Digital Water Liquid Pulse 4-20mA RS485 Electromagnetic Flow Meter

There are two ways to produce bubble-like gas in liquid, which are inhaled gas from the outside or dissolved gas in the medium is transformed into a free bubble.

The correct selection of electromagnetic flowmeter is the prerequisite to ensure the good use of electromagnetic flowmeter. What kind of electromagnetic flowmeter should be selected should be determined according to the physical and chemical properties of the measured body medium, so that the diameter of the electromagnetic flowmeter, flow range, lining material, electrode material and output current, etc., can adapt to the nature and flow requirements of the measured body.

The correct selection of electromagnetic flowmeter is the prerequisite to ensure that the electromagnetic flowmeter can be used well. The choice of electromagnetic flowmeter needs to be determined according to the physical and chemical properties of the tested conductive liquid medium.

The measuring principle of intelligent electromagnetic flowmeter is Faraday’s law of electromagnetic induction, which measures the flow of conductive fluid according to the electromotive force induced by the conductive fluid through the external magnetic field. The main components of the sensor are: measuring tube, electrode, excitation coil, iron core and yoke shell.

In the electromagnetic flowmeter installation and debugging stage there will be some failures, below, we will understand the specific causes of the failure at this stage and their elimination methods.

As a measuring device with simple structure, sensitive response and not affected by physical properties such as temperature and viscosity of the measured medium, electromagnetic flowmeter has been widely used in the water supply industry, and has obtained good results.

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.

Installing electromagnetic flowmeters correctly is essential for ensuring accurate and reliable flow measurement. Here are some precautions to consider when installing electromagnetic flowmeters:

In order to prevent water resources from being polluted, improve living conditions and protect scarce water resources, most cities have established drinking water projects and sewage treatment plants. In the process of sewage treatment and discharge, the measurement of sewage flowmeter is an important problem. In the process of sewage metering, the selection of sewage flowmeter is very important.

The installation of the electromagnetic flowmeter depends on the requirements of the customer’s working conditions, and then select the type, and install it according to the instructions or the guidance of the flowmeter manufacturer’s staff. The following points need to be noted when installing the electromagnetic flowmeter:

The insert type electromagnetic flowmeter is an instrument used to measure conductive liquids, especially for large diameter pipe measurements.

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.

For the pipeline supporting the electromagnetic flowmeter, the factors affecting the accuracy of the plug-in electromagnetic flowmeter are mainly the length of the straight pipe section and the inner diameter of the pipeline:

According to the principle formula of the electromagnetic flowmeter, the induced signal potential is not affected by the change of conductivity and temperature, pressure, density and viscosity when the liquid conductivity is uniform. However, in the actual measurement, due to the following reasons, the electrical conductivity will also have some impact on the measurement.

Electromagnetic flowmeters, also known as magmeters or magnetic flowmeters, typically generate electrical output signals proportional to the flow rate of a conductive fluid passing through a pipe. The most common output signals from electromagnetic flowmeters include:

1, the role of the electromagnetic flowmeter grounding ring: the grounding ring is directly in contact with the medium through the grounding electrode, and then the grounding ring is grounded with the flange of the electromagnetic flowmeter to achieve equal potential with the ground to eliminate interference.

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

Electromagnetic flowmeter is a widely used flow meter, in the process of use will inevitably appear some failures, then how to check the cause of the failure and eliminate it, the next Aister to teach you several simple troubleshooting methods.

Electromagnetic flowmeter mainly has two kinds of pipe segment type and plug-in type, and is divided into two types of body type and sub-body type, of which the plug-in electromagnetic flowmeter is suitable for DN300 or more pipelines.

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

Usually there is more or less a mixture in the fluid in the measurement of some occasions. In general, in the presence of a small bubbling flow of oil and gas bubbles, it is still able to work normally, but the measurement is a fusion of the volume of oil bubbles, if the proportion of oil and gas rises to have caused a projectile flow, then the electrode may be covered by gas, resulting in the circuit is disconnected, the output shake is more likely to be directly damaged.

The choice of water flow meter is a comprehensive consideration process, involving many aspects of factors. Here is a guide to tap water flow meter selection to help you choose the most suitable solution:

Electromagnetic flow meter is one of the most popular flow meters. Flange type electromagnetic flow meter has been used for more than 50 years worldwide. It is widely used for all conductive liquids in every industry, such as water, acid, alkali, milk, slurry etc.

The installation distance between an electromagnetic flowmeter and a control valve, especially a rear valve, is a critical factor that can impact the accuracy and reliability of flow measurements. Here are some general guidelines to help determine the appropriate installation distance:

Drainage flowmeter, sewage outfall flowmeter installation position

Electromagnetic flowmeter in use, we need to pay attention to what? Today for you to do a simple description, I hope you pay attention to the following points about the maintenance of electromagnetic flowmeters:

Battery-powered electromagnetic flowmeter is a metering instrument designed for water supply enterprises, which can optimize water use and ensure accurate water measurement.

The shell protection level of the ordinary electromagnetic flowmeter sensor is IP65 (the dustproof and anti-splash level stipulated by GB4208), and the requirements for the installation site are:

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

Electromagnetic flow meters, like any complex instrumentation, require effective fault diagnosis methods to ensure their optimal performance and reliability. One common approach to diagnosing issues with electromagnetic flow meters involves the analysis of the sensor signals. Any deviation from the expected output can be indicative of potential problems within the system. Advanced diagnostic algorithms can be employed to detect abnormalities in the induced voltage or electromagnetic field, allowing for the identification of faults such as sensor drift, signal noise, or electrode fouling.