Getting Started
28 Agilent Vapor Generation Accessory VGA 77 and VGA 77P User’s Guide
4 Connect the inlet end of the middle tube to the black rubber
connector at the top of the reagent manifold marked ‘Acid ->’.
Connect the other end to the black rubber connector near the
middle of the reagent manifold marked ‘Acid <-’.
5 Connect the inlet end of the outer tube to the nipple at the top of
the reagent manifold marked ‘Sample ->’. Connect the other end
to the nipple near the middle of the reagent manifold marked
‘Sample <-’. The nipples have a contoured profile. Ensure the
tube is pushed all the way home and covers all of the contoured
section of the nipple.
6 Swing the rear tube bed against the rear tubes and ensure that:
a The bed bears evenly against the tubes
b The tubes are seated squarely on the pump rollers.
7 Adjust the position of the tubes if necessary.
8 Repeat Step 6 with the front tube bed.
9 Adjust the speed of the peristaltic pump on the ICP spectrometer
to ensure that liquid is being pumped out of the gas/liquid
separator faster than it is being pumped in by the VGA 77.
For best results, try not to overfill the gas liquid separator and
try not to completely empty it.
TIP
If you shorten the ‘tails’ of the pump tubing, you may reduce reagent and sample
volume in the tubing, thereby reducing sample consumption and reducing
pre-read delays.
TIP
The mixing coil is particularly required for mercury analysis. Analysis times for
hydride elements can be reduced by using a shorter length of the mixing coil
tubing. A separate module could be dedicated to this application.
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