In the chemical and oil refining industry production, flow and liquid level are two is crucial data for production control, liquid level meter
is also used in the production site for common types of instrument.
In numerous measuring liquid level of industrial instrumentation, inspcetion level gauge
for measuring range, low cost, the instructions clear, a lot of advantages such as high pressure grade and good safety is widely used in oil refining chemical plant.
Because the inspcetion is using the principle of magnetic coupling to work, realize the level measurement, so there are often such a situation, is the inspcetion level of performance is not stable, because the magnet steel use after a period of time, magnetic, magnetic float in the pot and indicator lose magnetic connection between the small magnetic steel, magnetic followed, cause the panel indicator cannot be the flap on the indicator will not be able to effectively turn over and lose instructions, due to the indicator of the number of small magnets magnetic weakening degree and produce magnetic phenomenon (
Also called flowers screen)
Early inspcetion level gauge, which is the main reason of magnetic.
Before this kind of situation in common, that is because of the supplies of raw materials of magnetic steel product quality closes nevertheless, common quality is poorer.
But as the technology progress in recent years, as well as market competition intensifies, the poor quality of many companies to be eliminated or increased investment in technology, emphasis on product quality, the magnetic steel products on the market at present has obtained the very big change, the quality of the magnetism of magnetic steel to strengthen, magnetic to improve stability, directly because of magnetic steel and appear & other;
Disorderly magnetic & throughout;
Is a rare phenomenon, this article is about the other one is not easy to detect.
In the use of conventional inspcetion level gauge measuring the level of liquefied hydrocarbon easy vaporization medium, stable state, the mutual transformation between gas phase and liquid phase of the measured medium equilibrium.
At this time, if by the extraction liquid inside the tank, the liquid on the surface of the space increases, the gas phase pressure is reduced, there will be a part of liquid of heating)
There will be a large number of air bubbles, small bubbles in the process of rising together into a big bubble, bubble into the conventional inspcetion level gauge measuring chamber, it may cause a rise in gas phase and gas phase section, when encountered in the process of rising float around the float through the air want, at the same time float movement too fast and lose the magnetic connection and measurement of outdoor indicator function, causes & other
Disorderly magnetic & throughout;
Also, in the normal production of airtight pipeline, due to various reasons sometimes mixed with many sizes of bubbles in some form of liquid, serious when even also can produce & other;
Gas to segment & throughout;
The appearance of the liquid in the mixed gas to be as the change of production, if a equipped with conventional inspcetion level gauge the feed pipe of the equipment and the level of the relative position of bubbles into the liquid level meter, when mixed with the gas phase liquid into the device, the gas phase, would be the inspcetion level gauge measuring room, if some scattered small bubbles from entering, because the inspcetion level gauge measurement indoor medium density changes, float of buoyancy will change, will change the position of the float, the liquid level indicated by the inspcetion the level indicator values will produce the error of the big or small, that is to say, this kind of situation interferes with the normal inspcetion level gauge instructions, if it is a lot of air bubbles or a & other;
The gas phase period & throughout;
Entered the inspcetion level gauge measuring indoor, also can produce as previously ignored when liquefied hydrocarbon described & other;
Disorderly magnetic & throughout;
These lead to the conventional inspcetion level meter cannot work due to the phenomena of liquid level measurement of liquid phase medium mixed gas caused by the impact of relative level gauge, to make inspcetion liquidometer work, must be modified to it, let it can adapt to the impact.
Supplementary analysis: inspcetion level gauge is a buoyancy liquid level meter, its measurement is lower liquid medium and the upper interface of the gas phase.
Changes when the pressure in the container medium phase change occurs, the interface fluctuation happens, such as pressure medium to produce a large number of bubbles, lift the gas-liquid interface, this kind of phenomenon in the by-pass pipe and container internal performance level is different, so in a way possible.
Up from fundamental's buoyancy liquid level gauge on the phase transition of false level do not have to overcome.
Because it is only the gas-liquid interface, don't ask how many things in the tin.
Heavy barrel type level gauge, differential pressure type level gauge tell from the fundamental principle is to measure the weight of containers within the medium, through the operation pressure to come up with a jar of liquid level data.
But after two) has its drawbacks as well as liquid level, that is, although the instrument shows seemingly level of discontent, actually has the problem of overflow tank.
So in the production of the specific choice of level gauge factors should be considered, even there are many enterprises in order to ensure that the correct level, adopted at the same time using two kinds of liquid level gauge to monitor the change of liquid level, to ensure the safety and stability of the production run.
In this paper by embellish instrument technology co. , LTD. Arrange release.
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