LumaSense Technologies INNOVA 1314i - Manual (Page 130)

Chapter 11
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BE6030-13 1314i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 130 of 199
Moisten a cotton bud with pure acetone and use it to clean the
surfaces of the unit, the retaining disc and the coarse air-filter. Refer
to Fig.11.8. Place the stub-end of the unit downwards, on a clean,
dry surface; the coarse air-filter, with its screw-end downwards on a
clean, dry surface and rest the retaining disc against it.
Caution: Make sure that no cotton fibres remain on the mesh of the
retaining disc otherwise they could be sucked up into, and block the
measurement system when the analyzer is operated.
Notes:
Only proceed to the next step when the acetone has completely
evaporated from the cleaned surfaces.
Each of the fine filter-papers DS 0759 are packed between two
pieces of packing paper. The fine filter-paper is always white in
colour.
Hold the stub-end of the unit between your thumb and fingers. Lift
the retaining disc with the tweezers and place it back into position in
the unit. Refer to Fig.11.8 .
Remove a new fine filter-paper from its packaging using the
tweezers. Hold it by its edge. Carefully place the filter-paper over the
top of the retaining disc so that it is held in position by the small “lip”
on the rim of the unit.
Screw the coarse air-filter over the end of the external air-filtration
unit. Make sure that the fine filter-paper remains in its correct
position directly over the retaining disc.
11.2 Cleaning the Filter in the Ventilation Unit
A small ventilation unit is mounted on the back panel of the Monitor
(see in Fig.11.9 ). The ventilating fan in this unit circulates air
through the Monitor to keep it cool. To ensure that the air being
drawn into the Monitor is free of particles a filter pad is placed be-
tween the fan and grid which covers it. This filter needs to be
periodically taken out and cleaned. We recommend that this task is
done at least as often as calibration, and more frequently if the
Monitor is working in a very dusty atmosphere or an atmosphere
containing high concentrations of other particulate matter.
Use a “pozidrive” screwdriver to unscrew the screw on the grid cover.
Remove the filter pad from inside the grid cover. Wash the filter pad
in warm water containing some liquid soap. Rinse all the soap out of
the filter, by running clean water through it, and let it dry
thoroughly.
Place the clean, thoroughly dry, filter pad inside the grid cover.
Screw the grid cover firmly back in place over the ventilation unit.