Thermal Alarm; Secondary Alarm Icons - MSA G1 SCBA Operating Manual

Control Module

9.3.1 Thermal Alarm

WARNING!
Although the thermal alarm provides an indication that the temperature/time curve is exceeded,
because of variations in individuals and protective clothing, the curve may not represent the threshold
to injury accurately. Use the thermal alarm only as a reference to increasing temperature/time. Do not
use the thermal alarm as a substitute for standard operating procedures for escape from temperature/
time extremes.
Failure to obey this warning can result in serious personal injury or death.
If the option for the thermal alarm is activated, the control module monitors thermal conditions. The
thermal alarm can be set as a primary or secondary (default) alarm. If the user is exposed to more
than the preset limit of thermal load (temperature/time), the secondary alarm shows on the control
module and the power module emits a tone every 5 seconds.
The following figure shows the thermal alarm activation curve for the control module. The tempera-
ture/time limits correspond to this graph. The thermal alarm activates if the preset limit exceeds the
curve shown on the graph. Depending on the severity of conditions, the alarm will self-cancel. This
may occur even though the temperature is above the thermal curve.
US
NOTE: This chart was generated from data obtained in a laboratory setting and is for reference only.
Conditions are highly variable in an actual-use scenario. Users of the thermal alarm option should
develop procedures for the use of this feature.

9.3.2 Secondary Alarm Icons

The secondary alarm icons indicate that a thermal alarm, battery alarm, or loss of radio connection
occurred. These icons show on the primary screen until the condition is corrected (for example, the
radio connection is re-established).
The evacuate alarm can only be cleared by restarting the SCBA.
G1 SCBA 2018 Edition 52