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Why do we need to install hook-up line differential pressure
type level transmitter when the differential pressure type
level transmitter with capillary are available?
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Answer Posted / sam
Capillary level transmitters are the best for just about any
application but they are very expensive compare to a normal
DP Cell with tubing.
The problem with these capillary transmitter installations
are that a lot of installations and designs are done without
flushing rings and equalization tubing and valves. This then
have to be installed afterwords since they are needed during
calibration once you start working on vessels with a process
pressure of 10bar and up. Without these the calibration will
become more inaccurate the higher your vessel process
pressure is. Be aware we still have static alignment
problems even in this day and age of smart technology.
Unless you do a process zero before your calibration you are
going to pick up problems and the only way to do a process
zero is if these flushing rings and tubing is installed from
the HP to the LP tap off points.
Good Luck
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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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