
Specs at a glance
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Accuracy
0.2%
0.1% (optional) -
Process temperature
-10°C...70°C
(14°F...158°F)
Diameter 29 mm (1.14"): 0°C...50°C
(32°F...122°F) -
Pressure measuring range
100 mbar...20 bar
(1.5 psi...300 psi) -
Main wetted parts
Diameter 22 mm and 42 mm: Seal, 316L, Ceramic
Diameter 29 mm: Seal, PPS, Polyolefin, Ceramic
Extension cable: PE, PUR, FEP -
Max. measurement distance
200 m H2O
(656 ft H2O) -
Measuring cell
100mbar...20bar
(1.5psi...300psi)
Field of application
The Waterpilot FMX21 transmitter with capacitive, oil-free ceramic measuring cell is typically used in the process and environmental applications for hydrostatic level measurement. With HART output, the measuring ranges can be freely adjusted and a density-compensated level measurement can be activated. It is certified for drinking water and offers integrated temperature measurement. Versions for applications in wastewaters and sludges or usage in salt water are also available.
Three different versions for drinking water, wastewater and sewage, saltwater.
Process connections: Suspension clamp, cable gland
Temperature: –10 to +70°C (14 to 158°F)
Measuring range: 0 to 20bar / 200m H20 (0 to 300psi / 600ft H2O)
Accuracy: ±0.2%, "Platinum" ±0.1%
International explosion protection certificates, marine approvals, drinking water approval
Benefits
Robust overload-resistant high purity ceramic sensor (99.9% Al2O3)
Flexible scaling of 4 to 20mA with superimposed HART 6.0 output
Highest level accuracy using temperature compensated density correction
Simultaneous measurement of level and temperature with optionally integrated Pt100 temperature sensor
Extensive range of accessories provides complete measuring point solutions
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Climate proofed sensor thanks to completely potted electronics and 2-filter pressure compensation system
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Small outer diameter of 22mm (0.87") version suitable for drinking water applications and for use in bore holes and wells with small diameters
Videos
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Pressure measuring principle
Fundamental selection
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Simple products
- Easy to select, install and operate
Technical excellence
Simplicity

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Standard products
- Reliable, robust and low-maintenance
Technical excellence
Simplicity
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Specialized products
- Designed for demanding applications
Technical excellence
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Variable
FLEX selections | Technical excellence | Simplicity |
---|---|---|
Fundamental selection Meet your basic measurement needs |
Technical excellence
|
Simplicity
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Lean selection Handle your core processes easily |
Technical excellence
|
Simplicity
|
Extended selection Optimize your processes with innovative technologies |
Technical excellence
|
Simplicity
|
Xpert selection Master your most challenging applications |
Technical excellence
|
Simplicity
Variable |
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Measuring principle
Hydrostatic pressure
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Characteristic
Compact probe with ceramic cell for hydrostatic level measurement,
Diameter = 22 mm: General applications, fresh water
Diameter = 42 mm: Waste water applications
Diameter = 29 mm: Salt water applications -
Supply voltage
10.5 ...35V DC
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Reference Accuracy
0.2%
0.1% (optional) -
Long term stability
0.1% of URL/year
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Process temperature
-10°C...70°C
(14°F...158°F)
Diameter 29 mm (1.14"): 0°C...50°C
(32°F...122°F) -
Ambient temperature
-10°C...70°C
(14°F...158°F)
Diameter 29 mm (1.14"):
0°C...50°C
(32°F...122°F) -
Measuring cell
100mbar...20bar
(1.5psi...300psi) -
Process connection
Suspension clamp
Cable mounting screws -
Communication
4...20 mA
4...20 mA HART -
Certificates / Approvals
ATEX, FM, CSA, CSA C/US, IEC Ex, INMETRO, NEPSI, UK Ex
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Marine approvals
GL/ ABS/ BV/ DNV/ LR
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Drinking water approvals
NSF/ KTW/ ACS
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Measuring principle
Hydrostatic
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Characteristic / Application
Compact probe with ceramic cell for hydrostatic level measurement,
Diameter = 22 mm: General applications, Fresh water
Diameter = 42 mm: Waste water applications
Diameter = 29 mm: Salt water applications -
Specialities
Automatic density compensation
Version w/o metal parts in contact to process -
Supply / Communication
10.5 ...35 VDC
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Accuracy
0.2%
0.1% (optional) -
Long term stability
0.1% of URL/year
-
Ambient temperature
-10°C...70°C
(14°F...158°F)
Diameter 29 mm (1.14"):
0°C...50°C
(32°F...122°F) -
Process temperature
-10°C...70°C
(14°F...158°F)
Diameter 29 mm (1.14"): 0°C...50°C
(32°F...122°F) -
Pressure measuring range
100 mbar...20 bar
(1.5 psi...300 psi) -
Main wetted parts
Diameter 22 mm and 42 mm: Seal, 316L, Ceramic
Diameter 29 mm: Seal, PPS, Polyolefin, Ceramic
Extension cable: PE, PUR, FEP -
Process connection
Suspension clamp
Cable mounting screws -
Max. measurement distance
200 m H2O
(656 ft H2O) -
Communication
4...20 mA
4...20 mA HART -
Certificates / Approvals
ATEX, FM, CSA, CSA C/US, IEC Ex, NEPSI
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Marine approval
GL/ ABS/ BV/ DNV/ LR
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Drinking water approvals
KTW/ NSF/ ACS
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Options
Absolute measuring cell
Integrated temperature sensor Pt100, 4-wire
customer specific adjustment
customer specific cable marking -
Application limits
Measuring cell: ceramics
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