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 Clearing Gas Exposures
.
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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