Setting Up The Module; Connecting The Purge Line - Thermo Scientific NICOLET FT-IR User Manual

Setting up the module

Connecting the purge line

10 Thermo Fisher Scientific
A carrier gas continuously sweeps evolved gases from the furnace
tube chamber. The carrier gas may be inert, such as nitrogen, or
oxidative, such as air. As the compounds in the sample vaporize, the
carrier gas carries them through a heated transfer line and flow cell.
Here the gases are scanned by the infrared beam and the spectral
data is recorded. The gases exit the flow cell through the outlet tube
and should be vented to a fume hood or trap.
The TGA-IR Module is intended for use at ambient pressure, with
low pressure (5 psi or less) carrier gases flowing at a rate of
150 ml/minute or less. An aspirator is recommended to draw out the
exhaust gases. If you use and aspirator, set it for 10 inches Hg or
less. Operating outside these parameters could expose you to burn
hazards when heated gases vent unexpectedly.
After your TGA-IR Module has been installed by one of our service
representatives, you should perform the following procedures to set
up the module to collect data:
• Connect the purge line.
• Connect the transfer and exhaust gas lines.
• Set the temperature.
If you are going to purge your TGA-IR Module, read the notes and
warnings below, and then use the procedure that follows to connect
the purge line (if it is not already connected).
Note You should use the same purge gas that you use for your
spectrometer. We recommend using dry air supplied by a purge gas
generator (or pure air generator) or nitrogen.
Note For more information about setting up the purge system and
controls, see the on-line Spectrometer Help Topics available through
the Help menu in OMNIC. Find "purge" in the index and make a
selection from the list of topics for that entry.