During Use - MSA FireHawk M7XT Fonctionnement/Entretien

USING THE FIREHAWK M7XT CONTROL MODULE
NOTE: Refer to Chart 3 for the various audible and visual
indicators.
FIREHAWK M7XT CONTROL MODULE THERMAL ALARM
The FireHawk M7XT Control Module can monitor temperature
conditions if the thermal alarm option is activated. If the user
is exposed to more than a pre-set limit of time/temperature,
the thermometer icon on the FireHawk M7XT Control Module
display will flash and the FireHawk M7XT Power Module will
sound a tone every 3 seconds.
Although this thermal alarm provides an indication that the
time-temperature curve is exceeded, the curve may not rep-
resent the threshold to injury due to variations in individu-
als and the protective clothing worn. Use this alarm as a ref-
erence only to increasing time-temperature. Do not use as a
substitute for standard operating procedures regarding
escape from time-temperature extremes. Misuse can result
in serious personal injury or death.
Chart 4 shows the FireHawk M7XT Control Module thermal
alarm activation curve. The time/temperature limits corre-
spond to this graph. The thermal alarm sounds if the pre-set
limit exceeds the curve displayed on the graph. The alarm will
self-cancel depending on the severity of conditions. This may
occur even though the temperature is above the thermal
curve.
Chart 4: FireHawk M7XT Control Module Thermal Alarm
Activation Curve
THERMAL ALARM ACTIVATION
Conditions which will
precipitate Thermal Alarm
TIME TO ALARM, MINUTES
NOTE: This chart was generated from data obtained in a labora-
tory setting and is for reference only. Conditions are highly vari-
able in an actual use scenario. Users of the FireHawk M7XT
Control Module with the thermal alarm option should develop
procedures for the use of this feature.
USING THE AIR MASK
WARNING

DURING USE

NOTE: Refer to Chart 3 for the various audible and visual indi-
cators for the FireHawk M7XT Control Module and FireHawk
M7XT Power Module.
FireHawk M7XT Control Module Pressure Display
1. Periodically check the pressure indicated on the FireHawk
M7XT Control Module display. It will display either remain-
ing cylinder pressure (default) or calculated remaining ser-
vice time.
2. When the pressure reaches 33% of the rated service pres-
sure, the alarm button on the FireHawk M7XT Control
Module will flash red and the FireHawk M7 HUD or I-HUD
will display one flashing red LED.
3. When the pressure reaches approximately 33% of the
rated service pressure, return to fresh air.
Changing the FireHawk M7XT Control Module Display Mode
1. Press the top mode button (green) once. This will momen-
tarily refresh FireHawk M7 HUD or I-HUD display as well as
light the FireHawk M7XT Control Module display.
2. While the FireHawk M7XT Control Module display is still lit,
press the top mode button (green) again. This will toggle
the display from remaining cylinder pressure to calculated
remaining service time.
The FireHawk M7XT Control Module has the ability to dis-
play calculated remaining service time counting down to 0%
(default) or 33% of the rated service pressure (see the
FireHawk M7 Interface Module Instructions, P/N 10088977).
The user must determine which option has been selected for
the FireHawk M7XT Control Module in service. Misuse can
result in serious personal injury or death.
Actual time remaining may be less than the calculated time
displayed. Increases in breathing rate may reduce remaining
time more than expected. Use time indicator as general
guide only. The time displayed is based on the continuation
of the average breathing rate over the last three minutes.
Increases in the breathing rate after checking the displayed
time may result in less remaining time than anticipated.
Misuse can result in serious personal injury or death.
21
WARNING
WARNING
MSA 314 (L) Rev. 2 - 10128861