BS 4272-3:1989

Foreword
Committees responsible
Specification
1 Scope
2 Definitions
3 General
4 Connecting yokes for medical gas cylinders
5 Connections for piped medical gas supplies
6 Cylinder and pipeline gauges and indicators
7 Pressure regulators
8 Machine gas piping
9 Machine gas delivery system
10 Rotary flow control valves
11 Flowmeters
12 Gas mixers without monitoring flowmeters for each
    gas
13 General requirements for vaporizers
14 Concentration-calibrated vaporizers
15 Non-calibrated vaporizers
16 Common gas outlet
17 Auxiliary gas outlets
18 Oxygen flush
19 Oxygen supply failure
20 Marking and labelling
21 User instruction manual
Appendices
A Recommendations for cleaning and servicing of
    anaesthetic machines
B Method of test for pressure gauge integrity
C Method of test for leakage from the machine gas
    piping
D Method of test for cross-contamination
E Method of test for leakage from the machine gas
    delivery system
F Method of test for vaporizer accuracy
G Method of filling the vaporizer prior to testing for
    liquid discharge
H Method of test for average delivered concentration
    of anaesthetic vapour from the vaporizer
Tables
1 Test torque values for flow control valve knob
2 Settings to be used for testing vaporizer accuracy
Figures
1 Profile of oxygen flow control knob
2 Auxiliary gas outlet probe for oxygen
3 Auxiliary gas outlet probe for air
4 Test apparatus for determining cross-contamination
5 Test apparatus for determining leakage from the
    machine gas delivery system

Basic design and performance requirements.