GasAlertMicro 5/PID/IR
User Manual
28
STEL Period
TWA Method
OSHA Method:
8 hour moving average—oldest value (first hour) is
replaced by the newest value (ninth hour).
ACGIH Method:
Infinite accumulated average to 8 hours—total
accumulation, whether it is 2 hours or 8 hours.
After selecting the desired sensor, press
H
to scroll to
TWA method
.
Press
C
within 20 seconds to confirm.
Note
If the TWA method has been changed, the TWA, STEL, and
MAX values must be reset to ensure the TWA is calculated
correctly. Refer to
.
The short-term exposure limit (
STEL period
) option provides
protection for workers from over exposure to high concentrations
of gas, and is based on 5-15 minute intervals.
The
STEL period
option is available for
every toxic sensor.
After selecting the desired sensor, press
H
to scroll to
STEL period
and press
C
within 20 seconds to confirm.
The STEL period can be set from 5 to
15 minutes. Press
G
or
H
to scroll to the
required value, and then press
C
within
5 seconds to confirm.
If
C
is not pressed within 5 seconds to
confirm the new value, the detector
retains the previous value and returns to
the user options menu.
The detector is shipped with the
STEL
period
set to 15 minutes.
The
TWA
method
(time-weighted average)
option is a safety measure used to calculate
accumulated averages of gases to notify the
user when the maximum average is
accumulated. The options are the
OSHA
or
ACGIH
calculating method.
A check displays in the checkbox of the
currently selected method. To select the
other method, press
H
to move the check
to the other method. Press
C
to confirm the
selection.
The detector is shipped with the
OSHA
method enabled.
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