Industry Pain Points and Solutions for Liquid Level Measurement Under High-Temperature Operating Conditions

Under high-temperature operating conditions, traditional level transmitters often face the industry pain point of a sharp decline in measurement accuracy. JUY high-temperature level transmitters adopt a 304 stainless steel cable-cylinder structure and combine innovative pressure-guiding technology to perfectly solve the challenge of water level measurement in extreme environments of 400℃. This article provides an in-depth analysis of how products in the TT20, JYB-KO-Y3 and other series ensure stable accuracy of ±0.5%FS through a triple temperature compensation mechanism.

I. Three Major Challenges of Liquid Level Measurement in High-Temperature Environments

In industrial scenarios such as petrochemical and metallurgy, high-temperature environments cause traditional level transmitters to experience the following problems:

• Material thermal deformation: Ordinary aluminum alloy housings undergo linear expansion above 300℃, causing displacement of the internal structure of the sensor
• Medium vaporization: High temperatures increase the vaporization pressure of the measured liquid, affecting the pressure transmission efficiency of the pressure-guiding pipeline
• Electronic drift: The core circuit experiences zero-point drift under continuous high temperatures, with typical errors reaching 2-3%FS

Taking a coke oil storage tank in a coking plant as an example, when using ordinary transmitters, manual calibration is required 3-4 times per month under 200℃ operating conditions, while JUY series products, through patented technology, achieve continuous operation for 6 months with an error of no more than 0.8%.

II. Core Advantages of the 304 Stainless Steel Cable-Cylinder Structure

JUY high-temperature pressure-guided level transmitters adopt an integral 304 stainless steel structure, offering significant advantages over traditional products:

The specially designed cable-cylinder structure (such as the LHBU model) adopts dual-layer corrugated tube isolation technology, effectively isolating the direct impact of thermal radiation on sensitive components. According to third-party testing, in a continuous 350℃ operating environment, the signal drift of the CYB31D transmitter is only 1/5 of that of conventional products.

III. Technical Analysis of the Triple Temperature Compensation Mechanism

JUY series products achieve temperature error compensation through the following innovative designs:

1. Dynamic zero-point calibration: Built-in PT100 temperature sensor automatically corrects zero-position deviation every 30 seconds
2. Pressure transmission optimization: The JYB-KO-Y3 model adopts a conical pressure-guiding chamber design to reduce the impact of high-temperature medium vaporization
3. Digital filtering algorithm: Thermal noise interference is eliminated in real time through a DSP chip, with sampling accuracy reaching 16bit

Actual test data show that the HD504 model can still maintain a measurement accuracy of 0.3-0.5%FS under the extreme operating condition of 400℃, far exceeding the requirements of the IEC 60770-1 standard.

IV. Typical Application Scenarios and Selection Guide

For different high-temperature scenarios, it is recommended to select the appropriate models:

• Boiler steam drum water level: BPH30D model (pressure resistance 6.4MPa, response time <50ms)
• Molten salt thermal storage system: ZD-136P model (special ceramic diaphragm, resistant to instantaneous high temperatures of 550℃)
• Petrochemical reactor: LHM-C70 model (explosion-proof certification Ex d IIC T6)

After adopting the TT20 model in an ethylene project, the liquid level control accuracy of the cracking furnace improved from ±2.5% to ±0.7%, reducing annual unplanned shutdown losses by more than 8 million yuan.

Technical Summary and Professional Service Support

As a national high-tech enterprise, Xi'an Shenghongchuang Instrumentation Co., Ltd. ensures that all JUY series products have passed:

• ISO9001:2015 quality management system certification
• CE/ATEX explosion-proof certification
• Third-party metrology institute type approval certificate

Our engineering team can provide full-process technical support from model selection consultation to installation and commissioning. Contact our technical consultants now to obtain customized solutions, or request detailed test reports for models such as HB874.