Mercury Filled Melt Pressure Transducers

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Gefran M-Series: Mercury Filled Melt Pressure Sensors

Mercury Filled Melt Pressure Transducers

Gefran M-Series

The mercury-filled melt pressure sensors, designed by Gefran on an extensometric technology, are suitable to work at high temperature, up to 400°C, assuring a total compliance with the maximum levels of accuracy and of reliability.

The M7 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 constructive principle of Gefran's M-series is based on the hydraulic transmission of the pressure.
The fluid-filled system assures the temperature stability.

The physical measure is transformed in a electrical measure by means the strain-gauge technology.
A near incompressible liquid (mercury) is used for pressure transmission.

Melt Pressure Measurement on Plastic Film Winders
Gefran M-Series Melt Pressure Transducers: Features
Melt Pressure Measurement for the plastics and packaging industry


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 M-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 MX and Gefran MFx (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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