Sensors in use on mobile harvesting machines to determine the moisture in the ongoing harvesting process.

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.

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
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.

Sales contact person

Liebherr-Mischtechnik GmbH

Im Elchgrund 12
88427 Bad Schussenried
Germany

+49 7583 9498-07

Service contact person

Liebherr-Mischtechnik GmbH

Im Elchgrund 12
88427 Bad Schussenried
Germany

+49 7583 9498-00