Moisture sensor, Litronic-FMS planar sensor type P71-HD with PEEK product contact surface

Small, fine, excellent...and new in hygenic design.

Our sensors in conjunction with the Liebherr moisture measurement system type Litronic-FMS has become indispensable for many industrial processes in several branches and now also designed for use in hygiene-critical production environments in the food industry.

Determine moisture/or water content during various food production, processing, refining and monitoring processes.

The moisture measuring installation was invented in 1985 at the Bad Schussenried factory. Measurement by the Liebherr sensor system is based on the physical principle of capacitance determination in the high-frequency stray field.


― Moisture sensor - capacity measurement in a high-frequency stray field

― Temperature sensor PEEK contact surface

― EHEDG-certified TYPE EL, CLASS I, MAY 2023 1.)

― FDA-conform

― Stainless steel housing V4A (1.4404) / 316L

― Suitable for SIP/CIP use

― VARINLINE® housing type N process connection

― Valid regulations: EC 1935/2004; (EU) No. 10/2011

― GMP (Good Manufacturing Practice) (EU) No. 2023/2006

― Sensitivity adjustable in three levels

― Limit value check

― Integrated microprocessor with mean value calculator

― Temperature compensation

― Sensor replacement without re-calibration

  • 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.
  • Waterproof and dustproof: The sensor is also suitable for the harshest environments thanks to its IP69K protection class.
  • High sensitivity: The sensor surface is made of the high-temperature resistant, thermoplastic material PEEK.
  • 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.
  • 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.
  • SIP & CIP: Cleaning in Place (CIP) und Sterilazation in Place (SIP)
  • GEA VARINLINE Type-N Process connection, so you pretty flexible
  • EHEDG: Hygenic food equipment certified according to the EHEDG guidelines

Planar sensor P71-HD

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Power supply 8…30V, 0.4 VA
Measuring range 0 – 100 % moisture content (measuring window adjustable)
Max. measuring accuracy +/- 0.05 % moisture content 2.)
Temperature measurement accuracy +/- 0.5 °C
Max. pressure in connection with Varinline® housing flange N 16 bar
Operating ambient temperature +5 – +80 °C
Operating temperature electronics -20 – +80 °C
CIP – max. cleaning temperature
(temperature/duration/ambient temperature)
90 °C / 30 min / 25 °C
SIP – max. sterilization temperature (steam)
(temperature/duration/ambient temperature)
121 °C / 15 min / 25 °C
Update cycle 32.64 ms
Protection class IP65, IP67, IP69K
Wear protection PEEK
Gasket EPDM E7502 3.)
Housing/flange material V4A (1.4404) / 316L
Dimensions: Ø / height 84 mm / 58 mm (without cable gland)
Weight without cable 1.2 kg
Connecting cable length 6 m
Connecting cable type UNITRONIC®ROBUST C 7x0.14 shielded
Measurement value transfer digital: RS-485, multi-processor protocol
Max. number of sensors on bus 16
Max. bus length 1200 m

1.) EHEDG logo may only be used in connection with the following designation “Moisture sensor, Litronic-FMS planar sensor type P71-HD with PEEK product contact surface and EPDM E7502”

2.) Representative according to the batch or the period of continuous operation with the corresponding evaluation unit Litronic-FMS II, depending on material, ideal material flow and proper calibration

3.) EHEDG approved material in connection with the logo

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Have we awakened your interest?

We will be happy to provide you with further information in a personal meeting or by e-mail.

Sales contact person

Liebherr-Mischtechnik GmbH

Im Elchgrund 12

88427 Bad Schussenried


Service contact person

Liebherr-Mischtechnik GmbH

Im Elchgrund 12

88427 Bad Schussenried