Answer / laxmidhar ,nmiet bbsr

we need,
miliamp source(giving supply to i/p)
i to p converter(pressure signal to control valve)
air supply(for input to i/p and control valve)
multimeter(miliamp check)
small screw driver(for adjust zero and span)
and check

4ma for 0
8ma for 25%
12ma for 50%
16ma for 75%
20ma for 100%

Answer / ramkumar

We can calibrate the Controlvalve by using the mA feeder
(make-DRUCK).while calibrating the I/P using mA calibrator
error occurs adjust Zero and span in the I/P .

Answer / uprabhagaran

MA sourse

Answer / zuheir beilouni

Use a current source to calibrate the I/P converter error ,
but if the error was in the valve , calibrate the valve
positioner using Wallace and Tiernan calibration box or for
fast calibration couple a monostat gauge to calibrate and
if both were ok problem lies in the solenoid then check the
supply to it

Answer / biju

We can calibrate a control valve by connecting a HART/FF
communicator to the valve and then doing Autocalibration
through the instrument...

Answer / mustafa ahmad

mA SOURCE & HART COMMUNICATOR WILL USE FOR THE CALIBRATION
OF CONTROL VALVE .WHEN U CALIBRATE THE CONTROL VALVE THAT
TIME U FOUND ANY ERROR . YOU DO AUTO CALIBRATION BY HART
COMMUNICATOR . WHEN AUTO CALIBRATION WILL FINISH , YOU DO
THE STROKE CHEK BY HART COMMUNICATOR OR mA SOURCE

Answer / dhanasekaran c

Depends upon the valve. Pneumatic calibrator for 0.2to
1.00kg/cm2 Valve.For Electronic positioner( 4-20ma) We can
use Loop calibrator. For Smart type of positioner fixed
valves smart calibrator 275 or 375 or 475(latest) must be
used. Field bus MC5 hand held calibrator can be used.

Answer / antionyo

control valve calibrator

Answer / abinecious

SCANDURA

Answer / janardhan reddy

we can calibrate the control valve by using the dead weight
tester and transmitter and pid controller,

If we increase only P what will be controller action ?

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hello this is dhinakar i am completed my instrumentation engg . recently i got job in sugar industry side. i like to ask one question can any one say what are the things i have to follow know more about industrial instrumentation,,,,,,,

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I work on a electronic positioner transmitter 4211 at the field.I connect my multimeter in series to get the current output then I calibrate it to 4ma in 0% of position of the valve and 20ma in 100% position of the valve.My problem is in the field I get the correct output current based on my multimeter but in the dcs they only receive 40% in a output 20ma of this positioner.Then I try to simulate in this analog card and they receive the equivalent percent on the value that I simulated.Is ther any possibility to reset the zero and span of this positioner 4211 fisher.And what other possibility I can do to fixed this.This is my email add ( landicho_randy@yahoo.com )

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