CETAC ASXPRESS PLUS - If the 6-Port Valve Is in the Wrong Position (Re-Homing); If some Samples Are Missed; If There Are Data Quality Problems; QC Failure

ASXPRESS PLUS Rapid Sample Introduction System Operator’s Manual
Chapter 12: Troubleshooting the Rapid Sample Introduction System
128
If the 6-Port Valve Is In the Wrong Position (Re-
Homing)
It is possible for the 6-port valve to become rotated away from its proper
position. If this happens, follow these steps to re-home the valve:
1 Power down the ASXPRESS PLUS electronics module, unplug any USB cables from
the electronics module, and wait a few seconds.
2 Power up the electronics module and plug in the USB cables.
3 Start the Xpress Configuration Tool and make sure it is communicating with
the electronics module.
4 Expand the GUI using the arrow button on the right side of the window.
5 Repeatedly click Load then Inject to switch the valve between each state.
6 If the valve is out of sync, the switching noise will start out longer, but then get
shorter when the valve is synced up properly.
See also "Replacing or Reorienting the 6-Port Valve" on page 121.
If Some Samples are Missed
If the autosampler skips some of the samples, it is likely that the time required
to execute the ASX
PRESS PLUS macro is greater than the analysis time. The
ASX
PRESS PLUS electronics module does not buffer commands. Therefore, if the
host PC issues autosampler commands too quickly, some of those commands
may be lost.
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. You may need to adjust the
ASX
PRESS PLUS timing parameters, or you may need to adjust timing parameters
in the ICP software.
For a description of each function and parameter, see “Timing Parameters” on
page 99.
If There are Data Quality Problems / QC Failure
1 Verify that the loop is being completely filled.
2 If the loop is not loading correctly, re-home the valve.
3 If problem persists dismantle and clean the 6-port valve and check tubing for
blockages. Replace the tubing if necessary.
4 If the replicate readings have a large RSD value, inspect the peristaltic pump
tubing and replace if necessary.
5 Verify that the nebulizer is free-flowing and misting correctly.