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Chapter 4 Operation
CHANGING THE PATHLENGTH
The SapphIRe analyzer can be set to one of two pathlengths: short (0.5 m) and long (12.5
m). To change the pathlength from the short pathlength (0.5 m) to the long pathlength
(12.5 m), turn the hex recess adjustment clockwise with the pathlength change tool or
9/64 hex wrench. The location of the pathlength adjustment is shown in Figure 4-3. To
change the pathlength from long to short, turn the adjustment counterclockwise. See
Location of Pathlength Adjustment for location of adjustment.
Caution: Do not overturn adjustment.
The rotation angle is approximately 90 degrees but the actual short path position
corresponds to the point at which a push pin engages a notch in a cam. As the pin and
cam are aligned, an indicator rod engages a microswitch which tells the microprocessor
that the gas cell is now at short path.
As the mechanism is being changed from the long to short position, there is a slight
increase in resistance to turning the adjustment. This is normal (caused by the
compression of an internal spring) and should not be construed as a defect. An audible
"click" indicates when the mirror is in the proper position.
Short
Figure 4-3. Location of Pathlength Adjustment and Battery Compartment
Long
4-16
Battery
compartment
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