Checking the purge
Skip this section if you purchased
the “Sealed and Desiccated” option.
If your spectrometer is purged but you don’t have the Smart Purge
option, make sure the pressure regulator is set between 20 and
40 pounds per square inch (psi) and the flowmeter reads
approximately 30 standard cubic feet per hour (scfh). The settings for
systems equipped with Smart Purge are given in the next section; read
this section first.
If you need to adjust the flow rate, or if your application requires a
different flow rate, follow the instructions in “Setting the purge gas
controls” in the “Setting up experiments” book in Spectrometer Help
Topics.
Warning
Never
use a flammable gas to purge the spectrometer. The purge gas
must be free of moisture, oil, carbon dioxide and other reactive or
infrared-absorbing materials. Use dried air or nitrogen to purge the
spectrometer. Other gases, even inert gases such as argon, can
damage the spectrometer and should never be used for this purpose.
S
50
40
30
20
10
SCFH AIR
80
100
120
140
160
0
20
40
60
We recommend that you leave the purge on at all times. This keeps the
spectrometer free of undesirable gases, protects the optics and
improves the system’s thermal stability.
Nicolet FT-IR User’s Guide 15
