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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