90 1100 Series WS MWS Reference Manual
3 Troubleshooting and Test Functions
Step Commands
Each movement of the sampling sequence can be done under manual control.
This is useful during troubleshooting where close observation of each of the
sampling steps is required to confirm a specific failure mode or verify
successful completion of a repair.
Each step command actually consists of a series of individual commands
which move the sampler components to predefined positions enabling the
specific step to be done.
In the ChemStation the step commands can be selected from the “Test
Selection Box” in the Diagnosis display. In the Control Module the step
commands can be accessed from the pull-down menu in the well-plate sampler
“Test”.
Tabl e 16 Step Commands
Step Action Comments
Bypass Switches injection valve to the bypass
position.
Plunger Home Moves the plunger to the home
position.
Needle Up Lifts the needle arm to the upper
position.
Command also switches the
valve to bypass if it is not
already in that position.
Needle into Vial Lowers the needle into the vial.
Draw Metering device draws the defined
injection volume.
Command lifts the needle, and
lowers the needle into vial.
Command can be done more
than once (maximum draw
volume of 100µl cannot be
exceeded). Use “Plunger
Home” to reset the metering
device.
Needle Up Lifts the needle out of the vial. Command also switches the
valve to bypass if it is not
already in that position.
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