Metrohm NIRS XDS MasterLab Analyzer - Manual (Page 38)

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To insert the sample tray into the instrument, note
the round guides on the sample carrier. They are
shown in this photo – the pencil points to the one on
the right.
The sample tray must be positioned over these pins
and gently pressed down to the stops. If crooked, the
tray cannot be positioned correctly. Care must be
used in placing the tray on the pins.
The Select Tray Dialog box must have the correct
selection made. Click on “Use Tray” as shown.
This selection activates the x-axis and y-axis
motion. See the section on Vial Dialog Selection
for full details.
The sample transport mechanism is quite rugged, and requires no service by the user.
Please observe these cautions:
• Never attempt to move the mechanism manually. This will cause a “Limit Switch Error” in
Vision. The user must then disconnect, cycle power, and re-connect to the instrument to reset
the mechanism.
• Do not attempt to clean or lubricate the mechanism. The traversing nut is self-lubricating and
self-cleaning, and requires no service of any kind. The lead screw is stainless steel, and needs
no service.
There are no user-serviceable parts in the mechanism. It has been aligned and set for quiet, stable
operation. Please be gentle, and do not attempt to make any adjustments.
5.5 Adjustment for Tablet Height in Tablet Transmission
When using the MasterLab Tablet Analyzer in tablet transmission mode, it is important that the
height of the detector be consistent. (This does not apply in reflectance, where the detector is fixed.)
The height of the detector is set at the factory to be approximately 0.020” above the deck of the
standards tray. The height is locked at this position using a locking screw. The adjustment screw is
then removed, and is packed with the tablet standards set.
The detector height setting will affect the amount of energy striking the transmission detector.
Therefore it is important to keep the setting consistent for a given type of tablet. It is also important
to document that setting, and re-set the instrument to that height whenever returning to that same
type of tablet.
This height is user adjustable for larger or smaller tablets. Resolution of the adjustment is 0.01mm.
Vertical travel of the mechanism is sufficient for all common tablet thicknesses. To change detector
height, follow these steps: