Instruction Manual
D200158X012
4194S Controllers
July 2018
13
Figure 3-1. Location of Controller Parts and Adjustments (continued)
C0541
35A7374‐B
49A0771‐A
PROCESS SPAN
ADJUSTMENT
REMOTE SET POINT
SPAN ADJUSTMENT
SCREW 1
SCREW 3
SCREW 2
SIDE VIEW OF
SET POINT/PROCESS
INDICATOR ASSEMBLY
SIDE VIEW OF CONTROLLER
SHOWING FLAPPER LEVELING SCREWS
1. Connect supply pressure to the supply pressure regulator, and be sure it is delivering the proper supply pressure to
the controller. Provide a means of measuring the controller output pressure.
2. For controllers with remote set point (option M), connect regulated pressure of 0.2 to 1.0 bar (3 to 15 psig) or 0.4 to
2.1 bar (6 to 30 psig) to the remote set point connection at the top of the controller case.
3. Loosen two screws (key 6), lift off the proportional band cover (key 36), and set the proportional band knob
between DIRECT and REVERSE.
The process indicator should indicate the process differential pressure. For example, with the process differential
pressure at 50 percent of the input span, the process pointer should be at 50
±
1.0 percent of its span. Slight
adjustment of the indicator zero screw may be necessary. See figure 3-1 for zero adjustment and locking screw
location.
4. If desired, the accuracy can be verified at other points on the scale. If the indicator appears to be out of calibration,
refer to the process zero and span adjustment portion of the calibration procedure.
Startup
It is recommended that the controller switching points be set as described in the calibration procedures.
Slowly open the upstream and downstream manual control valves in the pipeline and close the manual bypass valve if
they are used.