LumaSense Technologies LumaSoft Gas Multi Point 7860 - Manual (Page 39)

Chapter 3
_________________________________________________________________________
________________________________________________________________________
BE6027-12 LumaSoft Gas Software LumaSense Technologies A/S
7810 and 7860 Page 39 of 194
By selecting Auto the monitoring system controls the flushing by
selecting the optimum flushing time. This time can vary as the option
takes into account the cleanness of the external air filters and the length
of the sampling tube. Type in the length of the tubing. (See Figure
3.18 ).
Selecting Fixed Time allows the user to define a flushing time for
chamber and tubing. Table 3.1 shows the acceptable values for flushing
chamber and tubing.
Acceptable Values Interval Default
Value
Chamber: 2 to 60 s
Tube: 0 (=off), 3 to 120 s
1 s
1 s
8 s
3 s
Table 3.1 Acceptable values for flushing the system when selecting Fixed
Time flushing
In the Compensation group box, see Figure 3.18, compensation for
Water and Cross Interference can be checked on/off.
It is suggested that Water should be compensated for in all measuring
situations except where extremely dry gases are being measured.
If any interfering gas other than Water Vapour is present in the ambient
air sample, the Monitor can cross compensate for the interference
caused by its presence provided that a selective optical filter is installed
in the Monitor to measure the concentration of the interfering gas
present.
In the Sample Information group box, see Figure 3.18, select whether
multiplexer sequences are continuous. Select Sample Continously if
you want the next multiplexer sequence immediately after finishing the
previous multiplexer sequence. If Sequence Interval is selected a time
interval (in minutes) can be set to define the start of one multiplexer
sequence to the beginning of the next. If no multiplexer is used the time
interval will be between the individual samples.
Gas Index Card
Select the Gas index card and press the Read Filter Info soft-key ( See
Figure 3.19 ) to read the filter configuration from the Monitor.