DONNING AND USE
except in a safe, non-hazardous, non-toxic atmos-
p
here. Failure to follow this warning can result in seri-
ous personal injury or death.
USING THE C420 PAPR
O
nce the user has properly donned the respirator the
blower should be turned on and the hazardous atmos-
phere may be entered.
Immediately leave the contaminated area if the air-
borne contaminant is detected by odor, taste, eye irri-
tation, or if any discomfort is felt during use. Failure to
follow this warning can result in serious personal
injury or death.
If air flow is noticeably decreased or stops completely,
leave the contaminated area immediately. Failure to
follow this warning can result in serious personal
injury or death.
If the battery compartment becomes hot to the touch,
leave the contaminated area and turn the switch to
the “OFF” position immediately, decontaminate if nec-
essary, and check the respirator. Failure to follow this
warning can result in serious personal injury or death.
IN-USE FLOW TEST
When to Conduct an In-Use Flow Test
1. If, at any time, the user leaves the contaminated area,
perform an in use flow test and negative pressure seal
test before reentering the contaminated area.
2. If using a single use LI-SO2 battery, conduct an in-use
flow test after four (4) hours of use and again two (2)
hours later after six (6) hours of use.
Conducting an In-Use Flow Test
Note: The user must leave the contaminated area and if
n
ecessary, be decontaminated.
1. Remove the breathing tube from the blower.
2. Install the airflow indicator (Refer to the Air Flow Test
with Cartridges Installed section).
3. Turn the blower assem-
bly switch to the “ON”
position. Ensure the
red ball rises above the
line on the air flow indi-
cator.
DO NOT use the respirator if the red ball does not rise
completely above the line on the air flow indicator.
Failure to follow this warning can result in serious per-
sonal injury or death.
a. If the red ball does not rise completely above the
line on the air flow indicator:
• Replace the battery and recheck airflow
• Reseat the canisters and recheck airflow.
b. If the red ball still DOES NOT rise completely above
the line on the air flow indicator remove the respira-
tor from service.
Note: If, after obtaining an acceptable flow test, the user
intends to reenter the contaminated area, a successful
negative pressure seal test must be performed (Refer to
the Donning section).
14
TAL 706 (L) Rev. 2 - 10072074
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