NEN EN 50104 : 2010

1 Scope
2 Normative references
3 Definitions
  3.1 Gas properties
  3.2 Types of instruments
  3.3 Sensors
  3.4 Supply of gas to instrument
  3.5 Signals and alarms
  3.6 Times
4 General requirements
  4.1 Introduction
  4.2 Construction
      4.2.1 General
      4.2.2 Indicating devices
      4.2.3 Alarm or output functions
      4.2.4 Fault signal
      4.2.5 Adjustments
      4.2.6 Battery-powered apparatus
      4.2.7 Software-controlled apparatus
5 Test methods
  5.1 Introduction
  5.2 General requirements for tests
      5.2.1 Samples and sequence of tests
      5.2.2 Preparation of apparatus before testing
      5.2.3 Mask for calibration and test
  5.3 Normal conditions for test
      5.3.1 General
      5.3.2 Test gas(es)
      5.3.3 Flow rate for test gases
      5.3.4 Voltage
      5.3.5 Ambient temperature
      5.3.6 Pressure
      5.3.7 Humidity
      5.3.8 Stabilisation time
      5.3.9 Orientation
  5.4 Test methods and performance requirements
      5.4.1 General
      5.4.2 Unpowered storage of the apparatus
      5.4.3 Calibration, adjustment and repeatability
      5.4.4 Drift (continuous duty apparatus only)
      5.4.5 Stability (spot-reading apparatus only)
      5.4.6 Alarm set point(s)
      5.4.7 Temperature
      5.4.8 Pressure
      5.4.9 Humidity
      5.4.10 Air velocity
      5.4.11 Flow rate
      5.4.12 Orientation
      5.4.13 Vibration
      5.4.14 Drop test
      5.4.15 Warm-up time (not applicable to spot-reading
             apparatus)
      5.4.16 Time of response
      5.4.17 Minimum time to operate (spot-reading
             apparatus)
      5.4.18 Battery capacity
      5.4.19 Power supply variations
      5.4.20 Electromagnetic compatibility
      5.4.21 Addition of sampling probe
      5.4.22 Dust (for apparatus where the atmosphere is
             sampled by diffusion only)
      5.4.23 Poisons and other gases
      5.4.24 Field verification kit
6 Information for use
  6.1 Labelling and marking
  6.2 Instruction manual
Annex A (informative) Sequence of tests
Annex B (informative) Bibliography

Defines general requirements for construction, testing and performance, and describes the test methods that apply to portable, transportable and fixed apparatus for the measurement of the oxygen concentration in gas mixtures indicating up to 25% (v/v).