389D001 Rev G
38 of 94
Ultraviolet Lamp Replacement
UV germicidal lamps lose their effectiveness over time and should be replaced when the intensity at the work
surface drops below 40 microwatts per square centimeter at a wavelength of 253.5 x 10
-9
meters.
IMPORTANT
Before replacing a UV germicidal lamp it might be necessary to check with an industrial hygienist,
safety officer or other qualified person in the lab to make sure that there is nothing stored in the
cabinet that could potentially be a hazard to you or could be contaminated by room air.
Step 1:
Raise the viewscreen to its maximum open position. The audible & visible alarm will activate.
Step 2:
Using both hands, grasp the UV lamp carefully near each end and move it approximately
½ inch [13 mm] to the right side of the cabinet until the UV lamp is released from the lamp socket on
the left side. Carefully remove lamp from cabinet and dispose of it properly.
Step 3:
Install a new lamp by doing step #2 in reverse order. Ensure that the lamp is held securely in place.
Step 4:
Lower the viewscreen to full closed. This will cancel the audible alarm and flashing indicator light.
Turn on the UV light momentarily to verify that it comes on.
Immediately turn the UV off again.
Step 5:
Raise the viewscreen to the proper sash opening height.
Summary of Contents for SterilGARD SG404
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