2
Principle o
f Oper
ation / Battery P
ack
EVA Series - Principle of Operation
The EVA Series Powered Air-Purifying Respirator (PAPR) System is configured in
six parts:
1. The blower and belt assembly:
EVA1 Blower Unit
EVABELT1, EVABELT2 - Comfort Belt, Decon Belt
PA1AFI Air Flow Indicator
2. The battery pack (Part No. EVABAT1). One fully charged pack will power the blower
for approximately 4 to 10 hours depending upon factors such as speed, cartridge
selected and cartridge loading.
3. The breathing tube, which is available in three different types and three lengths:
PAHBT Powered Air Hood Breathing Tube Assembly (standard length 26”)
PAHBTXS Powered Air Hood Breathing Tube Assembly (short length 22”)
PAHBTXL Powered Air Hood Breathing Tube Assembly (long length 32”)
PA1BT Hood breathing tube assembly with clamp (standard length 26”)
PA1BTXS Hood breathing tube assembly with clamp (short length 22”)
PA1BTXL Hood breathing tube assembly with clamp (long length 32”)
PA20LFBT Loose fitting facepiece breathing tube assembly (standard length 32”)
PA20LFBTXS Loose fitting facepiece breathing tube assembly (short length 26”)
PA20LFBTXL Loose fitting facepiece breathing tube assembly (long length 38”)
4. The High Efficiency Particulate Arrestance (HEPA) filter or chemical filter cartridge.
5. The hood with headband suspension (except for the RT Series) and/or hard hat, or
loose fitting facepiece. The following hood models may be used with the EVA Series
blower unit:
GRH/GRHT Grinding hood with inner bib
RT1/RT1T Hood with long inner and outer bib (NIOSH approved for use without a
headband suspension)
RT2/RT2T Hood with long inner and outer bib (NIOSH approved for use without a
headband suspension)
RT3/RT3T Hood with long inner and outer bib (NIOSH approved for use without a
headband suspension)
RT4/RT4T Hood with long inner and outer bib (NIOSH approved for use without a
headband suspension)
20TJN/20TJNT Hood
20TICN/20TICNT Hood with inner bib
20TICH/20TICHT Hood for use with Bullard hard hat
20TICSN/20TICSNT Hood with taped and sealed seams
20SICN/20SICNT Hood with taped and sealed seams
20SICVN/20SICVNT Hood with taped and sealed seams and PVC lens
20SICH/20SICHT Hood with taped and sealed seams for use with Bullard hard hat
20SICVH/20SICVHT Hood with taped and sealed seams and PVC lens for use with
Bullard hard hat
20LFXL Loose fitting facepiece, extra large size
20LFL Loose fitting facepiece, large size
20LFM Loose fitting facepiece, medium size
20LF2L Loose fitting facepiece (narrow profile), large size
20LF2M Loose fitting facepiece (narrow profile), medium size
20LF2S Loose fitting facepiece (narrow profile), small size
6. The Battery Charger:
EVASMC Quick charger (single port)
EVAGC Gang charger (six port)
The blower unit draws in ambient air through the cartridges. The purified air is blown
into the wearer’s hood through the breathing tube. A flow indicator is provided to
check that there is an adequate volume of air available to the wearer prior to use. The
system is designed to operate at a minimum air flow of approximately 7 cubic feet of
air per minute (198 liters per minute) in the hood under normal use on the standard
speed setting, and 8.5 cubic feet of air per minute (240 liters per minute) in the hood
under normal use on the high speed setting. A feedback loop from the Mass Flow
Sensor to the impellor continually monitors and adjusts the air flow to keep it constant
at the design set point.
The units are designed for use at temperatures from 23ºF to 129ºF (-5ºC to 55ºC). The
unit will shut down if operated outside this temperature range. A high temperature
alarm will sound at 50ºC (122ºF). The battery pack mounts in a compartment on
the back of the blower. A fully charged battery pack will power the blower for
approximately 4 to 10 hours depending upon factors such as speed selected, cartridge
selected, and filter/cartridge loading.
The EVA Series Blower is equipped with two alarms: A 77 db continuous alarm will
sound when the air flow falls below approximately 185 lpm and a 77db intermittent
chirp alarm will activate to indicate that the battery has approximately 15 minutes of
remaining capacity.
Type C Airline Respirators
CC20 Series (TC-19C-0154),
RT Series (TC-19C-0412), GRH Series (TC-19C-0329)
Most of the same headpieces approved for use with the CC20, RT, and GR50 Series
of supplied air respirators (SAR) are also approved for use with the EVA Series of
powered air-purifying respirators. CC20, RT and GR50 Series respirators provide a
high level of respiratory protection and user comfort over long work periods, in a wide
variety of hazardous environments.
The CC20, RT and GR50 SAR air flow control devices and other components are
described in the CC20, RT and GR50 Series User Instructions.
Battery Pack
One fully charged battery pack will power the blower for approximately 4 to 10 hours
depending upon factors such as speed selected, cartridge selected and filer/cartridge
loading.
NOTE
The battery has built-in short circuit protection. In the event of a short circuit, an
internal polyfuse will trip. The fuse will reset itself within 5-10 seconds allowing
the battery to resume normal operation.
To charge the battery pack, do the following:
• Press the battery release on the pack to remove the battery from the back of the
blower. (See Figure 1.)
• Connect the battery charger to a 110-volt AC electrical outlet.
• Place battery upside down into the charging port of the battery charger. (Figure 2.)
• Charge the battery pack for approximately 4 hours.
While the battery is charging, the light on the charger will remain red. The charger light
will illuminate green when charging is complete.
Table-top gang chargers EVAGC with 6 ports are also available.
Battery
release
Figure 1
Figure 2
