PerkinElmer CLARUS 590 GC, User Manual

Page: 134 / 284

134 . Clarus 590 GC User’s Guide
The make-up gas control valve consists of an outer ring (used to turn the make-up gas completely off or
on), a protective cap, and an inner needle valve (used to adjust the flow of make-up gas). Removing the
cap exposes the needle valve adjustment screw. To set flow, use a small thin screwdriver (P/N 09907273),
supplied in the shipping kit) to turn the adjustment screw. Turn the screwdriver counterclockwise to
increase the flow or clockwise to decrease the flow.
You should only adjust make-up gas flow after a column has been installed and the carrier gas flow or
pressure has been set to the value required for the analysis.
Make-up gas need not be added when using packed columns, where the carrier gas flow is 30 mL/min or
higher.
To adjust the make-up gas:
1. Turn the outer ring of the make-up valve fully clockwise.
2. From the System Status window touch Tools . From the Tools drop down menu touch Utilities .
3. In the Utilities screen touch Stopwatch icon.
4. Measure the flow rate. For best accuracy, use a soap bubble flowmeter volume that gives a reading
of at least 30 seconds.