Getting Started
Agilent Vapor Generation Accessory VGA 77 and VGA 77P User’s Guide 21
2 Tighten the clamp, by adjusting the screw, to secure the gas
supply hose to the gas supply. Adjust the pressure at the
regulator to the recommended pressure.
CAUTION
The argon supply pressure supplied to the VGA 77 must be 300 to 400 kPa (43 to
57 psi). The 400–600 kPa (57–88 psi) pressure required to supply argon to the ICP
spectrometer is too high for direct connection to the VGA 77.
TIP
The VGA 77 gas supply may be taken from the main argon gas line to ICP
spectrometers if you use the following precautions:
1 Insert a suitable ‘T’ piece into the main argon gas supply to divert some of the gas to
the VGA 77.
2 Attach a regulator to control the flow of argon to the VGA 77.
3 Place a tap in the argon supply to the VGA 77. The tap is required to shut off the argon
supply to the vapor generator, as gas can flow through the VGA 77 even when it is
switched off.
Within the VGA 77, the inert gas supply is divided into two branches.
The first branch is controlled by a solenoid stop valve. It supplies gas
to the inlet side of the reaction coil. The second branch supplies inert
gas directly through the gas/liquid separator.
NOTE
Inert gas will flow through the separator even with the VGA 77 switched off.
When the VGA 77 is switched on, it will flow through both branches. To reduce
gas consumption when the VGA 77 is not in use, a shut-off valve in the inlet gas
supply is recommended. The gas supply can then be shut-off when the VGA 77 is
switched off.
During operation, the gas supply pressure is automatically monitored
by a built-in sensor. If the gas supply is interrupted, or if the supply
pressure falls below the specified minimum, the blue indicator light
will be illuminated, and the gas supply to the reaction coil is shut off.
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