LumaSense Technologies INNOVA 1314i - Manual (Page 126)

Chapter 11
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BE6030-13 1314i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 126 of 199
Whenever the Monitor needs to be calibrated, we recommend that
the fine filter-paper in the internal air-filtration unit is changed
before you calibrate. The fine filter-paper in the internal air-filtration
unit must be changed at least twice a year; and more frequently if
the environment in which the monitor is working contains large
quantities of particulate material suspended in the air.
When the monitor is making measurements, we recommend that a
length of Teflon ® tubing (of up to 50 metres in length) is always
attached to the stub of the air-inlet (see Fig.11.1 ) and that the
special external air-filtration unit UD 5023 (optional accessory),
shown in Fig.11.3, is always attached to the free-end of the sampling
tube, by means of the small stub. An external coarse metal air-filter
prevents large particles, insects etc. being drawn into the unit, while
inside the unit is a fine (10µm) filter-paper, which prevents any finer
particles from entering the Teflon ® sampling tube. The fine filter-
paper in this unit must also be changed regularly – at least as
frequently as the fine filter-paper in the internal fine air-filter.
Fig.11.3 The external air-filtration unit UD5023 used with the
Monitor, (optional accessory)
Changing the fine filter-paper in both the internal and external air-
filtration units is explained step by step in the following two sub-
sections.
11.1.1 Changing the Filter-paper in the Internal Air-
filtration Unit
While you do this, we recommend that you wear clean, rubber
gloves.
Tools and equipment required: