Introduction to Headspace and to the 7694 Headspace Sampler
The 7694 Headspace Sampler
10
Sampling System
The basic components include a 316–stainless–steel single–hole (side port)
concentric vial–sampling needle or probe with an internal diameter of 0.5 mm,
316–SS six–port valve, nickel valve sample loop, set of two miniature solenoid
valves, and nickel tubing. You can program the system’s temperature up to
200°C.
Also available is a fused silica-lined stainless steel sampling path (Accessory
G1286A).
Transfer Line
This line connects the headspace sampler with the GC. Two types are
available: standard nickel and fused silica–lined stainless steel. The line is
heated to a maximum temperature of 220°C. There is a removable needle for
easy interfacing through GC inlet septa.
Table 1. Transfer Lines
Keypad and Display
The headspace sampler has a 25–key elastomeric keypad. The display is a
single–line 20–character LED dot matrix design. All functions of the sampler
are controlled from the keypad with the exception of EPC, which is controlled
from the GC or ChemStation.
Material Length, cm Part Number Comment
Nickel 68 301–011–HSP
Nickel 82 301–152–HSP Standard transfer line
Fused silica-lined
stainless steel
82 301–211–HSP For applications requiring a
highly inert non–metal flow
path
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