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6.
MAINTENANCE AND SERVICE
6.1. Procedure for Lamp Replacement or
07450B DCN6495
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CAUTION – PERSONAL SAFETY HAZARD: UV RADIATION
UV radiation is associated with LED arrays. Never open the photolytic
converter while power is ON.
Over time the light output from the LED's will diminish, thus reducing
the photolytic converter efficiency (CE). This may be caused either by
the lamps having reached their life limit or by contamination building up
on the LED array of the photolytic lamps and on the inside surface of the
Teflon chamber that houses the lamps. The former requires lamp
replacement; the latter requires cleaning.
When the CE falls below 40%, determine the cause by first cleaning the
lamp assembly and then checking the CE again. If the CE is still below
40% when calibrated using a 0-500 ppb range, then replacement of the
lamp assemblies is recommended (KIT 000328). The procedure for either
case involves removing both lamp assemblies, by following steps 1 to 9
below.
Cleaning
For cleaning, use distilled water and a non-abrasive, lint-free cloth.
1. Power OFF the instrument.
2. Remove the setscrew located in the top, center of the Front panel.
3. Remove the top cover of the analyzer.
4. Slide the cover backward until it clears the analyzer's front bezel
5. Lift the cover straight up.
6. Locate the Photolytic Converter assembly (Figure 3-1) and remove
both lamp assemblies as follows:
a. Gently disconnect the electrical connectors (they are delicate)
between the housing and each lamp assembly (Figure 6-1).
b. Remove the four socket head cap screws holding the body of the
converter to the base plate. Remove the Photolytic Converter
assembly from the analyzer.
c. Remove the four screws that secure the lamp assembly at either
end of the housing.
d. Follow either Step i or Step ii next, and then continue to Step 7.
i. For cleaning, wipe the LED array and the interior of the
Teflon chamber.
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