Instruction Manual
D200158X012
4194S Controllers
July 2018
45
WARNING
In step 4, do not exceed the operating limits for the controller (refer to table 1-3). Personal injury or equipment damage
may result from overpressure.
4. Slowly increase the process differential pressure from zero until the output pressure snaps to supply pressure. The
output pressure should snap to supply pressure within
±
2 percent of set point.
5. If the output snaps to supply pressure below 2 percent of set point, adjust flapper leveling screw number 3
clockwise. If the output snaps above 2 percent of set point, adjust flapper leveling screw number 3
counterclockwise.
6. Repeat steps 4 and 5 until the output pressure snaps within
±
2 percent of set point.
7. Adjust the proportional band adjustment between DIRECT and REVERSE.
8. If the output pressure snaps to supply pressure, depress the flapper with a screwdriver so the output pressure snaps
to zero pressure. Slowly release the flapper. If the output snaps to supply pressure, adjust flapper leveling screw
number 2 clockwise until the output does not snap to supply pressure. Then, adjust screw number 2
counterclockwise 1/8 of a turn at a time until the output snaps to supply pressure.
9. Repeat step 8 to recheck the adjustment of flapper leveling screw number 2.
10. Adjust the proportional band adjustment to 5 percent reverse acting.
11. Carefully adjust the process differential pressure to 100 percent of the process scale range. Then, slowly decrease
the process pressure until the output pressure snaps to supply pressure. the output pressure should snap to supply
pressure within
±
2 percent of set point.
12. If the output pressure snaps to supply pressure below 2 percent of set point, adjust flapper leveling screw number 1
counterclockwise. If the output snaps to supply above 2 percent of set point, adjust flapper leveling screw number 1
clockwise.
13. Repeats steps 11 and 12 until the output pressure snaps within
±
2 percent of set point.
14. Repeat steps 3 through 13 to recheck adjustments. Continue to adjust flapper leveling screws 1, 2, and 3 as
necessary until no flapper adjustments are required.
15. Set the proportional band adjustment to 400 percent in the desired controller action. Replace the proportional
band indicator cover (key 36), and tighten the two screws (key 6).
Remote Set Point (Option M)
Replacing Parts
WARNING
Refer to the Maintenance WARNING on page 21.
Note
After part replacement, perform the Maintenance Calibration procedures.
Figure 3-2 shows the location of the parts. Key numbers refer to figure 5-3.
