Sundstrom SR307, User Instruction

3

SR 307 Compressed air attachment

English

Contents

1

General information / Approval

1.1

 Applications 

1.2

System description

1.3

Breathable air

2

 Use

2.1

 Unpacking

2.2

Packing list

2.3

Functional check

2.4

Putting the equipment on

2.5

Taking the equipment off

2.6

Cautions / limitations

3

Technical specification / S – Special or 

Critical Users Instructions

4

 Maintenance

4.1

 Cleaning

4.2

 Storage

4.3

Maintenance schedule

4.4

Spare parts

4.4.1

 Regulator

4.4.2

Breathing hose

5

List of parts

5.1

Spare parts

5.2

 Accessories

6

NIOSH/DHHS Labels (Separate insert 

pages included with this booklet)

1. General information / Approval

The Sundström model number SR 307 Compressed air attach-

ment is a Type C, Continuous Flow, Supplied Air Respirator 

(CF/SA). SR 307 has been tested and approved by NIOSH to 

provide the approved level of respiratory protection to a user. 

The Sundström SR 307 compressed air attachment can be 

used together with Sundström half mask SR 90-2, SR 100 and 

with full face mask SR 200. 

1.1  Applications

The SR 307 is an attachment that enables a given half mask 

or full face mask to be converted between an Air Purifying 

Respirator and a Supplied Air Respirator.

It is particularly well suited if the user is doing hard or sustained 

work, and if the pollutants have poor warning properties or are 

particularly toxic.

The SR 307 is made of materials which do not give rise to 

frictional sparks.

1.2  System description

The SR 307 mounted in a Sundström half mask or full face mask 

is designed for connection to a suitable source of breathable 

compressed air. The pressure in the mask prevents polluted 

ambient air from entering the mask. A compressed air supply 

hose approved for breathable air is connected to a regulator 

which is secured to the user’s belt. The airflow rate to the mask 

can be adjusted by means of the regulator. The regulator is 

equipped with a warning whistle which will come into operation 

if the air flow rate should drop below the recommended value. 

From the regulator, the air flows through a breathing hose to a 

compressed air attachment, and then into the mask.

1.3  Breathable air

Breathable air shall conform to the requirements of CGA G-7.1 

Grade D or higher quality. 

2  Use

2.1  Unpacking

Check that the equipment is complete in accordance with 

the packing list and that no transport damage has occurred.

2.2  Packing list

•  Compressed air attachment with hose

•  Regulator mounted on a belt

•  Locking ring

•  Flow meter

•  User’s instructions

2.3  Functional check

Check that the mask is complete, correctly assembled, 

thoroughly cleaned and undamaged.

Check that the airflow – measured through the mask – is at 

least 5.3 CFM (150 l/min).

Proceed as follows:

•  Connect the breathing hose to the regulator. Fig. 2.

•  Connect the compressed air hose to the regulator. Fig. 3.

•  Turn the regulator knob anti-clockwise as far as it will go in 

order to throttle the airflow rate to a minimum. Fig. 2.

•  Place the mask in the bag, and grip the lower part of the bag 

so that the bag seals around the breathing hose. Fig. 1:4

•  Grip the flow meter with the other hand and hold it so that 

the tube points vertically up from the bag. 

•  Read the position of the ball in the tube. It should float level 

with or just above the marking on the tube.

Hint: Turn the bag inside out and use it for storing the 
equipment

If the flow rate is below the minimum value, check that

•  the flow meter is vertical,

•  the ball can move freely,

•  the air supply is not restricted by kinks or other restrictions 

in the hoses.

N.B. If the flow rate is below the minimum value, the 

equipment must not be used. Get in touch with the supplier 

or manufacturer.

2.4  Putting the equipment on

•  Put the belt on and adjust the belt length.

•  Arrange the regulator in a way that allows easy adjustment 

of the flow rate and a strict watch over the breathing hose, 

i.e. it must not be placed on the back of the waist.

•  Then adjust the harness so that the mask is held firmly but 

comfortably in place. See the user instructions for the mask 

you are using.

•  Then fit the compressed air attachment to the mask. The 

locking ring should always be used for securing the mounting 

of the compressed air attachment. Fig. 1:6

•  Connect the breathing hose to the control valve outlet. Fig. 2.

•  Unroll the compressed air hose and make sure that it is not 

twisted.