Plug-in comparison method of vortex flowmeter are discussed

Plug-in vortex flow meter because of its low price, light weight, small pressure loss, easy to install and maintenance, etc, has outstanding advantages in big measurement of surface runoff, at present our company on the large diameter water flow measurement of vortex flowmeters are widely used plug-in. With the practice of energy saving measures of the company in recent years, the use of units of measurement data of the water on the accuracy requirement also more and more high, inside the company about the large flow of water is put in bigger dispute the accuracy of the measurement data has been, as soon as possible so you must find a simple and effective method to plug-in vortex flowmeter measurement data comparison, to correctly evaluate the accuracy of the instrument measurement data. 1. Introduction to plug-in plug-in vortex street flowmeter belongs to the point vortex flowmeter type current meter insertion type flowmeter, it is composed of measuring head, insert screw, insert structure, converters, and instrument housing ( Measuring pipe) Composition. When the measuring head to a specific location in the pipe ( General average flow velocity in pipe axis or pipelines) , measure the medium at the local flow velocity, and then according to the medium velocity distribution inside the pipeline and geometric parameters of instrument and pipeline calculated pipeline flow values within the plug-in vortex street flowmeter type measuring head for pulse frequency. The flow calculation formula is: qv = f/K ( 1) Type: qv for volume flow, m3 / s. F is the frequency of the flowmeter, Hz; K for the instrument coefficient of flow meter, 1 / m3. 2. Insert point type current meter into the vortex flowmeter flowmeter calibration method has two kinds: meter and meter method. Flow meter method is about the whole flow meter calibration, the calibration device and method is the same as full tube flowmeter, but due to some current meter inserted type flowmeter used in the measurement of big amount of runoff, so the corresponding equipment and calibration are expensive, cannot be generally used, only in certain situations, Such as technical supervision department] The arbitration of flowmeter measurement results, type test of flow meter, etc. ) Use. Flowmeter measurement head meter method as a is a flow meter to calibration. Measured the instrument of measuring head coefficient K0 first, and then according to the use of fluid and the pipe condition on site and determine the correction factor, then according to the pipe cross section area is calculated instrument of the flowmeter coefficient K. The standard calibration device used for flow meter method, are used for the liquid medium straight groove, gas with low speed wind tunnel. General flow meter manufacturers do not have the above two kinds of standard device, the more the workaround with circular tube flow standard device to calibrate the measuring head to determine the instrument coefficient of measuring head KO, but must be determined at the same time some of the unit test phase correction coefficient. Point type current meter inserted into the meter instrument coefficient K is usually by calibration instrument of measuring head coefficient calculated as amended KO. Instrument correction formula to calculate the coefficient K is: K = K0 / ( aβ A) ( 2) Type: the instrument coefficient of K0 for measuring head, 1 / m3; A is the velocity distribution coefficient; β For the block coefficient; To measure A pipeline cross sectional area, the m2. 3. Plug-in vortex street flowmeter measurement data comparison method for a long time, my company use plug-in vortex street flowmeter since putting-in-service proactively, has been using the instrument factory data, through the instrument used several cycles, due to the changes of technology and the environment, medium corrosion and wear, and instruments of measuring head electronic converter performance degradation and other reasons are likely to affect the accuracy of measurement instrument. Because the company does not have test plug-in vortex street flowmeter standard device, the instrument measuring data error is bigger, often use the following some methods of measurement for simple comparison. 3. 1 with the pump flow rate than before, when using the unit operator to insert suspicious of vortex street flowmeter measurement data, often to pump nameplate & other; ' Regulation performance points throughout the &; The rated flow or to typical pressure pump Flow characteristic curve of the corresponding flow readings to compare, if the two flow value is inconsistent, inaccurate, immediately notify maintenance personnel for inspection, but after checking instrument maintenance personnel and found no abnormalities, so the two sides were at sixes and sevens and generate controversy. Actually to pump flow ratio on instrument flow value is often misunderstood, because the conveying flow pump is by the characteristic curve of pump and piping system load characteristic curve of intersection identified, it changes with operating load characteristic, water pump nameplate indicating the rated flow refers to the flow rate under the condition of a certain regulation, and in most cases the actual flow and the rated flow, and in most cases the actual flow rate is not consistent with the rated flow.

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