Campbell Scientific TGA200A TGA Series Trace Gas Analzyers - Page 67
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TGA Series Trace Gas Analyzers 7.2.3.1 Laser CAUTION FIGURE 7-7. Expanded view of the menu in the TGA's Settings window Temperature The Settings > Laser > Temperature window is different for TGA Windows and TG TEC. TGA Windows (FIGURE 7-8) supports LN2-cooled lasers that measure temperature in K and have a heater to control their temperature above the LN2 tank temperature. TGA TEC (FIGURE 7-9) supports TEC lasers that measure temperature in °C and have a TE cooler to control their temperature. The laser temperature setpoint should be set and optimized for the individual laser. See Appendix C.1, Laser Temperature, for details on how to set the laser temperature. The laser temperature may also be set from the Laser window (see Section 7.2.4, Laser Window). The maximum laser temperature (K or °C) provides a safety shutdown. If the laser is warmer than this, the TGA will automatically turn the laser current off to protect the laser. This limit should be set for the individual laser. Setting the maximum laser temperature parameter above a laser's safe operation temperature greatly increases the risk of damaging the laser. The parameters on the bottom part of the window should normally be set to the factory defaults, as shown for each type of laser in FIGURE 7-8 and FIGURE 7-9. 53