Most of the identification tests of an electromagnetic flowmeter are carried out with the flow of liquid through a flowmeter and a calibration gauge or reference flowmeter. Should pay attention to ensure that the liquid in the test pipe evenly stable activities, not because of the disturbance caused by part of the rapid shaking of the impact of speed. This perturbation often occurs within the Reynolds number range unique to industrial process activity conditions. There are several electromagnetic flowmeter performance appraisal methods:
1. There is a need to maintain the closest link between the identification collective and the manufacturer. In the decision-making process of the experiment should pay attention to the production plant on the appearance of the skills that, and seek to make the production of experimental procedures and experimental results.
2. Reference flowmeter or calibration specifications The equipment should be of suitable size and can contain the flow scale of the flow meter under test. If the flowmeter needs to be installed in a test fixture, then these requirements should be clarified: the reference system should be at least twice as accurate as the device's accuracy rating.
3. During the experimental period, any change in the flowmeter flowmeter should be documented and the effect of these adjustments on the reference energy under the reference conditions should be specified and expressed as a percentage of the output range.
4. In the upstream straight pipe population, the flow should be axisymmetric, and there is no significant pulsation and vortex.
It should be recognized that there are many types of reference specifications for flow measurement, those that are measured directly in basic units such as mass, length and time, and are often referred to as master references. Other devices that have been calibrated via the soil reference contain some flow meters.