Endress+Hauser FMX21-AA121HGD15A+POPS Hydrostatic Level Probe

The Endress+Hauser Waterpilot FMX21-AA121HGD15A+POPS is a hydrostatic level probe designed for continuous liquid level measurement. The FMX21 family is used in drinking water, wastewater, saltwater, wells, tanks, reservoirs, pumping stations, and other water-management applications. Its submersible design measures hydrostatic pressure and converts that pressure into a reliable level signal for monitoring and control systems.

Product overview

According to Endress+Hauser product information, the Waterpilot FMX21 uses an oil-free capacitive ceramic measuring cell. This measuring principle supports stable hydrostatic level measurement in demanding water applications. The probe can be installed below the liquid surface, while the connected cable provides the electrical connection to the associated instrumentation or control system.

Typical applications

• Continuous level monitoring in water tanks and reservoirs
• Drinking-water storage and distribution systems
• Wastewater collection, pumping, and treatment facilities
• Level measurement in wells and boreholes
• Saltwater and general water-management projects
• Maintenance or replacement of an installed FMX21 probe

Why the complete order code matters

Waterpilot FMX21 probes can be supplied in different configurations. Buyers should therefore specify the complete code FMX21-AA121HGD15A+POPS rather than requesting only an FMX21. The configured measuring range, probe cable length, electrical output, process connection, approvals, materials, and accessories may differ between order codes. Matching the complete code helps reduce identification errors and supports a more accurate quotation.

Information to confirm before ordering

For a replacement or new project, send a clear photograph of the original nameplate and confirm the following information:

• Complete order code and serial number
• Required measuring range and engineering unit
• Probe cable length and installation depth
• Electrical output, power supply, and system interface
• Medium, operating temperature, and installation environment
• Mounting accessories and cable suspension requirements
• Required approvals, certificates, and documentation
• Quantity, delivery destination, and required condition

Support for industrial buyers

This listing is intended for industrial procurement teams, maintenance engineers, system integrators, water-treatment operators, and equipment resellers sourcing an Endress+Hauser hydrostatic level sensor. Providing the full model, nameplate image, application details, and required quantity allows the requested configuration to be reviewed before supply.

For planned maintenance, buyers should also compare the existing installation drawings, wiring information, cable routing, mounting position, and connected display or controller. These checks help determine whether the requested probe fits the mechanical installation and communicates correctly with the existing measurement loop.

Frequently asked questions

What does the Waterpilot FMX21 measure?

It measures hydrostatic pressure to determine the liquid level above the submerged probe.

Can another FMX21 directly replace this model?

Not automatically. The measurement range, cable, output, materials, approvals, and accessories must match the installation requirements.

What is needed for a quotation?

Please provide model FMX21-AA121HGD15A+POPS, quantity, nameplate photograph, cable length, measuring range, medium, destination, and any required certificates.

Request a quotation

Contact us for availability and quotation support for the Endress+Hauser FMX21-AA121HGD15A+POPS hydrostatic level probe. Availability, condition, supplied configuration, and compatibility are subject to confirmation. All trademarks and product names belong to their respective owners.