Answer / s. kanniyappan

The measuring the difference between HP and LP of a process
will give dp.

By connecting a pressure source with t-off to master gauge
to the HP side and venting the LP side to the atmosphere,
varying the pressure according to the range and measuring
the mA in series and adjusting zero and span according to
the variation.

In case of of Dry leg connecting a pressure source with
t-off to master gauge to the LP side and venting the HP side
to the atmosphere, varying the pressure according to the
range and measuring the mA in series and adjusting zero and
span according to the variation.

Answer / senthil

CALIBRATION OF A DP TRANSMITTER VARIES DEPENDING ON ITS
RANGE ( POSITIVE OR -IVE TO +VE)
FOR EXAMPLE:IF THE RANGE IS 0 TO 10BAR IS THE RANGE-
U HAVE A FIVE WAY MANIFOLD ON THE
TRANSMITTER.THE POSITION SHOULD BE
- VENT VALVE TO BE CLOSED
-LP ISOLATION VALVE IS OPENED AND VENT TO ATM
- CONNECT THE CALIBRATOR(DRUCK OR HYDRAULIC PUMP) ON THE HP
ISOLATION.
SINCE OUR RANGE IS OF POSITIVE VALUE.WE APPLY CORRESPONDING
PRESSURE ON THE HP SIDE..0,2.5,5.0,7.5,10

FINALLY DONT FORGET TO CONFIGURE IT AS SQUARE ROOT USING
HART COMMUNICATOR IF WE USE IT FOR A FLOW MEASUREMENT..

Answer / amith.patil17@gmail.com

Differential pressure Can be simply measured by DP
transmitter which is connected to the two tapping point
with difference in pressure in both points this DP is
connected after the Threeway manifold valve whose advantage
to calibrate the transmitter on the site by opening the
middle valve so that to get 4mA,else this Pressure change
in level or the flow causes the material dimension change
which material is connected to transmitter which acts as a
resistance to a wheatstone bridge which generates rhe
corresponding current which is transmitted to the control
room.

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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