LumaSense Technologies INNOVA 1314i - Manual (Page 147)

Chapter 12
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BE6030-13 1314i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 147 of 199
water bath is linked up to an extra “empty” flask. This is to prevent a
situation where the level of water in the controlled water-bath rises
and covers the outlet tube “A” and draws water, via the “Y”-piece,
directly into the Monitor’s analysis cell. Water will seriously damage
the cell. To avoid such a situation, we suggest that the wet air from
the water-bath outlet tube is fed into an extra empty flask before
being fed to the air-inlet of the Monitor. Note the length of the
respective tubes in the flasks. It is vitally important that any
water, which collects in the extra flask, does not cover the short
outlet tube “B”.
It is very important that the concentration of water vapour used is
below the saturated water-vapour pressure of the air in the room
where calibration is being performed; otherwise water vapour will
condense out in the analysis cell. In practical terms this means that:
· The Monitor must have time to reach the ambient temperature of
the room before a calibration task is performed.
· The temperature of the water bath you use should be at least 2°C
below the ambient temperature of the room where calibration is
to be performed. So, if your ambient temperature is 20°C, make
sure that the temperature of the water-bath you use is set at a
maximum of 18°C.
Fig.12.7 Schematic diagram of the equipment necessary to produce
a supply of clean, wet air.