we can calibrate the control valve by using source meter
which is used to give 4 to 20 ma source to I/P , if any
error in the I/P ,we can adjust the zero or span of I/P.if
any error in the valve position ,adjust the zero or span in
the posisner of the control valve.
If the signal is directly connected to EP then we can use
source meter and adjusting the zero and span by giving 4
and 20 mA. If there is I/P then also this method is
applicable. Now if the pneumatic signal to the positioner
is in standard form and not working properly then we can
adjust the valve positioner for proper working..
The calibrate the control valve used for mA Source
Meter .mA Souce apply for I/P Converter so Opening Closed
for Control Valve .At the opening closed time measured for
position note.Supposed opening for Valve positioner 50% ma
13.5 So adjust the Zero or Span Calibration to Control the
% Actual Value Error Zero/Span
0 4.7mA 0.7 4mA
25 8.5mA 0.5 8mA
50 12.0mA 0.0 12mA
75 16.4mA 0.4 16mA
100 20.5mA 0.5 20mA
It is simply by using a source meter or loop calibrator.
Inject 4-20mA to the current-pneumatic converter and check
the response of the valve. If you notice that an error
occurs,you can adjust zero or span at the control
For the calibration of a control valve a loop calibrator or
a pressure calibrator can be used between 3-15psi.Check the
valve position for 3psi which is to be 0 for a NC type
valves.In such manner check the valve positon for various
ranges(6psi,9psi,12psi & 15psi).the valve positon shoul be
0 for 3psi and 50% for 9 psi and completely opened for
The same procedure is applicable for NO type valves.The
valve is open for 3 psi and completely closed for 15psi.
Any errors occured may be rectified by Zero span adjustment.
a pressure transmitter with a range of 0 to 2500kpag has a specified accuracy of
0.5 % of span.It is to be calibrated using a comparison gauge to have an accuracy
of 0.1% of span.The comparison gauge has a range of 0 to 3000kpag
What is the accuracy ratio? is this ratio acceptable?
Air pressure in a pressure vessel can rise or fall at up to 2.5kpa/s.The pressure is
sampled every 0.5 seconds.If range of the the pressure indication is 0 to 1500
kPa, what is the max value of the error due to sampling in % of Span
I am going to attend a recruitment drive by Schneider in 2
weeks. They have a technical test in the beginning. I would
like to know what are the areas i should concentrate on
while preparing for the test. My major is Electronics and