ASXPRESS PLUS Rapid Sample Introduction System Operator’s Manual
Chapter 9: Configuring the ASXpress Plus System
100
position, the vacuum pump is turned on and the Loop Load
timer begins. The sample loop is loaded with sample for the
time duration selected.
Equalization
Delay
Time from when the vacuum pump switches off to when the
valve switches. Allows pressure equilibrium to establish and
prevents sample out-gassing.
Stir Delay
For autosamplers with a stirrer: Additional stirring time for the
next sample (with stirrer and probe down and pump off). This
parameter is grayed out if the autosampler personality does
not include a stirrer.
Time to
Evacuate Probe
Time to evacuate the probe side of the sample before moving
to the rinse station. The default time of 1 second works well for
most applications.
Probe Rinse
With the expiration of the Loop Load time, the 6-port valve is
switched to the “inject/rinse” position, the vacuum pump is
turned off, and the sample, which has been loaded into the
loop, is pumped (pushed) to the nebulizer by the ICP/ICP-MS
peristaltic pump. At the same time, the autosampler probe is
moved to the rinse station to be washed and the vacuum
pump is turned on for the amount of time set in the software
for Probe Rinse time.
Rinse Station Fill
With the expiration of the Probe Rinse time, the autosampler
probe is raised and the ASX
PRESS PLUS vacuum pump continues
to run. The autosampler peristaltic pump also continues to run
and fills the rinse station for the amount of time set for Rinse
Station Fill. When this time expires, the autosampler peristaltic
pump and ASX
PRESS PLUS vacuum pump are turned off and the
system waits for a command to move to the next sample.
Pump Timeout
This setting controls how long the vacuum pump (in the
valve/pump module) runs. Set this to a value greater than the
sample analysis time to ensure that sample flow is maintained.
The timer is reset whenever an autosampler command is
issued by the ICP software. The minimum value is 60 seconds.
Rinse Station
Refill
When the probe is returned to the rinse station, the vacuum
pump will pull rinse solution through the probe. This can result
in the rinse station being emptied. Rinse Station Refill specifies
the amount of time to allow the rinse station to refill once the
vacuum pump stops.
In most cases, the timing parameters will have been configured by a CETAC
representative during installation. Make a note of those initial values before
making any changes.
See "Developing a Method" on page 113 for tips on finding the right values for
these parameters.
Always configure timing so that sample times do not overlap. In other words,
make sure the "BUSY" LED on the front of the electronics module has gone out
before sending the next autosampler command.
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