Agilent Technologies 7694 User manual

This document is believed to be accurate and up-to-date. However, Agilent Technologies, Inc. cannot assume responsibility for the use of this material.
The information contained herein is intended for use by informed individuals who can and must determine its fitness for theirpurpose.
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Changing the Sample Needle
Agilent 7694 Headspace Sampler
Sample probes and union part numbers are:
Nickel needle assembly for G1289 or G1290 301-013-HSP
Silcosteel® needle assembly for G1289 or G1290 301-220-HSP
Nickel needle assembly for G1883 232-2790010-EHS
Silcosteel needle assembly for G1883 232-2790012-EHS
Zero dead volume union for G1290/G1289 325-045-HSP
Union elbow for G1883 998-0000053-EHS
The process of changing the sample needle on the 7694A or 7694E Headspace
Sampler is as follows.

Maintaining the Instrument
Changing the Sampling eedle
2
Changing the Sampling eedle
1. Remove the two screws on the sides of the sampler cover shown below
and lift the cover. Support the cover while working in the sampler area.
Figure 16. Removing the sampler cover
2. Loosen the two screws on the manifold cover (it is a stainless steel box)
and insulation from the valve compartment.
Remove screws
Manifold cover
Lift front cover
Rear cover

Maintaining the Instrument
Changing the Sampling eedle
3
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)

Maintaining the Instrument
Changing the Sampling eedle
4
Figure 18. Position of vial sampling needle
5. Replace the sampling needle, tighten the fittings, and perform a leak test
before replacing the insulation and cover.
Hexagonal union Union
Sampling needle
Sampling needle
G1289/G1290 G1883