JFD B44771, Operation And Maintenance Manual, Page: 72 / 136

60 OM131
Chapter 4 P1939-OM-131 R11
4.3.2.3 Check scrubber canister seal
Check the condition of the scrubber canister sealing gasket (Fig 3.7, Item 2, page 48) inside the
CO
2
scrubber housing. Replace it if damage is observed.
See Section 4.5.2.2, notes 8. to 13.
4.3.2.4 Check operation of two stage regulator
1. Ensure that the gas cylinders are empty by activating the SLS System and pressing down on
the demand valve diaphragm with the demand valve activating tool (Divex Part No M2922)
from the Tool and Test Kit.
2. Remove the blanking plug from the single stage regulator test port and insert the test gauge
(Divex Part No DM32540) from the Tool and Test Kit.
3. Reset the spool valve to close it.
4. Charge the SLS System to at least 150 bar with breathing quality AIR.
5. Insert the flowmeter connector (Divex Part No. DM32580) from the Tool and Test Kit into the
main supply penetrator on the inside of the CO
2
Scrubber Housing.
6. Actuate the spool valve by pressing on it.
7. Check that the pressure gauge reads between 0.96 and 1.03 bar (14 and 15 psi) and that the
centre of the flowmeter ball lies between the red bands on the flowmeter (3.7 - 4.8 L/min).
8. If not slacken the locknut (Fig 4.7, Item 22) and using the allen key provided move the
regulator adjustment screw (Fig 4.7, Item 23) until the settings are correct. Tighten the locknut
(Fig 4.7, Item 22) to lock this setting.
9. If it is not possible to achieve the flow rate when the regulator pressure is correctly set, then
the injection orifice penetrator should be removed and either ultrasonically cleaned or
replaced.
10. Reset the spool valve. Blank off the end of the injection orifice with a finger and check that the
test gauge remains at zero. If gauge reading increases the 1st stage piston o-rings or the
spool valve o-rings are damaged and must be replaced.
N
OTE
Always fully discharge the air from the SLS System immediately after completing the above
procedure.
4.3.2.5 Check operation of single stage regulator
N
OTE
This should be done with the supply hose connected to the Helmet to ensure that the single stage
regulator inlet filter and the helmet side-block connector filter are not contaminated and restricting
the flow.
1. Connect the SLS System Backpack single stage regulator hose to the SLS System Helmet
sideblock and connect an AIR supply to the helmet.
2. Remove the blanking plug from the first stage regulator test port and insert the test gauge
(Divex Part No. DM32540) from the Tool and Test Kit.
3. Remove the scrubber door and CO
2
scrubber canister.