This paper introduces a simple and practical magnetic flap liquid level gauge field calibration method

by:Kaidi Sensors     2020-10-27
Magnetic level gauge is now turning in a variety of tank in the use of industrial sites is becoming more and more big, because it does not need to use other means can intuitively reflect the level of actual status inside the container, the advantages of the simple and intuitive recognised by the majority of products. And if use the need of remote transmission signal, also can let companies gaiden device through the output 4-5 20 ma power signal. Production site cuhk range magnetic flap in 2 meters above the level of measurement accuracy are neck and neck with differential pressure transmitter, at this point, the magnetic flap still considerable advantages over liquid level gauge measuring tank liquid level. But due to the restriction of the actual conditions, each manufacturer propaganda by the merits of free maintenance and can't get real reflected, so the detection demand also will increase. Magnetic double the level structure of the principle of simple explanation: magnetic flap liquid level meter was developed according to the principle of buoyancy and magnetic coupling. When the measured liquid level fluctuation of the container, tube of the magnetic float level gauge ontology is lifting, float in the permanent magnets by magnetic coupling to a magnetic column indicator, driven column turn red, white, so as to realize level clear instructions. Through the opening of the built-in dry reed pipe contacts, current or voltage signal transmission. Magnetic flap liquid level meter in the factory (usually by simulation method This method didn't explain) in this discipline To carry on the adjustment, to ensure that supply match with the actual medium. Instrument field verification of the need to pay attention to several problems: according to the verification standard stipulated by the state, in small 2 meters length gauge calibration shall be carried out by a standard water tank, the length of the greater than 2 m may need to be done using simulation method. But actual situation often limits the not according to the standard test procedures, such as in the laboratory instrument size is too long, can't install, the simulation verification method prescribed by the state and the lack of detail, in this case, how to realize the level gauge calibration online? Summary, there are the following points need to be pay attention to: 1, the tank as a black box, how to determine the level calibration reference point is one of the key problems; 2, the level of medium density measurement range are wide, general is 0. 8 to 1. 2 g/cm3, how the effect of density on the level measurement error correction; 3, the installation of storage tank can't be * * vertical, so how to choose the measurement standard, how to measure, will appear very important. In this paper a charged remote transmission signal, 4~20mA) Side mounted magnetic flap liquid level meter as an example to explore a simple and effective calibration method, in order to reach under the condition of the installation error of the measurement of the liquid level of the whole system and its uncertainty, the purpose of practical significance. Field calibration steps: first, determine the medium density medium density can be measured with standard density meter, can also according to the user to provide specific data collect, medium density should be recorded for the record, to ensure that the medium density can accord with the requirement of level gauge instructions. Although theoretically medium density values have impact on the level gauge, but the actual use of the level of zero and full value can directly adjust potentiometer. Second, determine the reference zero connection pipe diameter D is measured with vernier caliper, under the upper tank to determine a standard level of foot points, such as conditional, better able to grind the grooved lest depth gauge swing, and mark; Without pressure condition on the interior of the tank to the storage tank water injection in manual way, when the water level slightly higher than the level gauge feed line stop pouring, E manual ball valve to open the connection flange and loosen the tanks and the school level gauge between the connecting flange of F ( Don't get off, but blunt water) Until there is no flowing in the pipeline flow, close E, remove the flange, stay inside the tank liquid smooth open E, again for the drip status, stable 1 min ( Through the drain valve drainage when necessary, and improve the detection efficiency) ; From point to the surface by sounding steel tape measure the distance between the ha, real zero empty h0 = ha - higher D / 2, this state level gauge measuring zero point three, namely the level of calibration on the flange, closed E, continues the tank with water, to flap indicator needs calibration scale level of the main place, after waiting for the water stability measurement of output current and water level Ii, empty high hi actual level for: H0 = H0 - hi=ha- D / 2 - 你好; Continue until the full range of other point. Four, liquid level adjustment of zero and full in determining the reference zero point at the same time, adjust the zero potentiometer, makes the output signal is shown as 4 ma; Full adjustment in the upper limit of standard level, increase full range potentiometer, makes the output electric signal display to 20 ma. Under schedule measurement output if there is a deviation, with reference to this method to adjust. Field calibration need repeat the above steps 3 return measurement. This article conclusion: through the above process as you can see, actually the side mounted magnetic flap liquid level gauge field calibration instrument is simple and practical, the maneuverability is strong, solved the instrument laboratory cannot be detected in a wide range of difficult problems, has the very good practical value. In addition, as the measurement has many characteristics, such as corrosive medium and can't direct contact with the case, if the inclination of tiny, measuring point surface level of tank, also can be replaced with a laser range finder depth steel tape, nonetheless, field testing also has certain limitation, to take the level of pressure vessel with volatile medium school rules can not use this method. In this paper by embellish instrument technology co. , LTD. Arrange release.
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