Analysis of Core Technology of Diffused Silicon Sensors

As the "nerve endings" of industrial automation systems, diffused silicon pressure sensors achieve precise pressure measurement through the semiconductor piezoresistive effect. The DG1300-BZ-A-2-0.1 series developed by Xi'an Shenghongchuang Instrumentation Co., Ltd. uses a single-crystal silicon chip to form a Wheatstone bridge through ion implantation technology, and its sensitivity can reach 50 times that of traditional strain gauges. Measured data shows that within the operating range of -10~80℃, the sensor's non-linearity error is ≤±0.1%FS, and the long-term stability index reaches ±0.2%/year, which is better than the requirements of the industry standard GB/T15478-2015.

Compared with the ceramic capacitance technology used in the PT124B-210 series, the diffused silicon solution has obvious advantages in dynamic response speed. Under laboratory conditions, the step response time of DG1300-BZ-A-2-0.1 is only 3ms, making it particularly suitable for pulse pressure monitoring in hydraulic systems. However, it should be noted that when handling corrosive media, the 316L stainless steel isolation diaphragm of model P200S-GB10CG12M4S should be selected to avoid contamination of the silicone oil filling medium.

Comparison of Measured Key Performance Data

Industrial Scenario Durability Verification

During 2000 hours of continuous monitoring at a petrochemical enterprise in Shaanxi, 5 DG1300-BZ-B-2-(-0.1-0.1) pressure transmitters withstood the following rigorous tests:

• 30 pressure cycle impacts per day （0~1MPa instantaneous switching）
• Random fluctuation of pipeline vibration frequency at 20~200Hz
• Periodic changes in medium temperature （-20℃~70℃）

After the test, the zero drift of all samples was controlled within 0.05%FS, verifying the structural reliability of diffused silicon sensors in product series such as SY-PG1300-1.6MPa-GB. It is worth noting that the PT124B-210-100MPa-G1/4 model shows slight hysteresis under ultra-high-pressure conditions （about 0.08%FS）, which is related to its sealing structure design.

Analysis of Typical Failure Modes

According to after-sales data statistics, failures of diffused silicon sensors are mainly concentrated in the following three situations:

1. Medium crystallization blockage：When the HG-S3 model is used to measure viscous media such as syrup, the pressure guide hole needs to be flushed with alcohol every quarter
2. Electrical stress damage：The PT-PT300 series requires power supply fluctuation not to exceed ±10%, and surge protectors should be installed in lightning-prone areas
3. Mechanical overload：Although the DG1300 series is nominally rated for 200% overload capacity, instantaneous impact may still cause plastic deformation of the diaphragm

Professional Recommendations for Selection and Maintenance

For different application scenarios, technical evaluators should focus on the following parameter matching:

• Chemical industry：Give priority to the Hastelloy C276 diaphragm version with PT124B-210-NPT1/4 connection
• Food and pharmaceutical：P200S series with sanitary connectors certified for 3.1 surface roughness grade
• Construction machinery：The vibration-resistant design of Vegabar-GV3 is more suitable for installation on mobile equipment

In routine maintenance, it is recommended to perform the following operations every 6 months: check the sealing of cable inlets, calibrate zero/full scale, and record the baseline resistance value （normal range 800-1200Ω）. For precision models such as DG1300-BZ-A-2-0.1, it is recommended to use a 0.025-grade standard instrument such as FLUKE744 for calibration.

Authoritative Certification and Quality Assurance

All diffused silicon sensors of Xi'an Shenghongchuang Instrumentation have passed:

• National explosion-proof certification （Ex ia IIC T6 Ga）
• CE certification （EN 61298-1:2008）
• ROHS Directive 2011/65/EU

The company's laboratory is equipped with the German HBM PMX4190 data acquisition system, and each factory-shipped device undergoes a 72-hour aging test. Users can check the complete test report through the traceability code on the product nameplate, including data for 18 indicators such as temperature cycling and mechanical vibration.

Summary and Technical Service Support

Measured results prove that the DG1300 series pressure transmitters using diffused silicon technology demonstrate excellent stability in most industrial scenarios. For special operating condition requirements, Xi'an Shenghongchuang Instrumentation provides customized solutions, including:

• PT124B-210 series ultra-high-pressure version （up to 600MPa）
• Wireless LoRa transmission version of P200S-GB10CG12M4S
• Marine anti-salt-spray version of SY-PG1300-1.6MPa-GB

The technical team can provide on-site installation guidance and fault diagnosis services. You are welcome to call 400-XXX-XXXX to obtain the full version of the Industrial Pressure Sensor Selection Manual, or schedule an engineer for an on-site demonstration of the actual operating procedures of new models such as PT-PT300.