7820A GC Site Preparation 1
7820A GC Site Preparation Guide 17
Gas Supply
Supply instrument gases using tanks, an internal distribution
system, or gas generators. If used, tanks require two-stage
pressure regulators with packless, stainless steel diaphragms.
The instrument requires 1/8-inch Swagelok connections to its
gas supplies. See Figure 2. Plumb the gas supply
tubing/regulators so that one 1/8-inch Swagelok female
connector is available for each gas needed at the GC.
Table 10 lists minimum and maximum delivery pressures for
inlets and detectors, measured at the bulkhead fittings on the
back of the instrument.
Figure 2 Example Swagelok connector and hardware
Table 10 Delivery pressures required at the GC, in kPa (psig)
Detector type Inlet type
FID NPD TCD uECD Split/Splitless Purged
packed
Hydrogen 240–690
(35–100)
240–690
(35–100)
Air 380–690
(55–100)
380–690
(55–100)
Makeup 380–690
(55–100)
380–690
(55–100)
380–690
(55–100)
380–690
(55–100)
Reference 380–690
(55–100)
Swagelok nut and ferrules
Female Swagelok fitting on GC
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