4.2 Gas Supplies
Cylinders: A maximum of four cylinder fittings can be specified
All cylinder yokes are pin-indexed
Fourth Gas Options: Carbon dioxide, Helium, Xenon
Pipeline: Maximum of three (oxygen, nitrous oxide, air).
All specifications to relevant national standards.
Medical gas colour codes:
Oxygen Green or White*
Nitrous oxide Blue
Medical air Yellow or Black/White*
Carbon dioxide Grey
Helium Brown
Xenon Green (bright)
*To comply with relevant national standards.
Internal pipework is diameter indexed for each gas:
Oxygen 8 mm Carbon Dioxide 4 mm
Nitrous oxide 6 mm Helium 4 mm
Air 5 mm Xenon 4 mm
Mixed gas 10 mm
4.3 Flowmeters
Flow ranges:
Single flow tubes:
Oxygen: 0 - 10 L/min
Nitrous Oxide: 0 - 10 L/min
Air 0 - 10 L/min
Helium 0 - 10 L/min
Cascade flow tubes:
Oxygen / Air / Nitrous Oxide (1) 0 - 1000 ml/min
(2) 0 - 10 L/min (graduated 1 - 10 L/min)
Flowmeter Accuracy
The accuracy of the flowmeter tubes is ± 2.5% of full scale reading.
Flowmeter construction and dimensions
Tubes and floats are matched, and must not be interchanged.
Flowmeter tubes have antistatic coatings.
Tubes are length indexed:
Oxygen 260 mm (10.24 inch)
Nitrous oxide 250 mm (9.84 inch)
Other gases 240 mm (9.45 inch) (see 3.12)
Scale length 152 mm (6 inch) minimum
(all tubes except carbon dioxide)
15
SPECIFICATION
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