LumaSense Technologies INNOVA 1412i - Manual (Page 129)

Chapter 11
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BE6025-15 1412i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 129 of 202
Acetone (analytically pure)
Spare fine filter-paper DS 0759
Tweezers with Teflon coating
Cotton buds
Clean rubber gloves
To change the filter-paper:
Switch the power to the monitor “Off” by using the AC mains power
switch on its back panel (press O), and then pull out the plug
connecting the monitor to the AC mains power supply.
Put a rubber glove on the hand, which is to hold the parts of the unit.
Unscrew the internal air-filtration unit from its mounting on the air-
inlet, see Fig.11.1 . To do this, turn the unit anti-clockwise with your
fingers until the unit is free of the slot.
The unit is removed from the monitor. It is shown in Fig.11.2 .
Use the tweezers to lift off the retaining disc and used filter-paper,
while holding the handle of the unit between your thumb and fingers.
Refer to Fig.11.4. The retaining disc has two tabs which “lock” it to
the filtration unit.
Fig.11.4 Removing the retaining disc and old filter-paper
Holding the disc with the tweezers, moisten a cotton bud with pure
acetone and use it to clean the surfaces of the disc. Place the disc on
a clean, dry surface.
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 Monitor is operated.
Hold the handle-end of the unit between your thumb and fingers.
Moisten a cotton bud with pure acetone and use it to clean the
surfaces of the unit. Refer to Fig.11.5. Place the unit, with its handle-
end downwards, on a clean, dry surface.