Fisher 4194B Series Instruction Manual page 43

W4199 / IL
FLAPPER LEVELING
SCREW NUMBER 2
OBLONG HOLE FLEXURE PIVOT
IN FRAME ASSEMBLY SCREWS (KEY 12)
W4770 / IL
Figure 5-8. Leveling Screw Alignment
crease the length or counterclockwise to decrease the
length, so that the pin on the end of the link is approxi-
mately one-half of its diameter short of aligning with
the hole in the flapper assembly, as shown in figure
5-11.
23. Connect link 2 to the flapper assembly.
24. Set the proportional band between DIRECT and
REVERSE. Do this by aligning the tab on the propor-
tional band adjustment knob with the hole in the set
point beam assembly as shown in figure 5-4.
Figure 5-7. Bellows Assembly and Proportional Band Adjustment
(Process Scale and Proportional Band Adjustment Cover Removed)
FLAPPER
ASSEMBLY
4194A, B, and C Series
PROPORTIONAL
BELLOWS
BELLOWS
BRACKET
(KEY 31)
ADJUSTABLE
SET POINT PIVOT
ASSEMBLY (KEY 17)
SCREW AND
WASHER
(KEYS 19 AND 20)
LINK 4
LINK 2
FOUR SCREWS FLEXURE PIVOT ASSEM-
(KEY 10) BLY (KEY 9)
W4198 / IL
Figure 5-9. Exploded View of Flexure Pivot Assembly
25. Position the proportional band adjustment knob,
nozzle assembly, set point beam assembly, and
nozzle tubing assembly on the frame, and screw the
relay nozzle tubing assembly nut loosely onto the
frame manifold (key 135).
26. Insert the machine screw, with plain washer (keys
19 and 20), through the frame and start it into the relay
nozzle tubing assembly (key 18), but do not tighten.
27. Center the nozzle on the flapper as shown in fig-
ure 5-5 while squeezing the set point beam assembly
firmly against the relay nozzle tubing assembly. With
the nozzle centered on the flapper, tighten the ma-
FLAPPER
ASSEMBLY
AND LINK 4
5–11