Introduction
Electrical connections
Released: March 2004 6850 Series II GC User Information page 17 of 256
• Actuator gas—Valves or other devices may require a gas to drive them,
usually compressed air. There is no high purity requirement for this gas.
Since the supply pressure may experience surges as the device operates,
the actuator gas must come from a different source than FID Air.
• FID H
2
—The fuel gas for the flame ionization detector (FID)
• Ref/makeup gas—For an FID or a thermal conductivity detector (TCD),
the makeup gas. For a TCD, this is also the reference gas. The reference/
makeup gas must be the same as the carrier gas, and can be taken from the
same source.
• FID air—Supports combustion in the detector and must be separate from
the actuator gas, if air is used there
• Carrier gas—The gas that moves the sample through the column
Electrical connections
Figure 3. Electrical connections
Matching cables
User supplied
Auto injector (not shown)
Reserved
LAN
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