Remote Set Point Zero And Span Adjustment - Emerson Fisher KC Series Instruction Manual

4195KA, KB, KC, and KS Controllers
5. Replace the tie bar (key 106) and install the two
screws (key 103).
Remote Set Point Zero and Span
Adjustment
WARNING
Refer to the Maintenance WARNING
on page 6-1.
For routine remote set point zero and
span calibration, refer to the
appropriate procedures in Section 3,
4, or 5. Use the following maintenance
remote set point zero and span
adjustment procedures only if
difficulty is encountered with the
routine procedure or nonlinearity
occurs.
Refer to figures 6-19 and 6-23 for adjustment
locations.
1. Decrease the remote set point pressure to 0
percent of the remote set point input range.
2. The set point indicator should indicate the lower
limit of the process scale span. If not, loosen the
adjustment screw on link A (key 116), and adjust the
length so the set point indicator points to the lower
limit of the process scale. Tighten the screw.
3. Make fine zero adjustments by loosening the
zero adjustment locking screw (key 102) and turning
the zero adjustment screw (key 108). Tighten the
locking screw. Refer to figure 6-23 for the screw
locations.
4. Apply remote set point pressure equal to 100
percent of the remote set point input range.
5. The set point indicator should indicate the upper
limit of the process scale span.
6-40
Note
6. To increase the span, proceed as follows:
a. Turn the remote set point span adjustment
screw clockwise.
b. To increase the span further than the
adjustment screw allows, move both ends of link
A (key 116) to the right.
c. Make fine adjustments with the remote set
point span adjustment screw.
7. To decrease the span, proceed as follows:
a. Turn the remote set point span adjustment
screw counterclockwise.
b. To decrease the span further than the
adjustment screw allows, move both ends of link
A (key 116) to the left.
c. Make fine adjustments with the remote set
point span adjustment screw.
8. Repeat the adjustments until the upper and lower
indications are aligned with the upper and lower
limits on the process scale.
9. Adjust the remote set point pressure for 50
percent of the remote set point input range.
10. The set point indicator should indicate mid-scale
±2 percent of the process scale span. If the error is
within ±2 percent, proceed to step 11. If the error is
greater than ±2 percent of the scale span, proceed
to the remote set point linearity adjustment
procedure.
11. Adjust the set point indicator to mid-scale ±1
percent of the process scale span by loosening the
zero adjustment locking screw and turning the zero
adjustment screw. Tighten the locking screw.
12. Adjust the remote set point pressure to the
upper and lower limits of the remote set point input
range and make sure the set point indicator is still
within ±1 percent at the lower and upper limits of the
process scale.
13. Perform the appropriate flapper alignment
procedure and, if necessary, the process indicator
zero and span calibration procedure in Section 3, 4,
or 5.
Instruction Manual
Form 5207
April 2007