Litronic FMS P78 planar sensor

Sensor/electronics evaluation

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Physical principle	Capacity determination in the high frequency stray field
Frequency	20 MHz
Measurement location	Measurement location: Outside silo via baffle plate, on belt with sliding shoe carriage, pipes, screw conveyors, tank, etc.
Measuring range	0-100% moisture content
Capacity resolution	3 fF
Update cycle	32.64 ms
Sampling rate mean value counter	16 – 25 106
Maximum attainable measuring accuracy	+/- 0.05 % moisture content 1.)
Measurement value transfer	digital: RS-485, multiprocessor log
Max. number of sensors on the bus	16
Maximum bus length	1200 m
Power supply	8 - 30V, 0.4 VA
Temperature measurement measuring range	-10 – 90 °C
Measuring accuracy temperature measurement	+/- 0.5 °C
Operating ambient temperature	5 – 72 °C
Working temperature - electronics	-20 – 80 °C
Storage temperature	-25 – 80 °C
Protection class	IP68
Connection cable type	UNITRONIC®ROBUST C 7x0.14 shielded
Connection cable length	6 m
Wearing protection:	Zirconium oxide (ZrO2Al2O3)
Housing/flange material	V4A (1.4404)
Dimensions: Ø/Height	78/57 mm alternatively: 30/94 mm
Weight without cable	0.500 kg
Weight clamping flange	0.300 kg

1) representative of the batch or the time window in the Contiprocess, in conjunction with the associated Litronic-FMS evaluation device, material-dependent, with ideal flow behaviour and with proper calibration.

Characteristics

• Pure capacitive measuring method

• Sensor exchange without recalibration

• Sensitivity adjustable in 3 steps

• Integrated microprocessor with mean value calculator

• Material flow detection

• Temperature compensation

• Limit value evaluation

• Direct digital measurement value determination

• Highly wear-resistant ceramic shield

• Stainless steel housing

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 protection class.
Very hard wearing protection: The sensor surface consists of a 2 mm thin zirconium oxide ceramic.
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.

Increased temperature ranges: For use at increased material temperatures, we offer our P78-T sensor, which is designed for max. 90 °C material temperature.
Explosion-protected areas: For the applicable equipment category II 2D Ex tb IIIC T85°C Db and II 3D Ex tc IIIC T85°C Dc we use our P78-E sensor.
Salt and acid: For highly aggressive substances, we use the high-grade material 1.4462 for the P78-H sensors.
High wear: The Liebherr P78-V sensor is ideally suited for abrasive materials thanks to its 10 mm thick washer.
Flange adaptations: For sensor installations in pipelines from DN150 and tank installations, we offer our DN80 flange. This is also available as a salt- and acid-resistant version.
sliding shoe slides: A proven method of installing the sensor on the material using the carriage. Stainless steel, Hardox 400, Vaudit, acid and salt resistant or ceramic lined versions are available.