Under high-temperature operating conditions, compared with traditional models such as LHBU liquid level sensor and TT20, JYB-KO-Y3, which one can measure more accurately? This article will compare the performance differences of CYB31D, HD504 and other series in ultra-high-temperature water level measurement from dimensions such as the stainless steel armored cable cylinder structure and the pressure-guided principle, providing professional reference for technical selection.

I. Core Challenges and Solutions for High-Temperature Liquid Level Measurement

In industries such as petrochemicals and electric power energy, high-temperature liquid level measurement faces many challenges, such as signal drift when the medium temperature exceeds 200℃ and accuracy degradation caused by thermal expansion of sensor materials. Traditional liquid level sensors (such as TT20, JYB-KO-Y3 series) mostly use ordinary 316L stainless steel materials, which are prone to metal fatigue under continuous high-temperature environments. LHBU high-temperature pressure-guided liquid level transmitter innovatively adopts a double-layer armored stainless steel cable cylinder structure, with the inner layer as a high-temperature-resistant alloy liner and the outer layer as a reinforced stainless steel sheath. It can withstand a maximum medium temperature of 450℃, and its thermal stability is more than 40% higher than traditional models such as CYB31D.

Key Performance Comparison: Thermal Drift Coefficient and Long-Term Stability

According to the GB/T 30052-2013 standard, "Performance Test Methods for High-Temperature Pressure Sensors", we conducted a 200-hour continuous high-temperature test on mainstream models:

II. Technological Evolution of the Pressure-Guided Measurement Principle

Unlike traditional diffused silicon sensors, LHBU and models such as HD504 and HB874 all adopt the pressure-guided measurement principle, transmitting pressure signals through sealing liquid. However, LHBU's differentiated advantages lie in:

• Dynamic temperature compensation algorithm: Integrates a PT100 temperature sensor to correct in real time the errors caused by changes in medium density
• Multi-stage damping design: Solves the pressure fluctuation interference problem of the JUY series under boiling operating conditions
• Ceramic diaphragm isolation technology: Compared with the metal diaphragm of LHM-C70, corrosion resistance is increased by 3 times

Measured Data Under Typical Operating Conditions

In a vacuum tower project of a certain refinery, LHBU and ZD-136P were installed simultaneously for testing:

1. When the medium temperature rose to 320℃, ZD-136P showed a measurement deviation of 0.4m
2. LHBU controlled the deviation within 0.08m through temperature compensation
3. After 90 days of continuous operation, LHBU's zero-point drift was only 1/3 of BPH30D

III. Engineering Adaptability of the Stainless Steel Armored Cable Cylinder Structure

To meet the installation requirements of high-temperature and high-pressure vessels, the LHBU liquid level sensor adopts a modular design:

• Rotatable flange: Supports 0-360° directional adjustment, solving the installation alignment difficulty of CYB31D
• Sectional cable sheath: More convenient for on-site maintenance than the integral structure of HD504
• IP68 protection rating: Performs better than the IP66 standard of JYB-KO-Y3 in steam environments

Selection Recommendations: Model Matching for Different Temperature Ranges

Choose the optimal solution according to the characteristics of the medium:

• 200-300℃: TT20 or JYB-KO-Y3 offers better cost performance
• 300-400℃: Give priority to LHBU or CYB31D
• Above 400℃: The specially customized version of LHBU must be used

IV. Maintenance Cost and Life Cycle Evaluation

Through failure statistics of models such as HB874, it was found that the main failure modes of high-temperature liquid level sensors include:

Summary and Professional Recommendations

Comprehensive test data and engineering practice show that the LHBU high-temperature pressure-guided liquid level transmitter has significant advantages in ultra-high-temperature water level measurement scenarios: thermal stability is 58% higher than TT20, and the maintenance cycle is extended to 5 years. For critical process links, it is recommended to give priority to the LHBU series certified by SIL2; for auxiliary measurement points, economical solutions such as CYB31D or HD504 may be considered.

As a national high-tech enterprise, Xi'an Shenghongchuang Instrumentation Co., Ltd. can provide a full range of liquid level measurement solutions from -200℃ to 450℃. Our engineering team is ready at any time to provide you with professional model selection support, click to consult for customized technical solutions.