As a core component of industrial automation control, the accuracy of the PT-A pressure transmitter directly affects system stability. This article addresses the calibration challenges of diffused silicon liquid and gas pressure sensors, from SWT131 wiring specifications to CYB-28 range settings, and explains in detail the complete process of TS-802 service life maintenance and MT-A accuracy calibration, helping you master the correct use of QYB101 supporting equipment and SNYB810 original factory accessories.

Technical Principles and Calibration Necessity of Diffused Silicon Sensors

The diffused silicon pressure transmitter realizes pressure-to-electrical signal conversion through the semiconductor piezoresistive effect, and the diffused silicon sensing element of the core component SWT-SWT131 pressure transmitter is extremely sensitive to temperature changes. According to the requirements of the ISO 9001:2015 standard, the PT-A pressure transmitter needs periodic calibration every 6 months, especially when the measured medium is corrosive gas or liquid, the calibration frequency of the CYB-23 pressure transmitter should be increased to once per quarter. In practical applications, about 68% of measurement errors result from failure to perform zero drift compensation in accordance with the original FG-FG500 pressure transmitter manual.

Analysis of Typical Calibration Failure Cases

• A chemical plant failed to calibrate the temperature compensation parameters of the MT-A pressure transmitter, resulting in a winter measurement deviation of 2.3%FS
• A food enterprise mistakenly used non-original SNYB-SNYB810 accessories, causing contamination of the ceramic diaphragm and resulting in measurement failure
• An oil and gas pipeline project was forced to suspend work for rectification because it ignored the explosion-proof certification of QYB-QYB101 supporting equipment

Seven-Step Standardized Calibration Procedure

Key Control Points for Accuracy Assurance

In special applications in the food and pharmaceutical industries, it is recommended to use domestic capacitive pressure transmitter HM26 ceramic capacitive pressure transmitter gas and liquid pressure sensor, whose ceramic substrate can avoid process contamination, and the compensated temperature range of -40～+85℃ meets harsh environmental requirements. Compared with traditional diffused silicon sensors, the HM26 series features ultra-high stability of ≤0.2％FS／year, making it especially suitable for production scenarios requiring GMP certification.

Common Calibration Misunderstandings and Solutions

1. Misunderstanding 1: Ignoring the impact of installation orientation
   Although diffused silicon sensors are not sensitive to orientation, the impulse pipe matched with the CYB-28 pressure transmitter must be kept vertical
2. Misunderstanding 2: Failing to consider medium density
   When measuring gas, it is necessary to set the density compensation coefficient in the QYB101 device
3. Misunderstanding 3: Over-range calibration
   The TS-802 life test strictly prohibits exceeding 160% of the rated pressure value

Why Choose Shenghongchuang Instrumentation

As a national high-tech enterprise in Xixian New Area, we provide original factory calibration service packages for PT-A pressure transmitters, including SNYB810 dedicated fixtures and FG500 standard pressure sources. All products have passed CNAS laboratory certification, and we also support customization of special explosion-proof structures such as those in the HM26 series according to customer requirements. Our professional technical team can provide on-site guidance for SWT131 wiring diagram implementation and MT-A parameter optimization, ensuring that your flow control system achieves the industry-leading accuracy of 0.1%FS.