Core Technical Advantages of Diffused Silicon Hirschmann Pressure Sensors

The German Hirschmann diffused silicon technology used in the YM-1KGR pressure transmitter achieves high-accuracy conversion of pressure signals through the semiconductor piezoresistive effect. Its core lies in the Wheatstone bridge structure formed in single-crystal silicon material through ion implantation and high-temperature diffusion processes. When medium pressure acts on the 316 stainless steel isolation diaphragm, the resistance change generated by the silicon sensing element can reach 50 times that of traditional strain gauges. This technological approach enables this product series (including models such as YM-130 and YD-322) to maintain a total accuracy of ±0.1%FS within the medium temperature range of -30～+85℃.

Similar to the domestic general-purpose pressure transmitter CYT-1001 diffused silicon absolute pressure sensor, Hirschmann sensors demonstrate three major characteristics in industrial flow control: first, they capture pipeline pressure fluctuations in real time through a fast response time of ≤5 milliseconds (up to 90%FS); second, temperature drift is controlled within ±0.05%FS/℃ to ensure long-term stability; finally, multiple output signal options (4～20mA/0～10VDC, etc.) adapt to the requirements of different control systems.

Performance Verification in Typical Application Scenarios

• Petrochemical industry: In catalytic cracking units, the YM-1XH model is installed through an M20×1.5 thread to continuously monitor the pressure of 250MPa high-pressure reaction vessels, with annual stability deviation ≤0.2%FS
• Power station inspection: The PT-507 transmitter, equipped with a Gl/4 male thread, achieves 0～0.01MPa micro-pressure measurement in steam pipelines of thermal power generating units, with accuracy reaching Class 0.25
• Constant-pressure water supply: YM-1001 is used for closed-loop pressure control of the pipe network, with a range adjustment scope of ±20%, and combined with the PID algorithm to keep pressure fluctuations within ±1% of the set value

Key Parameter Interpretation and Selection Guide

Deeper Meaning of Model Specifications

Taking the YM-130 pressure transmitter as an example, its model code contains key information: "YM" represents the diffused silicon sensor type, "1" indicates a stainless steel housing with protection rating IP65, and "30" corresponds to a measuring range of 0～30MPa. Technical evaluators need to pay special attention to the distinction between absolute pressure measurement ranges (0～0.1MPa to 0～250MPa) and gauge pressure measurement ranges (0～0.01MPa to 0～250MPa). For example, in vacuum systems, the 0～-0.1MPa range version of YD-322 should be selected.

Practical Selection of Accuracy Class

When handling hydraulic control systems, the Class 0.5 accuracy of YM-115 is usually sufficient; however, for laboratory pressure calibration scenarios, products such as YM-109 with Class 0.1 accuracy should be selected. It is worth noting that actual accuracy is affected by the installation method——mechanical stress during threaded installation may introduce an additional error of 0.1～0.3%. In this case, the domestic general-purpose pressure transmitter CYT-1001 with a ceramic piezoresistive sensor can be selected to reduce the impact.

Fault Diagnosis and Maintenance Optimization Solutions

Common Problem Handling Manual

According to the YM-1QQ pressure transmitter manual, when 4～20mA signal drift occurs, troubleshooting should be carried out in three steps: 1) check the grounding of the shielding layer of the electrical connection; 2) use the HART475 calibrator to verify zero point/full scale (adjustment range ±8%/±20%); 3) measure whether the power supply voltage is stable at 24±5VDC. For the E-05 error code displayed by YM-1XH, it usually indicates that the overload pressure exceeds the 300MPa limit, and it is necessary to check whether the isolation diaphragm is deformed.

Preventive Maintenance Strategy

1. Quarterly calibration: Refer to the YM-1001 calibration procedure and perform three-point calibration at three temperature points of 0℃, 25℃, and 70℃
2. Seal inspection: Apply fluororubber sealant to the M12×1 threaded interface to prevent moisture ingress that causes humidity to exceed the ≤95%RH standard
3. Electrical protection: The armor layer of the four-core shielded cable needs to be grounded at both ends to avoid signal fluctuations caused by frequency converter interference

Technical Summary and Industry Application Outlook

Through the integration of materials science and MEMS technology, diffused silicon Hirschmann sensors are redefining the upper limit of industrial flow control accuracy. From the ±0.1%FS total error of YM-1KGR to the 250MPa ultra-high-pressure measurement capability of PT-507, these devices demonstrate strong adaptability in scenarios such as building automation and metallurgy. With the popularization of IoT technology, future versions may integrate the RS485-Modbus protocol to achieve more intelligent pressure pipe network monitoring.

As a national high-tech enterprise, Xi'an Shenghongchuang Instrumentation Co., Ltd. can provide users with complete pressure measurement solutions including the YM series. If you need selection recommendations for specific working conditions or detailed technical materials such as the YM-109 wiring diagram, please feel free to contact our engineering team for dedicated consultation.