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what is coriolis principle for mass flowmeter?
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Answer Posted / omak
If there is no flow then no coriolis effect, if there is a flow then it will make coriolis effect. In coriolis flow meter, consists of two parellel flow tubes connected with a drive coil and two magnetic pick ups on either side of the tubes. During no flow condition, the drive coil makes a small vibratio in the tubes one another. Due to this vibration the magnetic pickoff coil will generate a voltage equilant to a sine wave. In this condition sine wave created by both the inlet and outlet magnetic pick up is same.
During in flow condition, then there is a twisting in the flow tube. In the inlet side the flow opposes the vibration and in the outlet side the flow adds the vibration and makes twistinh in the flow tube. Due to this twisting the pickoff coil makes different sine wave output. By measuring the phase shift with reference time will be calculated as t in micro seconds. Multiply t with the calibration factor, we will get the mass flow in grams/sec.
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A PLC is programmed to drive three motors A, B and C as follows : After running motor A for an hour, motor B should get ON and motor A should get OFF. And after running motor B for an hour, motor C should get ON and motor B should get OFF. And after running motor C for an hour, motor A should get ON and motor C should get OFF. (That is, a cyclic repetition with time period one hour) Now, the second condition is: If any motor gone faulty and is tripped, the consecutive motor should get ON and the faulty (tripped) motor should be eliminated from cyclic repetition. The remaining two motors should bear the cyclic repetition of one hour each. (For healthy motor take logic as high and for tripped motor take logic as low) Now, the third condition is: When motor A load(Amps) exceeds 60% of its rated load, motor B should get ON in parallel to motor A. And when both motors A & B are running in parallel, and if their load exceeds 60% of their rated load, motor C should also start in parallel to A & B. [Here the cyclic repetition is eliminated, until their loads become normal(40%)] [Take logic high(1) for load at 60% and logic low(0) for load at 40%] Now draw a flow chart or a ladder diagram to fulfill the above condition.
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