Main features & Overview


The “IMPACT” series of Gefran, are pressure transmitters, without transmission fluid, for using in High temperature environment (350°C).

Medium pressure is transferred directly to the sensitive silicon element via a thick diaphragm.

Strain is transduced by a micro-worked silicon structure (MEMS).

The operating principle is piezoresistive. “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.


  • Pressure ranges: 0-100 to 0-1000 bar / 0-1500 to 0-15000 psi
  • Accuracy: < ±0.25% FS (H); < ±0.5% FS (M)
  • Standard threading 1/2-20UNF, M18x1.5; other versions on request
  • Other types of diaphragms are available on request
  • Autozero function on board / external option
  • 15-5 PH stainless steel diaphragm GTP+ coated


Gefran product range brochure
Melt pressure sensors
4.0 plastic application catalogue
I3 datasheet
Instruction Manual
Manual of electrical installation for pressure probes
Kunstoffemagazine 12/2010: Schmelzedruckmessung mit neuem Impuls
Kunststoffmagazin 10/08: Kosten senken in der PC-Extrusion
Kunststoffmagazin 9/06: Massedruckmessung für alle Fälle


EU Conformity declaration_IMPACT
EU Conformity declaration_IMPACT PLc
GTP+ FDA Certificate
Conformity declaration EU - not amplified Melt I
UK Conformity declaration - not amplified Melt I