VWR International VWR 10 Instruction Manual page 21

b. Service info provides you with maintenance information; you cannot modify any of the items:
• Number of pipetting cycles since last maintenance.
• Number of weeks since last maintenance.
c. Service settings gives you the option to organize your maintenance, you can set following
service points:
• Number of cycles until next maintenance.
• Number of weeks until next service.
• Service date.
• Activate or deactivate the Service alert.
Changes of service settings will reset all the service info to zero.
d. Pipette info provides information about your pipette, you cannot modify any of the items:
• Version of firmware.
• Serial number.
• Total number of cycles (one cycle: up and down of the piston).
• Number of readjustments carried out by this pipette.
Adjustment
Press the Mode-button to enter the menu. Select "Configuration" by rotating the Push-button and
click to confirm your selection. Enter the sub-menu in the same way and select the "Adjustment"
menu. The adjustment menu allows you to access the following items:
• Standard readjustment
• Reset settings
Standard readjustment
This menu allows you to adjust the pipette using 3 calibration points: 10 %, 50 % and 100 % of
nominal volume (in according with ISO8655 recommendations).
You may want to calibrate your pipette for solutions with a density, viscosity, surface tension or
vapor pressure that are different to that of water. To return to the factory settings, choose "Reset
settings", your VWR Electronic Pipette will be reset to the three factory calibration values which
are permanently stored in the pipette's firmware.
In accordance with ISO 8655 VWR recommends a gravimetric procedure for pipette calibration.
This gravimetric method is used to establish the mean mass of a given volume of water (taking into
account evaporation losses, where necessary). After converting the mean mass to a volume (using
the Z factor, see appendix II), enter the measured volumes(s) into the pipette's memory and the
software readjusts the pipette accordingly. This method requires the strict monitoring of
environmental conditions and the use of routinely controlled equipment that is adapted to the
volume being measured.
21