If the attachment is higher than the liquid conductivity of conductive material, measurement easily when the fluid wall adhesion and sediment quality.
Signal voltage will be a short circuit and unable to work, if is a conductive layer * first electrode should be paid attention to pollution, such as choose not easy adhesion, pointed or domed electrode, replaceable type electrode, scraper type cleaning scales electrodes, etc.
Scraper type electrode outside sensor scrape manual scaling back on a regular basis.
Domestic products have electrodes with ultrasonic transducer, to remove surface dirt, but is now rare.
Also have temporarily disconnect measurement circuit, through the low voltage high current, electrode gap time burn clean the oil type of adhesive layer adhesion.
Easy generation of places can improve the flow rate to achieve the purpose of the cleaning can also take it's convenient to the pipeline connection, easy to clean is not clean sensor assembly.
In this paper about descaling of three common ways of electromagnetic flowmeter
Machinery QingChuFa QingChuFa is through the electromagnetic flowmeter electrode are installed on the special mechanical structure to realize they cleared.
There are two forms: one is to use mechanical abrasion.
Made from stainless steel with a thin shaft scraper, through a hollow electrode spatula derivation, fine between shaft and the hollow electrode adopts mechanical seal in order to prevent the outflow of medium, then form the mechanical except the scraper.
When rotating thin axis from the outside, scraper to 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.
Domestic electromagnetic flowmeter scraper type electromagnetic flowmeter has this kind of performance, and stable performance, easy to operate.
Another is in a tubular electrode, mount away dirt with the steel wire brush, shaft wrapped in sealed & other;
Form circles, in order to prevent the fluid leaks.
The cleaning device often need someone to pull wire brush to clean the electrode, is not very convenient to operate, not xi 'an YunYi scraper type electromagnetic flowmeter is convenient.
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 with fluid interface is electrode/fluid and is caused by 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, the electrode 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.
Ultrasonic cleaning method ultrasonic generator to produce 45 ~ 65 KHZ ultrasonic wave voltage to the electrode, the ultrasonic energy concentrated on the electrodes in contact with the medium, thus the ability of using ultrasound to shatter bilge, achieve the purpose of cleaning.
Electric shock tees this method USES ac high voltage to the electrodes and the medium between regularly, usually add 30 ~ 100 v.
Because the electrodes are attached, the surface contact resistance, almost focused on attachments the applied voltage, high voltage attachments to breakdown, will then be flow away.
Total safety, use electric shocks tees must be interruption of flowmeter measurement, signal lines disconnect between sensor and converter, power outage case ac high voltage directly on the sensor signal output terminal for cleaning.
Above, this paper introduces several kinds of electromagnetic flowmeter electrode maintenance and cleaning method, in fact, if we are in the early stage of the selection can be measured after fully considering the medium can produce pollution to the electrode, then you should choose scraper type electromagnetic flow meter, can be very convenient to maintenance and cleaning of electrodes, save a lot of trouble.
Scraper type electromagnetic flowmeter, is by the display instrument, shell, the coil, the coil, electrodes and other components of the components, including electrode component is removable scraper type electrode structure, this structure is the signal electrode wear on the scraper blade scraper bar, through the gland nut will signal the electrodes and the scraper bar fixed on the electrode cup, cup welding electrodes, solid on the table, in the signal electrode and the table body, the electrode cup, separated by insulating material between the gland nut.
When the signal electrode need maintenance and maintenance, need to open the cap, turn the handle with the hand, scraper bar rotates, make close to the signal electrode scraper scrape off the signal electrode on the surface of the dirt, clean up after the scraper in the direction of the spin to and the direction of fluid flow (
Is there direction mark on the knob)
, the operation is very convenient.
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