Answer / deepan.p

split range control means we have only one measurement &more
than one manipulated variable.
ex:
seal steam system of turbine &turbine driven boiler feed
pump.
description
aim of system is to maintain seal steam pressure constant.
it has two control valves name it as seal steam valve&leak
off valve.
upto (4-12)ma(3-9)psi seal steam valve operates
ex:
if its closed for 4 ma its fully open when it receives a
commend signal of 12ma.
after that (12.1-20)ma(9-15)psi leak off valve operated.
ex:
normally it'a fully open at 12ma .if commend reaches 20ma
the valve will be closed .
that what they designed the control system and field control
valve positioner.

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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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