RKI Instruments 01 Series Manual - Manual (Page 16)

11 • Operation 01 Series Operator’s Manual
Operation
This section describes the normal operation of the 01 Series in Measuring
Mode. It explains how the unit can be used to display peak, STEL, and
TWA readings for the HS-01 and CO-01, and minimum and maximum
readings for the OX-01. It also covers alarm indications.
Measuring Mode
To put the 01 Series in Measuring Mode, assuming the unit is off, press and
hold the POWER/MODE button for three seconds.
Before continuing, it is advisable to perform a fresh-air adjustment in a
fresh-air environment. Making this adjustment ensures accurate gas
readings in the monitoring environment. Refer to “Start Up” for more
information.
In Measuring Mode, the battery level and target gas concentration are
displayed on the LCD. The battery icon has four bars visible when the
batteries have a full charge. As the battery charge decreases, the bars will
gradually disappear, one by one.
The target gas concentration is displayed below the battery icon. On the
CO-01, CO is displayed in parts per million (ppm). On the HS-01, H
2
S is
displayed in ppm. On the OX-01, oxygen is displayed as volume percent
Displaying the Peak, STEL, and TWA (CO-01 & HS-01)
You can display the Peak, STEL, and TWA readings on the CO-01 and
HS-01 when the 01 Series is in Measuring Mode using the POWER/MODE
button. STEL is an acronym for short-term exposure limit, and it is the
average reading of the target gas (H
2
S or CO) during the last 15 minutes.
TWA is an acronym for time-weighted average, and it is the average
reading for the target gas (H
2
S or CO) 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, STEL, and TWA readings are cleared when the unit is
turned off.
0.0
Battery level
Gas concentration
Figure 3: LCD in Measuring Mode
ppm