Maintaining the Instrument
Changing the Sampling Needle
90
Figure 17. Removing the manifold cover and insulation
3. The sampling needle is located inside the square aluminum block. It is
connected to the sampling valve through a 1/16–inch nickel tube and
hexagonal union.
4. Support the hexagonal union with a 7-mm wrench and remove the nut with
another 7-mm wrench. Then, loosen and remove the hexagonal union. Lift
out the needle.
Loosen
Manifold cover
and insulation
(Sampler cover
removed for clarity)
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