As the core device of industrial flow control, the calibration accuracy of the OC-1 pressure transmitter directly affects system stability. This article focuses on the characteristics of diffused silicon sensors and reveals 3 major calibration techniques to help you solve the accuracy drift problems of pressure transmitters such as PH-PH210 and OT-1 in gas/liquid media, improving contract execution efficiency.

Technical Challenges in Calibrating Diffused Silicon Pressure Sensors

In the field of flow control, diffused silicon sensors are widely used in pressure transmitters such as PH-PH210, OT-1, and OC-1 due to their high sensitivity and stability. However, three major factors, namely medium temperature fluctuations, residual mechanical stress, and electrical interference, often lead to accuracy drift. Taking the PT124B-213 model as an example, its temperature drift index must be controlled within ±0.05%FS/℃, which places stringent requirements on the calibration environment. According to ISO 9001 certification standards, the calibration process must cover tests of key parameters such as zero point, range, and nonlinearity.

Detailed Explanation of Three Core Calibration Techniques

1. Temperature Compensation Calibration Method

For the application characteristics of the domestic general-purpose pressure transmitter PT124B-213 diffused silicon vacuum pressure sensor in the wide temperature range of -30～+85℃, it is recommended to adopt stepwise heating calibration: first place the sensor in a constant temperature chamber, stabilize it for 30 minutes at every 10℃ interval starting from ambient temperature, and record the output value at each temperature point. By compensating for nonlinear temperature drift through software algorithms, the long-term stability of models such as DLT-DLT200 in turbo-generator units can be improved by 40%.

2. Dynamic Pressure Loading Technology

Traditional static calibration cannot reflect the actual performance of the SPB-SPB101 sensor under hydraulic pulses. Use a pneumatic/hydraulic pulse generator to simulate actual working conditions with a rise time of ≤5 milliseconds, and synchronously collect the output signal. Test data show that this method can reduce the repeatability error of the A-10 model in locomotive braking systems from 0.3%FS to 0.1%FS.

3. Multi-Point Linearization Correction

Conduct cyclic pressurization tests at five range points: 0%, 25%, 50%, 75%, and 100%, and fit the characteristic curve using the least squares method. For the application of the 501 pressure transmitter in the petrochemical industry, this method can improve the combined error from Class 0.5 to Class 0.25, meeting the requirements of the API 670 standard for critical unit monitoring.

Comparative Analysis of Industry Applications

Common Misunderstandings in Contract Execution

• Misunderstanding 1: Only performing single-point calibration. PM-PM200 requires verification at at least 3 pressure points in constant-pressure water supply systems
• Misunderstanding 2: Ignoring medium compatibility. The PT124B-213 made of 316 stainless steel requires special calibration in strong acid environments
• Misunderstanding 3: Not considering installation torque. Sensors with M20×1.5 threaded connections need to have mechanical stress checked before and after calibration

Why Choose Our Calibration Services

As a national high-tech enterprise, Xi'an Shenghongchuang Instrument Co., Ltd. has a CNAS-certified laboratory and can provide calibration services compliant with the GB/T 15478 standard for the full series of diffused silicon sensors such as PH-PH210 and OT-1. Our domestic general-purpose pressure transmitter PT124B-213 diffused silicon vacuum pressure sensor adopts laser marking traceability technology, ensuring that every calibration report is traceable to national measurement standards.