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Electromagnetic flow meter scale electrode maintenance and cleaning method

Abstract: the electromagnetic flow meter scale electrode maintenance and cleaning method of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. When measuring the medium such as wastewater, slurries, prone to the pipe wall and electrode surface fouling and attachments. When scaling material conductivity and electrical conductivity of the measured medium is not at the same time, there would be a measurement error. Sludge, oil pollution of electrode, will be, too. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a scale electrode electromagnetic flowmeter maintenance and cleaning method of the article details. When measuring the medium such as wastewater, slurries, prone to the pipe wall and electrode surface fouling and attachments. When scaling material conductivity and electrical conductivity of the measured medium is not at the same time, there would be a measurement error. Sludge, oil pollution of electrode, also can make the instrument output swing and drift. Therefore, in some cases need to maintain the electrode. For example, cleaning electrode and replace the electrodes. Clean the commonly used method has the following kinds: (electrode l) Electrochemical methods of metal electrodes in electrochemical phenomena exist in the electrolyte fluid. According to the principle of electrochemistry, electrode electric field and fluid interface, electrode and fluid interface electric field are electrode/fluid phase to ask the electric double layer. For electrodes and fluid interface electric field of the study found that the substance molecules, atoms, or ions adsorption phenomena in the interface has a rich or poor, and found that most of the inorganic anion surface active substances, as the typical ion adsorption rule, and inorganic cationic surface active is small, therefore the electrochemical cleaning electrode anion adsorption is only considered. Anion adsorption and there is a close relationship between electrode potential and adsorption mainly in charge potential correction of potential range than zero, namely the cable surface with opposite sign charge. On the electrode surface with no charge, when the remaining charge density slightly larger, electrostatic repulsion is greater than the adsorption force, anionic quickly stripping, this is the principle of electrochemical cleaning. Some companies by adding two positive pressure drop of diode in the signal back to the road, and then in the form of common mode of negative 1. 2. 1. 4 v voltage is added to the two electrodes. Because the electrode voltage is negative for dc common-mode voltage, saturation will not result in amplifier. Common-mode voltage dc superimposed on the small flow of alternating signal, by capacitance will dc isolation, and the preamplifier will inhibit common-mode voltage, dc common-mode voltage does not affect the flow measurement. Add on the electrode of dc load voltage, can form a negative electric field repulsion attached on the electrode material, to clean the electrode day. This method can effectively and automatically in the ac excitation, continuously on the electrode. But for the low-frequency rectangular wave excitation, due to the high polarization voltage amplitude, effect not very good, so rarely seen lately. ( 2) Machinery QingChuFa QingChuFa by installing special mechanical structure on the electrode to achieve clear electrode. There are two forms: one is to use mechanical abrasion. With stainless steel qi, a gua with thin shaft knife through a hollow electrode gua dao derivation, fine between shaft and the hollow electrode adopts mechanical seal to prevent medium, except for the scraper and purple the machinery. When rotating thin axis from the outside, gua knife close to the tip plane turning, shave their dirt. This in addition to the scraper can be manually, also can use the automatic shave their fine motor drive shaft. Another is in a tubular electrode, mount away dirt with the steel wire brush, shaft wrapped in sealed & other; O” Form circles, in order to prevent fluid leakage. The cleaning device often need someone to pull the steel wire to clean the electrode. ( 3) Ultrasonic cleaning method of the ultrasonic generator to produce 45 ~ 65 KHZ ultrasonic wave voltage to the electrodes, the ultrasonic energy collection, almost focused on the attachments, the applied voltage of high voltage attachments to breakdown, will then be fluid washed away. Starting from the security, use electric shocks tees must be flowmeter in * interrupt measurement, signal lines disconnect between sensor and converter and converter, power failure cases will communicate ( 50 hz or 60 hz) High voltage directly on the sensor signal output terminal for cleaning. ( 5) Improve the average flow velocity of the measuring tube and use pointed a small area of the electrode in the measurement is easy to scale, adhesion of the medium, usually can choose than pipe diameter smaller sensor technology, improve the velocity of flow. Experience has shown that tube average flow velocity is higher than 2 m/s, average precipitation adhesion is less likely. Also have to take moment increasing velocity of 3 & ndash; 5m/s( See attached situation) Scour adhesion layer. Electrode head highlight the tip shape, the fluid scour strength ( Because the wall velocity equals to zero, pointed out into the wall boundary layer flow layer) And so less likely to pollution. In addition, due to the small area of the electrode itself the signal source resistance is big, the electrodes attached to pollution caused by signal after the change of the internal resistance effect is small, so the impact on the instrument measuring is also small. Hope the above analysis to be of help. Because only the right to use it to play its role. About these information and we will serve you in time. The use of the products and ensure that you properly. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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