Litronic FMS IV

A self-sufficient moisture measuring installation with high connectivity and many interesting possibilities. With ProfiNet technology on board, extensive signal processing and WEB-based access, we are ready for Industry 4.0.

Without Ethernet support, these tasks cannot be accomplished.

At the beginning of each measured section, the calibration per product must be carried out by means of reference procedures. The Litronic-FMS IV software enables convenient and rapid parametrisation.

The evaluation unit receives the raw values measured by the Liebherr sensors and immediately converts them into the measured value, such as percentage humidity.

Up to 16 sensors can be managed via the WEB with one device. A curve manager and material and sample management helps the user to create the product-specific calibration.

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.

In addition to their high precision and robustness, the measuring devices from Bad Schussenried are characterised by their reproducibility. A sensor exchange or a transfer to another measured section is also possible without recalibration.



Reliable humidity measurement – Litronic-FMS (PDF, 4.2 MB)

Technische Data

Measuring cycle of the evaluation up to 100 measurements per second
Measured value output Profinet analogue 0 (4) -20 mA @ 500 Ohm 0 -10 V DC ( 12 bit DAC ), (RS 232)
Measuring range Measuring window can be parametrised as desired
Operating modes Batch process,
continuous process
Supply voltage 24 V DC (-15 %/+20 %)


– Parametrisation and calibration via WEB interface

– Fully automatic operation

– Manual or automatic operation (switchover with Litronic FMS IV WEB interface)

– Channel summary, material switching (e.g. coarse/fine switching)

– Adjustable measuring range

– Ethernet connection (Profinet)

– Modular design for easy expansion

– Assembly on standard TS35 mounting rail for simple switch cabinet mounting


  • 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.
  • Multiple measuring points: Up to 16 sensors can be connected to one evaluation unit.
  • Modular: If required, the FMS IV can be expanded with further modules such as digital inputs and outputs, analogue outputs such as 0-10 V/4-20 mA, etc.
  • Well stowed: The evaluation unit is mounted on a TS-35 top-hat rail and can thus be installed in the switch cabinet.
  • Process control and regulation: Thanks to extensive interfaces, the moisture measurement can be integrated into process control systems and controls.
  • Limit values: Maximum or minimum limits can be set using the software (web-based). Light or sound signals can be triggered if required.
  • Mean value calculator: The FMS IV receives the signals from the sensors and can output already averaged values to a higher-level control if required.
  • Software: The Liebherr FMS IV software is available for visualisation, configuration, measured value recording and calibration. No PC software installation is necessary any more, as it is web-based.


Example of the structure of an FMS IV Profinet. Up to 16 streaming sensors can be connected to one FMS IV unit. A web-based software offers you many advantages from configuration to administration to visualisation.

Plug and Play Gateway (PPG) for connecting up to two streaming sensors. Benefits such as simple connection of the sensors, automatic bus termination, automatic addressing, acceptance of the synchronisation of various connection configurations will win you over right down the line. We offer pre-assembled cables as well as cables and connectors for individual adaptation.

The Liebherr FMS IV software is available for visualisation, configuration, measured value recording and calibration. No PC software installation is necessary any more, as it is web-based.