Components
rmh 12

Pipe sensors in production

Litronic FMS RMH12 pipe sensor

The Liebherr in situ water content determination Litronic-FMS III-RMH12 is used to detect the water content (concentration determination) even in very low ppm ranges in emulsions such as diesel fuel, transmission, hydraulic, engine, roller bearing, transformer and turbine oil as well as in battery systems.

The sensors were developed in cooperation with the ISO/TS 16332 standardisation committee for the water separation ability of diesel fuel filters.

The installation takes place on test and inspection stands and replaces the previous manual sampling as well as other offline measuring systems.

Measurement by the Liebherr sensor system is based on the physical principle of capacitance determination in the high-frequency stray field.

In addition to their high precision and robustness, the measuring devices from Bad Schussenried are characterised by their reproducibility.

Once the system has been calibrated, further measuring points can be set up or devices renewed on this basis at any time without great effort. The plant thus always remains reliable, regardless of its previous term and age.

Physical principleCoaxial field in a cylinder condenser
Frequency20 MHz
Measurement locationPipe diameter 12 mm
Process connectionErmeto cutting ring screw connection 12 mm, M18x1.5
Measuring range0 – 100 % water content, measuring window adjustable
Capacity resolution250 aF
Update cycle33.33 ms
Maximum attainable measuring accuracy+/- 10 ppm water content 1.)
Measurement value transferdigital: RS-485, streaming
Max. number of sensors on the bus4
Maximum bus length1200 m
Power supply12-24 V, 0.5 VA
Temperature measurement measuring range5 – 90 °C
Operating ambient temperature5 – 60 °C
Storage temperature-40 – 60 °C 2.)
Protection classIP65
Max. pressure6 bar
Volume flow5 - 1200 l/h
Connection line length/typeUNITRONIC® ROBUST C 7x0.14 shielded/6 m
Housing materialV4A (1.4305)
Dimensions: Ø/Length54/219 (230) mm
Weight without cableapprox. 2.1 kg

1.) with ideal flow behaviour and proper calibration

2.) free of liquid

Characteristics

• Direct digital measuring process.

• Extremely high capacity resolution due to patented measuring circuit

• 30 measurements per second enable assessment of the dynamic behaviour

• Automatic reference equalisation every second

• Temperature-stabilised, regulated quartz time base (TCXO)

• High-resolution temperature measurement/compensation of the liquid.

• High-resolution temperature measurement/compensation of the measuring circuit.

• Extremely high water resolution due to optimum geometry of the coaxial condenser.

• Ceramic coaxial condenser.

• High quality stainless steel housing.

• Resistant against aggressive liquids/oils.

• Flow-optimised throughput with even cross-section.

• Simple process connection.

• Digital interface/networking.

• Data-streaming technology with automatic bus arbitration.

Sales contact person

liebherr-pattern-contactperson

Liebherr-Mischtechnik GmbH

Im Elchgrund 12
88427 Bad Schussenried
Germany

Service contact person

liebherr-pattern-contactperson

Liebherr-Mischtechnik GmbH

Im Elchgrund 12
88427 Bad Schussenried
Germany