GasAlertQuattro
User Manual
34
3. Enter a value (
4
-
16
hours) in the
TWA Period (hours)
field to
define the duration of the moving average. For more informa-
tion, refer to
.
STEL Alarm
The short-term exposure limit (STEL) is the maximum permissible
gas concentration a worker can be safely exposed to for short periods
of time (5-15 minutes maximum).
Note
Standard factory alarm setpoints may vary by region. Refer
to
for US OSHA factory settings.
1. Refer to the applicable regulatory requirements in your
area for defining STEL alarm setpoints.
2. Enter the STEL setpoint for the H
2
S and CO sensors in the
STEL Alarm (ppm)
field (not applicable to O
2
and LEL sen-
sors).
3. Enter a value (
5
-
15
minutes) in the
STEL Interval (minutes)
field to define the short-term exposure limit. For more informa-
tion refer to
.
Correction Factor (LEL)
The
Correction Factor
option defines compensation factors for hydro-
carbons other than methane. The correction factor is only applicable to
LEL and can only be applied if the LEL sensor has been calibrated with
methane.
The correction factor that is entered in Fleet Manager II displays during
the startup self-tests.
STEL Interval
The
STEL Interval
option provides protection for workers from over
exposure to high concentrations of gas, and is based on user-defined
5-15 minute intervals. When the maximum STEL is reached, the detector
alarms to notify the worker.
a
Caution
Follow all safety procedures as defined by your
employer.
Enter the interval (
5
-
15
minutes) in the
STEL Interval (minutes)
field.
The detector is shipped with a default setting of
15
minutes.
