Siemens ET 77E Series Spezifikationen PDF herunterladen (Seite 34)

SD77

3. Rotate the coil on the center shaft so that the leaf springs are perpendicular to the clamping plate and

equidistant from the center shaft.

4. Tighten the clamping plate screw.

5. Remove the shims.

6. Move the coil up and down via the center shaft. Treat the center shaft as though it were a feeler gauge being

used to check a point gap. The coil must not rub against the housing or the pole piece, and the leaf springs must

not buckle or snap.

• If rubbing is detected, repeat the alignment procedure.

• If a leaf spring snaps to a different curvature, the coil is rotated a little too far to the left or right.

Repeat the alignment procedure.

5.5 FLOAT REPLACEMENT

Removal

Refer to the parts list at the rear of this Instruction, and use the following procedure.

1. Invert the transducer.

2. Remove the bottom plate. Keep the transducer inverted to prevent spilling of the Silicon fluid. If the fluid is

spilled, it must be replaced. Refer to Damping Fluid below.

3. Gently push the float downward and remove its retaining cotter. Lift out the float.

4. Lift the float positioning spring off the center shaft.

Installation

Installation is the reverse of removal. A new gasket is recommended, and the bottom plate must be tightened

securely.

IMPORTANT

All traces of Silicon fluid must be wiped from the bottom plate, both sides of the

gasket, and the bottom surface of the housing. Otherwise, the fluid will seep past the

gasket regardless of how much the screws are tightened.

Check the amount of fluid in the bottom chamber before installing the gasket and plate. Refer to Damping Fluid

below.

Damping Fluid

The bottom chamber contains 43cc. of Dow-Corning DC-200 Silicone fluid, 200 centistokes viscosity. Small bottles

of this fluid (enough for a little more than one complete fill) may be ordered: PN 12334-43.

Check the fluid depth by inverting the transducer, removing the bottom plate, and inserting a 6" scale between the

float and the housing. Allow the scale to bottom in the housing. Fluid depth should be approximately 3/4" (19mm).

IMPORTANT

All traces of Silicon fluid must be wiped from the bottom plate, both sides of the

gasket, and the bottom surface of the housing. Otherwise, the fluid will seep past the

gasket regardless of how much the screws are tightened.

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Siemens ET 77E Series Spezifikationen Seite 34