• Introduction

Bourdon tube pressure gauges are among the most widely used mechanical devices for measuring pressure in gases, steam, and liquids. Known for their reliability and simplicity, they are designed with a curved, elastic metal tube that responds to changes in internal pressure. These instruments offer a wide measuring range, from vacuum pressures (-1 bar) to very high pressures (up to 1000 bar), and are available in various case sizes and materials to suit different industrial environments and media types.

  • Working Principles

They operate on the principle of elastic deformation of a Bourdon tube. When pressure is applied, the Bourdon tube either expands or contracts, and this movement is translated into a pressure indication on the gauge’s scale.

To enhance performance in demanding conditions, some models (especially those with 100 mm and 160 mm cases) can include the Manodamp® axle damping system, which helps absorb shocks and vibration.

  • Applications

Bourdon tube gauges are versatile and widely used across numerous industries, including:

  • Industrial process control (oil & gas, chemical plants)

  • HVAC systems

  • Power generation and steam systems

  • Water treatment facilities

  • Hydraulic and pneumatic systems

  • Marine and offshore applications

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Bourdon Tube PG SR 01 Utility black steel

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Bourdon Tube Utility Pressure Gauge - black steel, NS 63, NS 100 Pressure Gauges with steel powdered casing and Copper Alloy Socket and Movement, Sheet glass, dual display bar/psi
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Bourdon Tube PG SRU 25 stainless steel

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Bourdon Tube Pressure Gauge - fully stainless steel, NS 63, NS 100 Seamless Tube Bourdon, Socket SS316L - NACE MR 0175 Silicon Jelly Stabilizer Movement SS304 White Aluminium Dial Case SS304, NBR Gasket. IP 66 protected TIG welding - TÜV - Helium Leak tested Rugged construction with temp. compensated Neopren Rubber Blow Out Disc Safety Glass Fillable, dual display bar/psi
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Bourdon Tube PG SRU 25X SS with Diaphragm Seal

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Bourdon Tube Pressure Gauge - fully SS, NS 100 with Diaphragm Seal Seamless Tube Bourdon, Socket SS316L - NACE MR 0175 Silicon Jelly Stabilizer Movement SS304 White Aluminium Dial Case SS304, NBR Gasket. IP 66 protected TIG welding - TÜV - Helium Leak tested Rugged construction with temp. compensated Neopren Rubber Blow Out Disc Safety Glass Fillable, dual display bar/psi Connected to Diaphragm Heavy Duty Miniseal AISI SS316 for corrosive, viscous, sedimentous media and/or with a high temperature, up to 400 bar and -40 to 200°C
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Bourdon Tube PG SRU 35 Stainless Steel/Brass

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Bourdon Tube Pressure Gauge - semi stainless steel, NS 63, NS 100 Pressure Gauges with stainless steel case and Copper Alloy Socket and Movement, rugged construction with Neopren Rubber Blowback, Plexi glass, fillable, dual display bar/psi
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Bourdon Tube PG-R brass/stainless steel

In stock

SKU: Pressure Gauge R
Semi Stainless Steel Pressure Gauges (Bourdon bronze & Socket brass, SS or brass Movement, Case SS304, Bayonet lock bezel SS304), glass window), blow out disk, fillable Option:  Manodamp® Movement with damped axles, Contact Device, Diaphragm Seal
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Bourdon Tube PG-RU stainless steel

In stock

SKU: Pressure Gauge RU
The Schmierer Bourdon Tube Pressure Gauge RU type is a rugged, highly accurate mechanical instrument built for industrial applications. Featuring a stainless steel Bourdon tube and bayonet lock case, it delivers precise overpressure measurement for gases and liquids in demanding environments.
  • Key Features & Specifications:
    • Design: EN 837-1 compliant with a bayonet lock case and safety glass window.
    • Material: Wetted parts (Bourdon tube and connection) and case made from durable stainless steel.
    • Accuracy: Class 1.0 precision.
    • Connection: BSP threading (special threads available upon request).
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Pressure Gauge Transmitter w. Local Display PTX-36

In stock

SKU: PTX-36
The PTX-36 Pressure Transmitter with local display with both analog (solid front gauge case) and 4-20 mA output for PLC/PID and data loggers shows clear reading in the case of power failure.