Page 30 VK 7025 Dissolution Apparatus Revision H, 11/10
Setup Operator’s Manual P/N 70-9033
Varian, Inc.
Step 7. Rotate each shaft locking ring so the drive positioning teeth on both the
shaft locking ring and the shaft collar rest against one another, locking
the shaft in place.
Step 8. Tighten the set screws using the 7/64-inch T-handle Allen wrench
provided.
Step 9. Raise the drive unit to its home position. Remove the height spheres
from the vessels.
Step 10. Lower the drive unit until it stops. The paddles are set at the
USP-specified height of 25 ± 2 mm above the bottom of the vessel.
Installing Basket Shafts
Step 1. Raise the drive unit to its home position.
Step 2. Carefully insert a basket shaft into each spindle until approximately half
of the shaft is above the top of the spindle.
Step 3. Clip the basket height gauge onto a shaft.
Step 4. Press and hold DRIVE DOWN until the drive unit is at its lowest position.
Step 5. Gently press down the basket shaft until the bottom of the gauge rests
against the bottom of the vessel. Be careful not to use excessive
pressure or the bottom of the vessel may crack.
Note
There is a safety mechanism in the bottom of the left side guide
rod which keeps the drive unit from lowering improperly. If the
rods do not line up precisely with the holes in the vessel plate,
the mechanism engages and the drive unit stops lowering and
rises to the home position. See Figure 4, “Drive Unit Guide
Rods,” on page 24.
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