Bourdon Tube Pressure Gauge

January 30, 2025

At Mid-West Instrument, we take pride in delivering precision-engineered solutions to meet your industrial pressure measurement needs. A Bourdon tube pressure gauge, like our Model 109, is a reliable and versatile tool designed to measure differential pressure accurately. This guide provides a detailed understanding of Bourdon tube pressure gauges, including how they work, their unique features, applications, and the benefits they provide.

How Does a Bourdon Tube Pressure Gauge Work?

The Bourdon tube pressure gauge operates on the principle of elasticity. A Bourdon tube is a slightly flattened, arc-shaped metal tube. When pressure is applied to the inside of the tube, it tends to revert to its original circular cross-section, causing the tube to straighten. Since one end of the tube is fixed, the other end moves in response to the pressure.

In our Model 109, system pressure is applied to the inside of the Bourdon tube and a pressure chamber. The resulting difference between the internal and external pressures causes the tube to flex. This movement is transmitted via a magnetically coupled shaft to the jeweled pointer on the dial, providing a precise differential pressure reading.

Key Features of the Mid-West Instrument Model 109

Our Model 109 Bourdon tube pressure gauge offers several advanced features to meet demanding industrial requirements:

  1. High Accuracy: The Model 109 offers full-scale accuracy of ±1/2% or ±1%, ensuring reliable readings for critical applications.
  2. Durable Construction: With a rugged Bourdon tube sensing element and glass-reinforced thermoplastic dial case, the gauge is built to withstand harsh environments.
  3. Over-Range Protection: A bi-directional relief valve protects the assembly from overpressure, ensuring longevity and safety.
  4. Versatile Dial Options: The 270° dial arc allows for clear readings, available in a variety of scales, including PSI, bar, and square root for flow indication.
  5. Corrosion Resistance: Constructed with materials such as 316/316L stainless steel and optional O-ring materials like Viton, the gauge is resistant to corrosion.
  6. Weather Resistance: Designed with NEMA-rated protection, the Model 109 is suitable for outdoor and indoor use.

Applications of Bourdon Tube Pressure Gauges

The Model 109 Bourdon tube pressure gauge is used across a wide range of industries and applications, including:

  • Flow Measurement: Square root graduations enable direct reading of flow rates, ideal for fluid control systems.
  • Pump Performance Testing: Accurately monitors pressure variations to evaluate pump efficiency.
  • Hydraulic Filter Monitoring: Identifies pressure drops across filters to determine clogging and maintenance needs.
  • Heat Exchanger Monitoring: Tracks pressure differences to ensure optimal performance in heating and cooling systems.

Benefits of Using the Model 109

Choosing the Model 109 Bourdon tube pressure gauge from Mid-West Instrument offers numerous benefits:

  • Precision Readings: High accuracy ensures reliable data for critical decision-making.
  • Robust Durability: Designed to withstand challenging industrial conditions, reducing maintenance and replacement costs.
  • Versatility: Suitable for various fluids and applications, with customizable dial scales and configurations.
  • Safety: Over-range protection and corrosion-resistant materials enhance operational safety.
  • Ease of Use: The 270° dial arc and clear graduations enable quick and easy readings.

Conclusion

The Bourdon tube pressure gauge is an essential tool for monitoring differential pressure in industrial systems. At Mid-West Instrument, our Model 109 stands out for its precision, durability, and versatility. Whether you’re monitoring hydraulic filters, testing pump performance, or managing heat exchangers, this gauge is designed to deliver exceptional performance.

For more than 60 years, we have been a trusted provider of high-quality differential pressure instruments. Contact us today to learn more about the Model 109 and how it can meet your specific application needs.