180 EL3000 CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
… 13 Maintenance
… Limas23 – Intensity display
Emission intensity too low
If the actual values of the emission intensity are significantly
reduced compared to the init values (approx. factor 10 or more),
this is the probable reason for an unstable display of measured
values.
The following cases should be distinguished:
• If both actual values dropped on the test receiver, the
sample cell is probably contaminated. The sample cell
needs to be cleaned.
• If all four actual values have dropped in approximately the
same ratio on both the test receiver and the reference
receiver, the lamp intensity has probably dropped. The UV
lamp must be replaced.
If the emission intensity has become too low for proper function,
this is also indicated by corresponding status messages (see
Possible status messages on page 168).
Limas23 – Clean the sample cell
When should the sample cell be cleaned?
The sample cell must be cleaned when the display of measured
values has become unstable (drift or disruption) and the analysis
of the intensity display (see Limas23 – Intensity display on
page 179) has shown that the sample cell has been
contaminated.
Required are:
• Cross recess screwdriver PZ 2
• Hexagon socket wrench 3 mm
• Allen key 4 mm
• Slot wrench 8 mm
• For cleaning:
Neutral detergent, de-ionized water, ethanol
• For drying:
Oil and dust-free (instrument) air or nitrogen
• Spray bottle
• Plug for sealing the sample cell
• FPM hose
Sample cell removal
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).
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