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Selection of integrated temperature and pressure sensors
2026-06-08
When selecting integrated temperature and pressure sensors, many users place orders based solely on the pressure range. Consequently, after installation, issues such as inaccurate temperature measurement, severe signal interference, or even complete system rework may occur—primarily due to failure to verify three critical parameters.
I Temperature range compatibility: Do not focus solely on pressure while neglecting temperature.
A temperature-pressure integrated sensor is essentially an integrated solution combining a pressure element and a temperature sensing element. The common configuration consists of a diffused silicon pressure element paired with a PT100 platinum resistance, with a pressure range of 0–60 MPa but typically a temperature range limited to –40°C to 125°C.
Common selection error:
When operating at 150°C, selecting a model rated for-40 to 125°C may prevent immediate burnout of the Pt100 Sensor; however, prolonged overheating will lead to resistance drift and accuracy degradation. During selection, ensure that the actual maximum operating temperature remains within 80% of the sensor's measurement range.
II Temperature Compensation Method: Automatic compensation is not enabled for non-integrated units
Temperature compensation for temperature-pressure integrated sensors exists in two types: built-in PT100 real-time compensation and MEMS digital compensation. The built-in PT100 approach offers high temperature measurement accuracy (±0.5°C) but requires dual signal outputs; MEMS digital compensation features high integration but its compensation accuracy is limited by the algorithm employed.
Selection recommendations:
For applications with significant temperature fluctuations, such as petrochemical processes and hydraulic systems, the PT100 real-time compensation solution is recommended due to its superior temperature measurement accuracy and reliable pressure correction; for applications with stable temperature ranges, such as HVAC systems and compressed air systems, MEMS-based digital compensation offers better cost-effectiveness.
III Output Signal Configuration: Do not confuse dual-channel output with single-channel multiplexing
The temperature-pressure integrated sensor provides three output signals: 4–20 mA dual-independent outputs (for pressure and temperature), a 4–20 mA + RS485 hybrid output, or a single-channel time-sharing multiplexed output.
Selection considerations:
While single-channel time-sharing multiplexing appears to save wiring, pressure and temperature data are out of sync during switching cycles, making it unsuitable for closed-loop control applications. The 4–20 mA dual-channel output offers the highest stability, simple wiring, and strong interference resistance, making it ideal for most industrial scenarios.
Additional reminder: Avoid common installation pitfalls
The integrated temperature-Pressure Sensor measures both the temperature and pressure of the fluid within the pipeline, with installation location directly affecting measurement accuracy. It is recommended to install it on straight pipe sections with a clearance of five pipe diameters before and after; avoid installing near elbows or valves; when measuring liquids, the sensor should be mounted downward or horizontally to prevent bubble accumulation.
When selecting an integrated temperature and Pressure Sensor, three essential parameters must be met: defined temperature range limits, appropriate compensation methods to ensure accuracy, and stable output signal transmission. If you're struggling with selection, please contact Weilian Fengran's sensing technology team—we provide comprehensive guidance for choosing integrated temperature-Pressure Sensors and sample testing services.
