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.

how to calculate MMWC values in to Tonns(MMWC values showing in DP transmitter and Tonns value showing in Totalizer). please tell me details?

2 Answers   Chemin C I, MSP,

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What is basic of instrumentation

8 Answers  

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Paper Details: company -- Hindustan Copper Limited post -- GET 2008 Date -- 03.08.2008 Dept.-- Electronics?Instrumentation Aptitude -- 70 Technical-- 80 Total Time -- 2hr 30min I have listed the question I could able to remember 1. BCD equivalent of 43 2. value of K for stability of a system from a given equation 3. transformer connection for darlington connection 4. damping of balastic galvanometer 5. advantage of chart-pen recorder over CRo 6. CRO - how to change bandwidth 7. questions on CRO construction 8. reverse saturation current of si diode 9. advantage of wire wound resistance over carbon resistance 10. core material for a small coil 11. max fanout-- TTL/ECL/CMOS/MOS 12. component of resistance of monolithic IC 13. functions of capacitors in multivibrators 14. to change a sawtooth signal into a square wave we use-- schmit trigger/ schottkey diode/ zener diode 15. relation b/w á & â in transistor ckt 16. function of SiO2 layer in fabrication 17. 3 questions on ODD MAN OUT

2 Answers   HCL, L&T,

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how many types of thermocouple cable are? give the name of each type.

1 Answers   Fabco,

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what is the meaning if the control valve CV is 27,in terms of selecting procedure?

2 Answers  

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on interface level transmitter model(RTG3302-EMERSON) What is threshold valve how can we select correct threshold value T1,T2,T3,T4 When interface water & hydro carbon

0 Answers  

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What do you do as a Engineering person EPC for Sizing&Selecting Control Valve?

1 Answers  

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, Instrument Index, P&ID review, I/O schedule, datasheet, DCS / Analyzers specifications, loop diagrams, hook-up drawings.

0 Answers  

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our kks tagging is crossing more than 12 character please suggest how to take tags in the DCS

0 Answers  

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wht is snap action switch?where it is used?is there any diff between snap action switch and normal pressure switch?

1 Answers   ONGC,

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What is the difference between HMI and Scada?

4 Answers   Schneider,

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what does 5/2 solinoid valve means?

5 Answers   UltraTech,

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