Electromagnetic flowmeter is a common industrial flow measurement equipment, and its installation requirements are strict, which is directly related to the accuracy and long-term stability of the measurement. The following is a detailed description of the installation requirements of the electromagnetic flowmeter, the reasons and the problems that may be caused by not following the installation requirements.
1. Installation requirements of electromagnetic flowmeter
1.1 Pipe location requirements
• Straight pipe length:
• The upstream straight pipe section is generally required to be ≥5 times pipe diameter (D), and the downstream straight pipe section is required to be ≥3 times pipe diameter (D).
The downstream installation requirements are not met The downstream does not meet the installation requirements and is installed together with the regulator
• Avoid high vibration locations:
• Install in areas with low vibration of pipes or equipment.
• Avoid strong magnetic field interference:
• Keep away from strong electromagnetic interference sources such as large motors, frequency converters, and cables.
1.2 Fluid fills the pipe
• Installation position to ensure that fluid fills the pipe:
• The horizontal pipe installation of the flow meter is usually selected in the lower part of the pipe, there is a height difference at the outlet, and the vertical pipe installation flows upward to avoid gas or empty pipe phenomenon in the pipe during measurement.
The meter transmitter is installed horizontally, the original left and right distribution of the electrode becomes the upper and lower distribution, the upper electrode is easy to be affected by bubbles, and the lower electrode may be worn by impurities in the medium.
1.3 Grounding Requirements
• Good grounding:
• The ground resistance of the flow meter is usually required to be less than 10 ohms, and it should be grounded separately to avoid sharing the ground point with other equipment.
1.5 Fluid Conditions
• Avoid strong eddy or turbulent flow in the pipeline:
• Ensure that the fluid is flowing uniformly at the sensor.
Failure to meet installation requirements may cause unstable media flow
The junction box is below, and there may be water inlet risk after long-term use
2. Reasons for installation according to these requirements
2.1 Ensure the accuracy of measurement
• The working principle of the electromagnetic flowmeter is based on Faraday's law of electromagnetic induction, which requires a fluid to flow in a magnetic field to generate an induced voltage. Therefore, a uniform distribution of fluid velocity is essential.
• Insufficient straight pipe segments can cause turbulence or bias in the fluid flow, directly affecting the stability of the induced voltage and resulting in inaccurate readings.
2.2 Avoid Interference
• Strong electromagnetic fields and poor grounding can introduce interference signals, so that the sensor can not accurately perceive the weak induced voltage, affecting the stability and accuracy of the device
2.3 Ensure device service life
Bubbles, particles, and vibrations in the fluid may shock or interfere with the electrodes, affecting the life of the sensor.
3. Consequences of not following the installation requirements
3.1 Measurement error
• No straight pipe section:
• Upstream or downstream fluid flow disorder, electromagnetic flow meter induced voltage fluctuations, measurement results deviate from the true value.
• Fluid does not fill the pipe:
• The fluid does not completely cover the electrode, and the measurement signal is distorted or even impossible to measure.
• Strong vibration or bubble interference:
• The output signal is unstable and the data fluctuates greatly.
3.2 Device Faults
• Poor grounding:
• External electromagnetic interference into the flow meter circuit may result in false alarms or meter damage.
• Improper installation position:
• Long-term bubble shock or particle accumulation can wear the electrode and increase maintenance costs.
3.3 Running Interruption
• Failure of the flow meter to work properly may lead to a halt in the production process or instability in the process.
4. Conclusion
The installation requirements of the electromagnetic flowmeter are determined by its measuring principle and working characteristics. Strictly follow the installation requirements:
1. Ensure measurement accuracy;
2. Improve operation stability;
3. Extend the service life of the device.
Any behavior that does not install as required may lead to deviation of measurement data or even equipment failure, which poses risks to the production process. In order to avoid problems, the installation should carefully evaluate the site conditions and strictly follow the specifications.
Thank you
