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Bruker Optik GmbH IFS 125M User Manual
Operation 5
5.9.2 Cooling procedure
1 Remove the protective cap from the 2 detec-
tor hoods.
2 Insert the supplied funnel into the detector fill-
ing port and slowly fill in liquid nitrogen. At the
beginning the liquid nitrogen will evaporate
and escape.
Filling cold nitrogen into warm container:
Nitrogen boils and splashes. Risk of frost-
bites.
➣ Fill in nitrogen slowly into the container.
➣ Keep away from boiling and splashing
nitrogen, and its escaping gases.
3 • Wait until the funnel is empty before refilling. If the liquid nitrogen does not
escape any more, the dewar has cooled down to the liquid nitrogen tem
-
perature.
• Fill the funnel again with liquid nitrogen. Avoid spilling the liquid on the
spectrometer housing.
• Repeat this procedure until the detector dewar has been filled to maximum.
i As a rule of thumb for the standard MCT detector: the maximum dewar
capacity is about the quantity of 3 funnel fillings. Note that the first 3 funnel
fillings will evaporate almost completely. Avoid overfilling as the liquid
would then flow out of the filling port.
4
• Remove the funnel and put on the protective cap again.
• Wait about 15 minutes before starting the measurement to allow the detec-
tor to stabilize.
• Check whether a signal is detected and the optics works properly. More
details are described in chapter
5.6.
Table 5.8: Cooling detector
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