The importance of electromagnetic flowmeter grounding and how to choose grounding

Once the installation location is determined, the next step is preparing the piping system. Ensure that the pipeline is clean and free from debris that could interfere with the operation of the flowmeter. In some cases, straight pipe runs are recommended both upstream and downstream of the flowmeter to allow for proper fluid flow development and stabilization. This helps in achieving optimal measurement accuracy.

The electromagnetic flowmeter should be installed with the flow direction aligned with the arrow on the flowmeter body. Proper orientation ensures that the magnetic field generated by the flowmeter’s coils is perpendicular to the fluid flow, allowing for accurate measurements. Additionally, it is essential to properly ground the flowmeter to minimize electrical noise and interference, ensuring the stability of the measurement signals.

The installation process involves securely mounting the flowmeter on the piping system using appropriate brackets or supports. Care should be taken to align the flowmeter properly and tighten all connections to prevent leaks. Adequate sealing measures must be implemented to prevent ingress of moisture or contaminants into the flowmeter, which could adversely affect its performance.

Now, the input impedance of the electromagnetic flowmeter converter has improved a lot, and the error is basically not caused by changes in the conductivity of the medium when the conductive liquid is conductive, but for a certain converter input impedance, the conductivity of the measured medium has a lower limit min, which cannot be lower than this lower limit.

Electromagnetic flowmeter in the industry has achieved good results, then as the core accessories of electromagnetic flowmeter – electrode, electrode is contact with the measured medium more accessories, then the cleaning details of the electrode is a crucial point, of course, also pay attention to a certain method.

Electromagnetic flow meters operate based on a fundamental principle of electromagnetic induction, providing an accurate and reliable method for measuring the flow of conductive fluids. The working principle involves Faraday’s law of electromagnetic induction. As a conductive fluid flows through a pipe, it cuts across the magnetic field generated by coils or electrodes mounted on the flow meter. According to Faraday’s law, an electromotive force (EMF) is induced in the fluid perpendicular to both the magnetic field and the flow direction. The induced EMF is directly proportional to the flow velocity of the fluid.

Typical fault diagnosis and treatment of electromagnetic flowmeter

After the initial debugging and normal operation for a period of time, the split electromagnetic flowmeter fails in the operation process, the common causes of failure are: the internal flow sensor connection layer, lightning strikes, environmental changes. Below, the staff of the flowmeter manufacturer will lead you to understand some common faults of the split electromagnetic flowmeter.

Electromagnetic flowmeter is a speed meter to measure the volume flow of conductive media. While carrying out on-site monitoring and display, it can output standard current signals for recording, adjustment and control, realizing automatic control of detection, and realizing long-distance transmission of signals. It can be widely used in water, chemical, coal, environmental protection, textile, metallurgy, paper and other industries in the flow measurement of conductive liquid. The structure of the instrument has one type and one type.

Performance Technical parameter
Size DN3-DN3000mm
Nominal Pressure 0.6-1.6Mpa(2.5Mpa/4.0Mpa/6.4Mpa…Max 42Mpa)
Accuracy +/-0.5%(Standard)     +/-0.3% or +/-0.2%(Optional)
Liner PTFE, Neoprene, Hard Rubber, EPDM, FEP, Polyurethane, PFA
Electrode SUS316L, Hastelloy B, Hastelloy C       Titanium, Tantalum, Platinium-iridium
Structure Type Integral type, remote type, submersible type, ex-proof type
Medium Temperature -20~+60 degC(Integral type)
Remote type ( Neoprene ,Hard Rubber ,Polyurethane ,EPDM) -10~+80degC
Remote type(PTFE/PFA/FEP) -10~+160degC
Ambient Temperature -20~+60deg C
Ambient Humidity 5-100%RH(relative humidity)
Measuring Range Max 15m/s
Conductivity >5us/cm
Protection Class IP65(Standard); IP68(Optional for remote type)
Process Connection Flange (Standard), Wafer, Thread, Tri-clamp etc (Optional)
Output Signal 4-20mA/Pulse
Communication RS485(Standard), HART(Optional),GPRS/GSM (Optional)
Power Supply AC220V (can be used for AC85-250V)
DC24V (can be used for DC20-36V)
DC12V (optional), Battery Powered 3.6V (optional)
Power Consumption <20W Alarm Upper Limit Alarm / Lower Limit Alarm Self-diagnosis Empty Pipe Alarm, Exciting Alarm Explosion Proof ATEX

One notable advantage of electromagnetic flow meters is their ability to measure bidirectional flow accurately. As the induced voltage is directly proportional to the fluid’s velocity, these meters are highly responsive to changes in flow rates, enabling real-time monitoring and control. Additionally, electromagnetic flow meters are not affected by factors such as temperature, pressure, or viscosity, ensuring consistent and reliable performance across diverse operating conditions. This working principle, coupled with their durability and low maintenance requirements, makes electromagnetic flow meters a preferred choice in industries requiring precise and stable flow measurements.

Electromagnetic flowmeters are classified according to the assembly method of converters and sensors, with split type and one type. Split type electromagnetic flowmeter is relative to the integrated, its components are: measuring tube, electrode, excitation coil, iron core and yoke housing. Used to measure the volume flow of conductive liquid and slurry in closed pipes.

