SIGMA 2
3
Cylinder Types Water
Volume
(litres)
Charging
Pressure
Free Air
Volume
(litres)
Nominal
Duration
(minutes)
Warning
Period
(minutes)
Total
Duration
(minutes)
Cylinder
Charged
Weight
(Kg)
CYL-1200 6.0 207 1200 22 8 30 8.8
CYL-HWG-1200 6.0 207 1200 22 8 30 7.2
CYL-FWC-1300 4.7 300 1300 25 7 32 5.0
CYL-1640 6.0 300 1640 33 8 41 12.5
CYL-HWG-1640 6.0 300 1640 33 8 41 10.0
CYL-FWC-1640 6.0 300 1640 33 8 41 6.3
CYL-1800 9.0 207 1800 33 12 45 13.0
CYL-HWG-1800 9.0 207 1800 33 12 45 11.2
CYL-FWC-1800 9.0 207 1800 33 12 45 6.75
CYL-FWC-1860 6.8 300 1860 37 9 46 6.75
CYL-2240 11.0 207 2240 41 15 56 14.4
CYL-FWC-2460 9.0 300 2460 50 12 62 8.8
Table 2: Cylinders approved for use with SIGMA 2
Cylinder Material is identified by codes within the Cylinder Type. Table 3 identifies the
meaning of the cylinder material code and the specification to which the cylinder is
manufactured:
Code Material Specification
No Code Steel (e.g.: CYL-1200) BS5045 Pt.1
HWG Hoop Wrapped Glass Fibre (e.g.: CYL-HWG-1200) HSE-AL-HW1
FWC Fully Wrapped Carbon (e.g.: CYL-FWC-1300) HSE-AL-FW2
Table 3: Cylinder Codes and Specifications
Durations are nominal and based on an Average Wearer Consumption Rate of 40 L/min and
are for fully charged cylinders.
Total Duration =
Cylinder Free Air Capacity
Average Wearer Consumption Rate
Nominal Duration =
Total Duration minus the Warning Period.
Warning Period =
Cylinder Water Capacity x Whistle Operating Pressure
Average Wearer Consumption Rate
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