Electromagnetic flowmeter static volumetric method flow calibration method

Electromagnetic flowmeter in the factory before delivery and use offline after a period of cycle test, both in the special flow calibration device with water flow calibration, to determine the flow indicator value and the accuracy of the instrument. Colonel electromagnetic flowmeter in flow standard device on time compared with the standard method can be divided into two categories, flow method and volume method. Total method is the instrument cumulative volume flow measured standard value of Vm and standard device volume v, to determine the value or the error. Although the calibration was conducted under the specified flow, due to the comparison, the total amount is so the requirements of the stability of flow rate can be lower. Traffic laws require at a predetermined under steady flow, the instrument at a predetermined value flow ( qv） M running after period of time t, collected in the standard device through the instrument of fluid volume v, standard flow is obtained, and then compare and ( qv） m。 This is one of the traditional real flow meter calibration method, qv have higher requirement in t time flow stability. Flow meter calibration method by total method, reduces the flow stability requirements, simplifies the flow standard device to maintain the stability of the flow facilities, especially in the large device greatly reduces the overhead tank overflow the required energy consumption. This method has been widely adopted for instrument manufacturer. But the traditional test methods in the research and measurement organizations is still in the important position, is used to research and development or evaluation flow meter performance. Real flow electromagnetic flowmeter calibration commonly used methods are: ( 1) Volume - time method; （ 2) Quality - time method; （ 3) Standard flowmeter comparison method. Before both the flow standard device according to the original standard device, the latter said transfer standard device. Electromagnetic flowmeter in the factory before delivery and use offline after a period of cycle test, both in the special flow calibration device with water flow calibration, to determine the flow indicator value and the accuracy of the instrument. Colonel electromagnetic flowmeter in flow standard device on time compared with the standard method can be divided into two categories, flow method and volume method. Total method is the instrument cumulative volume flow measured standard value of Vm and standard device volume v, to determine the value or the error. Although the calibration was conducted under the specified flow, due to the comparison, the total amount is so the requirements of the stability of flow rate can be lower. Traffic laws require at a predetermined under steady flow, the instrument at a predetermined value flow ( qv） M running after period of time t, collected in the standard device through the instrument of fluid volume v, standard flow is obtained, and then compare and ( qv） m。 This is one of the traditional real flow meter calibration method, qv have higher requirement in t time flow stability. Flow meter calibration method by total method, reduces the flow stability requirements, simplifies the flow standard device to maintain the stability of the flow facilities, especially in the large device greatly reduces the overhead tank overflow the required energy consumption. This method has been widely adopted for instrument manufacturer. But the traditional test methods in the research and measurement organizations is still in the important position, is used to research and development or evaluation flow meter performance. Real flow electromagnetic flowmeter calibration commonly used methods are: ( 1) Volume - time method; （ 2) Quality - time method; （ 3) Standard flowmeter comparison method. Before both the flow standard device according to the original standard device, the latter said transfer standard device. Electromagnetic flowmeter in the context of the current market conditions, is the trend of the flow meter in the mainstream. Electromagnetic flow meter because of the simplicity of its design, precision is guaranteed over the years has been favored by the scene. Company produces the electromagnetic flowmeter with rectangular wave excitation, the electrode is normally 316 electrode, there are other electrodes, depending on the parameters selection. Let's to talk to the people focus on advantages and disadvantages of electromagnetic flowmeter. Electromagnetic flowmeter major advantages: 1. Sensors do not contact with the measured medium, so can be used for measurement of corrosive medium. 2. Has a linear relationship between output current and flow rate, and is not affected by the physical properties of the fluid ( Temperature, pressure and viscosity) Change and the influence of flow velocity range is wide. This is also one of the main reasons for the wide range of electromagnetic flowmeter flow, because it's not like a differential pressure type flowmeter, flow rate and the output is open relationship, flow range will be limited. 3. Quick, can be used for the pulsating flow measurement, the characteristics of electromagnetic flowmeter such main is due to the structure itself. 4. Measuring pipe inside have no moving parts or outstanding in tube parts, and the pressure loss is very small, almost zero. This we should be very easy to understand, electromagnetic flowmeter, unlike the throttle device can produce differential pressure because of throttling phenomena, so the pipe will create pressure loss at the scene. 5. Large diameter range, electromagnetic flowmeter can be made more than 1 mm to 2000 mm pipe specification.

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