BS EN 401:1993

Cooperating organizations
National foreword
Foreword
Specification
Introduction
1. Scope
2. Normative references
3. Definitions and description
4. Classification
5. Requirements
6. Testing
7. Instructions for use
8. Marking
Annexes
A. (normative) Additional requirement for apparatus
     designed for special use
B. (normative) Methods of measurement of the insulation
     resistance of the carrying container
Tables
1. Test conditions
Figures
1. Test piece with painted electrodes
2. Apparatus for testing of flammability
3. Test equipment for mechanical strength
4. Scheme of relief valve leakage test box
5. Scheme of test rig for valve leakage using a
     single cylinder breathing machine
6. Scheme of test rig for relief valve leakage using
     a twin cylinder breathing machinei
7. Scheme of test rig for chemical oxygen (KO2) escape
     apparatus
8. Cooler
9. Humidifier
10. Dummy head for apparatus with permanently connected
     full face mask
11. Connector for apparatus having a permanently
     connected mouthpiece assembly
B.1 Current measurement by microammeter or galvanometer
B.2 (a) Current measurement by means of a d.c. amplifier
B.2 (b) Current measurement by means of a d.c. amplifier
B.3 (a) Determination of the ratio of currents when the
          same voltage is applied successively to the two
          resistances
B.3 (b) Wheatstone bridge method
National annexes
National annex NA (informative) Committees responsible
National annex NB (informative) Cross-references