Figure 4-5. Tcd Detector Gases Flow Regulation - Thermo Scientific FOCUS GC Site Preparation And Installation Manual

Chapter 4
Plumbing the Gas Supply to the GC
Helium is the recommended carrier gas due to its high thermal conductivity and
chemical inertness.
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 4-5.
The flow is measured at the exit of the detector. Enter the TCD detector control
menu to turn the flow on/off.
62
Gas
Helium (make-up gas)
Helium (reference gas)
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 4-5. TCD Detector Gases Flow Regulation

Flow
27 mL/min
30 mL/min
Make-up
OPEN
Connecting the Gas Supply to the GC
Ref.
TCD Detector
Site Preparation and Installation Manual