Remote Set Point (Suffix Letter M) Zero And Span Calibration; Flapper Alignment - Fisher 4195 KB Series Instruction Manual

4195KA, KB, and KC Series
5. Apply process pressure equal to the process scale
span upper limit.
6. The process pointer should indicate the process
scale upper limit. If not, adjust the process pointer
span screw to correct one-half the error as follows:
clockwise to increase span for a low indication (below
the upper limit); counterclockwise to decrease span for
a high indication (above the upper limit).
7. Repeat steps 3 through 6 until the error is elimi-
nated.
8. Apply process pressure equal to the mid-scale val-
ue on the process scale span. The process pointer
should indicate the mid-scale mark, 2 percent of
span. If the error is greater than 2 percent, refer to
the Maintenance section and perform the appropriate
zero and span adjustment procedure for Bourdon tube
or capsular element controllers.
9. Adjust the process pointer to within 1 percent of
the mid-scale mark by loosening the zero adjustment
locking screw and turning the zero adjustment screw.
This distributes the error over the entire scale range
and brings all points within 1 percent of the process
scale span.
10. Apply process pressure equal to the process
scale lower limit.
11. The process pointer should indicate the process
scale lower limit 1 percent of the scale span.
12. Apply process pressure equal to the process
scale upper limit.
13. The process pointer should indicate the process
scale upper limit 1 percent of the process scale span.
14. If the error is greater than 1 percent, repeat
steps 3 through 13.
Remote Set Point (suffix letter M) Zero
and Span Calibration
Refer to figures 4–1 and 4–3 for adjustment locations.
Refer to figure 5–24 for key number locations.
Any adjustment of the remote set point
span adjustment screw requires read-
justment of the remote set point zero
adjustment screw.
1. Remove the two screws (key 6) and lift off the pro-
portional band indicator cover (key 36).
2. Set the proportional band between DIRECT and
REVERSE.
3. Apply remote set point pressure equal to the lower
range limit.
4–6
Note
4. The set point indicator should indicate the process
scale lower limit. If not, loosen the remote set point
zero adjustment locking screw and adjust the remote
set point zero adjustment screw until the set point indi-
cator aligns with the process scale lower limit. Tighten
the zero adjustment locking screw.
5. Apply remote set point pressure equal to the upper
range limit.
6. The set point indicator should indicate the process
scale upper limit. If not, adjust the remote set point
span adjustment screw to correct one-half the error as
follows: clockwise to increase span for a low indica-
tion; counterclockwise to decease span for a high indi-
cation.
7. Repeat steps 3 through 6 until the error is elimi-
nated.
8. Adjust the remote set point pressure to the mid-
range value.
9. Make sure the set point indicator is within 1 per-
cent of the mid-scale mark, and if so, proceed to step
12. If the set point indicator is not within 1 percent, but
is within 2 percent of the mid-scale mark, proceed
with step 10. If the set point indicator is not within 2
percent, proceed to the remote set point zero and
span adjustment procedure in the Maintenance sec-
tion.
10. Loosen the remote set point zero adjustment lock-
ing screw and adjust the remote set point zero adjust-
ment screw to correct for half the error at mid scale.
Tighten the zero adjustment locking screw.
11. Apply remote set point pressure equal to the low-
er and upper range limits and make sure the set point
indicator is within 1 percent.
12. If necessary, perform the process indicator zero
and span calibration procedure in this section. Other-
wise, perform the flapper alignment procedure in this
section.

Flapper Alignment

Perform the process indicator zero and
span calibration procedure and, for con-
trollers with remote set point (suffix let-
ter M), the remote set point zero and
span calibration procedure before the
flapper alignment.
Flapper leveling screw numbers and adjustments are
shown in figure 4–3. Key number locations are shown
in figure 5–24.
Provide a means of measuring the controller output
pressure by connecting the controller output to a pres-
sure gauge (open-loop conditions must exist). Do not
apply supply pressure at this time.
Note