PA30 Series Powered Air-Purifying Respirator
PA3/PA3IS Blower Assembly User Manual
7
Mounting and Replacing Cartridges on the
Blower Unit
The useful life of a chemical cartridge for vapors and gases will
vary with the concentration and nature of the contaminant, the
breathing rate of the respirator wearer, and ambient temperature
and humidity.
The Occupational Safety and Health Administration (OSHA)
regulations 29 CFR 1910.134 require that the employer must
implement a change schedule when using Air-Purifying respirators
for protection against gases and vapors, if there is no end-of-
service-life indicator on the cartridges. The change schedule must
be based on objective data that will ensure that the cartridges are
replaced before the end of their service life. Factors to consider
include workplace conditions such as contaminant concentration,
relative humidity, temperature, work activities, respirator use
pattern (e.g., continuous or intermittent use), presence of other
contaminants, potential for contaminant migration/desorption,
health effects of the gas or vapor, and the presence of any
warning properties. Contact Bullard for further information on
change-out schedules.
High efficiency particulate filters must be replaced when retained
particles clog the filters and reduce air flow below acceptable
levels, as indicated by testing with the Air Flow Indicator.
See page 5.
To Replace Cartridges
Remove the air-purifying element from its packaging, and inspect
for damage. If in doubt do not use.
Check that the air-purifying element has not exceeded its “use-by”
date and that the connecting thread is in good condition.
Check that the air-purifying element is appropriate to the hazard.
If in doubt consult your respirator program administrator or
supervisor.
Check that the threads in the blower unit port are in good
condition and clear of contaminant.
Check that the PA3BU/PA3ISBU blower ports have the rubber
gasket seals present.
Remove the air-purifying element seals
(see Figure 4)
.
Screw the air-purifying elements into the receptacles
(see
Figure 5)
until the cartridge is hand tight.
DO NOT OVER-
TIGHTEN.
When using the two PA3HE filter cartridges, install the
filter plug into one of the ports. DO NOT OVER-TIGHTEN
(Figure 6).
Mounting the Cartridges
Figure 5
Figure 4
www.bullard.com
Figure 6
