Agilent Technologies 6850 Series II User Information page 58

Table 17. TCD Checkout Conditions (Method TCDCKO) (Continued)
Oven
Initial temp
Initial time
Rate 1
Final temp
Final time
Rate 2
Final temp
Final time
Offset checkout
Display the signal output to determine background offset. A stable offset at any
value between 0.5 and 30 display units (inclusive) is acceptable.
•
•
Noise, wander and drift
1.
Path
View
View/Data Analysis/Report/Specify Report
View/Method/Save Method As
Instrument Menu/Edit Parameters
View/Run Control/Sample Information
2.
Released: March 2004
If the offset is < 0.5 display units, verify that the detector filament is on. If
the offset is still < 0.5 display units, your detector requires service.
If offset is > 30 display units, there may be chemical contamination con-
tributing to the signal. Perform a thermal cleanout (see
(bakeout)" on page 185
acceptable signal, check gas purity. Use higher purity gases and/or install
traps.
Make these settings on the ChemStation:
Press Start to make a blank run and wait until it is finished.
6850 Series II GC User Information
40°C
0 min
25°C/min
90°C
0 min
15°C/min
170°C
2 min
for details). If repeated cleanings do not give an
Setting
Full menu
Performance + noise, OK
System Suitability, Edit Noise Ranges, enter sev-
eral ranges that >1.01 min plus one at
5 minutes, OK
Method name
Oven, verify oven temp = 40°C
Initial time = 12 min, Rate 1 = 0°C/min, OK
Enter directory and file names
Verifying Performance
TCD Checkout
"Thermal cleaning
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