Main features & Overview


The HWF series of Gefran are pressure transmitters with HART communication protocol for using in high temperature environment with explosive atmosphere presence.

The main characteristic of this series is the capability to read temperature of the media up to 315°C.

The constructive principle is based on the hydraulic transmission of the pressure.

The fluid-filled system assures the temperature stability. The physical measure is transformed in an electrical measure by means of strain-gauge technology.

The transmitters have been designed and manufactured according to FM standards with the following types of protection and features:

- Explosion-proof (XP) for Class I, Division 1, Groups A, B, C and D

- Dust-Ignition proof (DIP) for Classes II, III, Division 1, Groups E, F and G

- Indoor and outdoor areas classified as hazardous: Type 4X, IP67

- Rated ambient temperature of T5 Ta = -20°C to +85°C, T6 Ta = -20°C to +60°C


  • Pressure ranges from: 0-35 to 0-1000 bar / 0-500 to 0-15000 psi
  • Accuracy: < ±0.25% FS (H); < ±0.5% FS (M)
  • FM approval for potentially explosive atmospheres
  • 1/2-20UNF, M18x1.5 standard threads, mounting flange ø 66.3mm (2.61”)
  • Autozero function on board / external option
  • 17-7 PH corrugated diaphragm with GTP+ coating


Gefran product range brochure
Melt pressure sensors
Flyer Melt for Polymers
HWF Datasheet
HFM-HWF User Manual
H pressure transmitter description file
H pressure transmitter description files for HH475
RoHS informative note


EU conformity declaration_HWF FS min 500bar PL d
EU Conformity declaration_HWF FS over 500bar SIL 2
EU conformity declaration_HWF FS min 500bar SIL 2
EU Conformity declaration_HWF FS over 500bar PL d
SIL2 certification - TUV - HMF_HWF