Galvanic Applied Sciences 943-TGS, Operation Manual

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Revision 1 79 6/27/2017
7.3 Changing the UV Source Lamp
The UV Source Lamp requires replacement when either the lamp will not start, or when the
energy output of the lamp has diminished to a point where a peak spectrometer output level
of 20,000 on the spectrum displayed on the
Spectrum
page cannot be achieved, and the
integration time has exceeded the high integration period warning limit (1000 ms).
The UV Source Lamp will not restart for a period of time after it has been shut off as ignition
of a hot lamp can cause serious problems. If the lamp is turned off or is no longer lit, it may
be worthwhile to wait for 15-20 minutes before restarting it. If the lamp does not start after the
cool down period, it should be replaced as described below:
The normal lifespan of a
UV Source Lamp
is about six (6) months but longer life spans are
possible in circumstances where the restart count is low.
The lamp life is inversely proportional to the number of restarts on a
particular lamp and the lamp should not be turned off and on often.
An iris is installed on the lamp holder between the lamp and the fluid holder. The iris is preset
at the factory with clean optics and a new lamp to obtain 32,000 counts at a <100 ms
integration period. The setting of the iris is only to be changed in extreme situations.
To change the
UV Source Lamp:
a) Place the analyzer in the Offline mode by accessing the Online button on the Analysis 1
page of the analyzer display. Press the Enter key to toggle the green Online button to
red “Offline”.
b) Place the analyzer in back purge mode. This can be done by navigating to the Back
Purge field on the Analysis 1 page and pressing Enter to place an “x” in the box.