DN18LDE Insertion Electromagnetic Flowmeter Installation Pitfall Guide: 3 Cases Tell You How to Avoid 90% of Measurement Errors

Improper installation of the DN18LDE insertion electromagnetic flowmeter can lead to measurement errors as high as 90%！Through 3 real cases, this article provides an in-depth analysis of common installation misconceptions for electromagnetic flowmeters such as the DNLDJ and L-MAG series, helping technical evaluators avoid key issues such as PTFE lining damage and sensor position deviation, thereby ensuring liquid flow measurement accuracy.

Case 1: Measurement Error Caused by PTFE Lining Damage

In the water treatment system of a chemical enterprise, technicians installed a DNLDJ electromagnetic flowmeter to measure the flow of acidic liquid. However, in less than one month of use, the flowmeter's measurement data showed obvious deviation, with the error reaching as high as 15%. After inspection, it was found that the PTFE lining had suffered severe wear and corrosion.

Cause Analysis:

• During installation, the operation manual requirements were not strictly followed, and inappropriate tools were used, causing scratches to the PTFE lining
• The medium contained tiny solid particles, and long-term scouring caused lining wear
• After installation, sufficient sealing inspection was not carried out, causing the medium to penetrate and damage the lining

Solution:

1. Use dedicated installation tools to avoid mechanical damage
2. When the medium contains solid particles, it is recommended to install a pre-filter
3. Carry out a 24-hour sealing test after installation is completed

Case 2: Inaccurate Measurement Caused by Sensor Position Deviation

When a wastewater treatment plant installed an L-MAG electromagnetic flowmeter, due to pipeline space limitations, the sensor was installed in a non-ideal position. After being put into use, it was found that the measurement data fluctuated greatly, with the maximum error reaching 20%.

Root Cause of the Problem:

• The sensor was installed less than 5 pipe diameters downstream of the pipeline elbow
• There were interference sources such as valves near the installation position
• The fluid in the pipeline had not reached a fully developed flow state

Key Points for Correct Installation:

Case 3: Signal Interference Caused by Poor Grounding

When a food factory used an LDC-2A electromagnetic flowmeter to measure syrup flow, it found that the measured value jumped frequently and could not remain stable. After testing, the problem was found to lie in the grounding system.

Common Grounding Problems:

• Using ordinary electrical wire instead of dedicated grounding cable
• Ground resistance greater than 4Ω
• Poor insulation between the sensor and the pipeline

Professional Grounding Recommendations:

1. Use a copper-core grounding cable with a cross-sectional area of ≥4mm²
2. Ensure grounding resistance ≤1Ω
3. Use an equipotential grounding method

Electromagnetic Flowmeter Installation Quality Inspection Checklist

To ensure the installation quality of electromagnetic flowmeters in the DN18LDE, ARSLDE and other series, it is recommended to carry out inspection according to the following checklist:

Summary and Professional Recommendations

From the analysis of the above 3 typical cases, it can be seen that the installation quality of the DN18LDE insertion electromagnetic flowmeter directly affects measurement accuracy. As a professional supplier of flow control equipment, Xi'an Shenghongchuang Instrumentation Co., Ltd. recommends:

• Strictly follow the installation manual provided by the manufacturer
• Attach importance to environmental assessment before installation
• Establish a sound installation quality inspection system

For different models of electromagnetic flowmeters such as ZFG-F and LDT-50D, although the specific parameters may vary, the core installation principles are the same. We provide professional installation guidance services to ensure that your flow measurement system achieves optimal performance.

Contact our technical team now to obtain an electromagnetic flowmeter installation solution tailored to your specific working conditions, and avoid measurement errors and economic losses caused by improper installation.