Sundstrom SR561 Installation and user guide

SR561 supplied-air hood Copyright © 2020 by The S.E.A. Group 1

SR561 supplied-air hood Copyright © 2020 by The S.E.A. Group 2
Companion module:
Sundström SR561 supplied air hood —HOW
TO…
Related material:
Sundström SR507 supplied air regulator
Sundström SR99 supplied air filter
Sundström SR500 Powered Air Purifying
Respirator (PAPR)
Sundström SR700 Powered Air Purifying
Respirator (PAPR) for particles

SR561 supplied-air hood Copyright © 2020 by The S.E.A. Group 3
About your SR561 supplied-air hood:
What is it?
A supplied-air hood is a respiratory protection
device that covers your face, head, neck and
top of the shoulders. A continuous flow of
clean breathing air is fed into the loose-fitting
head-top.
How does it work?
Clean air from a remote source (such as a
compressor or a powered fan unit) is fed into
the hood through the breathing hose at a
constant flow rate. This keeps the head-top
filled with clean breathing air at a higher
pressure than outside air, preventing any
contaminated air from entering the hood.
The main advantage of this device is that it
does not rely on a tight face seal and does not
have to be fitted perfectly to the user’s face.
This means that even bearded people can use
the SR561.
Advantages
There are many benefits associated with
wearing a loose-fitting head-top as opposed to
a tight-fitting respirator. Advantages include:
•Can be connected directly to a fan
unit, such as SR500 or SR700
•Can be used with a fixed air supply
through the SR507 regulator
•Often a good solution for bearded
users or users with skin complaints,
dentures, unusual face features or
other problems that may hinder the
use of tight-fitting masks
•Durable material
•Impact and chemical resistant visor

SR561 supplied-air hood Copyright © 2020 by The S.E.A. Group 4
Drawbacks
If you decide to connect the SR561 to a
fixed air supply, mobility can be restricted
by the supply hose. In addition, the length
of the hose limits the distance the wearer
can move away from the source of the
breathing air.
If a PAPR is chosen, the user is no longer
limited in movement.
IMPORTANT: about the quality of remote
supplied air for breathing:
•The intake air at the source
(compressor etc.) must be free of
contaminants, or at least kept to a
minimum and never exceed hygienic
limit levels
•Any mineral oil content must be kept
below the smell threshold level (about
0.3 mg/m3)
•The air must not be so cold as to cause
internal freezing of the equipment
If there are any doubts as to any of the
points above, a supplied-air filter should
be used, such as the Sundström SR99
airline filter in the picture

SR561 supplied-air hood Copyright © 2020 by The S.E.A. Group 5
Where can the SR561 be used?
The SR561 supplied-air face shield can be used
in more situations than negative-pressure
filter respirators:
•Wherever negative-pressure filter
respirators can be used
•Where the user has a beard, stubble,
moustache, goatee, whiskers,
sideburns or other facial hair that can
interfere with the facial seal of a
respirator
•Skin conditions, severe acne, dentures,
unusual face shape/size, inability to
wear a tight-fitting respirator for
psychological or other reasons
•Where the contaminant has poor
warning properties (smell or taste)
•Where the contaminant is particularly
toxic (such as two-pack paint; toluene
diethylamide and others)
•Where the concentration of the
contaminant is so high that filter
respirators are not permitted
•In flammable atmospheres (the SR561
is made from materials that cannot
cause frictional sparks)
When should the SR561 NOT be used?
•If there is not enough oxygen for
human breathing in the ambient
atmosphere
•If the contaminant is unknown
•If the contaminant is Immediately
Dangerous to Life and Health (IDLH)
•If the ambient atmosphere is oxygen-
enriched or pure oxygen
•If breathing becomes difficult
•If you can smell or taste any
contaminant
•If you feel dizzy or nauseous, or suffer
any discomfort
•If the air-pressure warning sounds

SR561 supplied-air hood Copyright © 2020 by The S.E.A. Group 6
Before fitting the head-top:
•Make sure the head-top is clean and
intact
•Make sure it is securely connected to
the air supply
•Make sure the quality of the breathing
air is adequate
•Make sure you are familiar with the
equipment and know how to use it