RKI Instruments SC-01 - Manual (Page 18)

13 • Operation in Measuring Mode SC-01 Operator’s Manual
Operation in Measuring Mode
This section covers the operation of the SC-01 in Measuring Mode. It
explains Normal Operation, Display Mode, and alarm indications.
Normal Operation
When the SC-01 comes out of its startup sequence, see “Start Up” on
page 10, it is in normal operation if no alarm indications are taking place. It
is advisable to perform a fresh air adjustment when the SC-01 comes out
of its startup sequence as described in “Start Up”.
In the Normal Operation screen of Measuring Mode, the battery level,
target gas, and target gas concentration are displayed on the LCD. The
battery icon has three bars visible when the batteries have a full charge. As
the battery charge decreases, the bars will gradually disappear, one by one
from left to right.
Display Mode
You can access Display Mode when in Measuring Mode by using the
▲ DISP button. In Display Mode you can view the detection range full
scale, peak reading, the STEL value, and the TWA value, the date and
time, and the amount of datalogging time remaining. STEL is an acronym
for short-term exposure limit, and it is the average reading of the target gas
during the last 15 minutes. TWA is an acronym for time-weighted average,
and it is the average reading for the target gas during the last eight (8)
hours. If eight (8) hours has not elapsed since the unit was turned on, the
TWA is still calculated over eight hours, with the missing time assigned a
zero (0) value for the readings. Similarly, if the unit has not been on for 15
minutes, the missing time is assigned a 0 value and the STEL is calculated
over 15 minutes. The peak reading, STEL value, and TWA value are
cleared when the unit is turned off.
To view the various items in Display Mode, do the following:
1. Make sure the SC-01 is in Measuring Mode. The SC-01 must be in
Measuring Mode for you to access Display Mode.
Figure 4: LCD in Measuring Mode
SO2
0.00
PPM