Replacing The Gauges; Replacing The Links - Emerson Fisher 4194HA Instruction Manual

4194HA, HB, HC Controllers
July 2018
7. Reinstall the differential pressure unit using the proper procedures.
8. Mount the controller as described in the Installation section.
9. Connect the supply pressure and output piping to the controller. Connect the process differential pressure to the
differential pressure unit.
10. Perform necessary calibration steps.

Replacing the Gauges

CAUTION
Before performing this procedure, be sure the replacement gauges are the correct range so the gauges are not damaged by
overpressure.
1. Unscrew the output gauge (key 46) or the supply gauge (key 47) from the frame (key 3).
2. Before installing the replacement gauge, coat the threads on the gauge with a suitable sealant.
3. Screw the replacement gauge into the frame.
4. Apply the correct supply pressure and check for leaks with the nozzle capped for full output pressure.

Replacing the Links

This section describes the separate replacement of four links in the controller. To clarify the location of each link, the
links are numbered as follows:
D Link 1 connects the drive arm and the process indicator.
D Link 2 connects the process indicator and the input feedback beam assembly (key 11).
D Link 3 connects the set point adjustment and the set point beam assembly (key 23).
D Link 4 (key 65) connects the input feedback beam assembly and the bellows bracket assembly (key 31).
Figure 5‐5 show the location of each link.
46
Instruction Manual
D200156X012