LumaSense Technologies INNOVA 1412i - Manual (Page 131)

Chapter 11
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BE6025-15 1412i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 131 of 202
Monitor. Screw it back into its mounting. To do this, turn the unit
clockwise with your fingers to tighten until it is in position.
Fig.11.7 Refitting the retaining disc
11.1.2 Changing the Filter-paper in the External Air-
filtration Unit
While you do this, we recommend that you wear clean, rubber
gloves.
Tools and equipment required:
Acetone (analytically pure)
Spare fine filter-paper DS 0759
Tweezers with Teflon coating
Cotton buds
Clean rubber gloves
To change the filter-paper:
Switch off the Monitor.
Put a rubber glove on the hand which is to hold the parts of the unit.
Pull the external fine air-filtration unit off the end of the Teflon ®
sampling tube. Hold the stub-end of the external air-filter unit
between your thumb and fingers, and unscrew the coarse air filter
from the end of the unit. Refer to Fig.11.3 .
Remove the used (old) filter-paper and the retaining disc from the
unit using the tweezers. Refer to Fig.11.8 .