Installing the GC 1
Agilent Intuvo 9000 GC Installation 49
Leak test all connections and set source pressures.
Liquid leak detectors, such as soapy water, are not
recommended, especially in areas where cleanliness is very
important. If there is a leak, these liquids can contaminate the
plumbing and affect your analyses. If you do use leak detection
fluid, immediately rinse the fitting to remove the soapy film.
When checking for leaks of hydrogen or helium, Agilent
recommends the G3388B leak detector, or similar.
Perform a pressure drop test.
1 Set the regulator pressure to 415 kPa (60 psi).
2 Fully turn the regulator pressure adjustment knob
counterclockwise to shut the valve.
3 Wait 10 min. If there is a pressure loss greater than 7 kPa
(1 psi), there is a leak in the external connections. Use the
leak detector to check each fitting for leaks.
Correct leaks by tightening the connections. Retest the
connections; continue tightening until all connections are
leak-free.
Set source gas pressures
The pressure set at a tank regulator depends on these factors:
• The inlet pressure needed to achieve the highest column flow
rate required by your method.
The pressure/flow relationship depends on the column or
device involved. The best way to address this is to begin at a
moderate pressure level and adjust upward as needed.
• A pressure difference of about 170 kPa (25 psi) across flow
controlling devices enables them to work properly.
• The pressure limit of the weakest part of the supply system
determines the maximum supply pressure available.
Swagelok fittings and copper tubing are more than adequate
for the highest pressures used in gas chromatography.
We recommend a maximum continuous operating pressure
of 1170 kPa (170 psi) to avoid excessive wear and leaks.
To avoid a potential shock hazard when using liquid detection
fluid, turn the GC off and disconnect the main power cord. Be
careful not to spill leak solution on electrical leads.
To Next Page
Loading...
Need help?
General
