Baker Hughes Proportional Level Controller 12800

Instrument Case Mounting (See Figure 10)

Standard case mounting is left hand; i.e., with Case to left of Displacer. Right hand mounting is optional. To reverse case mounting in the field, proceed as follows: 1. Remove Torque Arm from Protective Housing as outlined in Steps 1 through 3, previous paragraph.

2. Detach Torque Tube Housing Assembly from Protective Housing Assembly by removing stud nuts.

3. Attach Torque Tube Housing Assembly on opposite side of Protective Housing Assembly.

4. Reassemble Torque Arm, Protective Housing Flange, and Top Flange. 5. Disconnect Control Link from Reversing Arc.

6. Loosen Nut securing Reversing Arc. Turn Reversing Arc over and replace Nut. Before tightening Nut, however, be sure Arc is positioned so that tabs line up with slots (arrow on Reversing Arc should point toward Displacer).

7. Connect Control Link for desired control action and specific gravity.

8. Check Control Setting Scale to see that it agrees with control action. If necessary, reverse scale and knob plate.;

Displacer (See Figure 9) To Remove: On chamber type models, close stop valves in connecting lines and drain Chamber before disassembly. The procedure for disassembly is as follows: 1. Remove Top Flange and Protective Housing Flange.

2. Depress Torque Arm and unhook Displacer. On Chamber type models, allow the Displacer to rest at the bottom of the Chamber. On top flange mounted internal displacer type models, the Displacer must be suspended in the tank with the hanger below the Torque Arm. A simple hook made of 1/8” round stock will greatly facilitate unhooking the Displacer. The hook may be inserted in one of the holes in the Hanger.

3. Detach Torque Arm from Torque Tube Plate by removing screws and withdraw Torque Arm from Chamber.

4. Lift Displacer from Chamber or tank.

To Replace: Reverse above procedure.;

Resistance Unit (See Figure 11)

On Model 12810 proportional-reset controllers, the Resistance Unit may require occasional cleaning.

Disassembly: 1. Turn Reset Knob counterclockwise and lift Reset Pointer so that it clears stop on the Reset Dial.

2. Unscrew Reset Knob to end of thread and remove.

3. Use wrench on hex of Resistance Unit body and turn counterclockwise to end of thread.

4. Pull Resistance Unit Body from Frame with twisting motion to overcome friction of O-Ring.

5. Unscrew Spring Retainer from Body and remove Spring, Spring Button, Plug, and O-Ring.

6. Blow out ports and wipe parts with clean, lint-free cloth.

Assembly: 1. Reassemble Spring Retainer, Spring, Spring Button, Plug, and O-Ring on Body.

- The following should be checked at regular intervals to obtain maximum performance of the control system

- Filter-Regulator - Accumulation of condensate from the air supply line should be removed by opening the petcock in the bottom of the drip-well.

- Control Valve - Refer to Control Valve instructions.

- Air Circuit - The frequency with which Metering Orifice and Nozzle should be checked will depend on the condition of the air supply.;

To Clean: Shut off air supply.

Disconnect Nozzle Tubing from Air Manifold. Loosen Set Screw securing Nozzle in Nozzle Bracket and withdraw Nozzle.

Diameter of Nozzle hole is .020 (No. 76 drill). Push drill or wire of smaller diameter through hole. Blow out tubing with clean, dry air.

Replace Nozzle in Nozzle Bracket. Hold Nozzle firmly against shoulder in Nozzle Bracket and tighten Set Screw. Connect tubing to Air Manifold.;