CompactGC manual
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Figure 3.2: Diagram CGM
Programmed pressure, pressure surge
These modes of carrier gas control are obtained by programming the targeted
parameters using the Run Time Table. See chapter 5 for more details.
If the CompactGC runs out of carrier gas (no inlet supply), the system switches to the
Hibernate mode (all flow and temperature channels are set to value 0) and cools
down.
The GC needs a reboot (mains power switch, or ‘warm reset’ from the CGC editor
menu) to return to normal operation.
DGM
The second type of digital gas supply contains two pressure channels, and is therefore
used to control two detector gasses, f.i. hydrogen and air in case of FID, or two
reference gasses in case of double TCD. In combination with a calibrated, temperature
compensated restrictor in the module, constant detector gas flows are obtained. See
figure 3.3. The flows needed for proper detector operation are entered using the CGC
editor program.
