Introduction to Headspace and to the 7694 Headspace Sampler
Principles of Operation
14
Power on Diagnostics
When the instrument is powered on or reset (see page 30 and page 46), it runs
through a series of checks to make sure it is operating properly. The messages
displayed will vary depending on your model, but will be similar to:
Other messages may appear as well. If your sampler has a tray, the sampler
may move remaining vials from the carousel and display a message such as
RETURNING VIALS or VIALS RETURNED. If you receive other messages,
see “Error Messages” on page 128.
Standby Condition
During standby, the pressurization valve is open, and auxiliary gas flushes the
sample valve, the sample loop, and the sampling needle. Carrier gas is also
flowing to the GC injection port through the sample valve.
WARNING Do not use hydrogen as a gas in the 7694 HS.
G1289 and G1290 G1883
Agilent 7694 or 7694 RESET Agilent 7694E or 7694E RESET
FIRMWARE REV X.Y FIRMWARE REV X.Y
ROM CHECK ROM CHECK OK
RAM CHECK RAM CHECK OK
TRAY RESET CAROUSEL RESET
VIAL TEMP OK VIAL TEMP PROBE OK
LOOP TEMP OK LOOP TEMP PROBE OK
TR.LINE TEMP OK TUBE TEMP PROBE OK
7694 NOT READY 7694E NOT READY
7694 READY 7694E READY
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