RADWAG PS 510.R2.CT Carat Balance - Manual (Page 136)

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18.12 Pipettes calibration
(only XA and AS balances)
Pipettes calibration function applies to fixed volume pipettes and adjustable volume
pipettes. During volume testing procedure, the software determines accuracy and
repeatability errors for tested volume. In case of pipettes with adjustable volume
errors for Max, Min and ½ Max volume are estimated.
All pipettes are tested for accordance with requirements of PN-EN ISO 8655:2003.
During the tests dosing repeatability and accuracy are monitored.
In order to ensure the highest accuracy of pipettes calibration process,
maintain the following ambient conditions at a workstation:
• Ambient temperature of a pipette, tips and liquid should be kept between
20°C - 25°C with change rate during testing within ± 0.5°C - 111 -
• Relative humidity 50 - 75%
and
• Use distilled water for pipettes calibration processes
• A pipette, tips and distilled water should be stabilized for temperature in
the weighing room. The reference norm advises that minimum
acclimatization time for above mentioned is 2 hours.
18.12.1. Additional settings of pipettes calibration mode
Additional settings have been designed for calibration mode operation. These
settings complete the standard ones.
The options are as follows:
• VOLUME DETERMINATION – allows to predefine numer of tested
volumes for a particular pipette. For pipettes with fixed volume please set
parameter <1>, for pipettes with adjustable volume set parameter <2> and
<3>.
• MEASUR. NO – allows to predefine numer of measurements for each
tested volume. Number of measurements ranges from 6 to 20.
• AUTOMATING TARRING - allows to turn on function of automatic taring
of dosed portion of water after confirmation of measurement (value set to
<YES>)
Remember to select correct values of the above options before pipettees
calibration procedure is performed. The settings should reflect expectations
and needs being a result of working environment.