37
The Advanced
®
Model 3250/4250 Service Manual
Osmometer/Cryoscope Well Cleaning
B
C
A
Use this procedure to clean the well and tub-
ing of any foreign matter (e.g., broken glass)
that may have fallen into the well.
Tools needed: Flat-bladed screwdriver;
Phillips screwdriver; Tru-arc pliers; thin, stiff
wire; 4” cable tie; small wire cutters.
Osmometer Well Cleaning
1. Turn off the power and unplug the instru-
ment.
2. Remove the head cover and instrument
cover (see Removing the Head Cover &
the Instrument Cover).
3. Drain the cooling system (see Cleaning
and Maintenance).
4. Disconnect the fluid pump from the cool-
ing well, as follows:
a. Unwrap refrigeration tape (A). Save
for re-use during reassembly.
b. Cut and remove the cable tie.
c. Pull the tubing off of the cooling well
inlet port.
5. Using a pair of Tru-arc pliers, remove the
Tru-arc retainer ring (B) from inside the
well. (Save the retainer ring for replace-
ment when cleaning is complete.)
6. Remove the white Delrin elevator and
spring (C). (Save for replacement when
cleaning is complete.)
7. Inspect the bottom of the well and
remove any visible debris. Be sure to
clean out the small hole at the bottom of
the well.
8. Using a thin stiff wire, insert it into the
well inlet port.
Note: The wire diameter MUST be small
enough to pass through, into the well.
The .050” diameter X 4.00” long
4LH243 stir wire is ideal.
9. Push the wire into the well. Repeat this
process several times, sliding the wire
back and forth until the end of the wire is
visible in the hole at the bottom of the
well. (This should loosen any deposit
trapped in the tube and the well.)
10. Reassemble the pump tubing to the well,
apply the cable tie, and then reapply the
refrigeration tape.
11. Using a solution of 1:5 bleach in distilled
water, place the filter and well return line
into this solution. Manually press the
pump up and down until the solution has
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