K7 PLc

Main features & Overview


The K7 Performance Level 'c' Series are pressure sensors  for use in high temperature applications where the process temperatures may reach 538°C (1000°F) such as high temperature engineered polymers.

The K Series utilizes standard melt pressure principles and construction; strain sensing technology is bonded foil strain gage.

A near incompressible sodium-potassium (i.e. NaK) mixture is used for pressure transmission.

NaK is FDA recognized safe (GRAS) substance.


  • Perfromance Level 'c'
  • Pressure ranges from: 0-35 ato 0-1000 bar / 0-500 to 0-150000 psi
  • Accuracy: < ±0.25% FS (H); < ±0.5% FS (M)
  • Hydraulic transmission system for pressure signal guarantees stability at working temperature (NaK). Liquid conforming to RoHS Directive. NaK is defined as a safe substance (GRAS).
  • Quantity of NaK contained per model: K70 series (30mm³) [0.00183 in³], K71, K72 (40mm³) [0.00244 in³]
  • 1/2-20UNF, M18x1.5 standard threads; other types available on request
  • Autozero function on board / external option
  • Inconel 718 diaphragm with GTP+ coating for temperatures up to 538°C (1000°F)
  • 15-5 PH diaphragm with GTP+ coating for temperatures up to 400°C (750°F)
  • HastelloyC276 diaphragm for temperatures up to 300°C (570°F)
  • 17-7 PH corrugated diaphragm with GTP+ coating for ranges below 100 bar-1500 psi
  • Material of stem 17-4PH


Gefran product range brochure
Melt pressure sensors
4.0 Gefran product catalog
4.0 plastic application catalogue
K7 PL'c' Datasheet
KE-K7 PL'c' User manual


EU Conformity declaration_not amplified Melt K min 500bar
Performance Level 'c' Certification ME/M7, WE/W7, KE/K7 Series
GTP+ FDA Certificate
EU Conformity declaration_K series FS min 500bar PL c
EU Conformity declaration_K series FS over 500bar PL c
UK Conformity declaration - Melt K min 500bar PLc
UK Conformity declaration - Melt K over 500bar PLc

2D/3D Files

File 3d

K71 8 PL 'c'.easm
K71 8 PL 'c'.IGS
KE1 8 poli PLc.STEP

All files