SC-3 Autosampler Alignment

SC-3 Autosampler Alignment

Pre-Checks

1. Looking down on the autosampler head, there are two screws that go through metal springs 
and attach to the cap.  Ensure that they are snug, but do not strip them.

2. Run a few tests sample runs to see if there is a consistent pattern of the bubbler 
missing to the right/left of the tube.

Adjustment

1) Power the SC off.  Remove the bubbler.  It is ok to leave the RA powered on.

2) Remove the screws holding the back panel in place on the SC-3.

3) Gently remove the back panel


NOTE: The panel will pull away, however there will be some wires holding the plug to the main 
body. Do NOT remove the wires or pull on this too hard.  Gently set the back panel on its back to 
expose the inside.

4) Click the SC to ‘ON’. It will begin to run through its startup sequence.  When it lowers the
head down and reaches the bottom, it will pause.  At the pause, BEFORE it raises up, click 
the SC ‘OFF’.  This will position it in the best place to access the sensor.  If you miss this step, restart the sequence and stop it on the next run.

5) You can now rotate the head out manually.  Gently push the arm to where the head would be 
over the samples.

6) You’ll notice a small metal shim (photo below) that rotates outward as you move the head 
outward.  This controls the “starting” position relative to the arm.



7) LOOSEN, but do not remove, the two screws that hold the shim in place, and move 
the shim SLIGHTLY toward you.  This will alter the starting position.  Power on the SC and 
check the new position and its alignment.  Run a blank tube on position 1 and position 40 
to ensure accuracy for the whole table.  Move the shim toward or away from you to adjust it by 
trial and error to get the most precise position.  For this shim, slight adjustments are all that is 
necessary.  When the shim is in the optimal position, set the screws, replace the back cover, 
and resume operations.  Contact our Service Department with questions or issues.

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