Claire Corlett

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Calibrating a Fisher™ 3582 Positioner – Beam Alignment

Calibrating a Fisher™ 3582 Positioner – Beam Alignment


hi I’m Jim Jones with Emerson in this
video I’m going to show you what you may need to do before you calibrate this
Fisher 3582 pneumatic positioner of course we want to always make sure we
review and are familiar with all of the safety precautions and procedures found
in the instruction manual for the 3582 positioner okay the positioner has
already been properly mounted onto this Fisher 6 5 7 size 40 I direct-acting
actuator we’ve hooked up the air supply and made sure the regulator is set to
the proper pressure in this case 20 psi and we’ve installed the air line from
the positioner to the actuator so let’s first identify the components
of the positioner that we’ll be working with the D shaped beam here is the
summing beam and is the component this flapper assembly moves around on notice
the summing beam is labeled direct over here and reverse over here the cam which
is attached to the rotary shaft feedback arm is behind the summing being down
here at the bottom this cam labeled a is the linear cam make sure the arrow on
the cam points in the direction of actuator stem travel on this direct
acting actuator increasing diaphragm pressure drives the stem down so the
arrow must point down the nozzle is located right here the bellows is behind
the beam and in the upper right corner there are two pins and one screw that we
will adjust in this initial setup procedure one pin is directly above the
nozzle and it’s called the beam pivot pin the other pin is located just in
front of the bellows and is called the bellows pivot pin the screw we will
adjust is on the flapper assembly we want to make sure that the beam is
totally to the nozzle so the flapper approaches
the nozzle squarely to do that we may need to do a beam alignment now if you
have a brand new 3582 positioner you shouldn’t need to do this beam alignment
procedure but it doesn’t hurt to check it commonly you will need to check beam
alignment if the positioner has been rebuilt and any components replaced if
the positioner is to be split ranged or the positioner is acting in a
non-standard way step one is to loosen the locknut around the nozzle turn the
nozzle in all the way and then back it out for complete turns step 2 increase
the input signal to the middle of the input range in other words on a 3 to 15
psi input take the pressure to 9 psi step 3 move the flapper assembly to
place it over the cam down here at position 0 now check the rotary shaft
arm if the index marks on the arm are not aligned with the ones on the case
adjust the follower assembly screw until the marks are aligned when they are
parallel tighten the locknut on this assembly this will be the only time we
will need to adjust this screw now in step 4 we move the flapper assembly to
the number 10 on the direct side of the beam check the feedback arms if they are
not parallel adjust the bellows pin using an eighth inch wrench until they
are go to the reverse side and check the arms again if they are not parallel
adjust the beam pivot pin above the nozzle you may need to repeat this
direct 10 reverse 10 procedure a few times until there is no movement in the
arms and they stay parallel regardless of where the flapper assembly is placed
if the arms don’t move when the flapper assembly is on either side of the
summing beam beam alignment is complete just make sure all the lock nuts are
tightened the only thing left to do now is to zero and span the positioner but
I’ll show you how to do that in another video so the first part of calibrating a
Fisher 3582 positioner is making sure the beam is aligned with the nozzle and
we can do that in just four easy steps first turn the nozzle all the way in and
then out for complete turns next set the input signal to the middle of its range
then move the flapper assembly over the cam and adjust the flapper assembly
screw to align the feedback arms step four is to move the flapper assembly
from direct ten and then to reverse ten to align those arms using both the
bellows pin and the beam pivot pin finally when you’re all done tighten up
the lock nuts and that’s it visit Fisher.com to learn more about the Fisher 3582 positioner or to contact your local
Emerson sales representative thanks for watching

9 comments on “Calibrating a Fisher™ 3582 Positioner – Beam Alignment

  1. Great video! Question … if you want to do a beam alignment but your positioner is out of calibration, would you perform step two to the mid range value of your current calibration as opposed to 9 psi? For example if my positioner was supposed to be 3-15 but it saturated at 14 (3-14) would I set step 2 at 8.5, perform the beam alignment, then adjust my zero & span to 3-15?

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