20
SECTION 2, continued
Figure 6 Installing the COD/TNT Adapter
2.6 Using the Instrument Cap as A Light Shield
The colorimeter cap is removable (by sliding it away from the
keypad) to expose the sample cell compartment. The instrument
cap also functions as a light shield. Samples may be analyzed
without the light shield in place but using the light shield provides
a good seal against stray light and contributes to more accurate
results. Use of the light shield is especially important when
performing an analysis in bright light or direct sunlight.
To use the instrument cover as a light shield during
measurements, place the cap over the sample cell, into the
grooved marks on the instrument. See Figure 7.
Figure 7 Installing the Light Shield
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