Electromagnetic flowmeter is a kind of instrument to measure the flow of conductive fluid by using Faraday’s law of electromagnetic induction according to the electromotive force generated by the flow cutting magnetic field line. The common faults of electromagnetic flowmeter are: no display, inaccurate flow measurement, air traffic control alarm, system alarm, upper and lower limit alarm, etc.

Electromagnetic flowmeter is a kind of high precision, high reliability and long service life flow surface, which is composed of two parts: the sensor that directly contacts the pipeline medium and the upper end signal converter.

Sewage flowmeter can be widely used in municipal water supply, steel, petroleum, chemical, electric power, industry, water conservancy, water resources and other departments of liquid volume flow measurement, especially suitable for channels, small river flow measurement and environmental protection disposal of sewage measurement.

Electromagnetic flowmeters generally operate normally for a long time without maintenance after installation, and then require maintenance and daily inspection.

Electromagnetic flow meters offer several advantages, making them a popular choice in various industrial applications. Here are some of the key advantages of electromagnetic flow meters:

Electromagnetic flowmeter is a kind of induction instrument to measure the volume flow of conductive medium in tubes. It has been used in many fields. It is popular for its intuitive display and convenient operation. Here is to introduce the electromagnetic flowmeter according to the use.

The transducer in the split electromagnetic flowmeter can form a body or separate type with the sensor, the integrated electromagnetic flowmeter is the integrated electromagnetic flowmeter, the split type becomes the split electromagnetic flowmeter, the flowmeter is a two-way measurement system, and the three integrators are installed: the forward total, the reverse total and the difference total; Can be displayed. And has a variety of outputs: current, pulse, digital communication, HART, taking split electromagnetic flowmeter as an example to introduce what problems should be paid attention to when installing:

In the use of electromagnetic flowmeter measurement, we often have to consider how to deal with the problem of receiving no signal or signal is too weak, we should look for reasons from the following possible problems:

Measuring medium: Conductive liquid
Diameter range: DN3mm～DN3000mm
Accuracy: ± 0.5% of the indicated value, optional ± 0.3% or ± 0.2%
Measuring range (Flow rate): 0.01m/s～15m/s

Several factors can contribute to the inaccurate measurement of flow by electromagnetic flowmeters. These factors can vary depending on the specific application, installation conditions, and characteristics of the fluid being measured. Here are some common reasons for inaccurate flow measurement with electromagnetic flowmeters:

What are the external interference problems of the electromagnetic flowmeter for domestic wastewater

Calibration checks are another essential component of fault diagnosis for electromagnetic flow meters. Regular calibration against known standards ensures that the meter’s measurements remain accurate over time. Any deviation from the expected calibration values may indicate sensor degradation, electronic component failure, or other issues that require attention.

Electromagnetic flowmeters, also known as magmeters, are devices that measure the flow of electrically conductive fluids using the principles of electromagnetic induction. There are several types of electromagnetic flowmeters, each with its own characteristics and applications. Here are some common types:

Electromagnetic flowmeter as a commonly used flow measurement instrument, the choice of its material is also an important factor. Because in the electromagnetic flowmeter, the part in contact with the medium is only the electrode and the inside of the measuring tube, it is necessary to select the correct electrode and lining material according to the characteristics of different media.

The electrode is the main part of the electromagnetic flowmeter used to measure the liquid flow, therefore, the choice of normal electrode material is directly related to the accuracy of the measurement and the price of the electromagnetic flowmeter.

Measuring medium: Conductive liquid
Diameter range: DN3mm～DN3000mm
Accuracy: ± 0.5% of the indicated value, optional ± 0.3% or ± 0.2%
Measuring range (Flow rate): 0.01m/s～15m/s

Non-full tube electromagnetic flowmeter is an advanced flow measuring instrument, especially suitable for measuring the flow of non-full tube or partially filled fluid, such as municipal rainwater, wastewater, sewage and so on. The following is a detailed introduction to the non-full tube electromagnetic flowmeter:

Size: DN3-DN3000mm
Nominal Pressure: 0.6-1.6Mpa(2.5Mpa/4.0Mpa/6.4Mpa…Max 42Mpa)
Accuracy: +/-0.5%(Standard), 0.3% or 0.2% (Optional)
Liner: PTFE, Neoprene, Hard Rubber, EPDM, FEP, Polyurethane, PFA
Output Signal: 4-20mA/Pulse

For the daily inspection of the electromagnetic flow meter, in addition to the inspection of the sensor we talked about last time, it is also necessary to check the sensor of the electromagnetic flow meter, connecting cables, etc., below we will understand how to operate.

The installation direction of the electromagnetic flowmeter is not particularly strict requirements, generally horizontal, vertical or inclined can be unlimited. However, it must be reminded that in order to ensure that the pipeline is full of the measured medium, that is, the “full tube” state, it is recommended to install vertically, flow from bottom to bottom, especially for liquid-solid two-phase fluids, it must be installed vertically. If the site only allows horizontal installation, it must be ensured that the two electrodes are in the same horizontal plane, and the axis of the electrode must be approximately horizontal, because the electrode at the bottom is easily covered by sediment, and the top electricity is easily wiped by the occasional bubble in the liquid, covering the electrode surface and making the output signal fluctuate. The following lists the matters that need attention in the installation of electromagnetic flowmeters:

The reason why the measurement error is large is that the amount of oil and suspended matter in the water from the sewage station is high, and the treated sewage has a small amount of oil and suspended matter in the water, and the error of electromagnetic flowmeter measurement is also small.