Model A
2
O
®
Advanced Automated Osmometer User’s Guide
Measuring and control circuits (inside)
Measurement and control circuits automatically control transfer of liq-
uid sample from a primary tube to a sample tube, measure the freezing
point of the sample, and report the results to the single board computer.
Circuits verify that tubes are present in both the primary carousel and
the sample carousel. An additional circuit verifies that the correct type
of sample tube is loaded into the turntable.
Single board computer (inside)
The Windows
®
CE single board computer interfaces with the measure-
ment and control circuits and the user interface.
User interface
The user interface consists of a touchscreen display, printer, and keypad.
Most input commands can be given using either the touchscreen or the
buttons on the keypad. The printer provides a hard copy record for the
user.
Pipettor crash detection circuit (inside)
To protect the user and the instrument, a crash detection circuit stops all
motor movement should the pipette encounter any mechanical interfer-
ence. In this event, an error is reported and the instrument will use a
recovery mode.
Pipettor liquid level detection circuit (inside)
The pipettor forms part of a capacitive sensing circuit designed to detect
the liquid-air interface within the primary tube. This circuit performs
two functions:
• Ensures that the pipettor dips into the liquid a sufficient distance to
aspirate the required sample volume.
• Prevents the pipettor from dipping into the liquid a distance greater
than that which will be washed during the cleaning cycle.
To ensure proper liquid level detection when testing liquids with
extremely low dielectric properties, such as de-ionized water, use a pri-
mary tube filled to near capacity with the liquid.
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