EL3000
CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
183
Limas23 – Replacing the UV lamp (EDL)
When should the UV lamp be replaced?
The UV lamp must be cleaned when the display of measured
values has become unstable (drift or disruption) and the analysis
of the intensity display (see
page 179) has shown that the emission intensity of the UV lamp
has become too small.
Note
In the UV lamp (EDL = Electrodeless Discharge Lamp =
electrodeless discharge lamp), the filling gas is emitted in the
plasma discharge over a period of about 2 to 3 years, thereby
decreasing the emission intensity.
Determining UV lamp service life
The operation time of the UV lamp is shown in the following
menus:
‘
Maintenance /
Diagnosis /
Device status /
Analyzer status /
Limas Intensity“
or
‘
Maintenance /
Diagnosis /
Device info’
Overview of the work to be carried out:
• Replacing the UV lamp:
– Remove the old lamp,
– Install the new lamp,
– Recommission the gas analyzer.
• Configure and calibrate the gas analyzer.
– Enter the serial number of the new lamp,
– Adjust the zero point of the electronic SO
2
cross-
sensitivity correction if necessary,
– Intensity standardization.
• Other calibration activities (recommended):
– Check the sensitivity of all measured components,
– Check the linearity of the SO
2
sample component,
– Check the installed calibration cells.
Required are:
• Cross recess screwdriver PZ 2
• Hexagon socket wrench 2.5 mm
• Hexagon socket wrench 3 mm
• Allen key 4 mm
• Slot wrench 8 mm
• Open-end wrench or ring wrench 8 mm
Replacing the UV lamp – Remove the old lamp
1. Disconnect the supply of sample gas to the gas analyzer!
2. Switch off the gas analyzer power supply!
3. Open the door of the wall housing (hexagon socket 4 mm) or
remove the cover of the 19” housing (cross recess PZ 2).
Remove light protection hood
CAUTION
Risk of burns
Risk of burns due to the hot lamp and sample cell
(approx. 55 to 60 °C).
• Before working on the lamp and sample cell, allow the
components to cool.
Figure 96: Removing the light protection hood
4. Loosen 2 fixing screws
2
(hexagon socket 3 mm) and lift out
the light protection hood
1
.
