6 – Maintenance
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6.2.6 Cleaning the Barcode Scanner Window
There are no user-serviceable parts in the barcode scanner. After a period of use, you may find that the
barcode scanner does not seem to scan barcode labels as easily as before. If this happens, you can
try to solve the problem by cleaning the scanner’s window. To clean the window, use a damp, lint-free,
non-abrasive cloth. Dry the window with a dry lint-free non-abrasive cloth.
6.2.7 Reuniting Separated Fluid in Thermometer
If the liquid column in your temperature QC thermometer becomes separated, the techniques below
can be used to reunite it.
1 Should there be a separation in the upper part of the capillary or in the expansion chamber at
the top, put the bulb in boiling water. Allow the liquid and the separation to enter the expansion
chamber at the top of the thermometer.
2 Remove the thermometer from the boiling water, and quickly tap it on the surface of a large
rubber stopper in the upright position allowing the gas separating the column to rise above the
column. Allow to cool slowly in the upright position, and re-examine the thermometer before
putting into service.
3 Should the separation occur in the lower portion of the column, cool the bulb in a mixture of
methanol and dry ice. Keeping the thermometer in an upright position, allow the liquid and the
separation to retreat into the bulb. As soon as the liquid enters the cone of the bulb (upper
portion), remove the thermometer from the mixture.
4 Swing the thermometer (bulb down) in a short arc to allow the gas separating the column to
rise above the column.
5 Allow the thermometer to warm up slowly in the upright position and the liquid to re-enter the
capillary tube before touching the bulb.
6 Re-examine the thermometer before putting into service.
WARNING
HANDLE INSTRUMENTS WITH CARE. WEAR SAFETY
GLASSES AND GLOVES BEFORE PROCEEDING.
NOTE
Overfilling the expansion chamber will break the thermometer.
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