7820A GC Installation Guide
7820A GC Installation Manual 11
2 Select the pre-swaged gas tubing for your GC. See
Figure 3.
• Use the tubing with 4 connectors for a GC with TCD.
(The tubing with 3 connectors is not used for
instrument checkout, but may be useful for a GC with
NPD, FID, or FPD after you have performed the
checkout test. The tubing with 4 connectors can be
used for uECD after checkout, if using nitrogen carrier,
anode purge, and makeup.)
Figure 2 Trap installation
Indicating oxygen trap
(recommended)
Big Universal Trap
Carrier gas supply
Optional shutoff valve
OUTLET
To GC
To gas
supply
Big Universal Trap
To GC
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