Maintenance 5-4
reading caused by fluid adhering to the tip of the aspirate tubing, a small amount of
surfactant should be added to the water (e.g., Fluorad
â at a 0.01% concentration).
% Coefficient of Variation = (Standard Deviation/Mean) * 100
%CV =
1
1
100
2
2
1
n
n
i
i
n
X
X
X
−
−
ì
í
î
ü
ý
þ
æ
è
ç
ç
ç
ç
ç
ö
ø
÷
÷
÷
÷
÷
=
å
*
% Accuracy =
X
sg
Vol
ected
æ
è
ç
ö
ø
÷
é
ë
ê
ê
ê
ê
ê
ù
û
ú
ú
ú
ú
ú
−
*
exp
100
100
where:
sg = specific gravity of H
2
0 @ 25°C = 0.99707
Vol
expected
= Expected volume to be dispensed
n = number of replicate
X = individual result
X = mean of all results
Replacing Dispense or Reagent Tubing
To replace dispense or reagent tubing, follow these steps:
1 To remove the tubing, use a 5/16" wrench and gently loosen the fittings.
2 Unscrew the fittings and remove the tubing.
3 To install new tubing, insert the fitting into the valve and tighten it finger tight.
4 Using a 5/16" wrench, turn the fitting another ¼ to ½ turn.