Cold Weather Operation - MSA FireHawk M7XT Fonctionnement/Entretien

Suggested Procedures for Cold Weather Operation
Moisture can cause problems in the air mask if it freezes.
However, moisture can cause freezing problems even if the
surrounding air is above freezing. Air flowing from the cylinder
through the first and second stage regulators drops from cylin-
der pressure to close to atmospheric pressure very quickly.
This causes the air to expand and creates a cooling effect.
Although the surrounding temperature may be warmer than
32°F, the temperature inside the regulator may be lower. Any
water inside could turn to ice and restrict airflow.
Prior to storage of the air mask at temperatures below 0˚F, veri-
fy that the FireHawk M7XT Power Module, FireHawk M7 HUD,
and FireHawk M7 I-HUD are equipped with full charge batter-
ies. Verify that the FireHawk M7 HUD and FireHawk M7 I-HUD
do not display low battery status indicators.
1. To keep moisture from entering the mask mounted regula-
tor, keep the Firehawk Regulator in the belt mounted
regulator holder when not in use.

COLD WEATHER OPERATION

2. When the air mask is away from heat, water spray can
3. Moisture can enter through the cylinder valve or coupling
4. When cleaning the air mask, ensure water does not enter
5. Thoroughly dry the facepiece and mask mounted regula-
NOTE: Fresh batteries must be installed in the FireHawk M7
HUD or I-HUD, FireHawk M7XT Power Module prior to storage
of the air mask at cold temperature for an extended period of
time.
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freeze on the Firehawk Regulator surface. Ice can build up
and bind the side buttons or the bypass valve. Before
entering or re-entering a hazardous atmosphere, ensure
the side buttons and bypass valve are ice-free and operat-
ing properly. Periodically check the bypass to be sure it is
ice-free.
nut when cylinders are replaced on the air mask. When
replacing cylinders, ensure moisture or contamination
does not enter the system. Remove any ice from these fit-
tings. Wipe the coupling nut threads and cylinder valve
threads before installing a new cylinder. Water can conta-
minate the system and freeze.
the facepiece or Firehawk Regulator.
tor after cleaning and disinfecting. Follow Confidence
Plus® Cleaning Solution instructions.
MSA 314 (L) Rev. 2 - 10128861