How the PTX-PTX1200 Pressure Transmitter Works: An Analysis of the Core Technology of Diffused Silicon Sensors

The PTX-PTX1200 pressure transmitter uses advanced diffused silicon sensor technology to accurately measure liquid and gas pressure. This article provides an in-depth analysis of its working principle, helping technical evaluators understand the core advantages of diffused silicon sensors, and compares the features and application scenarios of models such as PTX-PTX7516 and PTX-PTX1240, providing professional reference for the selection of industrial flow control equipment.

1. Core Measurement Principle of Diffused Silicon Sensors

The diffused silicon pressure sensor is the core component that enables the PTX-PTX1200 to achieve high-precision measurement. Its working principle is based on the piezoresistive effect: when the silicon crystal is subjected to external force, the lattice structure deforms, causing a change in resistivity. The specific implementation process includes:

• Wheatstone bridge structure: four pressure-sensitive resistors are formed on the silicon diaphragm through ion implantation technology to create a full-bridge circuit
• Pressure transmission mechanism: the pressure of the measured medium is transmitted to the silicon sensing element through a stainless steel isolation diaphragm and filled silicone oil
• Signal conversion process: the resistance change caused by pressure is converted into a millivolt-level voltage signal output (typical sensitivity 2mV/V)

Compared with traditional strain gauge technology, diffused silicon sensors offer better temperature stability (±0.1%FS/℃) and long-term stability (±0.1%FS/year), which is a key reason why the PTX-PTX1200 is highly favored in industries such as chemical processing and petroleum.

2. Comparison of Key Technical Parameters of PTX Series Products

It is particularly worth noting that the PTX-PTX1200 adopts a special 316L stainless steel isolation diaphragm design, combined with a silicone oil filling system using a high-temperature curing process, enabling it to maintain excellent long-term stability even when measuring corrosive media. The PTX-PTX7535 model, by contrast, was developed for the food industry and features a hygienic structure compliant with FDA certification.

3. Key Selection Points in Industrial Applications

When selecting a diffused silicon pressure transmitter for flow control equipment, technical evaluators need to focus on the following factors:

1. Medium characteristics: for corrosive media, choose the CYB-43 series with a Hastelloy diaphragm; for viscous liquids, the flat diaphragm structure of PTX-PTX1240 is recommended
2. Accuracy requirement0.075%FSClean gasHVAC systems

   It is particularly worth noting that the PTX-PTX1200 adopts a special 316L stainless steel isolation diaphragm design, combined with a silicone oil filling system using a high-temperature curing process, enabling it to maintain excellent long-term stability even when measuring corrosive media. The PTX-PTX7535 model, by contrast, was developed for the food industry and features a hygienic structure compliant with FDA certification.

   
   

   3. Key Selection Points in Industrial Applications

   When selecting a diffused silicon pressure transmitter for flow control equipment, technical evaluators need to focus on the following factors:

   1. Medium characteristics: for corrosive media, choose the CYB-43 series with a Hastelloy diaphragm; for viscous liquids, the flat diaphragm structure of PTX-PTX1240 is recommended
   2. Accuracy requirements: for process control applications, PMP-PMP5074 with 0.1%FS accuracy is recommended, while SDD-XNSDD604 is more suitable for general monitoring purposes
   3. Environmental adaptability: in explosion-proof areas, the intrinsically safe NS-P424 should be selected; for outdoor installation, attention should be paid to the IP68 protection rating
   4. Signal output: PTX-PTX7535 with 4-20mA+HART protocol is suitable for long-distance transmission, while the RS485 output of SDD-XNSDD603 facilitates networking

   The engineering team of Xi'an Shenghongchuang Instrumentation Co., Ltd. recommends that when purchasing diffused silicon pressure transmitters such as PTX-PTX1200, specific parameters such as medium composition, operating temperature range, and pressure fluctuation frequency should be provided in order to match the most suitable sensor configuration solution.

   
   

   4. Solutions to Common Technical Problems

   In response to typical problems encountered by diffused silicon pressure sensors in practical applications, we summarize the following solutions:

   • Zero drift problem: perform zero calibration regularly (PTX-PTX1200 supports automatic zero tracking)
   • Medium crystallization blockage: choose the diaphragm self-cleaning design of PTX-PTX7516 or add a chemical seal
   • Lightning damage: equip PMP-PMP5073 with a dedicated lightning arrester, and the grounding resistance must be ≤4Ω
   • Signal interference: SDD-XNSDD604 is recommended to use twisted shielded cable, and the wiring distance should not exceed 1500 meters

   According to the GB/T 17614-2018 standard for transmitters used in industrial process control systems, diffused silicon pressure transmitters produced by regular manufacturers should provide at least a 36-month quality guarantee, such as the PTX series products provided by Xi'an Shenghongchuang, all of which have passed comprehensive testing by CNAS laboratories.

   
   

   Technical Summary and Purchasing Recommendations

   With its excellent measurement performance, the diffused silicon pressure transmitter has become the preferred solution in the field of industrial flow control. As a high-end model, PTX-PTX1200 performs outstandingly in terms of accuracy, stability, and media compatibility, making it especially suitable for harsh working conditions in industries such as chemical processing and energy. Models such as PTX-PTX7516 and PTX-PTX1240, on the other hand, have been optimized for specific application scenarios.

   Technical evaluators are advised to:

   • Give priority to products certified to SIL2 (such as PMP-PMP5074) for safety-critical systems
   • Require manufacturers to provide third-party test reports (such as the CE/ATEX certificates for PTX-PTX7535)
   • Conduct on-site inspections of the manufacturer's process equipment (the cleanroom requirement for diffused silicon chips should be ≥1000 class)

   As a leading sensor manufacturer in Northwest China, Xi'an Shenghongchuang Instrumentation Co., Ltd. can provide a full range of pressure measurement solutions from PTX-PTX1200 to CYB-43. Our engineering team is always available to provide professional selection support and technical consultation. You are welcome to contact us for the latest product catalogs and industry application cases.

   Call 029-xxxxxxx now or visit the official website www.sensor-tech.cn to obtain customized pressure measurement solutions.