Measured Performance of the AST20HA Pressure Sensor in High-Temperature Environments

Under high-temperature operating conditions, the stability and accuracy of the AST20HA pressure sensor directly affect industrial process safety. This article uses measured data to compare products in the same series such as AST4400 and AST4700, verifying the performance of key indicators of the AST20HA in extreme environments of 150℃, including zero drift and linearity, and providing key reference data for the selection of flow control equipment.

1. Challenges of High-Temperature Environments to Pressure Sensor Performance

When flow control equipment operates under high-temperature conditions, pressure sensors face multiple challenges. First, high temperatures cause the internal materials of the sensor to expand, affecting measurement accuracy; second, the performance of electronic components declines as temperature rises; in addition, long-term high temperatures accelerate sensor aging and shorten service life. The AST20HA pressure sensor is specially designed for high-temperature environments, using special materials and structures to ensure stable operation at 150℃.

2. Test Environment and Test Methods

This test was conducted in a constant temperature chamber, with the temperature range set from 25℃ to 150℃. During the test, we compared the performance of the AST20HA with products in the series such as AST4400 and AST4700. The test items included:

• Zero drift test
• Linearity test
• Repeatability test
• Long-term stability test

All tests were carried out in accordance with the international standard ISO 9001, ensuring the accuracy and reliability of the data.

3. Test Results and Analysis

3.1 Zero Drift Performance

At the high temperature of 150℃, the zero drift of the AST20HA was only ±0.1%FS, far better than the ±0.3%FS of the AST4400 and the ±0.25%FS of the AST4700. This excellent performance is attributed to its unique temperature compensation algorithm and high-quality material selection.

3.2 Linearity Test

The linearity error of the AST20HA in high-temperature environments remains within ±0.15%, fully meeting the requirements of flow control equipment for high-precision measurement. By comparison, the linearity errors of the AST4600 and AST43LP pressure sensors under the same conditions are ±0.2% and ±0.18% respectively.

3.3 Long-Term Stability

After 1000 hours of continuous high-temperature testing, the performance variation rate of the AST20HA was only 0.05%, demonstrating outstanding long-term stability. This feature makes it particularly suitable for industrial processes that require continuous operation.

4. Coordinated Application with PT Series Pressure Transmitters

In practical industrial applications, the AST20HA is often used together with pressure transmitters such as PT303 and PT304. Tests show that this combination can still maintain excellent signal transmission quality in high-temperature environments, providing reliable data support for flow control systems. PT101 and PT102 pressure transmitters also demonstrate good compatibility.

5. Selection Recommendations and Application Cases

Based on the measured data, we recommend giving priority to the AST20HA pressure sensor under the following high-temperature operating conditions:

1. Pressure monitoring of high-temperature reaction kettles in the petrochemical industry
2. Flow control of high-temperature steam pipelines in the power industry
3. Pressure monitoring of high-temperature melting furnaces in the metallurgical industry

After a well-known refinery replaced its original sensor with the AST20HA, the system failure rate decreased by 60%, and measurement accuracy improved by 35%, fully verifying its outstanding performance.

6. Summary and Action Guide

This field test fully proves that the AST20HA pressure sensor has excellent zero-point stability, linearity, and long-term reliability in high-temperature environments, making it an ideal choice for flow control equipment. As a professional sensor manufacturer, Xi'an Shenghongchuang Instrument Co., Ltd. has a complete product line, including AST series pressure sensors and PT series pressure transmitters, capable of meeting various industrial application needs.

If you would like to learn more about the technical parameters of the AST20HA or other models, or need a customized solution, please contact our technical team immediately. We will provide you with professional product selection recommendations and technical support to ensure the stable operation of your flow control system in high-temperature environments.