Agilent Technologies 6850 Series II User Information page 70

Table 19. µECD Checkout Conditions (Method ECDCKO)
Rate 2
Final temp 2
Final time 2
Purge time
Purge flow
Detector
Temperature
Anode purge flow (N
Makeup flow (N
Offset
Oven
Initial temp
Initial time
Rate 1
Final temp
Final time
Offset checkout
Display the signal output to determine background offset. A stable offset value
less than 1000 display units (inclusive) is acceptable.
•
•
Released: March 2004
)
2
)
2
If the offset is < 0.5 display units, verify that the electrometer is on. If the
offset is still < 0.5 display units, your detector requires service.
If offset is > 1000 display units, there may be chemical contamination
contributing to the signal. Perform a thermal cleanout (see
cleaning" on page 207
signal, check gas purity. Use higher purity gases and/or install traps.
6850 Series II GC User Information
100°C/min
250°C
0 min
0.75 min
60 mL/min
300°C
60 mL/min
25 ± 2 mL/min
Should be < 1000 display counts
80°C
0 min
15°C/min
180°C
10 min
for details). If bakeout does not give an acceptable
Verifying Performance
µECD Checkout
"Thermal
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