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General Specifications


Unmatched Performance

Gearless, Direct Drive Design sets the industry standard for vibration, pulsation and shock resistance. Compact, low-volume setup reduces the impact of temperature fluctuations on gauge accuracy.

No Liquid Fill

Eliminate the risk of gauge fill fluid leaking or discoloring. Sanitary environment friendly. Reduce pointer flutter with Perma-Cal’s® unique internal pointer dampening.

Eliminate Leak Paths

Sleek, all-welded design customized to perform specifically with Perma-Cal® gauges and eliminate potential leak paths.

Price Advantage

Superior performance at a superior price

Perma-Cal® Gauge/ Mini-Seal vs. Traditional C-Tube Gauge/ Seal.



Ideal for use on processes which are corrosive, viscous, unrefined or unfiltered.

Prevents media from clogging the Bourdon tube.

  • Chemical plants

  • Wastewater treatment facilities

  • Sanitary environments (food and beverage)

  • Crude oil pipelines

  • Ethanol production facilities

  • Refineries, and more...


  • ±.5% of F.S.

  • ±.5% F.S. at M.S. / ±1% F.S.

Accuracy Ref. @ 68°F, ±2°F


  • Vacuum - 1,000 psi (or equivalent)

  • Units: psi, bar, kPa, kg/cm² (others available)

  • Types: Single or Dual Scale, Vacuum and Compound


  • Material:

    • ABS (acrylonitrile butadiene styrene)

    • Aluminum

    • Glass-Filled Nylon: High-Temp Yellow Turret Style

    • Stainless Steel

  • Sizes, Types and Colors:

    • 2.5", 3.5", 4.5"

    • No Flange, Rear Flange, Turret

    • Black, Blue, Green, Red, White, Yellow or other specified

  • Metal Case Finish: Powder Coated or Unpainted


  • Window Construction:

    • Acrylic

    • Tempered Glass (increases heat tolerance)

  • Overpressure Tolerance: 150% F.S. without shift in calibration


  • Material (wetted parts):

    • Stainless Steel

    • Hastelloy

  • Connection Type:

    • 1/4 or 1/2 FNPT

    • 1/4 or 1/2 MNPT

    • Bottom mount only

  • Burst Pressure: 10,000 psi

  • Max Working Pressure: 2,000 psi

Other options available. Contact the factory.


  • Media Temperature: -40°F to 650°F

  • Ambient Temperature:

    • ABS: -40°F to 190°F

    • GFN and Metal: -40°F to 400°F

Case, Diaphragm Seal, and Fill Fluid selection determines operating temperature range.


  • Standard Fill

    • Silicone DC200 (or equivalent)

    • Operating Temp: -40°F to 400°F

  • Inert Fill

    • Halocarbon 6.3 (similar to Fluorolube but suitable for vacuum service)

    • Operating Temp: -40°F to 400°F

  • High-Temp Fill

    • Silicone DC704 (or equivalent)

    • Operating Temp: 0°F to 650°F

Max 200°F in vacuum service for all fills. Click here for more information on vacuum service.

Other options available. Contact the factory.


  • Lifetime warranty that the Bourdon tube will not malfunction due to wear.

  • 1 year from delivery or 18 months from date of manufacture against defects in materials and workmanship.