The Keypad
Keys and Their Functions
32
temperature 15°C higher than the oven, and set the transfer line 25°C
higher than the oven.
• To set the oven temperature at 40°C, set the loop temperature at 40°C. The
minimum oven temperature is approximately 15°C above ambient.
Caution Oven temperature should not exceed 10°C below the boiling point of any
solvents in the vial. Exceeding this may cause the cap and septum to leak or to
pop off; the vial pressure line could also become contaminated.
Event Times
Pressing Event Times brings up the first menu item:
Setpoint
GC CYCLE TIME
The cursor keys allow scrolling through the list of events. They are the
following:
GC CYCLE TIME
The time required for the entire GC run to be completed. It is the sum of the GC
run time and GC equilibration time (read from the GC front panel) and an
estimate of the cool–down time required (if any). This time allows the 7694
Headspace Sampler microprocessor to introduce samples into the oven most
efficiently and avoid injecting a sample before the GC is ready. The allowed
Event
Allowed Setpoint Range
(min. increments)
Default Value
(min.)
GC CYCLE TIME
1.0–999.9 in 0.1 25
VIAL EQ. TIME
0–999.9 in 0.1 15
PRESSURIZ TIME
0–99.99 in 0.01 0.20
LOOP FILL TIME
0–99.99 in 0.01 0.20
LOOP EQ TIME
0–99.99 in 0.01 0.05
INJECT TIME
0–99.99 in 0.01 1.00
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