Challenges in Selecting Liquid Level Transmitters for High-Temperature Operating Conditions

In high-temperature industrial scenarios such as petrochemicals and metallurgy, the stability of liquid level transmitters is directly related to production safety and efficiency. When the ambient temperature exceeds 80℃, ordinary straight-rod insertion liquid level transmitters often encounter problems such as signal drift and seal failure. This article focuses on the LC-502 and compares the performance differences of mainstream stainless steel liquid level sensors such as MIDA-DG-21 and DBS502 under extreme operating conditions, providing operators with a basis for selection decisions.

Comparison of Temperature Resistance: The Ultimate Test of Materials and Processes

1.LC-502 uses a 316L stainless steel body and a ceramic capacitive sensing element, and ensures full-range stability from -40~200℃ through an ISO 15848-certified welding process. Measured data show that after continuous operation for 500 hours in a 180℃ steam environment, its accuracy deviation remains controlled within ±0.2%FS.

2.MIDA-DG-21 Although rated for 150℃, its PTFE sealing ring is prone to creep under sustained high temperatures. A case at a refinery showed that this model had a leakage probability of 12% after 3 months of use under 135℃ operating conditions.

3.DBS502's silicone oil filling system is prone to cavitation when the temperature changes abruptly, and it is recommended that the operating temperature should not exceed 120℃. In comparison, the dry measurement technology of LC-502 completely avoids the risk of medium expansion.

Structural Design Analysis: From Thermal Radiation Protection to Stress Relief

Thermal Isolation Mechanism: The patented heat dissipation fin design of LC-502 (Patent No. ZL202010XXXXXX.X) can reduce the probe temperature by 15-20℃, while models such as JWP-801D still use a traditional single-layer protective sleeve structure.

Installation Adaptability: Compared with the fixed flange structure of BLH802, the universal rotating joint of LC-502 can compensate for the stress caused by pipeline thermal deformation, which is particularly important in boiler drum level monitoring in thermal power plants.

Comparison of Measured Data on Measurement Accuracy

Solutions for Special Operating Conditions

For ultra-high-temperature scenarios such as molten salt heat storage systems (300℃+), it is recommended to use the LC-502-HV high-temperature derivative model, whose equipped nitrogen purging system can effectively prevent coking on the sensor head. This solution has been verified in a Qinghai solar thermal power generation project, achieving 18 months of continuous operation without failure.

Selection Decision Tree and Maintenance Recommendations

1.80-150℃ range: Give priority to the LC-502 standard version, which offers better cost performance than similar products such as HD502

2.150-250℃ range: MB261 or LC-502-HV with an active heat dissipation structure must be selected

3.Maintenance Points: Check the condition of seals every 6 months to avoid systemic failures in models such as LDUSC caused by O-ring aging

Conclusion: Professional Matching Creates Long-Term Value

The engineering team of Xi'an Shenghongchuang Instrumentation Co., Ltd. recommends that liquid level measurement in high-temperature environments should not be decided solely based on initial procurement cost. With military-grade materials and modular design, the life-cycle cost of the LC-502 straight-rod insertion liquid level transmitter is more than 27% lower than that of conventional models such as DBS502. Welcome to call 029-XXXXXXX to obtain customized high-temperature solutions, and our engineers will provide you with free operating condition evaluation services.