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6
UV STABILITY CHECK - QL
Objective:
To verify the instrument stability for UV measurements with the optional BA-C126 UV Stability Kit.
The stability kit contains five 50W quartz envelope UV lamps.
Recommended Frequency of Check:
Approximately once every two weeks.
Limitation:
The UV calibration check procedure assumes KIPP & ZONEN 'S portable UV lamp assembly, BA-
C126, is to be used. This assembly is intended for monitoring instrument stability and NOT to give
an absolute responsivity calibration. It is recommended that a NIST traceable 1000W lamp
operated at 50 cm distance from the PTFE diffuser be used for absolute calibration.
Lamp Set-up:
1.
Ensure the UV Dome is clean. This may be achieved by using a lint free soft cloth or tissue
(Kim Wipes), and clean water, or a mild cleaner.(Windex, isopropyl alcohol, distilled water).
2.
When facing the front of the Brewer, position the Lamp Housing on top of the UV quartz
dome with the nylon legs snug up against the left edge of the Brewer cover. Slide the lamp
housing left and the nylon legs right and tighten the legs to ensure lateral repeatability.
3.
Select the lamp to be tested. Note the three digit serial number. Vertical repeatability is
achieved by positioning the lamp filament on exactly the same axis as that defined by the
two sight holes on each side of the lamp shield. This axis represents 5cm from the PTFE
diffuser. Verify that the hole in the filament coil is centered by looking through the two holes
in the lamp assembly. If the coil is visible between the two holes, it needs to be adjusted.
The lamp centering can be adjusted if necessary by pushing it slightly to one side or the
other.
DO NOT touch the lamps with your fingers or allow them to come into contact with any wet
or dirty materials. This will reduce the life of the lamp.
4.
Remove the rectangular lamp cover located on top of the lamp housing by unscrewing the
nylon thumbscrew. Insert the lamp into the 6 pin socket, ensuring that it is seated completely
into the socket. The aluminium shield around the lamp is keyed with the housing to keep the
lamp right side up.
5.
Place the UV test case on top of the Brewer. Connect the meter. Connect and latch the lamp
supply cable, and plug the AC cord into the power outlet under the Tracker. Turn the lamp
power supply on.
CAUTION! These lamps emit UV radiation which can be harmful to your eyes. Always
ensure the lamp cover is in place before turning the power on.
MKIII OPERATOR'S MANUAL
6. UV STABILITY CHECK - QL
57
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