KERN & SOHN AET 200-4NM - Manual (Page 100)

100 AET_/PET_/ILT_NM-BA-e-1410
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− Humidity
− Pressure
− Z coefficient
− Measurements and statistics
− Statistics
− Status
− Empty line
− Dashes
− Signature
− Non-standard printout
23.5. Working mode activating procedure
Carrying out pipettes calibration process requires installing an adapter for
pipettes calibration. The adapter does not come standard with the balance.
The adapter for pipettes calibration is a simple supplementary device dedicated
for calibration and checking of piston pipettes. The adapter has been designed to
minimize evaporation occurring in liquid handling procedures. It consists of a
minimized weighing chamber installed inside the weighing chamber of a balance.
The adapter features an evaporation ring and a dedicated weighing pan for
central locating of the measuring vessel.
Application of the adapter for pipettes calibration prevents from liquid
evaporation during calibration process. Small dimensions of the adapter,
combined with the evaporation ring enable maintaining high humidity rate inside
the weighing chamber and the measuring vessel, thus stopping liquid
evaporation process.
Carried out research proved that the adapter for pipettes calibration eliminates
or considerably reduces liquid evaporation process, which is essential for correct
gravimetric calibration of piston pipettes.
Selecting an appropriate adapter and balance mostly depends on type of
calibrated pipettes.
Before starting pipettes calibration process, assembly the adapter inside
balance’s weighing chamber, and insert data on pipettes to be calibrated,
including complete pipette characteristics and values of errors (see: Database of
Pipettes).
The following step is setting process’s main option:
• Number of measurements
• Request batch number (YES/NO)
• Operation with ISO 8655 (YES/NO)
• Acquire ambient conditions from THB module (YES/NO)
Caution:
Description of options and settings are given in point 24.1 of this user manual.
After setting the above options, go to pipettes calibration process.