Answer / mani

from dcs we give 4 to 20 ma to i/p converter. from i/p we give the 3 to 15 psi pnematic signal given to cv.

Answer / bert

The type of signal going to control valve is either a
pneumatic or electronic signal. For a pneumatic signal its
3 to 15 PSI or 0.2 to 1.0 kg/cm2. For electronic signal its
4 to 20 mA.

Answer / abdulbasit137@hotmail.com

two types signal come control valve 1.pneumatic signal 3 to
15 psi (2)electronic analog signal 4 to 2o milla amp

Answer / parag pathak

Control Valve is final control element of clost loop. So
signal coming to control valve will be in pneumatic form
but depends on size of Valve. It can be 3-15 PSI or 0.2 -
1kg/cm2 but it is not fixed. There is one instrument called
Positioner which will convert 3-15 PSI signal to desired
siganl depending on Control valve.

For any Contol Valve signal will come from Control room in
the form of 4-20 mA. this 4-20 mA signal was converted to 3-
15 PSI signal by instrument called I/P converter. This
siganl will go to positioner and the positioner o/p is
given to valve actuator to get desired opening and closing.

Answer / rajkumar.diice

The signal type depends on
the location of control valve!
For explosive hazard area the
signal be pneumatic and be 3
to 15psi! The converters be
mounted in somewhat
distanted area! For all control
valves the signal be 4to 20mA
over 1to 5 volts from a
control room! For inbuild
current to pressure
converters control valves the
signal be 4to20mA over 1to
5volts dc

Answer / susant

from dcs analog output signal 4-20ma dc provided to control
valve

How to calibrate radar type level transmitter for interface level? Total liquid(liq.1 and liq.2), level both the liq individually? For. Both the liquid levels how the signal will go from transmitter to dcs? How to calibrate. Single radar 9:26:55 AM for 2 different liquids in a tank?

0 Answers   Almeer Technical Services,

HELLO FRENDS ,, I M IN THE MIDST OF TROUBLE .. JUST LITTLE HELP ME... SUPPOSE ,, I HAVE A CLOSE VESSELE TANK ( HEXANE MEDIA ) ,, I M USING ROSEMOUNT 2051 DPT FOR LEVEL APPLICATION .. ITS CALIBRATE RANGE IS.. . 0 TO 950 MMH20 ..I DID CALIBRATED DPT WITHOUT REMOVING IMPULSE LINE OF HIGH AND LOW TAPPING.. & WITHOUT DISTURB 3 WAY MANIFOLD..!!! BUT ,,, DURING CALIBRATION I SELECT RANGE BY HART LRV IS 900 MMH20 & URV IS 1300 MMH20 ,, BUT ,TANK LEVEL SOMETIMES 100 % AT 1100 MMH20 , SOMETIMES 1300 MMH20 ..IN THIS CONDITION .. WHOLE LOOP FAILED ,, MAIN THING IS THAT ,, HOW TO CUSTOME RANGE SELECT ?? AND IF I USED RANGE OVER THE ORIGINAL CALIBRATE RANGE ,,,THEN WHAT ERROR WILL BE COME ??? HOW TO ZERO CALIBRATION OF DPT... HOW TO ZERO TRIM BY MANIFOLD ?? AND FOR TANK LEVEL PURPOSE ... WHICH UNIT I CAN USE ??? IS THERE ANY CALCULATION OR CALIBRATION .. IF YEH .. THEN PLZ JUST GIVE ME CALIBRATION STEPS FOR DPT.. THANKS YOURSSSSSSS

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