Maintenance
b. Turn the desiccant cartridge upside down and peel the old humidity indicator off the window.
Discard the used indicator.
NOTICE
Always wear lab gloves or finger cots, or use laboratory tissue, when handling a new
humidity indicator. Oil or moisture from skin can discolor the indicator.
6. Install the new desiccant canisters.
a. Open the sealed packet that contains the new desiccant (must be sealed to maintain the
desiccant) and remove the new humidity indicator.
b. Turn the desiccant cartridge upside down and press the blue indicator onto the window so that
the flat edges of the indicator are aligned with the edges of the cartridge. The text should be
visible through the window when you turn the cartridge right side up.
NOTICE
Make sure that the indicator is pressed tightly against the window so that it does not come
loose in the desiccant compartment when you reinstall the cartridge.
c. Insert the canisters into the channel of the desiccant cartridge and tighten the eight screws
(approximately 2 turns) until they are flush with the cartridge channel.
7. Insert the desiccant cartridge.
a. Remove the new O-ring from the packet and install it on the instrument base plate.
Press, rather than roll, the new O-ring into place to be sure it is properly seated in the groove.
b. Insert the desiccant cartridge into the spectrometer so that the text on the humidity indicator
can be read by someone standing in front of the instrument.
Make sure the cartridge is seated properly over the O-ring and then use the #2 Phillips head
screwdriver to tighten the two captive screws.
8. Replace the instrument cover.
a. Carefully set the cover in position on the instrument base.
b. Tilt the instrument onto its back, resting on the heat fins.
c. Insert the four screws that you removed previsously. Tighten all screws.
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Nicolet Summit OA Spectrometer User Guide
Thermo Scientific
