Replacing The Gas Cell Heater - Thermo Scientific Omni FTIR Multi Gas CEMS Instruction Manual

Replacing the
Gas Cell Heater
Thermo Fisher Scientific
Note that the gas cell is aligned by the manufacturer before being delivered
to customers. For field service, an alignment check is needed if there is any
uncertainty of the pass length setting. Once shining the visible laser into
the gas cell through the input window, the pattern shown in
a clear indication of the correct pass setting.
13. Following the gas cell alignment check, it is necessary to perform gas
cell fine alignment at the system operation temperature, 185 °C. Re-
install the gas cell casing and back plate (fitting plate) by following
steps 4 and 2 in reverse order. Re-connect the pressure sensor,
temperature sensor, heated lines, ground wire and heater connections
that were left disconnected earlier. Refer to "replacing the gas cell"
earlier in this chapter for more information. Turn the Temperature
Control circuit breaker on and allow the system to come up to
temperature.
CAUTION High surface temperatures present. Allow sufficient time to
cool. ▲
14. For the fine alignment adjustment, only the input vertical and
horizontal screws in
IR light intensity (Max) in
remove the fitting caps to access the adjustment screws. The final step
of the gas cell alignment is to run "Omnic" software, click "Collect" tab
to open "experiment setup" windows. Click tab "Diagnostic" shown in
Figure 5–41, and then click button "align...". After the software
alignment is finished, click "cancel" button to complete the gas cell
alignment.
15. Re-install the cover on the coupling optics compartment. Use the
Phillips screwdriver to install the 20 mounting screws to complete the
procedure.
Use the following procedure to replace the FTIR gas cell heater.
Equipment Required:
Wrench, 9/16-inch, 7/16-inch, and 3/4-inch
Hex wrench, 5/32-inch and 7/64-inch
Phillips screwdriver
Razor blade/utility knife
Preventive Maintenance and Servicing
Figure 5–39 need to be adjusted to maximize the
Figure 5–41. Use the 9/16-inch wrench to
Omni FTIR Multi Gas CEMS Instruction Manual

Replacing the Gas Cell Heater

Figure 5–40 is
5-51