RKI Instruments SDM-E2 - Manual (Page 120)

115 • Logs Button
7. In the graph part of the screen,
• You can choose which gas(es) you want to graph by selecting or
deselecting the boxes next to each gas name.
• You can select the display units for the catalytic LEL channel (%LEL, ppm,
vol%). While readings can be recorded in any of these units and stored in
the same file, those readings may only be graphed in one unit at a time. If
%LEL is chosen as the unit, any ppm or %volume data is converted and
graphed as %LEL. The user may change back and forth between the units
for the graph and still have all data shown. The CAT Range Select box is
where the user may select %LEL, ppm, or %volume as the units for the
graph.
• If installed, an IR HC or CH
4
channel can be graphed in %LEL or % volume
in order to accurately depict the full range of the sensor.
If the channel is configured as a %LEL only channel, then data will only be
recorded in %LEL and the range will be 0-100% LEL. Any gas
concentration above that level will not be recorded.
If the channel is configured as a %LEL/% volume autoranging channel,
then data will be recorded in %LEL and % volume where appropriate. It will
record data in %LEL up to 100% LEL and then it will start recording data in
% volume up to 100% volume. If %LEL is chosen as the graphing units, all
data collected for a %LEL only channel will be displayed. Any data
collected in an autoranging configuration that exceeds 100% LEL will not
be shown. In order to view data above 100% LEL, % volume must be
selected. When % volume is selected, all data will be shown in terms of %
volume.