Specification; Instructions For Use; Priming Reservoir; The Volume Adjustment Knob - VWR ZIPPETTE PRO Manual De Instrucciones

Specification

Accuracy ≤±0.3% on maximum delivery and a precision ≤0.1%CV using distilled water at 20 ºC.
Testing takes place according to DIN EN ISO 8655 using maximum nominal volume of distilled water at
20 °C, with a uniform and smooth dispense action.

Instructions for use

Priming reservoir

Place a container under the Zippette Pro's dispense nozzle.
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Turn the volume adjustment knob to 30 ml to enable free movement of the piston.
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Open the dispense anti-drip tap.
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Prime the unit with a few gentle up and down strokes, taking the piston right down to its lowest stop
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position and lifting it up approximately 25 mm.
Repeat until a steady, bubble free flow is visible in the dispense tube.
•

The volume adjustment knob

Turning the volume adjustment knob (Drawing 1) clockwise, will increase the volume to be dispensed.
Each full revolution of the knob represents 2 ml and is shown on the cursor aligned to the graduations.
For fine volume adjustments, turn the knob a quarter turn in either direction for 0.5 ml adjustment.
User calibration procedure
Your Zippette Pro has been laboratory calibrated to its nominal volume of 30 ml. However, due to changes
in environmental conditions and the viscosity of the media which you dispense, a recalibration might be
required. You can either recalibrate at regular intervals such as once a week or whenever you notice that the
dispensed volume is different from the volume displayed by the unit.
To fully recalibrate your Zippette Pro follow the procedure below:
1. Set the Zippette Pro to the nominal volume of 30 ml or any other volume which is the most common
volume you dispense.
2. Follow the common rules for calibration used in statistical quality control (ISO 8655-3:2002). Dispense
five full volumes of distilled water at 20 °C to establish the actual mean volume of liquid dispensed. If the
average result varies from the volume displayed, you should recalibrate the Zippette Pro.
3. Using a Cross Head screw driver no.00, slightly undo the cursor's screw and move the cursor up or down
until it aligns with the graduation of the actual volume established in step 2.
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