Instruction Manual
D200158X012
4194S Controllers
July 2018
15
1. Refer to figures 3-1 and 3-2 for location of adjustments.
2. Remove the two screws (key 6) and lift off the proportional band indicator cover (key 36).
3. Set the proportional band between DIRECT and REVERSE.
4. Adjust the set point pressure to the low limit of the input range.
5. Adjust the set point indicator to the lowest limit of the input scale by loosening the zero adjustment locking screw
and turning the zero adjustment screw.
6. Adjust the set point pressure to the upper limit of the input span. Note whether the pointer indication is above or
below the upper limit of the process scale.
7. Adjust the span screw as follows: clockwise to increase span for a low indication; counterclockwise to decrease span
for a high indication. Adjust the span screw to correct one‐half the error.
8. Repeat steps 4 through 7 until the error is eliminated.
9. Replace the proportional band indicator cover (key 36), and tighten the two screws (key 6).
Figure 3-2. Location of Controller Parts and Adjustments (Remote Set Point Option)
36A9751‐C
B1668‐1
ZERO ADJUSTMENT
LOW PRESSURE
STOP
DRIVE FLEXURE
GUIDE
FLEXURE
MOUNTING
SCREW
ADJUSTMENT
SCREW
LINK B
LINK A
FRONT VIEW
SIDE VIEW
MOUNTING
SCREW
HIGH PRESSURE
STOP
PIVOT
ASSEMBLY B
ZERO ADJUSTMENT LOCKING SCREW
LINEARITY
ADJUSTMENT
CAPSULES
TIE BAR
PIVOT
ASSEMBLY A
Setting Switching Points
Direct‐Acting Controllers
The controller output signal will switch from zero pressure to full supply pressure when increasing process pressure
passes the upper switching point.