Title

Try searching by key words, order- or product code or serial number e.g. “CM442” or “Technical information”
Enter at least 2 characters to start the search.

Waterpilot FMX21 - hydrostatic level probe

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

Office situation support
Have questions about this product?

Waterpilot FMX21 - hydrostatic level probe

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

Get a quote

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
FLEXible answers to individual needs
Current product

Waterpilot FMX21 - hydrostatic level probe

F
L
E
X
  • Simple products
  • Easy to select, install and operate

What is FLEX?

FLEX selections
Technical excellence
Simplicity
F
L
E
X
Fundamental selection Meet your basic measurement needs
F
L
E
X
Lean selection Handle your core processes easily
F
L
E
X
Extended selection Optimize your processes with innovative technologies
F
L
E
X
Xpert selection Master your most challenging applications
Variable
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.

Services by your side

Right‑first‑time commissioning, worldwide

Endress+Hauser’s qualified service engineers ensure your measurement devices are commissioned right the first time, delivering application‑aligned accuracy, regulatory compliance, and operational confidence from startup onwards, anywhere in the world.

Remote support you can trust wherever you operate

With Endress+Hauser Smart Support, you benefit from faster issue resolution, higher uptime, reliable global expertise across the entire product lifecycle – and lasting peace of mind.

Committed to long‑term, sustainable performance

With deep field expertise, harmonized processes, and continuous monitoring, we accompany you with comprehensive service offerings – from initial start‑up through instrumentation maintenance to process optimization – as a true lifetime partner delivering improved outcomes.

For additional information, please contact your local Endress+Hauser representative.

Learn more

24/7 customer portal

Personalized transaction space

Check prices and delivery times, save your favorite products, create quotes and place orders in just a few clicks and track deliveries at any time. With access to your complete order and quote history including all relevant documents you benefit from full transparency throughout the entire process.

Easy access to technical documentation

Select and download all technical documentation such as operating manuals, calibration certificates, approvals and CAD drawings conveniently bundled as a complete documentation package for your entire order or quote.

My Endress+Hauser – all in one place

My Endress+Hauser is your 24/7 connection to Endress+Hauser – in the office, in the field or on the go. It brings together transaction management, documentation and software downloads, knowledge base access, customer support, engineering tools and cloud‑based IIoT services helping you work easier, faster and more efficiently.

Register now / Log in

Save to list *Saved to list
Office situation support
Have questions about this product?

Product information

Waterpilot FMX21 – product picture
Waterpilot-FMX21
Specifications
Pressure
No results found Try adjusting your search terms to see more results.
Description

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.

