Instruction Manual
D200156X012
4194HA, HB, HC Controllers
July 2018
16
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. Also, provide a means of applying
process differential pressure to the differential pressure unit.
2. For a controller with remote set point (suffix letter M), connect regulated pressure of 0.2 to 1.0 bar (3 to 15 psig)
or 0.4 to 2.0 bar (6 to 30 psig) to the remote set point connection at the top of the controller case.
3. Remove the two machine screws (key 6) and lift off the proportional band indicator cover (key 36).
4. Set the proportional band between DIRECT and REVERSE.
5. Adjust the process differential pressure until the controller indicates 50 percent of the input range. The process
indicator should point out the process differential pressure within
±
1 percent of the input span.
6. If the process indicator is out of calibration, refer to the process indicator zero‐and‐span adjustment procedures in
the Calibration section. Also, check the accuracy of the process indicator at other points on the scale.
7. For controllers with manual set point, move the set point indicator to 50 percent of the scale range. For controllers
with remote set point (suffix letter M), adjust the remote set point pressure until the set point moves to 50 percent
of the scale range.
8. The output of the controller should be:
D
0.62
±
0.007 bar (9
±
0.1 psig) for a 0.2 to 1.0 bar (3 to 15 psig) output
D
1.2
±
0.01 bar (18
±
0.2 psig) for a 0.4 to 2.0 bar (6 to 30 psig) output
9. Adjust the proportional band to 20 percent DIRECT. The output of the controller should remain essentially the
same.
D
0.62
±
0.017 bar (9
±
0.25 psig) for a 0.2 to 1.0 bar (3 to 15 psig) output
D
1.2
±
0.03 bar (18
±
0.5 psig) for a 0.4 to 2.0 bar (6 to 30 psig) output
10. Adjust the proportional band to 20 percent REVERSE. The output of the controller should remain essentially the
same.
D
0.62
±
0.017 bar (9
±
0.25 psig) for a 0.2 to 1.0 bar (3 to 15 psig) output
D
1.2
±
0.03 bar (18
±
0.5 psig) for a 0.4 to 2.0 bar (6 to 30 psig) output
alignment procedure.
12. If the controller output is within tolerance, replace the proportional band cover and go to the startup procedure.
Startup for 4194HA Controllers
Perform the prestartup checks and, if necessary, calibrate the controller prior to this procedure.
Note
When performing the startup procedure, keep in mind the initial settings are guidelines. They will vary depending on the actual
process being controlled.
1. Be sure the supply pressure regulator is delivering the proper supply pressure to the controller.
2. For controllers with:
D
manual set point:
Move the set point indicator to the desired set point.
