Why is there liquid in a pressure gauge?

Table of Contents

1. Introduction
2. Function of Liquid in Pressure Gauges
3. Typical Liquids Used and Their Characteristics
4. Numerical Analysis and Parameters
5. Guanshan Instruments Company Solutions
6. References

Introduction

Liquid-filled pressure gauges are a critical component in various industries, ensuring precise measurement and durability under challenging conditions. This article discusses why liquid is used in pressure gauges, its advantages, and solutions provided by Guanshan Instruments Company.

Function of Liquid in Pressure Gauges

The inclusion of liquid within a pressure gauge serves multiple purposes:

• Vibration Damping: Liquids like glycerin or silicone absorb and dampen vibrations, stabilizing the needle for an accurate reading.
• Lubrication: The liquid provides lubrication to the movement inside the gauge, which extends the service life.
• Freezing Prevention: In cold environments, certain liquids prevent the internal components from freezing.

Typical Liquids Used and Their Characteristics

The most common liquids used are glycerin and silicone oil due to their viscosity and thermal properties:

• Glycerin: Often used for its ability to dampen vibration and operate effectively in temperatures ranging from -20°C to 60°C.
• Silicone Oil: Suitable for more extreme conditions, maintaining its properties from -40°C to 100°C.

Numerical Analysis and Parameters

Liquid-filled pressure gauges are evaluated based on several parameters:

• Operating Pressure Range: Typically between 0 and 1000 psi, depending on the gauge design.
• Accuracy Class: Common accuracy classes are 1.0, 1.6, or 2.5 according to ASME B40.100 standards.
• Viscosity: Glycerin has a viscosity of 1.5–2.0 Pa·s at 20°C, which ensures optimal damping. Silicone oils have a wider viscosity range, making them versatile for varying applications.

Guanshan Instruments Company Solutions

Guanshan Instruments Company offers innovative solutions integrating the latest technology in liquid-filled pressure gauges:

• Customizable Fill Liquids: Depending on the application, gauges can be filled with glycerin, silicone oil, or specialized fluids.
• Enhanced Durability: Proprietary sealing technology enhances leak prevention.
• Wide Temperature Range: Solutions tailored to operate in extreme environments from -50°C to 120°C.

References

• ASME B40.100-2013, Pressure Gauges and Gauge Attachments
• Guanshan Instruments Company Datasheets and Technical Specifications
• Moore, D. (2015). Pressure Measurement and Calibration, Industrial Press, Inc.