LabCo 550.001.305, Руководство пользователя

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14
Calculations (for the nominal volume)
Mean value
̅
∑
,
x
i
= results of weightings
n = number of weightings
Mean volume
̅ ̅
,
Z = correction factor
(e. g. 1.0029 μl/mg at 20 °C, 1013 hPa)
Accuracy Standard deviation
̅
V
0
= nominal volume
√
∑
̅
Coefficient of variation
̅
11. Trouble Shooting
Problem Possible cause Corrective action
Piston difficult to
move - Formation of
crystals, dirty - Stop dispensing immediately. Loose
piston by circular motion, but do not
disassemble. Follow all cleaning
instructions.
Filling not
possible - Volume adjusted to
minimum setting
- Sticking filling valve
- Set to required volume.
- Clean the filling valve. If necessary
replace the valve with sealing washer.
Instrument does
not dispense
liquid - Discharge tube
closure cap pushed
on
- Discharge tube not
firmly connected or
damaged
- Remove closure cap.
- Push on the closure cap. Hold the
piston in place, and push the original
manufacturer‘s discharge tube on
firmly. Replace a deformed or damaged
discharge tube.
Air bubbles in the
instrument - Reagent with high
vapor pressure has
been drawn in too
quickly - Slowly draw in reagent.