Fluid-Free Melt Pressure Transducers

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Piezoresistive Technology: Entirely fluid-free melt pressure transducers

Fluid-Free Melt Pressure Transducers

Gefran I-Series

The IMPACT series represents the innovative family of the Gefran high temperature melt pressure transducers designed on a patented fluid free technology.

A silicon piezoresistive primary element together with a high intrinsic robustness let the IMPACT sensors to work at pressures up to 3000 bar and to reach temperatures of 350 °C.

The whole IMPACT series is conform to the RoHS Directive and in the PL "c" version is compliant with the European norm EN1114-1 related to the safety requirements for the extruders.


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"IMPACT" is Gefran's exclusive series of high-temperature pressure sensors that use the piezoresistive principle. The main characteristic of "IMPACT" sensors is that they do not contain any transmission fluid. The sensitive element, directly positioned behind the contact membrane, is realised in silicon through microprocessing techniques.

The micro structure includes the measurement membrane and piezoresistors. The minimum deflection required by the sensitive element makes it possible to use very robust mechanics. The process contact membrane can be up to 15 times thicker than the membrane used in traditional Melt sensors.

Gefran Melt Pressure Sensor: Microchip
Fluid Free Melt Pressure Sensor: Construction
Fluid Free Melt Pressure Sensor: Membrane

Physical stress is transduced by a Wheatstone bridge with 4 piezoresistors. Gefran's IMPACT series, with proprietary technology, provides:

  • High strength (up to 35 times stronger that traditional sensors)
  • High response speed
  • Extremely easy installation thanks to a modular sensor
  • High safety standards (conformity to Machinery Directives and RoHS)


Gefran's nFluid Free Melt Pressure Transducers: Features

  1. 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
  2. All Gefran I-series amplified Melt pressure sensors have the Autozero functions, which eliminates signal
    variations linked to a thermal effect before putting the system under pressure.
  3. Autocompensation: Gefran's IMPACT technology, digital electronics automatically compensate for drift due to thermal effect.
  4. Gefran IX Transucers are Atex-certified based on their respective protection and safety requisites, and can work in potentially explosive atmospheres.
  5. Sensitive to environmental issues, and in full harmony with the RoHS Directive (2002/95/CE), GEFRAN offers a wide
    range of mercury-free and Fluid-Free Melt sensors

Performance Level "C" (PL"c" EN13849-1)

IMPACT Melt Pressure Transducers are available in the IMPACT PL"c" version, conforming to the safety requisites of the recent Machinery Directive 2006/42/CE and EN1114 specific for extruders.

IMPACT PL"c" features intelligent electronics with Auto Diagnostics to detect possible faults.

An integrated relay in the electronics changes state in case of overpressure or if the setpoint is exceeded.

Increased safety on the IMPACT PL"c" is completed by full conformity to Namur NE21 and NE43 recommendations.


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