Verifying Performance
FPD Checkout
Released: March 2004 6850 Series II GC User Information page 78 of 256
4. With the flame lit, observe the FPD signal at the display. This is the
flame-on background offset. A stable value < (Flame off + 85) display units
is acceptable.
If the value is < 5 display units, verify that the electrometer is on. If it was
off, recheck the flame-off background offset. If it was already on, your
detector requires service.
Noise, wander and drift
1. Make these settings on the ChemStation:
2. Press Start to make a blank run, then wait until it is finished.
3. Select View/Data Analysis. Load the data file for the blank run just
completed.
4. Select Report/ Specify Report. Choose printer and screen.
5. Select Integration/ Integrate.
6. After integration is completed, Select Report/Print Report. The
report will list measurements for noise (peak to peak, % standard
deviation, and ASTM) and for drift and wander.
7. Base signal should be:
Flame off ≤ 40 display units
Flame on ≤ Flame off + 85 display units
8. ASTM noise should be < 5 display units.
9. Wander (for a 2-minute time window) should be < 2.5 display units.
Path Setting
View Full Menu
View/Data Analysis/Report/Specify Report Performance + noise, OK
System Suitability, Edit Noise Ranges, enter sev-
eral ranges that >1.01 min plus one at 5 min,
OK
View/Method/Save Method As Supply name
Instrument menu/Edit Parameters Oven, initial temp 60°C
Initial time = 12 min, Rate 1 = 0°C/min, OK
View/Run Control/Sample Information Enter directory and file names, close window
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