17 Chromatographic Checkoutï€
246 Operation Manual
6 Display the signal output. A stable output at any value between 12.5 and 750 µV (inclusive)
is acceptable.
• If the baseline output is < 0.5 display units (< 12.5 µV), verify that the detector filament is
on. If the offset is still < 0.5 display units (< 12.5 µV), your detector requires service.
• If baseline output is > 30 display units (> 750 µV), there may be chemical contamination
contributing to the signal. Bakeout the TCD. If repeated cleanings do not give an
acceptable signal, check gas purity. Use higher purity gases and/or install traps.
Oven
Initial temp 75 °C
Initial time 0.5 min
Rate 1 20 °C/min
Final temp 190 °C
Final time 6.25 min
ALS settings (if installed)
Sample washes 2
Sample pumps 6
Sample wash volume 8 (maximum)
Injection volume 1 µL
Syringe size 10 µL
Solvent A pre washes 2
Solvent A post washes 2
Solvent A wash volume 8
Solvent B pre washes 0
Solvent B post washes 0
Solvent B wash volume 0
Injection mode (7693A) Normal
Airgap Volume (7693A) 0.20
Viscosity delay 0
Inject Dispense Speed (7693A) 6000
PreInjection dwell 0
PostInjection dwell 0
Manual injection
Injection volume 1 µL
Data system
Data rate 5 Hz
Table 43 TCD Checkout Conditions (continued)
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