INTERSPIRO 90USA, User Manual

11

5  aPParaTus Pre-use check

1.

  Switch off positive pressure, see section 3.

2.

   Open the cylinder valve fully.

3.

   With the cylinder valve still open and the positive pressure turned off, read the 

shoulder mounted pressure gauge.

nOTe!

 THE CYLIndER VALVE PRESSURE GAUGE And THE SHOULdER MOUnTEd PRESSURE GAUGE MUST REAd 

FULL PRIOR TO USE. AIR CYLIndERS OF ALL SCBA SHALL BE MAInTAInEd AT nOT LESS THAn 90 PERCEnT OF 
THE RATEd PRESSURE STAMPEd On THE CYLIndER.

4.

   Close the cylinder valve. The needle of the shoulder mounted pressure gauge 

should not move during one minute: If it does - indicating leakage - repairs should 

be made by an authorized service personnel and the test repeated.

5.

   With the cylinder closed, open the by-pass valve slightly in order to allow the air 

to slowly evacuate. Read the pressure gauge when the audible alarm starts to 

sound. The pressure gauge should read ¼ full. For the 90USA or 90USA-S 4500 

psi cylinder pressure versions, the alarm should sound at approximately 1090 

psi. For the 90USA or 90USA-S 2216 psi cylinder pressure versions, the alarm 

should sound at approximately 580 psi.

.

   When the alarm sounds, turn the by-pass valve to the “OFF” position.

.

   depressurize the system by turning on the positive pressure, see section 3.