2 performing a span calibration – stand-alone use – LumaSense Technologies INNOVA 1314i User Manual
Page 168
Chapter 12
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BE6030-13
1314i Photoacoustic Gas Monitor
LumaSense Technologies A/S
Page 168 of 199
12.9.2 Performing a Span Calibration – Stand-alone Use
The general equipment necessary to perform a calibration task is
described in
. Follow the procedure from step 1 to step 3
inclusive and then continue as follows:
1.
a. Connect the free-end of the Teflon tubing mentioned in step 3
to the pressure valve on a cylinder of calibration gas.
b. Press
¿
.
c. Gently open the pressure-valve on the gas cylinder and
regulate the flow of gas so that when the Monitor’s pump is
running there is a positive flow of gas out of the flow meter.
This will ensure that the calibration gas is not diluted by
atmospheric air.
The following text appears on the screen:
RESULTS NOT YET AVAILABLE
PLEASE WAIT
Once the first measurement result is available the screen text
illustrated above is replaced by a screen displaying the
measurement results – for example the following:
W : µ : 5.34 µV σ : 212 nV 3 40.4 °C
PRESS ENTER WHEN RESULTS ARE STABLE
As soon as measurement results are available, they not only
appear on the display (see
) but are automatically
printed out on the printer, if the Monitor has been set up to print
. Remember to turn off the data log
when the calibration is complete.
Each time a sample of gas is drawn into the analysis cell the
signal is measured using both optical filter “A” and the water-
vapour filter (“W”) but, due to lack of space on the display, the
Monitor only displays the signal measured using the water-vapour
filter. The data-log print-out, however, shows the signal measured
using both the water-vapour filter and filter “A”. If cross-
compensation calibration was also selected in the calibration
set-up, then the signal is measured in the cell using all the
installed filters.
A maximum of 6 measurements are stored in the Monitor during
any calibration. The number (n) indicates how many
measurements are stored. When 7 measurements have been