3-10 Maintaining the Autosampler
Pairing air needles with titer plates or vials
Consider the following dimensions when choosing an air needle:
On the basis of protrusion length, choose the most suitable air needle.
• Height of the titer plate, in mm (Ht)
• Well depth, in mm (Dw)
• Thickness of capmat or seal, in mm
(Cd)
• Set needle height, in mm (Nh)
• Distance of the air needle point
through the capmat or seal in mm,
minimum 2 mm (Ac)
Ht – Dw must be between 2 and 6 mm,
at which value you can calculate the
protrusion length of the sample
needle—the distance between the point
of the sample needle and the point of
the air needle—as Ht – Cd – Nh – Ac.
Air needle type Protrusion length from Protrusion length to
50 mm, yellow 34 40
56 mm, red 28 34
62 mm, white
(standard needle)
22 28
68 mm, blue 16 22
74 mm, green 10 16
80 mm, black 4 10
H
t
D
w
C
d
A
c
N
h
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