Describe the working principle of electromagnetic flowmeter

How much is the electromagnetic flowmeter?

Although a, like other flowmeter, electromagnetic flowmeter is its measuring range than spake, than the vortex street flowmeter and the differential pressure type flowmeter are higher, but it is also limited, many customers set the table, often compare it and the water meter, thought that can measure very low velocity of flow, in general, it can only be measured 0.1 m/s. Below are difficult to correct the velocity of electromagnetic flowmeter measurement.So the initial order to the flow range than to make clear.You can't order according to the original pipe diameter, according to your actual flow to determine the meter diameter.

Two, with other flowmeter is same, electromagnetic flowmeter also has a requirement to install before and after straight pipeline, just than other kind flowmeter requirement is lower, but the most key point should satisfy: it is full pipe, full pipe again.Under the condition of not enough pipe, it is easy to cause the flowmeter to jump randomly:

Third, like other flowmeters, electromagnetic flowmeters also have protection grade, the general protection grade of the integrated type is IP65, the split type is IP68(for sensors), if the customer has requirements on the installation environment of the instrument, the installation location is in underground underground underground shaft or some other damp places, it is recommended that the customer choose the split type.To avoid the wrong selection of instrument damage.

Four, electromagnetic flowmeter can measure corrosive liquid, but at the beginning of the order, the customer should correctly provide other measurement medium properties, so as to avoid the error of electrode selection in the selection process, resulting in the sensor scrapped in the later use process, to the customer inconvenience and economic losses.

Five, although the electromagnetic flowmeter reliability is better, generally will not be damaged, but because of its principle, the surface of the sensor electrode has been in contact with the liquid, a long time, the surface of the electrode is more prone to pollution.So electromagnetic flowmeter in general, the customer has conditions to remove the case, it is recommended to remove between a year and a year and a half between cleaning electrodes to ensure the meter machine measurement accuracy.Any instrument is needed "maintenance", electromagnetic flowmeter is no exception.

Sixth, when the main line is a vertical pipeline, generally, the water flow is required to be from the bottom up, not from the top down as far as possible.The latter is easy to cause the flow fluctuation is larger.In addition to full pipe, this is also important, followed by the distance between straight pipe and front pipe.

Choose a place that is easy to maintain and move.The flowmeter should be installed at the back end of the water pump, never on the suction side.Valves should be installed downstream.

The working principle of

Electromagnetic flowmeter is based on Faraday electromagnetic induction law flow meter measurement.The advantage of electromagnetic flowmeter is that the pressure loss is very small and the flow rate can be measured in a large range.The ratio of the maximum flow rate and the minimum flow rate is generally above 20:1, the applicable industrial pipe diameter range is wide, up to 3m, the output signal and the measured flow rate into a linear, high accuracy, the electrical conductivity ≥5 microns /cm acid, alkali, salt solution, water, sewage, corrosive liquid and mud, pulp, pulp and other fluid flow rate.But it can't measure the flow of gases, steam, or purified water.

When the conductor moves the cutting magnetic force line in the magnetic field, the induced potential will be generated in the conductor. The magnitude of the induced potential is directly proportional to the effective length of the conductor in the magnetic field and the conductor's speed of moving perpendicular to the magnetic field direction in the magnetic field.Similarly, when a conductive fluid flows vertically in a magnetic field and cuts lines of induction, it generates an induced potential on the electrodes on either side of the pipe.