GP Series Ultra High Purity (UHP) Pressure Gauges, assembled with FITOK FR face seal fittings, are applicable for gases, liquids and corrosive media in high purity conditions and also in corrosive environments. They are the ideal choice for ultra high purity gas distribution systems of industries including semiconductor, electronic, medical, etc.


  • Dial Sizes: 2 in. (50 mm), 2 1/2 in. (63 mm)
  • Up to 6000 psi measurement range
  • Inner surface electropolished to a roughness Ra ≤ 10 μin. (0.25 μm)
  • Leak rate (helium): ≤ 1×10-9 std cm3/s
  • Lower or centre-back mount optional
  • For ultra high purity application

Connection Types and Mount Methods

DesignatorConnection Type
RFRRotatable Male FR Metal Gasket Face Seal Fitting
FFRRotatable Female FR Metal Gasket Face Seal Fitting
FRIntegral Male FR Metal Gasket Face Seal Fitting

Example: Part Number GP-B50-RFR4-100PB

Ultra High Purity Pressure Gauge, GP Series, centre-back mount, 50 mm dial size, 1/4″ rotatable male FR metal gasket face seal fitting, dual scale dial range, primary range 0 to 100 psi, secondary range 0 to 7 bar.

In addition to GP Series Ultra High Purity Pressure Gauges, FITOK offers GA Series All Stainless Steel Pressure Gauges, GB Series Safety Stainless Steel Pressure Gauges and GC Series Clean Gas Pressure Gauges. The pressure gauges provide accurate pressure measurement for industrial, high purity and ultra high purity applications. Gauges are available in a variety of pressure ranges, dial sizes, connections and mounting options.

Should you require any extra information please contact our sales team: or call 01942601209.