Advanced Instruments 3300, User Manual

Page: 52 / 77

• “ Sample Pre-freeze ” errors begin to occur quite frequently.
When indicated, the cooling chamber may be damp cleaned as follows.
1. Dampen (do not saturate) the end of a chamber cleaner with 70% iso-
propanol solution.
2. Firmly insert the dampened chamber cleaner all the way into the sam-
ple port, rotate it four or five times (clockwise and counter-clock-
wise) and withdraw.
3. Repeat with a dry chamber cleaner. Insert and leave a clean, dry
chamber cleaner in the sample port until the next sample is to be
tested.
Sample plunger replacement and verification
To ensure proper instrument operation, you should replace the plunger
tip of the sampler every 500 tests (or every package of sample cells).
To replace the plunger tip, use the following procedure.
1. Unscrew the calibration gauge and key.
2. Rotate the sampler shaft until the calibration setscrew appears
beneath the access hole in the side of the sampler body.
3. Place the key end of the calibration gauge in the access hole and turn
counter-clockwise to loosen the setscrew.
4. Carefully remove the old sampler plunger wire.
5. Place a sample tip on the sampler to help you place new wire cor-
rectly.
6. Slip the sampler plunger wire into the sample cell so the Teflon
plunger tip protrudes about 1/16 ” or 1.6 mm from the end of the
sample cell.
7. Using the key end of the calibration gauge, push the plunger into the
sampler as far as it will go.
Advanced
®
Osmometer Model 3300 User’s Guide
34