Metrohm NIRS XDS MasterLab Analyzer - Manual (Page 47)

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When ready, and all interfering items are
removed, click “OK” in this dialog box.
When scanning stationary objects, the “Use
Iris” selection must be clicked. (Stationary
objects need not be moved across the sample
window for averaging.)
When “Use Iris” is selected, any choice of tray is
ignored. (The selections will “gray out” after a
moment.)
Use the Iris Adapter for centering.
Close the aperture around the object to center
it, then open the aperture to avoid reflecting
light back from the aperture itself.
5.8.1 Installation of Iris Adapter
The Iris Adapter is used for round sample cups,
beakers, vials, and other stationary samples.
NOTE: Set the Select Tray dialog box to “Use Iris”.
Align the holes in the Iris Adapter with the pins on
the sample platform, and carefully lower into place.
The pins hold the Iris Adapter securely in position
over the sample window.
Use the adjustment lever to open the iris as needed.