Thread Content
The measuring container used in the standard volume method for electromagnetic flowmeters is a device with high precision markings; although its accuracy is high, its capacity is quite limited. This system uses a water level tank as the measuring vessel, and the cross-sectional area of this water level tank has been calibrated using a precision measuring tank. Since the water tank needs to have its liquid level measured, there is a buffer tank in the middle of it. This buffer tank is separated from the main water tank by a partition with holes in its lower part, and it functions as part of the liquid-level tank for storing liquid water. To ensure verification accuracy, when using the volume method for verification, the liquid level above the opening position of the tank partition can be used as the measuring tank. There are two methods for calibrating electromagnetic flowmeters: dynamic calibration and static calibration. The dynamic verification method involves allowing liquid to flow into a standard container at a constant rate, and then measuring the rise in the liquid level within a fixed time interval, or the time required for the liquid level to rise by a certain amount. The stop-check method involves using a stop valve or switching mechanism to allow a fixed volume of liquid to enter a standard container, and measuring the time interval from the start of inflow until the flow stops. Experimental steps: ① Before the experiment, fill the water tank with enough water, generally to about 4/5 of its capacity. Then open valves F1-2, F1-3, and F1-7 fully, while closing all other manual valves ； ② Connect the output of the \"electromagnetic flowmeter\" to the \"0～5V/1～5V input\" terminal of Intelligent Controller I, and connect the \"4～20mA output\" terminal of Intelligent Controller I to the control signal input terminal of the \"electric control valve\" ； ③ Turn on the single-phase air switch in the instrument control panel of the object system to power all the instruments ； ④ Basic parameter settings for Smart Meter I: Sn=33, DIP=0, dIL=0, dIH=1200, oPL=0, oPH=100, CF=0, Addr=1 ； ⑤ Manually adjust the opening of the electric control valve to around 20%, turn on the power supply for the centrifugal pump located in the instrument control box to supply water to the liquid level tank. Control the outlet valve F1-7 of the liquid level tank so that the liquid level remains stable at around 30 cm; make sure it does not drop below the level corresponding to the openings in the partition. Observe and record the stable liquid level after 1 hour, as well as the instantaneous flow rate value vq measured by the electromagnetic flow meter ； ⑥ Close the outlet valve F1-7 of the water tank, and start a stopwatch to keep track of the time. At the moment when the liquid level reaches 50 cm, close the inlet valve F1-3, then turn off the centrifugal pump and stop timing. Observe and record the actual liquid level at that moment, as well as the time t indicated by the stopwatch ； For more information, please visit the company’s official website at http://www.yb1518.com/. Please keep this link when reproducing the content! http://www.yb1518.com/UploadFiles/2012717174126829.jpg