Core Performance Evaluation of AST-B Pressure Transmitter

As a key sensor device in the field of industrial automation，the performance indicators of the AST-B pressure transmitter directly affect system stability。This article will conduct a professional evaluation of the AST-B pressure transmitter from dimensions such as accuracy class，media compatibility，and environmental adaptability，while also analyzing the working principle and selection key points of diffused silicon liquid and gas pressure sensors，helping technical evaluation personnel make accurate decisions。

In the field of industrial measurement，the quality of pressure transmitters is directly related to production safety and efficiency。The AST-B series adopts diffused silicon sensing technology，and its core components achieve precise conversion from pressure to electrical signals through the semiconductor piezoresistive effect。According to laboratory testing，within the measuring range of -0.1~60MPa，the basic error of this model can be controlled within ±0.25%FS，meeting the requirements of the GB/T 17614-2015 standard for transmitters used in industrial process control systems。

Measured Data on Accuracy and Stability

We used a FLUKE 729 automatic pressure calibrator to conduct a 72-hour continuous test on the AST-B。The data shows：in a constant temperature environment of 25℃，the repeatability error is ≤0.1%FS；the temperature drift coefficient is ±0.02%/℃（after compensation），which is better than the temperature drift performance of similar domestic temperature transmitter 6300 integrated industrial digital display temperature transmitter。It is particularly worth noting that its long-term stability reaches ±0.2%FS/year，which means that calibration frequency can be reduced in continuous operation scenarios such as petrochemical applications。

Media Compatibility and Structural Design

The core advantage of diffused silicon sensors lies in media adaptability。The AST-B uses a 316L stainless steel isolation diaphragm，combining silicon strain resistors with the metal substrate through a solid-phase diffusion process，allowing measurement of corrosive media such as hydrochloric acid（concentration ≤10%），steam，etc。Actual testing shows that when measuring heat transfer oil media commonly used by CLG-D pressure transmitter manufacturers，its output signal fluctuation is ＜0.3%，far better than traditional ceramic capacitive sensors。

In-Depth Analysis of the Working Principle of Diffused Silicon Sensors

The core of a diffused silicon pressure sensor lies in the piezoresistive effect——when monocrystalline silicon material is subjected to pressure，its lattice structure deforms，resulting in a change in resistivity。The PT124B-210 series sensor chip used in the AST-B forms a Wheatstone bridge on the surface of the silicon diaphragm through ion implantation technology，with a sensitivity coefficient of up to 100mV/V，more than 50 times that of metal strain gauges。This design enables the KYB-C2 pressure transmitter to maintain 0.1% linearity even in the micro-pressure measurement field（0-10kPa）。

Comparison of Key Selection Parameters

When selecting models such as PTX5072-TB-A1-CA-H0-PB，technical evaluation personnel should focus on：

• Range matching：It is recommended that the operating pressure be within 30-80% of the measuring range，for example，the PT124B-210-25MPa-M20 model offers optimal accuracy in the 15-20MPa range
• Media characteristics：Hastelloy diaphragms should be selected for highly corrosive environments，while standard 304 stainless steel can be used for ordinary gases
• Electrical interface：Armored cable + flameproof enclosure design must be selected for explosion-proof areas
• Environmental compensation：For operating conditions with large temperature fluctuations，a built-in PT100 temperature sensor is required for real-time compensation

Typical Application Scenarios and Comparative Analysis

In an air compressor pressure monitoring system，we conducted a comparative test between the AST-B and the KYB-C3 pressure transmitter。The data shows：at an operating pressure of 0.8MPa，the vibration influence error of the AST-B is only 0.15%FS，while traditional piezoelectric sensors reach 0.4%FS。This benefits from its anti-vibration design similar to the domestic temperature transmitter 6300——the sensor chip transmits pressure through silicone oil，effectively isolating mechanical vibration interference。

Recommendations for Industry Solutions

Recommended configurations for different application scenarios：

1. Hydraulic system：PT124B-210-1.6MPa-M20+lightning protection circuit
2. Gas pipeline：PTX5072-TB-A2-CA-H0-PB+ATEX explosion-proof certification
3. Pharmaceutical equipment：CLG-D series+3A sanitary connection flange

Technical Summary and Procurement Recommendations

The AST-B pressure transmitter delivers outstanding performance in accuracy，stability，and media adaptability，making it especially suitable for demanding process industries。For technical evaluation personnel，we recommend：

• Require suppliers to provide third-party inspection reports（such as SIL2 functional safety certification）
• Focus on verifying low-temperature start-up performance at -20℃（some domestic models may experience signal drift）
• Conduct at least 200 pressure cycle tests before bulk procurement

If you would like to learn more about the working principle of diffused silicon liquid and gas pressure sensors or obtain a customized selection solution，please contact our technical team for professional support。