Orifice meter scale errors and solutions

Abstract: the orifice meter scale errors and the solution information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Orifice flowmeter in: the cause of errors in measurement of standard orifice plate is measured flow differential pressure generator, cooperate with all sorts of differential pressure gauge or differential pressure transmitter to measure all kinds of fluid flow in pipes. Orifice flowmeter throttle device including the ring chamber orifice, nozzle, etc. 。 More flow meter manufacturers choose model price quote you are welcome to inquire, below is the orifice meter scale errors and solutions the article details. Orifice flowmeter in: the cause of errors in measurement of standard orifice plate is measured flow differential pressure generator, cooperate with all sorts of differential pressure gauge or differential pressure transmitter to measure all kinds of fluid flow in pipes. Orifice flowmeter throttle device including the ring chamber orifice, nozzle, etc. Orifice flowmeter throttle device with differential pressure transmitter, can measure the rate of flow of liquid, steam, gas, orifice flow meter is widely used in petroleum, chemical, metallurgical, power, light industry and other departments. For wide scope of application of orifice meter, the quantity, so often have customer response, orifice flowmeter in use after a period of time, often appeared in the actual flow is not consistent, that according to this problem, we have also made a phone a large amount of data, sums up the main errors have several reasons. 1, due to the orifice plate used for a long time, especially in the mixed solid particles and other debris measured medium case, or by chemical etching, will result in changes of the orifice geometry shape and size, if the entry of the orifice plate on the edge of the sharp impact due to medium or corrosion and dull, so in equal to the number of generated when the fluid passes through the differential & Delta; P is reduced, thus cause the display value is low. Serious when need to replace the orifice plate. 2, perhaps because time is long, the zero drift will happen in the transmitter, if negative drift, transmitter output current is less than the standard 4 ma, flow is displayed on the low side, if is drifting, transmitter output current is greater than the standard 4 ma, flow is displayed on the high side. If the range setting is bigger, flow is displayed on the low side, range set smaller, flow is displayed on the high side. 3, gas flow meter display is too small, the check for orifice plate upside, the actual is the sharp side of the orifice plate should meet the direction of flow as the entry point, the shape horn mouth on one side of the end for export, pay attention to the direction. Besides, the installation when opening center hole is different from the center line of the pipeline, can also cause measurement error, protruding objects such as pressure pipe blockage and gasket, is also a cause of this error. Read: Ming yu flowmeter 4, in the practical use of automatic control and orifice plate surface may touch 'on a layer of dirt, or due to the corner, a long time before and after the orifice deposited impurities, or because of strong corrosion effect can make the pipe cross-section of the flow of the gradient, and the leak of pressure pipe line and congestion, can cause measurement error. Due to some manufacturers use gas is dirty, Containing tar) , before and after the orifice pressure ring room blocked, no pressure differential pressure, flow meter no flow, according to the clear after removed the two ring chamber and replace the guide tube, flow meter display is normal. Below to introduce the main measures to solve the orifice meter measuring precision: 1, the orifice meter are calibrated by Taiwan. As you all know, the standard orifice plate as long as the design and manufacture with reference to relevant standards, don't need real flow calibration can be used directly. Because of outflow coefficient can be directly calculated by the software, but after all, the ideal of the computer, and the scene environment still have certain difference, so, in order to guarantee the accuracy of measurement, suggestion to real flow per meter calibration, the calibration of the outflow coefficient and compare the calculated results, calculate on business value, modification. 2, Reynolds number correction, the orifice meter has a certain relationship between discharge coefficient and Reynolds number, when the mass flow rate change is directly proportional to the Reynolds number changes, thus cause the change of the flow coefficient. 3, the influence of temperature on the orifice meter and its correction, fluid density changes with the temperature change, leading to the relationship between the differential pressure and flow change, secondly, pipeline diameter caused by the temperature variation, the change of the orifice opening, correction of temperature change, is to take temperature instrument measuring temperature field and then enter into the secondary instrument to adjust temperature change caused by the error. 4, expansiveness correction. Orifice meter measuring steam, gas flow, must carry out the expansiveness of correction fluid, specific design manual correction factor can consult the throttle device. 5, the calculation of steam mass flow rate, orifice meter measuring, steam flow value, first by the differential pressure signal obtained by steam temperature, the pressure value look-up table density, to calculate the quality of the steam flow. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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