46 Picus
®
2 Operating Instructions
Cleaning and Maintenance
9.4 Performance Check
It is recommended that the device performance be reviewed regularly. This
should be done after every in-house maintenance procedure or at least
every three months.
We also recommend that the operator develop a regular test routine that
takes the following criteria into account:
— Accuracy requirements of the relevant application
— Frequency of use
— Number of operators for the device
— Nature of the liquid dispensed
— Acceptable maximum permissible errors (ISO 8655-2)
The performance review should be carried out in the corresponding
ambient conditions (see Chapter14.2, page53). The device, filter tips
and test liquid should be stored in the room for at least two hours so that
they can adjust to the room temperature.
Sartorius specifications are achieved in strictly controlled conditions
(ISO8655-6). We recommend defining an acceptable error range that
reaches the application area and the accuracy conditions under which the
device is operated.
9.4.1 Weighing
Materials: — Distilled, de-ionised water (ISO 3696, quality 3)
— Test water vessel
— Pipette tips
Tool: Analytical balance scales in compliance with ISO 8655-6
Requirement
The “Pipetting” pipetting mode is set on the device.
Procedure
t Set the desired test volume.
t Place the tip on the cone.
t To achieve a humidity balance in the unused air volume: aspirate and
dispense the test water five times with the filter tip.
t Replace the tip.
t To prewet the tip again:
t Hold the device vertically and submerge the filter tip just 2–3mm un-
der water.
t Press the operating button.
t Pull the device vertically out of the water and wipe the tip on the side
wall of the test water vessel.
t To pipette the water into the vessel: Wipe the tip above the liquid level at
an angle of approx. 30° to 45° on the side wall of the vessel while pulling
the device 8–10mm along the inner wall.
t Read the weight in mg/s (mi).
t Repeat the test cycle nine more times
To Next Page
Loading...
