SCUBAPRO-UWATEC MK17 - Adjustment Phase; Preparation for Adjustment; Pressure Observation and Cycling; Interstage Pressure Adjustment

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MK17 revision may 2005 7 / 7

THE 1

STAGE IS NOW READY FOR THE ADJUSTMENT PHASE.

ADJUSTMENT

FOR THE ADJUSTMENT, IT IS VERY IMPORTANT TO HAVE A SUPPLY PRESSURE

CURRENTLY USED FOR DIVING WITH THE REGULATOR CONCERNED ( 200, 230 or

300 bars ).

1. Place the 1

stage on a full tank as previously indicated.

2. Place a precise interstage pressure gauge either at one of the interstage pressure

ports or at the end of the regulator hose

Warning ! : The gauge found on the adjustment tool is not precise enough because

of it's small size and should not be used as a workshop gauge. A bigger size and

more precise gauge should be used in a repair workshop.

3. Slowly open the tank valve.

4. Observe carefully the needle of the gauge that should move in a very smooth way

before coming to a sharp stop. Cycle the regulator about 10 times by purging the 2

stage. This is to allow all the moving internal parts to reach their permanent working

position.

5. Take note of the interstage pressure when the needle of the gauge comes to a stop.

Three cases can occur:

 the interstage pressure is in between 9 and 10 bars

 the interstage pressure is lower than 9 bars

 the interstage pressure is higher than 10 bars

6. If the gauge indicates an interstage pressure between 9 and 10 bars with a good sta-

bility of the needle of the gauge, a good adjustment has been reached.

7. If the interstage pressure is less than 9 bars, use a 6 mm Allen key to slowly screw

(clockwise) the adjustment screw. Every time the adjustment screw is turned, the

regulator should be cycled about 10 times before a reading of the interstage pressure

is taken. Proceed by 1/4 turn to reach the correct setting which should be in between

9 and 10 bars.

8. If the interstage pressure is higher than 10 bars, proceed as above but unscrew (an-

ticlockwise) the adjustment screw to reach the correct setting.

9. If after several unsuccessful attempts in reaching a stable interstage pressure,

change the diaphragm.

Note: As we previously carried out the leak test between the HP orifice and

seat, a bad interstage pressure lock does not come from these parts. A distort-

ed diaphragm is often responsible for a poor interstage pressure lock!!!