In the field of industrial pressure measurement, the performance of diffused silicon sensors directly affects production safety and efficiency. This article provides a measured comparison of mainstream pressure transmitters such as SMP-SMP135、SMP132、SMP131, and offers professional purchasing recommendations for technical evaluators from the dimensions of accuracy、stability、and media compatibility. As a high-tech enterprise, how do the diffused silicon sensors of Xi'an Shenghongchuang Instrumentation perform in the field of liquid and gas pressure measurement? Let the data speak for itself.

Technical Overview of Diffused Silicon Pressure Sensors

As the core component of industrial measurement, diffused silicon pressure sensors operate based on the piezoresistive effect——when the silicon diaphragm deforms under pressure, the resistance value of the embedded Wheatstone bridge changes, and a standard electrical signal is output through the signal conditioning circuit. Compared with traditional ceramic or metal strain gauge sensors, diffused silicon technology has significant advantages such as high sensitivity（typical value 0.1%FS）、excellent temperature characteristics（±0.5% compensation accuracy within the range of -20℃~85℃）、and good long-term stability（annual drift＜0.1%）. Xi'an Shenghongchuang Instrumentation uses imported German silicon wafers, and the JPE-JPE、HPB-HPB300 and other series of sensors manufactured through ion implantation and high-temperature diffusion processes have passed CE certification and RoHS testing, making them especially suitable for corrosive media and high-pressure environments.

Measured Comparison of Five Mainstream Transmitters

Measured data show that the SMP-SMP135 pressure transmitter still maintains ultra-high accuracy of 0.075% under a 10MPa range. It adopts a combination of a 316L stainless steel isolation diaphragm and a fluororubber sealing ring, and can withstand corrosive liquids with a PH value of 2-12. Compared with SMP132 and PY-PY212, the temperature drift coefficient of SMP135 is reduced by 60%. In a 72-hour continuous test of pipeline pressure monitoring in a refinery, the output fluctuation was only ±0.008mA. It is worth noting that although model 40-1012 is lower in price（the market quotation is about 15% lower than PB-PB8400）, its ceramic sensor is prone to zero drift in a steam environment, so it is not recommended for thermal systems.

Selection Guide for Industrial Application Scenarios

For different industrial scenarios, we provide specific recommendations: in the petrochemical field, priority should be given to the SMP-SMP135 with HART protocol, whose intrinsically safe explosion-proof design complies with ATEX standards; for the food and pharmaceutical industries, PB-PB8400 is recommended because its fully welded structure can pass 3A hygienic certification; for water treatment projects with limited budgets, the YS-2 pressure transmitter becomes a cost-effective choice with its IP68 protection rating and ±0.3% accuracy. The customization services provided by Xi'an Shenghongchuang can adjust threaded connections（G1/2、NPT1/4 etc.）、output signals（4-20mA/0-10V/RS485）and display modules to meet the requirements of special working conditions.

Analysis of Common Technical Misconceptions

• Misconception 1: The larger the range, the better - In practice, models should be selected with working pressure at 60-80% of the range. For example, when measuring 5MPa pressure, choose the 10MPa range HPB-HPB300 instead of the 25MPa model
• Misconception 2: Ignoring the effect of medium temperature - When the medium temperature is ＞85℃, a heat sink or capillary extension device must be selected, otherwise it will cause carbonization of the silicone oil filling fluid in the JPE-JPE sensor
• Misconception 3: Focusing only on initial accuracy - In industrial scenarios, more attention should be paid to long-term stability. Xi'an Shenghongchuang's SMP series provides a 36-month accuracy tracking service

Why Choose Shenghongchuang Instrumentation

As a high-tech enterprise in a national-level new area, we hold 18 patents related to pressure measurement. All products undergo 72-hour aging tests and -40℃~125℃ temperature cycling tests before leaving the factory. Compared with imported brands, the delivery cycle of the SMP-SMP135 pressure transmitter is shortened to 7 working days, and a 3-year warranty service is provided. Our technical team can provide full-process support from selection consultation to on-site installation guidance, and more than 200 process industry enterprises have already chosen our solutions. Contact 029-8456XXXX now to obtain a free sample test report, or visit the official website to view EMC test videos of products such as PB-PB8400.