Liebherr sensors in use in explosion-protected areas

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 60079-11:2006 Edition: 5, 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 sensors are installed directly in pipes or in tanks.

The sensors are used, for example, in oils, crude oils, paints, lacquers, ethanol, solvents as well as in bulk materials under explosive conditions.

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 atmospheres Dust – Zone 22
Physical principle Capacity determination in the high frequency stray field
Frequency 16 – 22 MHz
Measurement location Outside silo via baffle plate, on belt with sliding shoe carriage, pipes, screw conveyors, tank, etc.
Measuring range 0 – 100% moisture content (measuring window adjustable)
Capacity resolution 10 fF
Update cycle 33 ms
Sampling rate mean value counter 16 – 22 106
Maximum attainable measuring accuracy:
With optimum material-specific calibration, with
averaging with ideal flow behaviour with
Litronic FMS II Evaluation and transfer module/PC Software
+/- 0.05 % moisture content
Measurement value transfer digital: RS-485, multiprocessor log
Max. number of sensors on the bus 16
Maximum bus length 1200 m
Power supply 8 - 30V, 0.4 VA
Temperature measurement measuring range -10 – 90 °C
Measuring accuracy temperature measurement +/- 0.5 °C
Operating ambient temperature 5 – 72 °C
Working temperature - electronics -20 – 80 °C
Storage temperature -25 – 80 °C
Protection class IP68
Connection cable type UNITRONIC®ROBUST C 7x0.14 shielded
Connection cable length 6 m
Wearing protection Zirconium oxide (ZrO2Al2O3)
Housing/flange material V4A 1.4404 (Option: 1.4571)
Dimensions: Ø/Height 78/53/57 mm
Weight without cable 0.900 kg
Clamping flange weight 0.300 kg
Ex-protection 2014/34/EU ZELM 06 ATEX 3320X
Ex-marking Ex II 3D Ex tD A22 IP6x T85°C Dc

Note special operating conditions!

• The power supply of the sensor may only be connected to the power pack PH15-2406 (Id.no.10030513) or to the power pack WAGO 787-1002 (Id.no.1116 9330)

• The connection cable may only be moved if the ambient temperature is above 5°C and below 70°C

• If the cable is to be connected within the hazardous area, it must have a protection class of at least IP-6x after installation or comply with another recognised type of ignition protection for this area

• The permissible ambient temperature range is -20°C to +80°C

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, 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 -20 °C to 80 °C
Storage temperature -25 °C to 80 °C
Pressure  
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 66 mm to 2000 mm (optional up to 5000 mm)
Measuring field material PEEK
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, powder & bulks, 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, 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 -20 °C to 80 °C
Storage temperature -25 °C to 80 °C
Pressure  
Pressure -1 bar to 100 bar
Material  
Housing material 1.4571 (optional 2.4819)
Measuring field material/wearing protection PEEK
Dimensions  
Housing W/H 45 mm
112.6 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 Pipeline, bulk material
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 -20 °C to 80 °C
Storage temperature -25 °C to 80 °C
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  
Housing W/H 86 mm
120 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). The sliding fitting allows the sensor to be changed quickly without having to empty and depressurise the tank.
  • 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