Setting The Volume; Dispensing; Volume Check, Calibration; Volume Check - VITLAB GENIUS Mode D'emploi

8.3. Setting the volume

Loosen the volume selector screw, set the pointer
to the desired volume, and retighten the screw
lightly by hand.

8.4. Dispensing

1. Verify that the closure cap is removed and set
valve switch to "dispensing", if so equipped.
2. Place a suitable vessel below the discharge
tube outlet.
3. Gently lift piston in a slow and steady
motion, then depress piston slowly and
steadily. No bubbles should be visible during
dispensing.
Warning!
If the piston moves stiffy or is difficult to
move, stop dispensing immediately and
clean the instrument (see chap. 9).
4. After dispensing, leave the piston in the
down position. Close the discharge tube
with the closure cap. Set the valve switch to
"recirculation", if so equipped.
Attention!
Reagent may escape from the discharge
tube and the closure cap.

9. Volume Check,

Recalibration
9.1 Volume Check
The procedure is described in detail in
DIN EN ISO 8655/6.
1. Set to nominal volume and dispense distilled
water into a weighing vessel.
2. Weigh the dispensed amount of water with
an analytical balance.
3. Convert the indicated weight into volume
units, taking into account the temperature,
density and atmospheric pressure. (The
conversion factor Z is published in the
standard.)
4. Carry out 10 dispensing procedures.
5. Calculate accuracy and coefficient of
variation.
9.2 Recalibration
After prolonged use, or for specific appplications,
instruments provided with calibration mechanism
(1) can be adjusted by turning the slot of the
mechanism with a coin.
1. Turning in the direction of the arrow
decreases the volume.
2. Turning in the opposite direction of the
arrow increases the volume.
3. Subsequently, check the volume again.
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