Liebherr sensors in use in explosive areas

Water content determination Litronic WMS II

The Liebherr Litronic WMS II water content meter is used to measure the moisture or water content of a wide range of water content of a wide variety of media and materials in refineries, on oil platforms, in pipelines, in tanks, in many applications in the chemical and petrochemical industry, sludge dewatering, drying, waste incineration and sewage treatment plants. Also in the agricultural sector up to the pharmaceutical industry and many other industries.

The wide range of applications extends from the most diverse emulsions to the finest powders and dusts and coarse-grained materials (max. grain size 32 mm) such as

- Oil, crude oil, diesel, biodiesel, hardening oil (upstream / downstream)

- Coolants

- Paints, lacquers, solvents

- Wax, resin

- Other emulsions, suspensions

- Water-product separation

- Dust, slag

- Fertiliser

- Washing powder, agent

- Sawdust

- Biomass

- Flour

- etc.

Applications:

- Water cut meter

- Pipeline, tanks BS&W (Basic sediment and water) measurement

- Petroleum purification/desalination

- Automatic well testing

- LACT units

- Separation control

The self-sufficient measuring device for precise water content/moisture determination in the running process guarantees the highest quality and safety in EX-protected production environments, the further processing and refinement of very many emulsions and bulk materials.

The PC software enables fast and accurate calibration of the measured sections.

Liebherr offers sensors for the following device protection categories:

Certificates

ATEX:

EU-type examination certificate number: EPS 21 ATEX 1 140 X

DIN EN IEC 60079-0:2018, 60079-1:2014, EN 60079-11:2012, EN 60079-26:2015, EN 60079-31:2014

Gas EX-protection:

II 1/2 G Ex db/ia IIC T4 Ga/Gb

Dust EX-protection:

II 1/2 D Ex tb/ia IIIC T135°C Da/Db

IECEx:

Certificate number: IECEx EPS 21.0047X

IEC 60079-0:2017 Edition: 7.0, IEC 60079-1:2014-06 Edition: 7.0,

IEC 60079-11:2011 Edition: 6.0, IEC 60079-26:2014-10 Edition: 3.0,

IEC 60079-31:2013 Edition: 2

Gas EX-protection:

Ex db/ia IIC T4 Ga/Gb

Dust EX-protection:

Ex tb/ia IIIC T135°C Da/Db

The WMS II sensors are permitted for the following markets:

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.

