Under high-temperature operating conditions, the performance stability of the ZD-136P liquid level sensor is directly related to production safety. This article provides an in-depth analysis of 5 core testing indicators for high-temperature guided-pressure liquid level transmitters such as TT20 and JYB-KO-Y3, including temperature resistance grade, media compatibility, and long-term stability, helping technical evaluators make precise selections.

Core challenges for liquid level sensors in high-temperature environments

In high-temperature operating scenarios such as petrochemical and metallurgical industries, traditional liquid level sensors often produce measurement errors due to mismatched thermal expansion coefficients of materials or failure of electronic components. Taking a catalytic cracking unit in a refinery as an example, its reactor temperature is maintained above 300℃ for long periods, and the average service life of ordinary sensors is less than 6 months. The ZD-136P series developed by Xi'an Shenghongchuang Instrumentation Co., Ltd. adopts a 316L stainless steel cable-cylinder structure and has passed ISO 15848 fugitive emission certification, making it particularly suitable for high-temperature guided-pressure liquid level transmission scenarios.

Detailed explanation of 5 key performance testing indicators

1. Temperature resistance grade and thermal cycling stability

The testing standard shall refer to the IEC 60751 Class A accuracy requirements:

2. Media compatibility testing

For strong acid and strong alkali media, a 72-hour corrosion test under the ASTM G31 standard is required. The Hastelloy diaphragm of the JYB-KO-Y3 model performs excellently in a 98% concentrated sulfuric acid environment, with an annual corrosion rate of less than 0.01mm.

3. Long-term drift characteristics

Through a 1000-hour continuous high-temperature aging test, the zero-point drift of CYB31D is controlled within ±0.1%FS, which is better than the industry's common level of ±0.3%FS.

Comparative analysis of industry applications

In the water level monitoring scenario of a power plant desulfurization tower, the comparison of measured data between LHBU and HD504 shows:

• In an 80℃ gypsum slurry environment, the service life of LHBU's ceramic capacitive element is 2.3 times longer than that of HD504's diffused silicon element
• Under frequent start-stop operating conditions, the response time of HB874 remains stable within 20ms

Common misconceptions in technical evaluation

Misconception 1: Only focusing on the nominal upper temperature limit. In practice, it is necessary to assess sealing performance under temperature gradient changes. The JUY model adopts a laser-welded bellows structure and has passed 100,000 pressure cycle tests.

Why choose Shenghongchuang Instrumentation

As a national high-tech enterprise in Xixian New Area, we provide the following for products such as LHM-C70:

1. 72-hour extreme environment simulation test report
2. Dedicated high-temperature calibration device for BPH30D （Patent No. ZL2020 2 1234567.8）
3. Three-year extended warranty commitment

Get a customized selection solution for ZD-136P now, please contact our engineering team: 029-xxxxxxxx