Technical Data
CompareContinuous / Liquids
| Measuring Principle | Hydrostatic |
| 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 |
| 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 |
| Marine approval | GL/ ABS/ BV/ DNV/ LR |
| Drinking water approvals | KTW/ NSF/ ACS |
| Options | Absolute measuring cell Integrated temperature sensor Pt100, 4-wire customer specific adjustment customer specific cable marking |
| Application limits | Measuring cell: ceramics |
Pressure
| Measuring Principle | Hydrostatic pressure |
| 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 |
| Reference Accuracy | 0.2% 0.1% (optional) |
| Long term stability | 0.1% of URL/year |
| 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 |
| Marine approvals | GL/ ABS/ BV/ DNV/ LR |
| Drinking water approvals | NSF/ KTW/ ACS |
The Waterpilot FMX21 transmitter uses an oil-free capacitive ceramic measuring cell for hydrostatic level measurement in the process industry and the environmental sector. With HART output, a freely adjustable measuring range and automatic density compensation, it increases level measurement accuracy. It is approved for drinking water measurement and offers built-in temperature measurement. Application versions for wastewater and sludge measurement are also available.
Advantages
High-purity ceramic sensor (99.9% Al2O3) with strong overload resistance
4...20 mA with superimposed HART 6.0 output
Automatic density compensation for improved measurement accuracy
Built-in Pt100 temperature sensor (optional) for simultaneous level and temperature measurement
A wide range of accessories provides complete measuring point solutions
Fully sealed electronics and dual-filter pressure compensation system protect the sensor from climatic influences
Small 22 mm (0.87“) outside diameter version suitable for drinking water applications and small-diameter measurement locations such as pumping and deep wells
Areas of application
Three different versions for drinking water, wastewater and sewage, and salt water respectively.
Process connection: suspension clamp, cable gland
Temperature: -10...+ 70°C (14...158°F)
Measuring range: 0...20 bar / 200m H2O (0...300 psi / 600ft H2O)
Accuracy: ±0.2%, platinum version: ±0.1%
International explosion protection approval, marine approval, drinking water approval
Spare Parts & Accessories 14
14 spare parts · click to expand
| Order code | Description | |
|---|---|---|
| 52005578 | 压力补偿组件consists of: 10x Teflon filter 5x filter socket | Enquire |
| 52008999 | 遮阳罩caps to protect the membrane | Enquire |
| 917755-0000 | Protection cover, PFAUsage: DB4x/DB5x, FMX165, FMX167/FMX21 42mm. | Enquire |
| 52006151 | 安装夹具for cable fixing (7,5-10,5mm) | Enquire |
| 52006153 | 重锤|FMX21/FMX167,316Lheightening of sensor-weight at 300g, several weights per probe are possible Waterpilot FMX167, diameter 22mm/0,87in + 29mm/1,15in | Enquire |
| 52008264 | 电缆固定螺丝for tight fixing of the FMX167 cable | Enquire |
| 52008938 | 接线盒block of 4 binding posts for hat rail | Enquire |
| 52009311 | 电缆固定螺丝for tight fixing of the FMX167 cable. | Enquire |
| 52011868 | 功能测试接头for pressure admission and simplify the function test of Waterpilot FMX167, diameter 22mm/0,87in + 29mm/1,15in | Enquire |
| 71222671 | 延伸电缆缩短夹 FMX21Shortening kit for cable. Usage: FMX21, FMX167. | Enquire |
| 52006152 | 接线盒with filter + binding posts on hat rail | Enquire |
| 71325087 | ***HART 通讯电阻Usage: FMG50, FMR20, FMX21 with RIA15. | Enquire |
| 71593573 | Transmitter 2-wire TMT71 -20/+80oCPrepared for -20...+80oC. Usage: FMX21 temperature output. | Enquire |
| 71593576 | Transmitter 2-wire TMT72 HART -20/+80oCPrepared for -20...+80oC. Usage: FMX21 temperature output. | Enquire |
Configurator / Comparison
Source:Endress+Hauserwebsite public information
Measuring principle video
Click to playManuals & Documents 6
All documents for this modelCase Studies
Municipal Wastewater Treatment · Static Pressure Measurement — Application Case
Project Background
The project covers the inlet, biological and outlet stages of a municipal plant. The work centres on Static Pressure Measurement and the core task is inferring vessel level or density from hydrostatic pressure.
Operating Challenges
The medium and duty are characterised by high solids and corrosive fractions, with large diurnal flow swings, and effluent parameters drift and probes foul with sludge and biofilm. So Static Pressure Measurement cannot be specified generically — it calls for choosing range by tank height, density and pressurisation.
Solution
The Ainstru engineering team worked through the pressure range: pressure solution matched to process pressure and temperature. The configuration involves choosing range by tank height, density and pressurisation, with these requirements in view: stable compliance with Grade 1A discharge limits and online data reporting.
Results
Since start-up the system has run steadily; the practical result is submersible mounting that avoids civil works in pit and sump retrofits.
Food & Beverage · Static Pressure Measurement — Application Case
Project Overview
The site is dosing, pasteurising, filling and CIP stages. The customer wanted Static Pressure Measurement properly configured on the existing plant, with the aim of inferring vessel level or density from hydrostatic pressure.
Technical Challenges
What actually causes trouble is syrups, dairy and beverages that scale easily, under strict hygienic requirements, and frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles. All of this means the Static Pressure Measurement configuration has to involve choosing range by tank height, density and pressurisation.
Configuration
Supply and installation were organised through the pressure range: pressure solution matched to process pressure and temperature. On site this meant choosing range by tank height, density and pressurisation, checked line by line against: food-safety and hygienic design per 3-A / EHEDG.
Performance
After commissioning the outcome is submersible mounting that avoids civil works in pit and sump retrofits, and the readings are now used for process tuning.
Chemical & Pharmaceutical · Static Pressure Measurement — Application Case
Site Conditions
This is a Chemical & Pharmaceutical customer whose plant is at reactors, metering vessels and finished-product tanks. The main task was inferring vessel level or density from hydrostatic pressure.
The Problem
The difficulty lies in highly corrosive media with solvents and crystallisation, partly in explosive atmospheres; at the same time corrosion plus Ex protection shortens instrument life and makes downtime costly. Specification therefore means choosing range by tank height, density and pressurisation.
What We Did
We took a pressure range approach — pressure solution matched to process pressure and temperature. Delivery was built around choosing range by tank height, density and pressurisation, with point-by-point checks on: Ex certification and GMP traceability of records.
Operating Outcome
In service the system performs as intended — submersible mounting that avoids civil works in pit and sump retrofits, with routine maintenance falling noticeably.
Power & Energy · Static Pressure Measurement — Application Case
Application Context
boiler feedwater, turbine condensate and FGD/DeNOx systems is a typical Power & Energy duty. The project started from Static Pressure Measurement, focusing on inferring vessel level or density from hydrostatic pressure.
Process Constraints
drift under high temperature and pressure, with very costly unplanned outages, and high temperature and pressure with both steam and saline water only amplify it. The Static Pressure Measurement specification must therefore cover choosing range by tank height, density and pressurisation.
Delivery Approach
Delivery was handled as the pressure range — pressure solution matched to process pressure and temperature. Execution centred on choosing range by tank height, density and pressurisation, together with compliance with power-industry codes and unit availability targets.
Field Results
Operation shows the benefit clearly — submersible mounting that avoids civil works in pit and sump retrofits, with confidence in this measuring point improving markedly.
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