The "IMPACT" series sensors are pressure transmitters, without transmission fluid, designed for use in high temperature environments (350°C).
The media pressure is transferred through a thick membrane directly to the silicon sensing element.

The main characteristic of the "IMPACT" sensors is that they do not contain any transmission fluid inside.

The sensing element, directly positioned behind the contact membrane, is made by silicon through micromachining techniques and the minimum deflection necessary to the sensing element, allows the use of very strong mechanics, with a process membrane 15 times thicker than the membranes used in traditional Melt sensors.

The new "HIE" series combines Impact technology with Smart/Hart digital technology with in addition SIL2 and PLd certifications for functional safety applications.

All these features make the “HIE” series particularly suitable for applications in process plants especially for the production of polymers, fibres and resins.


  • Fluid-free" solution without filling fluids
  • Measuring ranges: 0-10 to 0-1000 bar / 0-150 to 0-15000 psi
  • Accuracy: < ±0.25% FS (H); < ±0.5% FS (M)
  • Output signal: 4-20 mA/Hart
  • Rangeability: 3:1
  • Process temperature: up to 350°C
  • Stem thermal drift: <±0.0036%FS
  • Standard threads 1/2-20UNF, M18x1.5;
  • Autozero function on board / external option
  • High-thickness 15-5 PH stainless steel membrane with GTP+ coating
  • SIL2 Certification
  • PLd Certification


Brochure (Massedruckaufnehmer und -messumformer)
Gefran product range brochure
4.0 Gefran product catalog
4.0 plastic application catalogue
Flyer Melt for Polymers
HIE Datasheet
HIX - HIE User Manual
H pressure transmitter description file
H pressure transmitter description files for HH475


EU Conformity declaration_HIE PL d
EU Conformity declaration_HIE SIL 2
EU Conformity declaration_HIE
UK Conformity declaration - Melt HIE PLd
UK Conformity declaration - Melt HIE
UK Conformity declaration - Melt HIE SIL2