Operation
48 Agilent Vapor Generation Accessory VGA 77 and VGA 77P User’s Guide
NOTE
Some instruments may automatically set a fuel-rich mixture. You should refer to
your spectrometer operation manual for details.
WARNING
Explosion Hazard
With the VGA 77 cell installed, the burner will be lower than usual, and a
standard mixture or a fuel-lean mixture may not ignite readily. To avoid an
explosive accumulation of fuel and oxidant in the sample compartment,
ALWAYS ensure that the gas mixture is fuel-rich before operating the Ignite
button.
3 If a Mark VI burner is fitted, tilt the absorption cell clear of the
burner. (On older instruments this will also ensure that the
igniter arm does not strike the cell.)
CAUTION
If you leave the absorption cell in a fuel-rich flame, carbon particles may be
deposited on the outside wall of the cell. Under these conditions, the cell can be
permanently damaged by local overheating.
4 Ignite the flame and adjust the fuel flow to give a lean flame. If
necessary, lower the cell back to its normal position.
Conditioning the System
The objective of this procedure is to ‘condition’ the complete system
and obtain a stable signal before calibrating the instrument and
analyzing your samples.
This procedure should be carried out:
When the system is first installed
After the system has been completely flushed and cleaned
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