Table is scrollable
Suitable for use in potentially explosive areas Dust/Gas - Zone 0/20
Measurement  
Physical principle Capacity determination in the high frequency stray field
Measurement location Pipeline, Tank
Adjustable measuring range 0 - 100 % moisture content (measuring window adjustable)
Number of scattered fields 1
Update cycle 65 ms
Achievable measurement accuracy ± 0.05 % with correct material curve
Temperature measurement accuracy ± 0.5 °C
Outflow  
Measured value transmission - Sensor display content Current loop with “4 - 20 mA” for external display (option)
Measured value transmission - sensor PLC or main computer Analogue: “4 - 20 mA” active at 500 Ohm digital: Hart Modem
Valid measurement 3.75 mA to 21.6 mA (NAMUR)
Interface signal resolution 16 bit
Max. length of connecting cable 1000 m (depending on cable)
Power supply  
Connection 24 V, 150 mA DC
Temperature  
Medium temperature -5 °C* to 80 °C (Standard)
Ambient temperature sensor head 5 °C to 80 °C
Ambient temperature transmitter head 5 °C to 70 °C
Storage temperature -25 °C to 80 °C
* Under certain conditions  
Pressure  
Pressure -1 bar up to 100 bar
Pressure measurement (optional) relative up to 40 bar
Material  
Housing / rod material 1.4571 (optional 2.4819)
Transmitter head material Aluminium
Measuring field material/wearing protection PEEK
Dimensions  
Housing W/H/D 88 mm
160 mm
143 mm
Rod diameter 45 mm
Rod length 6" to 32" (further lengths on request)
Measuring field material PEEK
Measuring field position Front or side
Table is scrollable
Suitable for use in potentially explosive areas Dust/Gas - Zone 0/20
Measurement  
Physical principle Capacity determination in the high frequency stray field
Measurement location Confined space, piping, etc.
Adjustable measuring range 0 - 100 % moisture content (measuring window adjustable)
Number of scattered fields 1
Update cycle 65 ms
Achievable measurement accuracy ± 0.05 % with correct material curve
Temperature measurement accuracy ± 0.5 °C
Outflow  
Measured value transmission - Sensor display content Current loop with 4 - 20 mA for external display (option)
Measured value transmission - sensor PLC or main computer Analogue: 4 - 20 mA active at 500 Ohm digital: Hart Modem
Valid measurement 3.75 mA to 21.6 mA (NAMUR)
Interface signal resolution 16 bit
Max. length of connecting cable 1000 m (depending on cable)
Power supply  
Connection 24 V, 150 mA
Temperature  
Medium temperature -5 °C* to 80 °C (Standard)
Ambient temperature sensor head 5 °C to 80 °C
Ambient temperature transmitter head 5 °C to 70 °C
Storage temperature -25 °C to 80 °C
* Under certain conditions  
Pressure  
Pressure -1 bar to 100 bar
Material  
Housing material 1.4571 (optional 2.4819)
Measuring field material/wearing protection PEEK
Dimensions  
Sensor W/H 45 mm
112.6 mm
Housing transmitter head 88 mm / 160 mm / 143 mm
Cable length between sensor and transmitter head 10 m
Table is scrollable
Suitable for use in potentially explosive areas Dust/Gas - Zone 0/20
Measurement  
Physical principle Capacity determination in the high frequency stray field
Measurement location Chutes, belts, silo outlets, tanks, etc.
Adjustable measuring range 0 - 100 % moisture content (measuring window adjustable)
Number of scattered fields 1
Achievable measurement accuracy ± 0.05 % with correct material curve
Temperature measurement accuracy ± 0.5 °C
Outflow  
Measured value transmission - Sensor display content Current loop with 4 - 20 mA for external display (option)
Measured value transmission - sensor PLC or main computer Analogue: 4 - 20 mA active at 500 Ohm digital: Hart Modem, Modbus RTU
Valid measurement 3.75 mA to 21.6 mA (NAMUR)
Interface signal resolution 16 bit
Max. length of connecting cable 1000 m (depending on cable)
Power supply  
Connection 24 V, 150 mA DC
Temperature  
Medium temperature -5 °C* to 80 °C (Standard)
Ambient temperature sensor head 5 °C to 80 °C
Ambient temperature transmitter head 5 °C to 70 °C
Storage temperature -25 °C to 80 °C
* Under certain conditions  
Pressure  
Pressure Flange for bolting on: -1 bar to 1 bar
Flange for welding on: -1 bar to 80 bar
Material  
Housing material 1.4571 (optional 2.4819)
Measuring field material/wearing protection Ceramic, ZrO2
Dimensions  
Sensor 78 mm
Housing transmitter head W/H/D 88 mm
160 mm
143 mm
Cable length between sensor and transmitter head 10 m
  • Indirect measuring method: Capacity determination in the high frequency stray field. This method uses the different dielectric constant (permittivity) of water and different materials (solids and liquids)
  • Fully reproducible sensors: If the plant is subsequently extended with sensors or if sensors are replaced, no recalibration is necessary thanks to the built-in microprocessor.
  • Process control and regulation: Thanks to extensive interfaces, the moisture measurement can be integrated into process control systems and controls.
  • Cost saving: Time-consuming and costly laboratory analyses are no longer necessary or can be reduced.
  • Temperature measurement/temperature compensation: The sensor can also be used to determine the temperature of the medium.
  • Limit values: Maximum or minimum limits can be set using the software. Light or sound signals can be triggered if required.
  • Mean value calculator: The sensor passes on already averaged values to the FMS evaluation and transfer module.
  • Compressive strength: The rod sensor withstands process pressures of up to 100 bar.
  • Sliding fitting: For cleaning, flushing or sensor replacement, the sliding fitting can be easily pulled out of the pipeline even under these circumstances without disturbing the process.
  • Pressure sensor: The pressure sensor measures the pressure of the pipeline or tank system. (only on P45-GD rod sensor)
  • Flange: Use the flange to connect the sensor to the pipeline, tank system or bulk solid receptacle
  • Sliding fitting: With the sliding fitting you can mount the sensor on tank systems (rod sensor) and pipelines. The sliding fitting allows the sensor to be changed quickly without having to empty and depressurise the tank or the pipe.
  • External display and control unit: The display and control unit is mounted up to 50 m away from the sensor in an easily accessible position. It is connected directly to the electronics of the sensor and powered by it.
  • Software: for start-up and configuration.

Sales contact person


Liebherr-Mischtechnik GmbH

Im Elchgrund 12

88427 Bad Schussenried

Germany


Service contact person


Liebherr-Mischtechnik GmbH

Im Elchgrund 12

88427 Bad Schussenried

Germany