Introduction to Headspace and to the 7694 Headspace Sampler
Principles of Operation
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Principles of Operation
General Operation
When the instrument is switched on, the sampler moves the first vial into
position. (For models with a tray, the vial tray moves to the start position,
placing the vial located in position one next to the robotic arm. For models
without a tray (G1883), the carousel moves vial one to the start position.) The
oven, sample loop, and transfer line begin heating to reach the setpoint values.
Until the oven, sample loop, and transfer line setpoints are reached, the display
reads 7694 Not Ready and the red “Not Ready” light is lit. If you press Start/
Stop before the machine is ready, the display reads Waiting for Ready
and the “Not Ready” light flashes. When setpoints are reached, the display
changes to 7694 Ready and the “Not Ready” light goes out.
During normal operation, when a run is in progress, the “Not Ready” light may
light, depending on the values specified for the GC Cycle Time and the Vial
Equil Time. When the “Not Ready” light goes on during a run, it simply means
that the headspace sampler is not ready to insert the next vial into the oven
because of timing restraints to maintain constant heating time.
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