Litronic FMS P80-CAN planar sensor

The CAN bus is used in on- and off-road applications, vehicles in the construction and agricultural sectors as well as in engines. The CAN bus is integrated in the sensor.

The sensor meets critical EMC and environmental requirements. The signals are integrated and processed directly in the customer’s control. The CAN bus signals communicate directly with the control apparatus.

Measurement by the Liebherr sensor system is based on the physical principle of capacitance determination in the high-frequency stray field.

In addition to their high precision and robustness, the sensor system from Bad Schussenried is characterised by its reproducibility.

Each CAN sensor is individually calibrated and final tested.


Technical data

Sensor basic data
Diameter with collar 80.0 mm
Diameter without collar 78.0 mm
Housing height 43.1 mm
Height with socket 56 mm
Weight 0.625 kg
Housing material Stainless steel 1.4305
Cover material Stainless steel 1.4301
Wear plate material Ceramic AI203
Process connection Clamping flange
Protection class IPX9K/IP68
Sensor exchange without recalibration Yes
Technology Streaming
Sensor for moisture content
Measured variable Electrical permittivity high resolution, depending on material moisture content and material density
Frequency 21-25 MHz
Operating temperature 5-70 °C
Material penetration depth (depending on material) 3-5 (measuring part influence decreasing exponentially with depth) cm
Sensors for temperature
Measured variable Open the 1st Oscillator temperature
Open the 2nd Plate temperature
Output temperature resolution 0.01 K
Measuring range -10 to 80 °C
Measurement value transfer
Bus type CAN 2.0 B ISO 16845 certified
Baud rate 250,000 bit/s
Transceiver 3.3 V cross-circuit protection, overvoltage protection up to +/- 36 V, loss of ground protection, overheating protection (thermal shutdown) and common-mode transient protection of +/- 100 V
Bus scheduling External, internal possible
Electrical connection
Supply voltage 12 (min/max 6-36) V
Power consumption 0.3 Amax/17 mA@12V
Reverse polarity protection Yes
Connection DEUTSCH DT 15-4P
0V/GND Pin 1
CAN-Low Pin 2
CAN-High Pin 3
+12V Pin 4
CAN messages
Format identifier 29-Bit-Identifier, Extended frame format
Number of bytes in the data field (DLC) 8
Measured value identifier 0x01505043
NTC1 Electronics temperature: Integer with 2 decimal places
Indication: °C + 40 °C
NTC2 Temperature behind ceramic plate: Integer with 2 decimal places
Indication: °C + 40 °C
C_value Humidity sensor capacity value: Integer with 2 decimal places


  • 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 IP68/IPX9K protection class.
  • 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.
  • Median filter and mean value calculator: The sensor passes on already averaged values to the higher-level control.


P80-CAN planar sensor data sheet (PDF, 246 KB)

Litronic FMS-P80-CAN leaflet (PDF, 568 KB)

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