Agilent 7820 GC Service
143
Method and Run
Control View:
Instrument>Edit
Parameters>Signal
s
Assign Signal 1 to the detector
Choose Save Data All
Data Rate = 5 Hz
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.
If using a data system, prepare the system to perform one run
using the loaded checkout method. Make sure that the data
system will output a chromatogram.
Start the run.
If performing an injection using an autosampler, start the run
using the data system or press [Start] on the GC.
If performing a manual injection (with or without a data
system):
a Press [Prep Run] to prepare the inlet for splitless
injection.
b When the GC becomes ready, inject 1 µL of the checkout
sample and press [Start] on the GC.
The following chromatogram shows typical results for a new
detector with new consumable parts installed.
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