Selection and Installation of High-Temperature Pressure Transmitters

High-temperature pressure transmitters are commonly used measuring devices in industrial production for accurate pressure measurement under high-temperature conditions. In practical applications, proper selection and installation are critical to ensuring their performance and service life.

Key Considerations for Selecting High-Temperature Pressure Transmitters

1. Measurement Range

When selecting a high-temperature pressure transmitter, the first step is to determine the measurement range. The range should be based on the actual application to ensure the selected transmitter can fully cover the expected pressure variations during operation. If the range is too small, the transmitter may be damaged; if the range is too large, measurement accuracy may be reduced.

2. Accuracy Class

The higher the accuracy class, the more precise the measurement results. However, higher-accuracy transmitters are typically more expensive, so the accuracy level should be selected according to actual requirements. Common accuracy classes in industrial applications include 0.1%, 0.2%, and 0.5%. For applications with stringent accuracy requirements—such as aerospace or precision instrument manufacturing—high-accuracy transmitters should be selected. For applications with less demanding accuracy needs, such as general industrial pipeline pressure measurement, transmitters with lower accuracy are usually sufficient.

3. Temperature Range

Since these devices are designed for high-temperature applications, the operating temperature range is a critical factor. The transmitter must be able to operate reliably under actual high-temperature conditions, with minimal impact of temperature variations on measurement accuracy. Different high-temperature pressure transmitters offer different temperature compensation ranges, so selection should be based on the specific operating temperature.

4. Output Signal

High-temperature pressure transmitters are available with various output signal types, commonly including 4–20 mA, 0–5 V, and 0–10 V. The appropriate output signal should be selected based on the requirements of downstream equipment. For example, if the receiving system only accepts a 4–20 mA signal, a transmitter with a 4–20 mA output must be chosen.

5. Materials

The materials used in the transmitter directly affect its corrosion resistance and service life. In environments with corrosive media, transmitters made of corrosion-resistant materials should be selected to ensure long-term reliability.

Installation Methods for High-Temperature Pressure Transmitters

1. Selection of Installation Location

(1) The transmitter should be installed in a location with stable pressure and minimal vibration or shock. Excessive vibration or impact may affect measurement accuracy and shorten the service life of the transmitter.

(2) Avoid installing the transmitter in areas with heavy steam, dust, or other contaminants, as these may interfere with normal operation.

(3) The installation location should allow easy access for operation and maintenance, making routine inspection and calibration convenient.

2. Installation Method

(1) Pressure transmitters are typically installed on pipelines or vessels using threaded or flanged connections. For threaded connections, proper sealing is essential to prevent media leakage. Sealant or gaskets can be used to ensure a reliable seal.

(2) During installation, ensure that the pressure port of the transmitter is properly aligned with the port on the pipeline or vessel to avoid inaccurate pressure readings caused by improper installation.

3. Electrical Connection

(1) Make electrical connections strictly according to the transmitter’s wiring diagram. Pay close attention to power supply polarity and voltage to ensure they meet the transmitter’s specifications.

(2) When connecting cables, ensure good insulation to prevent short circuits or electrical leakage. Cable conduits or protective tubing can be used to protect the cables from external damage.

4. Commissioning and Calibration

(1) After installation, the transmitter must be commissioned and calibrated. First, power on the device and check whether the output signal is normal.

(2) Use a standard pressure source to calibrate the transmitter, adjusting the zero point and span so that the measured values match the actual pressure. Calibration should be performed strictly in accordance with operating procedures to ensure accuracy.

Conclusion

Proper selection and correct installation of high-temperature pressure transmitters are critical to ensuring measurement accuracy and long-term reliability. In practical applications, all relevant factors—such as operating requirements and environmental conditions—should be carefully considered to select the appropriate transmitter and carry out proper installation, commissioning, and calibration.