Analysis of Unstable Signal Issues in Diffused Silicon Hessman Pressure Sensors

Is the remote transmission signal of the CPS-2016 pressure transmitter unstable? As a core component in industrial control, the stability of diffused silicon Hessman sensors directly affects system accuracy. This article addresses common faults of models such as VEGABAR/VEGABAR14 and YM-1JY, and provides technical evaluation personnel with a complete solution for diffused silicon Hessman pressure sensors, from principle analysis to installation and maintenance.

I. Working Principle and Signal Transmission Mechanism of Diffused Silicon Hessman Sensors

Diffused silicon Hessman pressure sensors use the silicon piezoresistive effect principle. When external pressure acts on the sensing element, the Wheatstone bridge outputs a millivolt-level signal proportional to the pressure. Taking the VEGABAR14 pressure transmitter as an example, its built-in signal conditioning circuit converts the original signal into a 4-20mA standard output. During remote transmission, it is susceptible to interference from the following factors:

• Electromagnetic interference: electromagnetic fields generated by equipment such as frequency converters and high-power motors may couple into the signal line
• Ground loop: potential differences caused by multi-point grounding may lead to signal drift (common in models such as PTG485)
• Cable attenuation: long-distance transmission models such as SP-112G require special attention to cable impedance matching issues

II. Typical Fault Troubleshooting Process (Taking CPS-2016 as an Example)

III. Key Points for Installation and Maintenance

According to the installation specifications of the PRC-905 pressure transmitter, special attention should be paid to:

1. Mechanical installation: the threaded connection of model SP-111G should be tightened with a torque wrench (see the dimensional drawing attachment for recommended values)
2. Electrical connection: the waterproof connector of YM-1JY needs to be coated with conductive grease to prevent electrochemical corrosion
3. Regular maintenance: check the aging condition of the sealing ring of VEGABAR series sensors once every 6 months

IV. Alarm Function Configuration and Signal Enhancement Solutions

For the TPT503 model with alarm control, it is recommended to use the following parameter settings:

• High alarm point: not exceeding 90% of the range (refer to the PTG485 specification)
• Deadband range: set to 2-3% of the range to avoid false operation
• Signal enhancement: connect a relay amplifier in series in the CPS2016 remote transmission line

Professional Technical Support and Warranty Services

Xi'an Shenghongchuang Instrument Co., Ltd. provides a 1-year warranty for all diffused silicon Hessman pressure sensors (including industrial-grade models such as PRC-905). Our technical team can provide:

• On-site fault diagnosis services (covering major industrial areas nationwide)
• Customized signal conditioning solutions (especially suitable for special working conditions such as SP-112G)
• Free access to the latest version of the VEGABAR14 installation and maintenance manual

Contact our technical consultants now to obtain sensor optimization solutions tailored to your specific working conditions, or request a complete technical data package for models such as HBP-800D.