Answer Posted / Jitendra Kumar Sahu
To calibrate a Vortex Flow Transmitter in the field, follow these steps:
1. Ensure that the process is shut down and the device is safe to work on.
2. Refer to the manufacturer's instructions for specific procedures.
3. Connect the device to a known flow rate.
4. Adjust the settings according to the manufacturer's guidelines until the correct reading is obtained.
5. Repeat the process multiple times to ensure accuracy.
6. Once calibration is complete, document the results and compare them with the manufacturer's specifications.
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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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