SECTION 3
OPERATING THE VAPRO OSMOMETER
3.6 Standby or Waiting Periods
When the instrument is not in use, leave the cleaned
sample holder empty and locked in the measure-
ment position. If the chamber is left open for longer
than 2 minutes, a warning chime sounds.
When in the standby mode, the Vapro osmometer is
not idle. It continuously monitors its internal operat-
ing temperature and compensates for changing
ambient temperatures that would otherwise result in
calibration changes. It also maintains a continuous
balance in its thermocouple control circuitry to
ensure convergence of the thermocouple to the pre-
cise dew point temperature during the measurement
cycle.
These internal functions are necessary to maintain
accurate performance. That is why we recommend
that the osmometer be left under power when not in
use. It is also why long measurement sessions
should be interrupted periodically to allow the instru-
ment one full measurement cycle on a dry, empty
chamber.
NOTE:
Occasionally, after a series of runs, an osmolality reading
appears on the screen after cycling on an empty cham-
ber. This may be due to residual moisture on the sample
holder. If this occurs, withdraw the sample slide and thor-
oughly clean the sample holder using lint-free tissue.
Then return the slide to the measurement position and
close the sample chamber.
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