Maintenance and Cleaning
MSA
SSR 90 [K60]
GB
13
4.3
Tightness Test
The tightness test of the device is carried out using the MSA tightness tester for
chemical oxygen breathing protection apparatus. Detailed descriptions of the struc-
ture, function, use and maintenance of the tightness tester can be taken from the
relevant operating manual of the tightness tester [
Æ
chapter 8].
The tightness test of the device is carried out as follows:
(1) Push the device without any straps into the tightness tester in such a way that
the cover points towards the door.
(2) Close the door and lock.
(3) Set timer to 90 s.
(4) Create overpressure with the lever, i.e. push the lever downwards until it
engages and start the timer at the same time.
(5) After 30 seconds, cover the black pointer with the red pointer.
(6) After a further 60 seconds, the timer signals the end of the test period. Then
read the pressure difference between the red and the black pointers.
The device is tight if the black pointer remains in the prescribed pressure range and
if the pressure difference is no more than 5 mbar.
If the pressure drop is more than 5 mbar, the unit must be replaced.
