless installation in tight boreholes and deep wells.
Continuous Hydrostatic Level Measurement with Endress+Hauser Waterpilot FMX11
The Endress+Hauser Waterpilot FMX11 is a reliable and compact hydrostatic level transmitter designed for continuous level monitoring in freshwater applications, groundwater abstraction, deep wells, and municipal water management. Engineered to perform in narrow boreholes, storage basins, and river gauging stations, the FMX11 provides an economical yet highly accurate solution for hydrostatic pressure and liquid height evaluation.
Slim-Line Submersible Design & Reliable Sensing Technology
Built with a slim 22 mm (0.87 in) outer diameter, the Waterpilot FMX11 is specifically tailored for installation in small-diameter pipes, deep well casings, and restricted mounting locations. Operating on the hydrostatic pressure principle, the transmitter features a piezoresistive measuring cell with a robust ceramic diaphragm. The hydrostatic head pressure exerted by the fluid column above the sensor is directly converted into an industry-standard 2-wire 4–20 mA current output signal. Atmospheric pressure shifts are compensated via an integrated breathing capillary built into the suspension cable, ensuring immune, drift-free level readings.
Key Features & Technical Advantages
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Slim 22 mm Outer Diameter: Fits effortlessly into 1-inch well pipes, narrow gauge tubes, and tight environmental monitoring wells.
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Hermetic IP68 Submersible Enclosure: Heavy-duty 316L stainless steel body potted and sealed for continuous underwater deployment up to 20 meters (66 feet) gauge depth.
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Integrated Capillary Pressure Compensation: Internal air tube in the extension cable balances atmospheric pressure shifts, guaranteeing accurate hydrostatic pressure measurement.
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Drinking Water Certified: Complies with international health and drinking water hygiene approvals (ACS, KTW, NSF) for safe use in potable water reservoirs and deep wells.
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Durable Extension Cable: Heavy-duty, strain-relieved cable options (polyethylene/PE) with high tensile load capacity to support deep vertical installations.
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Simple 2-Wire 4–20 mA Output: Direct analog output signal compatible with standard panel meters, data loggers, PLCs, and remote telemetry units (RTUs).
Dependable Performance in Environmental & Municipal Water Systems
Whether deployed in municipal drinking water storage towers, surface water monitoring channels, or agricultural irrigation sumps, the Waterpilot FMX11 maintains high accuracy and long-term measurement stability. Its solid-state ceramic measuring cell resists mechanical shock and overpressure surges, providing continuous level control with minimal maintenance requirement.
Applications
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Groundwater & Environmental Monitoring: Deep wells, borehole water table measurement, observation wells, and river water gauging.
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Drinking Water Infrastructure: Potable water reservoirs, elevated storage tanks, water treatment basins, and clearwater sumps.
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Municipal Wastewater & Utilities: Rainwater retention basins, storm overflow channels, drainage pits, and raw water intake stations.
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Agriculture & Irrigation: Water storage ponds, irrigation wells, livestock watering tanks, and canal level tracking.
Technical Specifications
| Parameter / Feature | Specification Details |
| Measuring Principle | Hydrostatic level measurement (Submersible) |
| Measuring Cell Type | Ceramic piezoresistive cell |
| Measuring Ranges | 0 to 2 mH2O up to 0 to 20 mH2O (0 to 200 mbar up to 0 to 2 bar) |
| Measurement Accuracy | ±0.35 % or ±0.5 % of set upper range limit |
| Probe Diameter | 22 mm (0.87 in) |
| Process Temperature | -10 °C to +70 °C (+14 °F to +158 °F) |
| Process Pressure (Abs.) | Max. 6 bar (87 psi) overload limit |
| Output Signal | 2-wire, 4–20 mA analog output |
| Wetted Materials | 316L Stainless Steel (1.4404), Al2O3 Ceramic, PE Cable |
| Ingress Protection | IP68 (NEMA 6P) – Continuously submersible |
| Drinking Water Approvals | ACS, KTW, NSF (Potable water compliant) |
FAQ
Q1: What is the outer diameter of the Waterpilot FMX11 probe?
Answer: The Waterpilot FMX11 features an outer probe diameter of 22 mm (0.87 in), making it compact enough to fit inside 1-inch pipes and narrow groundwater monitoring wells.
Q2: How does the FMX11 compensate for atmospheric pressure changes?
Answer: The transmitter extension cable contains an internal capillary tube that vents the back of the ceramic measuring cell to atmospheric pressure, automatically canceling out ambient barometric changes.
Q3: Is the Waterpilot FMX11 suitable for drinking water applications?
Answer: Yes, the FMX11 is tested and certified according to international drinking water standards (such as ACS and KTW) for safe use in potable water storage and deep wells.
Q4: What is the maximum measurement depth for the FMX11?
Answer: The FMX11 supports hydrostatic measuring ranges up to 20 mH2O (2 bar), with continuous IP68 submersion protection.
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