Litronic-FMS P78-E planar sensor

Special precautions apply in areas where there is a risk of dust explosion.

Liebherr offers certified sensors for determining the moisture in bulk materials for the potentially explosive atmospheres Zone 21 and 22.

Bulk solids and materials such as coal, flour, wood, cocoa, coffee, sugar, starch and cellulose as well as magnesium and aluminium can be determined in-situ (real time) for the moisture value under particularly explosive conditions in conjunction with our proven FMS II evaluation and transfer unit. The sensors find their place in mixers, mills, dryers, conveyor belts, extraction points and the like.

Send the measured values directly and in-situ to your higher-level control system.

The self-sufficient measuring device for precise 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 bulk materials.

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

Liebherr offers sensors for the following equipment protection categories:



2014/34/EU EPS 20 ATEX 1 207 X / EPS 22 UKEX 1 160 X

EN IEC 60079-0:2018, EN 60079-31:2014

Dust EX protection:

II 2D Ex tb IIIC T85°C Db

II 3D Ex tc IIIC T85°C Dc


IECEx EPS 20.0077X

IEC 60079-0:2017 Edition 7.0, IEC 60079-31:2013 Edition 2

Dust EX protection:

Ex tb IIIC T85°C Db

Ex tc IIIC T85°C Dc

The 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.

  • 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.

Sales contact person

Liebherr-Mischtechnik GmbH

Im Elchgrund 12

88427 Bad Schussenried


Service contact person

Liebherr-Mischtechnik GmbH

Im Elchgrund 12

88427 Bad Schussenried