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Instruction Manual
D200156X012
6. Repeat steps 1 through 4 until lower, middle, and upper indications are within ±1 percent of the process scale
markings.
Replacing Auto/Manual Station (suffix letter E) Parts
Disassembly of the Auto/Manual Station
Note
This procedure also permits replacement of the switch manifold O‐rings (key 312), the auto/manual tubing assembly (key 138),
and the frame gaskets (keys 4 and 5).
Note
Before starting the following procedure, remove the controller from the case. Perform steps 1 through 7 of the Replacing the
Differential Pressure Unit procedure. Then, perform steps 1 and 2 of the Replacing the Case and Cover procedure.
Refer to figures 6‐5 and 6‐4 for key number location.
1. Perform the procedures referenced in the note above.
2. Loosen the screw (key 316) holding the auto/manual station (key 273) to the controller frame.
3. Loosen the two screws (keys 314 and 315) holding the auto/manual station to the auto/manual tubing assembly
(key 138).
4. Remove the auto/manual station from the controller frame.
5. Remove the switch manifold O‐rings (key 312).
6. Carefully loosen the nut on the relay nozzle tubing assembly (key 18, figure 6‐1) where it connects to the
auto/manual tubing assembly (key 138). Loosen three screws (keys 34 and 131) and remove the tubing assembly
and body gaskets (keys 4 and 5).
7. Inspect the gaskets (keys 4 and 5) and O‐rings (key 312) for wear. Replace if necessary.
Assembly of the Auto/Manual Station
1. Install the gaskets and the tubing assembly to the frame. Start, but do not tighten, the three screws (keys 34 and
131) and the nut on the nozzle tubing assembly (key 18).
2. Install the three O‐rings (key 312) and secure the auto/manual station to the controller frame with the screw (key
316) and to the tubing assembly (key 138) with two screws (keys 314 and 315). Do not tighten any screws.
CAUTION
In the next step, take care to tighten the two screws (keys 314 and 315) evenly. Uneven tightening could damage the
tubing assembly.
3. Position the auto/manual station as far down on the frame and toward the scale as possible. Carefully tighten the
two screws (keys 314 and 315) so the auto/manual station contacts the three pads on the tubing assembly.
4. Carefully tighten the remaining screws and nuts.
4194HA, HB, HC Controllers
July 2018
75
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