The Core Principles and Technical Advantages of Diffused Silicon Hirschmann Pressure Sensors

This article provides an in-depth analysis of the working principles of diffused silicon Hirschmann pressure sensors, with a focus on the core technologies of the ZFBY-ZFBY3801 transmitter. As a flagship product of Xi'an Shenghongchuang Instrumentation Co., Ltd., this sensor has been widely used in the field of flow control due to its high accuracy, stability, and reliability. By understanding the display principles, wiring methods, and troubleshooting procedures of product series such as PTS501 and AO-X, operators can better master the usage techniques of diffused silicon Hirschmann pressure sensors.

I. Diffused Silicon Sensing Principle and Structural Design of ZFBY-ZFBY3801

The core of the diffused silicon Hirschmann pressure sensor lies in the piezoresistive effect of a monocrystalline silicon chip. When external pressure acts on the sensor diaphragm, the silicon lattice structure deforms, causing its resistance value to change linearly. The ZFBY-ZFBY3801 transmitter adopts an all-welded stainless steel isolation diaphragm design, with an integrated internal temperature compensation circuit, and can convert pressure signals within the range of -0.1~60MPa into a standard 4-20mA output, with an accuracy rating of up to 0.1%FS. Compared with traditional ceramic capacitive sensors, its response time is shortened to ≤1ms, making it particularly suitable for pressure monitoring of fast pulsating fluids.

• Wheatstone bridge configuration：four groups of diffused resistors form a full-bridge circuit, increasing sensitivity by 30%
• Media compatibility：the 316L stainless steel diaphragm can withstand corrosive media（such as H2SO4、NaOH solutions）
• Temperature adaptability：built-in PT100 temperature sensor, operating range -40℃~125℃

II. Interpretation of Key Parameters and Selection Guide

Taking the TMS-GH186 and YH-A series as examples, the following aspects should be emphasized when selecting specification models of diffused silicon Hirschmann pressure sensors：

Under high-temperature operating conditions, it is recommended to use it together with the domestic integrated industrial digital-display temperature transmitter RS-WB200. It uses a K-type thermocouple for temperature measurement and can withstand ambient temperatures up to 1300℃, forming a complete fluid monitoring system together with the pressure sensor.

III. Typical Fault Diagnosis and Calibration Methods

For the common zero drift issue of the BP-IN series, it can be handled through the following steps：

1. Disconnect the power supply and check the BP-IE wiring diagram to ensure the 24V power supply polarity is correct
2. Apply 50% range pressure using a standard pressure source and observe the deviation of the AO-X display value
3. Adjust the Zero and Span parameters through a HART communicator（the BP-IF calibration procedure must comply with the JJG882-2019 regulation）
4. If the diaphragm is blocked by crystallization, the measuring chamber can be flushed with 5% dilute hydrochloric acid

For signal fluctuation in the TMS series, the cause is usually poor grounding. It is recommended to use shielded cables and ensure the grounding resistance is ＜4Ω. A signal isolator can be installed if necessary.

Industrial Application Scenarios and System Integration Solutions

In the petrochemical industry, the PTS-PTS501 pressure transmitter is often combined with a turbine flowmeter to form a custody transfer metering system, and its ±0.075% accuracy meets the requirements of the GB/T18603-2014 standard. In the water treatment field, the BP-IB series, with its IP68 protection rating, can be submerged in sewage tanks for long-term monitoring of pump inlet and outlet pressure.

IV. Maintenance and Service Life Extension Strategies

Regular maintenance is the key to ensuring the long-term stable operation of sensors：

• Quarterly inspection：use a FLUKE754 calibrator for online calibration
• Seal replacement：fluororubber sealing rings are recommended to be replaced every 2 years
• Anti-freezing measures：in winter, the medium inside the measuring chamber should be drained to prevent ice expansion from cracking the diaphragm

For scenarios requiring multi-point temperature monitoring, the explosion-proof version of the domestic temperature transmitter RS-WB200 can be selected, and its Ex d IIC T6 explosion-proof certification is suitable for hazardous areas.

Summary and Technical Service Support

The diffused silicon Hirschmann pressure sensor solutions provided by Xi'an Shenghongchuang Instrumentation Co., Ltd. have been successfully applied in the automation control systems of large enterprises such as PetroChina and Baosteel. Our engineering team can provide full-process technical support from selection guidance to on-site commissioning, ensuring that the equipment delivers optimal performance.

Contact our technical consultants now to obtain the complete technical manual for the ZFBY-ZFBY3801 transmitter or customized solutions, Tel：029-XXXXXXX。