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Connecting the Gas Supply to the GC
WARNING! Pressure of the supply gas lines should be set to a minimum of 400 kPa (60 psi) to
ensure the regulation of detector gases.
Maximum input pressure to FOCUS GC (from supply gas lines) is 1000 kPa (145 psi).
Note for FID
The FID requires hydrogen and air as fuel gas and nitrogen as make-up gas.
The adjustment of the detector gases flow is done in factory prior shipment.
Verify that the corresponding gases flows are correct. If not, adjust the value
turning the relevant regulation screw as shown in Figure 4-4.
The flow is measured at the exit of the detector base body. Enter the FID detector
control menu to turn the flow on/off.
Note for TCD
The TCD detector requires the same gas whether for the measure channel (carrier
and make-up gas, when necessary) and the reference channel (reference gas)
Site Preparation and Installation Manual
Gas
Hydrogen (fuel gas)
Air (fuel gas)
Nitrogen (make-up gas)
OPEN
1 turn clockwise of the regulation screw increases the flow of about 2.5 mL/min
1 turn counterclockwise of the regulation screw decreases the flow of about 2.5 mL/min
Figure 4-4. FID-External Detector Gases Flow Regulation
Flow
35 mL/min
350 mL/min
30 mL/min
H 2
Make-up
OPEN
Plumbing the Gas Supply to the GC
Air
FID - External Detector
Chapter 4
61
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