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MAINTENANCE PROCEDURE G260 – REVISION 02 - 2013-04
ADJUSTMENT
WARNING: To adjust a 2
nd
stage correctly, it’s must be connected to a appropriate
and well adjusted 1
st
stage (with a interstage pressure between 9,3 - 9,7 bar) and a
tank with a minimal filling pressure of 200 bar.
1.
Check that the adjustment knob is still screwed out completely to achieve the lightest
breathing resistance. The position the V.I.V.A. flow vane has no importance.
2.
Before connecting the 2
nd
stage adjustment tool to the 2
nd
stage and without pushing
on the purge, slowly blow through the inlet tube to detect a leak. This information will
indicate or the orifice is in contact (no leak) or not (leak) with the seat.
If a leak is detected, screw the 2
nd
stage adjustment tool to the 2
nd
stage and slowly
screw the orifice one turn clockwise and repeat the test. If there is no leakage, the 2
nd
stage can be adjusted.
3.
Connect the Digi-Mag adapter mouthpiece to the G260 mouthpiece and turn on the
Digi-Mag. Zeroize the Digi-Mag pressure sensor if needed.
4.
Connect the appropriate and well adjusted 1
st
stage to a tank with a minimal filling
pressure of 200 bar, connect the 1
st
stage to the 2
nd
stage adjustment tool with the
L.P. hose and
slowly
open the tank valve.
5. Push
slowly
on the tool adjustment knob and turn slowly the knob to look for the
groove of the orifice.
As soon as the groove is found, slowly unscrew the adjustable orifice - counter
clockwise - until a small leak is detected, then screw in the orifice - just enough
clockwise - to stop the leak.
6.
Cycle the 2
nd
stage 10 times or more by pushing on the purge, then readjust as indi-
cated above.
7.
Inhale slowly through the Digi-Mag and note the cracking effort. It should be between
1,0 to 1,2 inches of water (2,5 to 3,0 milibars).
8.
If the cracking effort is higher then indicated, use the 4
mm Allen key and unscrew by a ¼ turn the fine adjust-
ment screw inside the adjustment knob.
note :
The adjustable orifice
MUST
always be readjusted as per paragraph 5 and 6
before measuring the cracking effort again.
Proceed by successive steps to reach the recommended values(1,0 to 1,2 inches of
water or 2,5 to 3,0 milibars).
