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steam drum level transmitter calibration procedure? with
example?
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Answer Posted / saif chowdhury
Steam Drum Level Xmt Basically Known as a Wet leg Transmeter. when steam drum Actual level is zero The Transmitter output will be Maximum i.e 20MA.
Calibration procedure:
Normally the range will be very minor in negative MMH20 Or Milibar. Because LO Side tube hold higher pressure than HI Side.
1. Isolate the Both Tapping Point (by operator)
2. Ensure Do not drain the impules tube which is filled water. Because txr zero will shift which will affect proper reading. only for flushing pupose you can drain if the impuls line is pluged then you have to refill the water and make zero again.
3. To calibrate the transmitter close both isolation valve txr manifold.
4. Prepare the 5 steps Calibration Input range.
5. apply the pressure by the vacum pump.
6. After complete the calibration check both condensate pot if filled with water till the neck or water level is proportion the exact tapping point.
7. open isolation Txr Isolation valve from manifold check txr. reading is zero.
8 then proceed to commission the both tapping point block valve or Isolation Valve.
Hope this answer to your question. 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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