When purchasing the AT-131 pressure transmitter, how to identify a genuine diffused silicon sensor becomes the key

In the field of industrial automation control, the performance of pressure transmitters directly affects the stability and safety of the entire system. As a core component of flow control equipment, the AT-131 pressure transmitter is widely favored for its high accuracy and reliability. However, the market is flooded with products of varying quality, and how to accurately identify a genuine diffused silicon sensor has become the primary challenge faced by operators.

Diffused silicon pressure sensors, due to their excellent temperature characteristics and long-term stability, have become the preferred technology for industrial measurement. This article systematically analyzes the key purchasing points of mainstream models such as DG1300 and PH101, and provides you with professional selection guidance solutions from working principles to manufacturer qualifications.

Analysis of the core working principle of diffused silicon sensors

To accurately identify a genuine diffused silicon sensor, it is first necessary to understand its technical principle. Taking the XMLK-C21 pressure transmitter as an example, its core adopts the piezoresistive effect of monocrystalline silicon material: when external pressure acts on the sensitive element, the silicon diaphragm undergoes slight deformation, causing the resistance value of the embedded Wheatstone bridge to change, which is converted into a standard electrical signal output through precision circuitry.

Interpretation of key technical parameters

• Accuracy class: Genuine diffused silicon sensors usually reach 0.1%~0.5%FS, such as model SMP131-TLD-L356GS-D1-F-53-4M01
• Temperature compensation range: High-quality products have wide-temperature compensation capability from -40℃~125℃
• Long-term stability: Annual drift ≤0.1%FS is an important indicator for distinguishing genuine products

By comparing the technical manuals of models such as PT124B-210-1/4NPT, it can be found that genuine manufacturers clearly mark the specific test conditions and certification standards for these key parameters, while imitations often use vague wording or exaggerate performance.

4 key points for identifying legitimate manufacturers

There are many manufacturers on the market claiming to produce GT-V pressure transmitters, but only a few truly have R&D capabilities for diffused silicon sensors. The following are the core elements for identifying legitimate manufacturers:

Taking the DG1300-BZ-B-2-0.2-CJ-AA pressure transmitter as an example, legitimate manufacturers provide a complete factory inspection report, including measured data for 12 indicators such as zero output, full-scale output, and insulation resistance.

Practical methods for on-site verification of genuine products

For pressure transmitters such as model PMI009-732-350GB, operators can carry out on-site verification through the following methods:

Appearance inspection points

1. The housing material should be 316L stainless steel, with uniform welds and no burrs
2. The interface threads comply with the GB/T7306 standard, with clear threads
3. The nameplate information is complete, including key parameters such as model, range, and accuracy

Performance test methods

Use a standard pressure source to conduct a three-point test on the AT-131 pressure transmitter （0%、50%、100% range points）, and the linearity error of a genuine diffused silicon sensor should be ≤±0.1%. At the same time, conduct a temperature cycle test to observe whether the zero drift is within the allowable range.

Selection comparison guide for mainstream models

For different application scenarios, we have compiled a selection comparison table for common diffused silicon pressure transmitters:

Special reminder: when selecting models such as SMP131-TLD-L356GS-D1-F-53-4M01, special attention should be paid to the impact of medium temperature on sensor performance. When the medium temperature exceeds 80℃, it is recommended to choose a model with a heat sink or add a cooling device.

Professional purchasing recommendations and after-sales service assurance

As a pressure sensor manufacturer with 20 years of R&D experience, we recommend that users, when purchasing diffused silicon liquid and gas pressure sensors:

• Require suppliers to provide third-party inspection reports （such as SGS certification）
• Confirm the product warranty period （genuine products usually provide a 36-month warranty）
• Understand the manufacturer’s on-site technical support capabilities

All pressure transmitter products of Xi'an Shenghongchuang Instrumentation Co., Ltd. have passed CNAS laboratory certification, and each factory-shipped device comes with a traceable calibration certificate. Our technical team can provide full-process support from selection to installation and commissioning, ensuring that the equipment delivers optimal performance in your application scenario.

If you need detailed technical solutions for models such as DG1300-PJ-1-2-40-CJ-GK-GZ, or wish to consult about special customization services for the PH101 pressure transmitter, please feel free to contact our engineering expert team at any time. Click for online consultation or call 400-xxx-xxxx to obtain an exclusive selection manual and quotation solution.