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When in the sample analysis mode, the TumblIR pathlength is
100 micrometers, an optimal pathlength for mid-IR analysis of
lubrication samples. The alignment of the accessory is pre-set at the
factory and so there is no adjustment required.
The steps involved with analyzing a lube sample with the 5500t FTIR
are:
1
2
3
Cleaning the TumblIR accessory
To clean the TumblIR accessory:
1
2
Only use soft cotton cloth, such as found on cotton swabs or a suitable
NOTE
substitute to clean the optical sensor and sampling area.
The windows are made of an IR-transmitting material called zinc selenide (ZnSe).
CAUTION
ZnSe is a relatively durable material, but can be easily scratched or damaged if
too much pressure is applied during cleaning or if an abrasive material is used,
such as Kimwipes. Materials such as cotton swabs dipped in acetone are
recommended for cleaning.
ZnSe is relatively chemically-resistant to materials with a pH range between 4
CAUTION
and 9, but there are some materials, such as strong acids or heavily basic
materials, that can harm ZnSe. Avoid having materials in contact with the ZnSe
window that are outside of this recommended pH range.
Agilent 5500 Series FTIR Operation Manual
Clean the sample windows.
Collect a background spectrum.
Collect a sample spectrum.
Rotate the TumblIR arm so the optical sensor is pointing upward.
Clean the top window first, then clean the bottom mounting
window, indicated in Figure 4.
Analyzing Samples
25
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