Oil-Filled Melt Pressure Transducers

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FDA Oil Filled Melt Pressure Transducers

Oil-Filled Melt Pressure Transducers

Gefran W-Series: FDA-Oil filled Melt Pressure Transducers

The oil-filled melt pressure sensors, designed by Gefran on an extensometric technology, are suitable to work at high temperature, up to 315°C, assuring a total compliance with the maximum levels of accuracy and of reliability.

Every single sensor of the W series, besides using a FDA approved filling fluid, if fully compliant with RoHS Directive.

The W serie Performance Level 'c' version is conform to the European standard EN1114-1 related to the safety requirements for extruders.


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The W Series utilizes standard melt pressure principles and construction; strain sensing technology is bonded foil strain gauge.

A near incompressible mixture (diathermic oil) is used for pressure transmission.

FDA Oil Filled Melt Pressure Sensors: Features
Gefran Pressure Measurement using Extensimetric Technology
Melt Pressure Measurement for the plastics and packaging industry

Mercury-free solutions

Sensitive to environmental issues, and in full harmony with the RoHS Directive (2002/95/CE), GEFRAN offers a wide
range of mercury-free Melt sensors, with filling oil.


The new GTP coating, the result of Gefran research, guarantees longer Melt sensor life thanks to:

  • Greater hardness
  • Resistance to high temperatures
  • Low coefficient of friction

Autozero Function

All Gefran amplified W-series Melt Pressure Sensors have the Autozero functions, which eliminates signal variations linked to a thermal effect before putting the system under pressure.


With the SP option (internal autocompensation), W-series transmitters cancel the effect of variation of pressure signal
caused by variation of Melt temperature. In this way, the read error caused by heating of the filling fluid is reduced to a minimum.

ATEX and Factory Mutual

Gefran WX and Gefran WF (Factory Mutual) transmitters and transducers are certified based on their respective protection and safety requisites, and can work in potentially explosive atmospheres.

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