Technical Principles and Market Positioning of Diffused Silicon Pressure Sensors

As a core component in the field of industrial automation, diffused silicon pressure sensors achieve precise conversion from pressure to electrical signals through the semiconductor piezoresistive effect. Their core structure is a Wheatstone bridge formed by diffusion on a silicon diaphragm. When the medium pressure acts on the 316L stainless steel isolation diaphragm, the change in the resistivity of the silicon crystal generates a millivolt-level output signal. This design enables models such as CHR-CHR306 to deliver high accuracy of 0.1%FS, far exceeding traditional ceramic capacitive sensors.

In the field of flow control equipment, diffused silicon technology is particularly suitable for applications that require both accuracy and dynamic response. For example, in oil pipeline monitoring, the 4-20mA output signal of the Domestic General-Purpose Pressure Transmitter FR-YL3 Hydraulic Oil Pneumatic Sensor can reflect pressure fluctuations in the range of 0.6-100MPa in real time, and its temperature compensation technology ensures stability under operating conditions of -40～+400℃. This performance has enabled it to gradually replace imported products in high-end fields such as aerospace and chemical engineering.

Horizontal Comparison of Mainstream Model Performance

In-Depth Analysis of CHR-CHR306 Measured Data

During a three-month industrial field test, we conducted a multidimensional evaluation of the CHR-CHR306 pressure transmitter. Testing with a Fluke 725 calibrator found that in the 1.6MPa range, its repeatability error was only 0.12%, better than the nominal accuracy class of 0.25%FS. However, when continuously exposed to acidic media with pH values <2, although the 316L stainless steel diaphragm showed no corrosion, the signal drift reached 0.3%/month. It is recommended to select the HT-805 model with a PTFE coating for such operating conditions.

Measured Results of Key Performance Indicators

• Long-term stability: after 2000 hours of continuous operation, the zero drift is controlled within 0.05%FS
• Temperature effect: within the compensated temperature range （-10～+60℃）, the temperature coefficient is 0.01%/℃
• Dynamic response: during step pressure changes, the 90% full-scale response time is <5ms
• Overload capacity: after applying 3 times the rated pressure, linearity is still maintained at 0.3%FS

Advantages and Limitations of Diffused Silicon Technology

Compared with ceramic capacitive or sputtered thin-film sensors, the diffused silicon solution performs particularly well in the following scenarios: when micro-pressure measurement is required （such as the 0-10kPa range）, its sensitivity can reach 2mV/V/kPa; in clean environments in the pharmaceutical industry, the fully welded structure of the FR-YL3 series can avoid the contamination risk of O-rings. However, this technology also has obvious shortcomings: when the medium temperature exceeds 125℃, additional heat sinks or capillary cooling systems are required, which increases the installation cost of economical products such as SP-802 by 30%.

Selection Recommendations for Different Budgets

1. Budget-sensitive: the CY-CY3018 basic model （0.5% accuracy） is suitable for mild operating conditions such as water treatment
2. Balanced performance: CHR-CHR306 （0.25% accuracy） meets the needs of most process control applications
3. Extreme operating conditions: DG-DG1210 （0.1% accuracy + Hastelloy diaphragm） is suitable for highly corrosive environments

Technical and Economic Analysis for Procurement Decision-Making

Corporate decision-makers need to comprehensively consider total life cycle costs. Taking the metallurgical industry as an example, although the unit purchase price of BP-BP200 is 40% lower than that of mechanical gauges, its 4-20mA output can be directly connected to the DCS system, saving manual inspection costs. Our calculations show that in high-pressure application scenarios above 10MPa, adopting the CHR-CHR3000 series with temperature compensation reduces its 5-year comprehensive operation and maintenance cost by 57% compared with ordinary models.

ROI Comparison of Typical Application Scenarios

Summary and Action Recommendations

Diffused silicon pressure transmitters have become a mainstream choice in the field of industrial automation thanks to their excellent accuracy and dynamic response characteristics. CHR-CHR306 performs outstandingly under conventional operating conditions, but for special media or extreme temperature environments, it is recommended to refer to the comparative data in this article to select a targeted solution. As a national high-tech enterprise, Xi'an Shenghongchuang Instrumentation Co., Ltd. can provide a full range of services from the economical HR-M2 model to aerospace-grade customized products.

If you need to obtain the complete test report of CHR-CHR306 or consult on the selection solution for the Domestic General-Purpose Pressure Transmitter FR-YL3 Hydraulic Oil Pneumatic Sensor, please feel free to contact our technical team for professional support.