Collection: Oil Filled Pressure Gauge

An oil-filled pressure gauge, also known as a liquid-filled pressure gauge, is a type of pressure measuring instrument where the internal space of the gauge casing is filled with a liquid, typically silicone oil or glycerin. This liquid serves several purposes, such as damping vibrations, providing lubrication, and transmitting pressure from the sensing element to the dial mechanism. Oil-filled manometers are commonly used in industrial settings and applications where there are vibrations, pulsations, or rapid pressure changes that could affect the accuracy and lifespan of the manometer.

Here's a detailed overview of oil-filled pressure gauges and their features:

1. Purpose of Oil Filling:

The main purpose of filling the casing of a pressure gauge with oil is to dampen and absorb vibrations and pulsations caused by pressure fluctuations in the system being measured. This helps prevent rapid movement of the gauge's internal components, which can lead to inaccurate readings and premature wear and tear. The oil also serves as a lubricant for the internal moving parts, promoting smoother operation and extending the gauge's lifespan.

2. Components:

An oil-filled pressure gauge includes components similar to other manometers, with the addition of the oil-filled casing:

- Casing: The casing of the gauge is filled with oil or another suitable liquid. This oil surrounds the internal components and provides damping and lubrication.

- Dial, Pointer, and Scale: These components indicate the pressure reading as in any pressure gauge.

- Movement Mechanism: The mechanism converts the movement of the sensing element (e.g., Bourdon tube) into the rotational movement of the pointer.

- Connector: The connector allows the pressure from the fluid being measured to enter the gauge.

- Transparent Cover: Protects the dial and pointer from environmental factors and damage.

3. Working Principle:

The working principle of an oil-filled pressure gauge is similar to other pressure gauges, where pressure from the fluid being measured is transmitted to a sensing element (e.g., Bourdon tube). However, in an oil-filled gauge, the pressure is also transmitted to the oil within the casing. The oil acts as a medium for pressure transmission and helps dampen rapid movements caused by pressure fluctuations. The movement of the sensing element and the oil-filled casing is then converted into the movement of the pointer on the dial, indicating the pressure reading.

4. Advantages:

- Vibration Damping: The oil-filled casing absorbs vibrations and pulsations, leading to more accurate readings in environments with high vibration levels.

- Longevity: The oil lubricates internal components, reducing wear and tear and increasing the gauge's lifespan.

- Stability: The damping effect of the oil provides stability to the gauge's movement, resulting in steadier readings.

- Readability: The liquid filling can enhance the readability of the gauge by minimizing pointer oscillations due to pressure fluctuations.

5. Applications:

Oil-filled pressure gauges are used in various industrial applications where vibrations, pulsations, or rapid pressure changes are common. Some common applications include:

- Hydraulic Systems: Monitoring pressure in hydraulic systems prone to pressure fluctuations and vibrations.

- Industrial Machinery: Measuring pressure in machines that produce vibrations, such as pumps and compressors.

- Pipelines: Monitoring pressure in pipelines where the flow of fluids can create pulsations.

- Pneumatic Systems: Gauges used in systems involving compressed air, which can experience rapid pressure changes.

In summary, an oil-filled pressure gauge is designed to mitigate the effects of vibrations and pulsations in industrial environments by filling the gauge casing with oil. This enhances accuracy, stability, and longevity, making it suitable for applications with challenging operating conditions.

Understanding the Benefits of an Oil Filled Pressure Gauge

In industries where accurate pressure measurement is vital for operational efficiency and safety, the choice of pressure gauge plays a crucial role. Among the various types of pressure gauges available in the market, the oil filled pressure gauge has emerged as a preferred choice for many applications due to its numerous benefits. In this article, we'll delve into the advantages of using an oil filled pressure gauge, including its variants like glycerin pressure gauges, pressure gauges filled with glycerin, liquid filled pressure gauges, and glycerin type pressure gauges.

What is an Oil Filled Pressure Gauge?

An oil filled pressure gauge is a specialized type of pressure gauge that is filled with a damping fluid, typically oil, glycerin, or silicone, to enhance its performance and accuracy. The damping fluid helps to stabilize the needle, reducing the effects of vibration and pulsation, and providing more consistent and accurate pressure readings over time.

Key Benefits of an Oil Filled Pressure Gauge

1. Enhanced Durability and Longevity

- Protection Against Vibrations: The damping fluid absorbs vibrations, reducing wear and tear on internal components.

- Extended Lifespan: The protection provided by the oil filling extends the gauge's lifespan, resulting in reduced maintenance costs.

2. Improved Accuracy and Stability

- Stabilized Readings: The damping effect of the oil ensures stabilized readings by minimizing needle fluctuations caused by pulsation or vibration.

- Consistent Performance: The enhanced stability leads to consistent and accurate pressure readings over time.

3. Resistance to Environmental Factors

- Protection Against Corrosion: The oil filling provides an additional layer of protection against corrosion and environmental factors.

- Temperature Stability: Oil filled pressure gauges often exhibit better temperature stability compared to dry gauges, making them suitable for a wider range of applications.

Variants of Oil Filled Pressure Gauges

Glycerin Pressure Gauge

A glycerin pressure gauge is a specific type of oil filled pressure gauge that uses glycerin as the damping fluid. Glycerin offers excellent viscosity and temperature stability, making it a popular choice for applications requiring high accuracy and reliability.

Pressure Gauge Filled with Glycerin

This refers to a pressure gauge that is specifically filled with glycerin as the damping fluid. These gauges offer the benefits of glycerin, including excellent viscosity and temperature stability, and are ideal for applications where high accuracy is required.

Liquid Filled Pressure Gauge

A liquid filled pressure gauge is a more general term that refers to any pressure gauge filled with a liquid damping fluid, which can be oil, glycerin, or silicone. While oil and glycerin are the most common damping fluids used, silicone is also used in certain applications where compatibility with specific materials is required.

Glycerin Type Pressure Gauge

A glycerin type pressure gauge refers to a pressure gauge that is designed to be compatible with glycerin filling. While it may not be filled with glycerin by default, it is designed to accommodate glycerin filling if required. This type of pressure gauge offers flexibility and can be filled with glycerin or other damping fluids based on the application's requirements.


Oil filled pressure gauges offer numerous advantages over traditional dry gauges, making them a preferred choice for many industrial and commercial applications. Whether you opt for a glycerin pressure gauge, a pressure gauge filled with glycerin, a liquid filled pressure gauge, or a glycerin type pressure gauge, these gauges provide reliable and consistent performance in demanding conditions.

At WESEN Technologies, we offer a wide range of oil filled pressure gauges and their variants to meet your specific requirements. Our gauges are designed and manufactured to the highest standards to ensure accuracy, reliability, and durability in all types of applications.

Contact us today to learn more about our oil filled pressure gauge solutions and how we can help you select the right gauge for your needs. We look forward to assisting you with all your pressure measurement needs!