LumaSense Technologies INNOVA 1314i - Manual (Page 192)

Chapter 14
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BE6030-12 1314i Photoacoustic Gas Monitor LumaSense Technologies A/S
Page 192 of 199
The above message indicates that the Conversion factor calculated
during span calibration of a particular filter deviates more than 15%
from the Conversion factor calculated during the last span
calibration of this filter. If you are absolutely sure that the previous
span calibration of this filter was correctly performed then this
message could indicate:
1. That you have “entered” the wrong concentration for the span-gas
in the span calibration set-up.
2. That the concentration of your span gas is not correctly quoted on
its “Analysis Certificate”.
3. That there is a leak in the tubing/fittings in your calibration
equipment, which alters the concentration of the span gas
reaching the cell.
NO CROSS INTERFERENCE FOUND
This message is associated with a combined cross-interference and
span calibration task.
The above message indicates that the signal measured with a
particular filter (for example “A”) when a certain gas (for example “B”)
was in the cell is less than 1.5μV. This indicates that there is
effectively no signal contribution from gas “B” when filter “A” is used,
i.e. gas “B” does not interfere with measurements made with filter “A”.
In this case the factor “Gas B’s” Interference on Filter “A” listed in
the calibration data bank (see section 12.3.2 ) will be seen to be zero.
HIGH CONC. SPAN MEASUREMENT TOO LOW
This message is associated with a two-point span calibration task.
The above message indicates that the signal measured during span
calibration, when the high concentration of span gas is in the cell, is
less than 15µV. This means that the “high” concentration of span gas
is too low.
LOW CONC. SPAN MEASUREMENT TOO LOW
This message is associated with a two-point span calibration task.
The above message indicates that the signal measured during span
calibration, when the low concentration of span gas is in the cell, is
less than 3µV. This means that the “low” concentration of span gas is
too low.