thermo spectronic Helios Gamma Benutzerhandbuch Seite 58

REMOVAL AND REPLACEMENT OF TUNGSTEN HALOGEN LAMP
WARNING: Switch off and disconnect the spectrophotometer from the
mains and allow the lamp to cool for at least 15 minutes
before proceeding.
Remove the back corner cover by turning the fastener one quarter turn anti-
clockwise and slide the cover up to remove.
Now remove vertically upwards the metal lamp cover.
If fitted, remove the spring clip
Hold the W lamp and pull upwards to remove.
When fitting the new tungsten halogen lamp, avoid handling the silica envelope.
Finger marks become burnt on and cannot be removed after the lamp is switched
on. As this can affect the output characteristics, handle only the base of the lamp.
If the silica envelope does become contaminated, clean with a powerful degreasing
solvent such as absolute alcohol before the lamp is switched on.
Use the new lamp's protective sleeve, a polythene bag or a piece of tissue paper
wrapped around the lamp and insert the pins into the socket.
Replace the spring clip.
These lamps are manufactured to very high tolerances, but to ensure optimum
energy throughput, align the lamp filament exactly as shown in the diagram, with
the white line on the lamp base facing towards the front of the instrument.
Refit both the metal and rear covers.
Reconnect the spectrophotometer to the mains supply and switch on.
Lamp hours and energy must be reset from the controlling software.
GD Issue 1a (12/2000)
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MAINTENANCE
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Protective Sleeve
Silica Envelope
Lamp Base
Spring Clip
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