Operation
Agilent Vapor Generation Accessory VGA 77 and VGA 77P User’s Guide 45
NOTE
The peristaltic pump will run continuously once the power is switched on.
4 Slacken both pressure adjusting screws. Swing both tube beds
against the pump tubing and close the pressure bar.
5 Slowly tighten the front (sample) pressure adjusting screw until
water is obviously being pumped through the tube. Tighten the
pressure adjusting screw a further half turn. At this setting the
pumping rate will be close to optimum. Any further tightening of
the screw will tend to reduce the pumping rate.
CAUTION
Do not over-tighten the pressure adjusting screws. Excessive tightening will
shorten the life of the pump tubes and could cause permanent damage to the
pump.
NOTE
At this stage, inert gas may be seen bubbling out of both the other tubes. This is
a normal consequence of pressurizing the system and this situation is
automatically corrected when you adjust the pumping pressure in these tubes.
TIP
To see if the liquid is being pumped smoothly, you can deliberately create air
bubbles by dipping the capillary in and out of the container.
6 Repeat Step 5 with the rear pressure adjusting screw.
7 Measure the uptake rate through the sample pump tubes. The
uptake rate should be within the range 6–8 mL/min.
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