Flow Measurement Challenges Under High-Temperature Conditions

In industries such as petroleum and petrochemical，metallurgy and other sectors，the proportion of operating conditions with medium temperature exceeding 150℃ is as high as 32%（according to the SGS 2023 industry report）。Traditional electromagnetic flowmeters such as the HQLDE-C series often have problems such as electrode polarization and weld deformation in this environment，causing measurement error to increase to ±5%FS。The Xi'an Shenghongchuang technical team improved the molecular structure of the PTFE weld lining，enabling the LDD electromagnetic flowmeter to still maintain ±0.5% accuracy during continuous operation at 200℃，and this breakthrough has obtained a national invention patent（ZL202310256789.X）。

Core Technical Innovation Analysis

Comparative testing shows that the triple-protection system adopted by the LDD series is significantly better than similar products：① Nanocrystalline alloy electrodes reduce the electrochemical corrosion rate by 83%；② The patented cooling wire design（patent no. ZL202210458632.1）keeps coil temperature rise within 45K；③ The dynamic compensation algorithm corrects in real time the impact caused by viscosity variation。In the 180℃ high-viscosity acidic medium test，the drift of the LDD electromagnetic flowmeter after continuous operation for 2000 hours is only 0.2%，while the same-series HQLDJ model drifts to 1.8%。

Key Performance Parameter Comparison

Typical Application Scenario Validation

In a tar metering project at a coking plant in Shaanxi，the LDD electromagnetic flowmeter successfully replaced the existing HQLDG model：① Under pipeline temperature 195℃ conditions，annual maintenance frequency dropped from 6 times to 1；② Downtime cost caused by metering disputes was reduced by 72%；③ Together with Shenghongchuang's SC-8000 control system，energy consumption was optimized by 11.6%。This case was selected as an excellent application case of the China Automation Association in 2023。

Selection Decision Guide

Technical evaluation personnel need to focus on：① Whether the process medium temperature exceeds the 120℃ critical point；② Whether there is a highly corrosive combination（such as high temperature+high-concentration dissolved ions）；③ Whether HART / Profibus communication protocol is required。For choosing between the LDC and LDD series，when the temperature＞160℃ it must be the D series special cooling version。

Why Choose Shenghongchuang

As a high-tech enterprise that is a key development focus in Xixian New Area，we have：① a CNAS-certified laboratory capable of simulating extreme-condition tests；② a 24-hour responsive technical expert team；③ 3-year extended warranty service。By consultation，you can obtain the complete test report and the《High-Temperature Flow Measurement Solution White Paper》，call 029-8856XXXX or visit www.sensor-tech.cn to get an exclusive selection solution。