Answer Posted / yomama

The impulse tubes must be filled with process fluid or fill
fluid such as glycol. Additionally the specific gravity of
the fill fluid must be calculated in reference to the
process fluid being measured

Glycerin (Specific Gravity=1.26) for the impulse tubes a
correction must be made.

DP span of 100”= physical height difference of impulse tubes
on vessel

SG of fluid being measured (Oil = 0.68)

Glycerin filled tubes (SG = 1.26)

Since the Low Pressure Leg will be filled with Glycerin we
multiply the span by the SG of the Fill Fluid

100” x 1.26 = 126” so the Lower Range value will be -126”
Span will be the LRV – (SG of fluid) x ( tank Level span) = 68”

-126” + 68” = -58”
-126 LRV
-58 URV

please send data bank of quetions answers on analytical instrumentation.

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hye SAM acn u send your e mail id, so that i can solve my query through e mail?

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Question on maha cement

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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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