Field of application

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
Predecessors
Downloads
Most downloaded
Technical Information (TI)
TI Waterpilot FMX21 Hydrostatic level measurement
English version - 03/2026
Download
Operating Instruction (BA)
BA Waterpilot FMX21 Hydrostatic level measurement
English version - 03/2026
Download
Operating Instruction (BA)
BA Waterpilot FMX21 Hydrostatic level measurement
English version - 03/2026
Download
The CAD Drawings will be available after the configuration.
All downloads
82 Downloads
Technical Information (TI)
Most downloaded
TI Waterpilot FMX21 Hydrostatic level measurement
English version - 03/2026
Download
Operating Instruction (BA)
Most downloaded
BA Waterpilot FMX21 Hydrostatic level measurement
English version - 03/2026
Download
Operating Instruction (BA)
BA Waterpilot FMX21 Hydrostatic level measurement
English version - 03/2026
Download
Short Instruction (KA)
KA Waterpilot FMX21 HART Hydrostatic level measurement
English version - 11/2022
Download
Short Instruction (KA)
Waterpilot FMX21 Hydrostatic level measurement
English version - 11/2022
Download
Short Instruction (KA)
Waterpilot FMX21 Hydrostatic level measurement
English version - 11/2022
Download
Short Instruction (KA)
KA Waterpilot FMX21 Hydrostatic level measurement
English version - 11/2022
Download
Installation Instructions (EA)
Suspension clamp Waterpilot
English version - 01/2023
Download
Installation Instructions (EA)
Pressure adapter Installation instruction Deltapilot M, Deltapilot S, Waterpilot
English version - 04/2012
Download
Ex Safety Instruction (XA)
Waterpilot FMX21 ATEX:
II 2 G Ex ia IIC T6...T4 Gb
IECEx:
Ex ia IIC T6...T4 Gb
English version - 12/2020
Download
Ex Safety Instruction (XA)
Waterpilot FMX21 IECEx KEM 09.0026
Ex ia IIC T6...T4 Gb
English version - 06/2009
Download
Ex Safety Instruction (XA)
Safety Instruction Waterpilot FMX21 CSA Control Drawing
960008976 A
English version - 04/2017
Download
Ex Safety Instruction (XA)
XA Waterpilot FMX21 Ex ia IIC T6...T4 Gb
English version - 02/2024
Download
Ex Safety Instruction (XA)
Waterpilot FMX21 II 3 G Ex ec IIC Gc
English version - 03/2022
Download
Ex Safety Instruction (XA)
Safety Instructions Waterpilot FMX21 Ex ia IIC T4...T6 Gb
TÜV 14.1198 (INMETRO)
English version - 01/2015
Download
Ex Safety Instruction (XA)
Waterpilot FMX21 II 3 G Ex ec IIC Gc
English version - 10/2021
Download
Ex Safety Instruction (XA)
Waterpilot FMX21 1Ex ia IIC T6...T4 Gb
English version - 06/2022
Download
Ex Safety Instruction (XA)
Safety Instructions Waterpilot FMX21 4-20 mA HART
Ex ia IIC T6...T4 Gb
INMETRO IEE 11.0011 (INMETRO)
English version - 10/2012
Download
Ex Safety Instruction (XA)
Waterpilot FMX21 2Ex ec IIC T6...T5 Gc
English version - 06/2022
Download
Ex Safety Instruction (XA)
Waterpilot FMX21 II 2 G Ex ia IIC T6...T4 Gb
English version - 07/2021
Download
Certificates FM/CSA (ZD)
Waterpilot FMX21 Drawing No.: 960008976 -
Drawing Type: Control Drawing
English version - 06/2009
Download
Certificates FM/CSA (ZD)
Waterpilot FMX21 Drawing No.: 960008975 -
Drawing Type: Installation Drawing
English version - 06/2009
Download
Special Documentation (SD)
Instruction Waterpilot FMX21 cable shortening set Kabelkürzungssatz
cable shortening set
English version - 04/2009
Download
Special Documentation (SD)
Waterpilot FMX21 Hydrostatic level measurement Special Documentation Use in the drinking water sector (ACS)
English version - 12/2016
Download

Back
Change version
Change version

Selection of compatible products

/

Spare parts and accessories

further parts
further parts

Pressure compensation Waterpilot

further parts
further parts
Order code 52005578
further parts
further parts

Protection press.sensor Waterpilot, 5pc.

further parts
further parts
Order code 52008999
further parts
further parts

Protection cover, PFA

further parts
further parts
Order code 917755-0000

Mounting clamp FMX21, FMX11, 316L

Order code 52006151
Spare parts & accessories
Waterpilot FMX21 – product picture
Waterpilot-FMX21

Choose from our suggested options

Looking for more options?

Use the extended configuration to configure from all available options.

<%label%>
<%feature%>
-
-
<%feature%>

<%message%>

Looking for more options? Use extended configuration
Order code
Copy
-
-
Add to cart
More actions
Available once configuration is complete
Service not available
Only available on our desktop experience
Configuration details
Waterpilot FMX21 – product picture
Waterpilot-FMX21
Section ID Selected option

<%feature%>

<%coding%>

<%label%>

CAD Drawings
Configuration support

Unsure about configuration details?

Our experts can help, whatever stage your configuration is at.

Add your product to the cart and request a quote. Whether it is un-configured, partially configured, or fully configured, our experts will contact you to complete the configuration and provide your quote.

Have questions before you start?

Contact us

Spare parts and accessories

further parts
further parts

Pressure compensation Waterpilot

further parts
further parts
Order code 52005578
further parts
further parts

Protection press.sensor Waterpilot, 5pc.

further parts
further parts
Order code 52008999
further parts
further parts

Protection cover, PFA

further parts
further parts
Order code 917755-0000

Mounting clamp FMX21, FMX11, 316L

Order code 52006151
Spare parts & accessories

Selection of compatible products

/