MSA S-Cap-Air Maintenance Manual page 6

2 Charging and Packing
2.1 Charging the Air Cylinder
NOTICE! Air used to charge cylinders must conform to EN 12021 or USCGA grade
D (or better). High pressure compressors and charging appliances must
only be used by trained operators and all safety procedures must be ob-
served.
1. Break tamper tag or remove remnants of it (if necessary), open bag zipper entirely.
2. Remove hood, uncover the valve and check that the firing pin is in place [the top of the
pin is parallel in line with the hose connection] and the valve is closed [cap hand
screwed in position]
3. Prior to the filling procedure the bust disc should be checked for right torque. The re-
taining screw is fitted with a locking force of 5,9 ±0,3 Nm torque
4. Remove the dust cap from the charging port of cylinder valve.
Connect charging port to a standard 200 bar compressor outlet, charge the cylinder to
207 bar. After charging allow cylinder to cool down and top up the cylinder if necessary.
(Observe compressor instructions, if required, use country specific adapter)
Note: There is a restrictor inside the filling port. This may cause repeated filling cycles
of the compressor - depending on the capacity of the compressor – to reach the re-
quired 207 bar. Compressors with a high capacity fill the cylinder and the filling system
quickly. The safety pressure switch will turn off the compressor at a maximum of ap-
proximately 220 bar. The pressure inside the cylinder then, needs to balance with the
pressure in the system. This causes a pressure drop inside the system so the proce-
dure must be repeated until the cylinder and the filling system balance at 207 bar.
5. After charging, open air cylinder valve briefly by turning open the valve cap, close again
immediately until the air flow stops. Then turn in another 60° (see pictures below). Now
the firing pin must be in line with the hose connection. If it is not, turn valve cap loose
again, pull firing pin out and put it back into the cap on the opposite side. Then close
the valve again as explained above.
60° Gauge (paper-version)
Cutout sample at the end of this manual.
Note: The additional turn of 60° beyond the valve closing point [air flow stops] assures
a properly and tightly closed valve. Turning the cap through greater angles may result
in excessively high pull out forces for the firing pin.
Check the cylinder pressure and top up if necessary [normally this is not required].
6. After the cylinder is fully charged, depressurize the compressor outlet, and loosen the
pressure free connection (remove adapter possibly used).
6
60° Gauge (tool order no. 10045531)