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4194A, B, and C Series
Refer to figures 3-1 and 3-3 for adjustment locations.
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 process differential pressure equal to the
process scale span lower limit.
4. The process pointer should indicate the process
scale lower limit. If not, adjust the process pointer to
the process scale lower limit by loosening the zero
adjustment locking screw and turning the zero adjust-
ment screw. Tighten the zero adjustment locking
screw.
5. Apply process differential pressure equal to the
process scale span upper limit.
6. The process pointer should indicate the process
scale upper limit. If not, adjust the span screw to cor-
rect one-half the error as follows: clockwise to in-
crease span for a low indication (below the upper lim-
it); 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 differential pressure equal to the
mid-scale value of the process scale span. The pro-
cess 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 zero
and span adjustment procedure.
9. Adjust the process pointer to within 1 percent of
the mid-scale mark by loosening the locking screw and
turning the zero adjustment screw. This distributes the
error over the entire scale span and brings all points
within 1 percent of the process scale span.
10. Apply process differential pressure equal to the
process scale span 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 span 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.
3–4
Remote Set Point (suffix letter M) Zero
and Span Calibration
Refer to figures 3-1 and 3-3 for adjustment locations.
Refer to figures 5-21 and 5-26 for key number loca-
tions.
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. 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 decrease span for a high in-
dication.
7. Repeat steps 3 through 6 until the error is elimi-
nated.
8. Apply remote set point pressure equal 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, then pro-
ceed with step 10. If the set point indicator is not within
2 percent, proceed to the remote set point calibration
procedure in the Maintenance section.
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 lower
and upper range limits and make sure the set point
indicator is within 1 percent.
Note
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