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Note
You should leave the purge on at all times. This keeps the module
free of undesirable gases, protects the optics and improves the
system's thermal stability.
Important
Do not purge with argon. Purging with argon will cause the laser to
fail.
Important
To prevent the cell from becoming contaminated, do not turn on the
cell or transfer line heaters unless purge gas is flowing through
them.
Warning
Never use a flammable gas to purge the TGA-IR Module. The purge
gas must be free of moisture, oil, carbon dioxide and other reactive
or infrared-absorbing materials.
To connect the purge line:
1. Prepare a purge line and connect it to the purge connector on
the rear panel of the module.
For more information about rear panel connectors, see "Rear
panel" in the "Introduction" chapter.
2. Adjust the purge gas supply pressure and flow rate to match
the pressure and flow rate used to purge the spectrometer.
Typically this is between 20 and 40 psi and 25 scfh. Use a
flowmeter to measure the purge flow rate.
3. Adjust the temperature.
See "Setting the temperature" in this chapter for information
about adjusting the temperature. A temperature of 220°C is
adequate for most TGA-IR applications.
TGA-IR Module User's Guide
11
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