Technical Principles and Core Advantages of Diffused Silicon Pressure Sensors

As a mainstream solution for industrial pressure measurement, the diffused silicon sensor used in the PT-PT300 series pressure transmitter is based on the semiconductor piezoresistive effect. When the silicon diaphragm is subjected to liquid or gas pressure, the resistance value of its internal Wheatstone bridge changes precisely, and is converted into standard 4-20mA or 0-10V output through the signal conditioning circuit. Compared with traditional ceramic capacitive sensors, diffused silicon technology offers high accuracy of 0.1%FS and annual stability of ±0.25%, making it especially suitable for operating conditions requiring long-term stable monitoring, such as VEGABAR-GV3.

Structural Differences Among 7 Sensor Types

Through packaging process innovation, the R&D team of Xi'an Shenghongchuang Instrumentation Co., Ltd. has developed sensor variants suitable for different media:

• Isolated diaphragm type: Uses a 316L stainless steel isolation diaphragm to solve the lattice corrosion issue of PT124B-210-100MPa-G1/4 in corrosive media
• Oil-filled structure: Silicone oil pressure transmission ensures the measurement consistency of DG1300-BZ-A-2-0.1 under pulsating pressure conditions
• Direct welding design: Eliminates O-ring sealing, allowing SY-PG1300-1.6MPa-GB to maintain sealing performance even in a 150℃ high-temperature environment

In-depth Comparison of Industrial Application Adaptability

Special Media Handling Solutions

For the application of PT124B-210-100MPa-NPT1/4 in the chlor-alkali industry, we recommend using a Hastelloy C276 diaphragm combined with a PTFE impulse tube, which can effectively resist corrosion from wet chlorine gas. When DG1300-BZ-B-2-(-0.1-0.1) is used in the food and pharmaceutical sectors, polishing treatment certified to 3-A sanitary standards is required.

Analysis of Key Indicators for Selection Decision-Making

Technical evaluators should focus on the following parameters:

1. Long-term stability: The annual drift of high-quality diffused silicon sensors should be ＜0.1%FS, as with VEGABAR-GV3, which uses a temperature self-compensation algorithm
2. Media compatibility: For acidic media, it is necessary to check whether the diaphragm material complies with the ASTM B575 standard
3. Dynamic response: Scenarios such as injection molding machines require a response time of ＜1ms, and the PT-PT300 series uses digital signal processing

Key Points for Genuine Product Procurement Verification

There are products on the market in which ceramic sensors are passed off as diffused silicon products. It is recommended to verify through the following methods:

• Check whether the product nameplate is marked with the words "Diffused Silicon"
• Require the supplier to provide a third-party calibration report (such as CNAS certification)
• Measure whether the zero output is within 0.5mV/V (based on a 1MPa range)

Proven Industry Application Cases

In the reforming unit of a petrochemical enterprise in Shaanxi, the SY-PG1300-1.6MPa-GB pressure transmitter maintained Class 0.2 accuracy after 3 years of continuous operation. Its key innovations lie in:

• Using laser-welded sealing technology to avoid the aging issues of traditional adhesive sealing
• Built-in temperature sensor for real-time compensation, achieving ±0.5% accuracy within the range of -20~85℃
• Passed SIL2 functional safety certification, meeting the API 670 standard

Technical Summary and Procurement Recommendations

The 7 diffused silicon sensors in the PT-PT300 series cover pressure measurement needs ranging from vacuum to 100MPa. When selecting and purchasing, it is necessary to comprehensively consider media characteristics, environmental conditions, and measurement accuracy requirements. As a pressure transmitter manufacturer with 15 years of industry experience, Xi'an Shenghongchuang Instrumentation Co., Ltd. provides:

• Free operating condition analysis and selection guidance
• 48-hour rapid prototype testing service
• 3-year extended warranty commitment

If you need detailed technical manuals or customized solutions for models such as VEGABAR-GV3 and PT124B, please contact our engineering technical team immediately.