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Heated zones
Vial tray
Sampling system
Transfer line
User Information
Introduction to Headspace and to the G1888 Network Headspace Sampler
There are three heated zones. They are the vial oven, the loop,
and the transfer line. Each heated zone can be set to a specific
temperature or turned off.
The vial oven is where the vials heat during thermal and
chemical stabilization. The setpoint temperature range is
between 40 °C and 230 °C. At this point, the needle has not
pierced the septum.
The loop zone controls the temperature of the upper chamber,
the valve, and the sample loop. The setpoint range of the loop is
between 45 and 250 °C. Keep the loop temperature 10 to 15 °C
higher than the vial temperature for most operations.
The temperature range of the transfer line is 50 to 250 °C.
The 70-sample vial tray is located on top of the unit to the left of
the oven. The tray is constructed of a flexible belt with dividers
for each vial compartment. The keypad on the front of the
Headspace Sampler controls tray rotation to assist filling the
tray with headspace vials. The tray can move forward and
backward.
The basic components include a deactivated stainless steel
vial–sampling probe with an inner diameter of 0.5 mm, six–port
valve, deactivated stainless steel valve sample loop, set of two
miniature solenoid valves, and deactivated stainless steel
tubing.
This line connects the Headspace Sampler to the GC. The
transfer line is 85 cm long and made of deactivated stainless
steel. The transfer line heats to a maximum temperature of
250 °C. There is a removable needle for easy interfacing through
GC inlet septa.
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