What factors should be considered when choosing a liquid filled pressure gauge?

In high vibration, high temperature or harsh environments, liquid-filled pressure gauges are a pressure measuring instrument with high stability and accuracy. They are widely used in the industrial field. Choosing a suitable liquid filled pressure gauge can ensure the accuracy of the measurement results and extend the service life of the equipment. This article will discuss the main factors to consider when selecting a liquid-filled pressure gauge.

1.Temperature and pressure range of the working environment
When selecting a liquid filled pressure gauge, you first need to understand the temperature and pressure range of the working environment. Different liquid-filled pressure gauges are suitable for different working pressures and temperature ranges. Make sure that the upper and lower limits of the working pressure of the selected pressure gauge meet the actual application requirements. In addition, the temperature of the working environment also has a great impact on the performance of the pressure gauge. In high or low temperature environments, pressure gauges with special materials and liquid-filled media need to be selected to avoid errors or damage caused by excessive temperature differences.

2.Selection of liquid filled media
The liquid-filled pressure gauge is filled with liquid media. Common liquid-filled media include glycerin, silicone oil, etc. The selection of liquid-filled media should be determined based on factors such as the temperature of the working environment, the degree of vibration, and whether it is in contact with corrosive media. Glycerine filled pressure gauge is suitable for low and normal temperature environments and can effectively buffer external vibrations, while silicone oil is more stable in high temperature environments. In addition, the chemical stability and corrosion resistance of the filling medium to the measurement system should also be ensured when selecting.

3.Vibration and shock
In high-vibration or high-impact working environments, ordinary pressure gauges may cause pointer jumps or inaccurate measurements due to vibration. Liquid-filled pressure gauges effectively reduce the impact of external vibration and shock on measurement through the damping effect of the filling medium. Therefore, if the application environment has large vibration or shock, it is a wise choice to choose a liquid-filled pressure gauge. However, it should be noted that the liquid filling amount of the liquid filled pressure gauge should be optimized according to the vibration frequency and amplitude to ensure the best stability.

4.Connection method and installation size
The connection method and installation size of the liquid filled pressure gauge should also be selected according to the actual application. Common connection methods include threaded connection, flange connection, etc. When selecting, it is necessary to ensure that it matches the interface of the pipeline or equipment. The installation dimensions include dial diameter, external dimensions, and installation hole spacing, which must be consistent with the on-site installation conditions to avoid problems such as inability to install or loose installation due to inappropriate dimensions.

5.Material and protection level
The material of the pressure gauge determines its durability and corrosion resistance. According to the properties of the medium in the working environment (such as corrosive substances such as acid, alkali, and salt water), materials with good corrosion resistance, such as stainless steel or alloy materials, should be selected. In addition, if there are pollutants such as dust and water vapor in the working environment, choosing a pressure gauge with a high protection level (such as IP65, IP67, etc.) can effectively prevent the intrusion of foreign substances and ensure the long-term stable operation of the instrument.

6.Accuracy and measurement accuracy
The accuracy of the liquid filled pressure gauge is an important indicator to measure its performance. When selecting, the appropriate accuracy level should be selected according to the actual measurement needs. For applications requiring higher accuracy, a pressure gauge with higher accuracy (such as 0.5%F.S or 0.25%F.S) can be selected; for general industrial use, a pressure gauge with lower accuracy (such as 1.0%F.S) can meet the needs.

7.Maintenance and calibration
Even high-stability liquid filled pressure gauges require regular maintenance and calibration. When selecting, you should consider the ease of maintenance of the pressure gauge, whether it is convenient to calibrate and replace the filling medium. Some high-end liquid-filled pressure gauges may also have self-diagnosis functions, which can monitor their working status in real time, thereby reducing manual intervention.

In summary, when selecting a liquid-filled pressure gauge, you should consider the working environment temperature, pressure range, filling medium, vibration and shock, connection method, installation size, material, protection level, measurement accuracy, and subsequent maintenance and calibration. Based on a comprehensive evaluation of these factors, you can choose the most suitable liquid filled pressure gauge to ensure the accuracy of the measurement process and the long-term stability of the equipment.