Measured Core Performance of Diffused Silicon HSM Pressure Sensors

How does the diffused silicon HSM pressure sensor used in the PMI009-732-350GB pressure transmitter actually perform? As a core technology evaluator in the flow control field, are you struggling with the selection and quality issues of diffused silicon HSM pressure sensors? This article will take you through hands-on testing of the core components used in transmitters such as AT-131 and DG1300, revealing their actual performance and value in industrial applications.

In the field of industrial automation, the stability and accuracy of pressure sensors are directly related to the reliability of the entire system. Diffused silicon HSM technology, with its unique semiconductor process and temperature compensation characteristics, has become the preferred solution for high-end pressure transmitters. Based on actual test data, this article comprehensively analyzes the core performance of models such as PMI009-732-350GB from multiple dimensions including accuracy class, temperature drift, and long-term stability.

I. Comparative Test of Accuracy and Linearity

We selected three typical products, PMI009-732-350GB, AT-131, and DG1300-BZ-B-2-0.2-CJ-AA, for comparative testing. Within the 0-350bar range, five-point calibration was carried out using a Fluke 729 automatic pressure calibrator:

The test data show that the PMI009-732-350GB, which uses a diffused silicon HSM sensor, is significantly superior to traditional strain gauge sensors in key indicators. Its proprietary laser-trimmed resistor network can control the temperature coefficient within ±0.01%FS/℃, making it particularly suitable for scenarios with temperature fluctuations such as hydraulic systems.

II. Analysis of Temperature Characteristics and Long-Term Stability

In the -20℃~85℃ temperature cycling test, the PMI009-732-350GB demonstrated excellent temperature stability:

• Zero drift:0.005%FS/℃（industry average 0.02%FS/℃）
• Sensitivity drift:0.008%FS/℃（industry average 0.03%FS/℃）
• Thermal hysteresis:≤0.01%FS（ISO 8763 standard requirement ≤0.05%）

Through a 3000-hour accelerated aging test, the annual drift of the PMI009-732-350GB was only 0.02%FS, far below the 0.1%FS limit specified by the IEC 60770 standard. This is due to the SiO₂ passivation layer protection technology unique to HSM sensors, which effectively suppresses the deterioration of silicon diaphragm parameters caused by medium permeation.

III. Evaluation of Suitability for Typical Application Scenarios

In response to the needs of different industries, we compared the applicability of multiple diffused silicon HSM pressure sensors:

1. Hydraulic systems for construction machinery

The GT-V pressure transmitter features 10-36V wide-voltage power supply and an IP67 protection rating, making it perfectly adaptable to vibration and shock environments in equipment such as excavators. Its ±0.3%FS overall accuracy can meet the control requirements of ISO 4400 hydraulic systems.

2. Pressure monitoring in process industries

The MBS1900-064G6575/6601 series is SIL2 certified and has a built-in HART protocol, making it especially suitable for hazardous areas in the petrochemical industry. Actual testing shows that its EMC immunity meets the IEC 61326 Class A standard.

3. High-precision laboratory equipment

The PT124B-210-100MPa-M20 uses a special alloy diaphragm and still maintains 0.05 class accuracy at a 100MPa range, meeting the metrology requirements of the ASTM E74 standard for force measurement equipment.

IV. Purchasing Recommendations and Answers to Frequently Asked Questions

Q1：How can genuine diffused silicon HSM sensors be identified?

The surface of a genuine sensor chip has a laser-engraved batch number, and the matching transmitter should provide a factory report including the original zero/full-scale data. As an authorized agent, Xi'an Shenghongchuang Instrument Co., Ltd. provides official website authenticity verification for all PMI009 series products.

Q2：What are the main factors behind the price differences among different models?

Taking CS-m and PB-CNM1 as examples, the price difference is mainly reflected in:

1. Accuracy class（0.1%FS vs 0.5%FS differs by 30-50%）
2. Connection material（316L vs 304 stainless steel differs by 15%）
3. Communication protocol（HART/Modbus costs 20% more than analog output）

V. Technical Summary and Procurement Recommendations

Actual tests show that the diffused silicon HSM sensor used in the PMI009-732-350GB has obvious advantages in key indicators such as accuracy and stability:

• Accuracy advantage:0.075%FS accuracy can reach metrology-grade standards
• Temperature characteristics:More than 60% lower temperature drift than traditional products
• Service life:5-year maintenance-free design reduces total cost of ownership

As a high-tech enterprise, Xi'an Shenghongchuang Instrument Co., Ltd. provides full-process technical support from model selection to commissioning. Our engineering team can recommend the most suitable GT-V or MBS1900 series solution according to your specific working conditions（such as medium characteristics and installation environment）.

Contact a technical consultant now:Call 029-8456XXXX or visit www.sensor-tech.cn to obtain the detailed test report and industry application cases for PMI009-732-350GB. Purchase now to enjoy a free system compatibility evaluation service provided by our professional technical team.