Endress+Hauser FMX21-AA251FGD10A Waterpilot FMX21 Precision Hydrostatic Level Sensor

In Stock & Ready to Ship: The Endress+Hauser FMX21-AA251FGD10A is a high-performance hydrostatic level probe designed for continuous level measurement in liquids. Part of the renowned Waterpilot FMX21 series, this specific model combines the ruggedness of a ceramic measuring cell with the intelligence of HART communication, making it the ideal choice for environmental applications, water/wastewater treatment, and industrial process control. Leveraging oil-free, capacitive ceramic technology, this submersible pressure sensor delivers unparalleled long-term stability and accuracy even in the toughest conditions .

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Product Overview: Endress+Hauser Waterpilot FMX21

The Waterpilot FMX21 sets the standard for submersible level measurement. Unlike traditional oil-filled sensors, the FMX21 features a 99.9% high-purity ceramic measuring cell that is inherently resistant to overload and aggressive media . The specific configuration FMX21-AA251FGD10A is a popular variant tailored for saline water and demanding environments, ensuring that you receive a device that is ready for immediate installation out of the box.

Key Technical Specifications (FMX21-AA251FGD10A)

Understanding the technical details is crucial for procurement and engineering. Below are the specifications for this exact model based on the ordering code breakdown .

Model Number: FMX21-AA251FGD10A

Certification (AA): Non-hazardous area; standard version for general applications .

Output (2): 4-20 mA with HART 6.0 protocol. Allows for flexible scaling, remote diagnostics, and density-compensated level measurement .

Measuring Cell / Probe Design (5): Diameter 29mm with PPS/Polyolefin coating. This specific housing is made of robust 316L stainless steel with a protective coating, designed explicitly for use in saltwater, brine, and ballast water tanks .

Measuring Range (1F): 400 mbar / 40 kPa / 4 mH₂O (13 ftH₂O) . Perfectly suited for lift stations, tanks, and wells with moderate depth .

Reference Accuracy (G): ±0.2% of the set span. For higher precision, optional "Platinum" models (0.1%) are available, but this standard version offers industry-leading accuracy for most applications .

Calibration/Units (D): Sensor calibrated in metric units (mH₂O) for ease of use .

Cable / Connection (10): 10 meters (approx. 33 ft) of PE cable. This durable polyethylene cable is supplied with integrated ventilation and can be shortened as needed .

Seal Material (A): FKM Viton. Offers excellent chemical resistance and durability in the wetted parts .

Process Temperature: -10 to 70°C (14 to 158°F) .

Power Supply: 10.5 to 35V DC .

Why Choose the Waterpilot FMX21? (Benefits & Advantages)

To ensure your content is comprehensive and ranks for buyer intent, here are the distinct advantages of this specific probe:

1. Oil-Free Ceramic Sensor Technology

The capacitance-based ceramic sensor (Ceraphire®) offers extreme robustness. It is virtually impervious to abrasion and features overload resistance up to 40 times the nominal pressure. Because there is no oil filling, there is no risk of process contamination if the diaphragm is damaged—a critical factor for drinking water and environmental compliance .

2. Climate-Proof and Condensation-Free

Traditional sensors often fail due to moisture in the cable or electronics. The FMX21 features fully potted electronics and a dual-filter pressure compensation system. This prevents humidity and condensation from compromising the measurement signal, ensuring reliability in deep wells or submerged applications where sensors are exposed to temperature swings .

3. Integrated Temperature Compensation (Pt100)

This model supports an optional built-in Pt100 temperature sensor (depending on final configuration settings), allowing for simultaneous level and temperature measurement. The HART protocol enables automatic density correction, which compensates for temperature-induced density changes in the liquid, providing true mass or volume measurement rather than just raw pressure values .

4. Multi-Purpose Design

With a 29 mm diameter coated body, the FMX21-AA251FGD10A is optimized for saltwater but is versatile enough for:

Environmental monitoring (rivers, lakes, reservoirs)

Marine applications (ballast tanks with ship approvals available)

Wastewater and sludge (robust enough to handle heavy solids) .