NEN EN 50056 : 1998

Foreword
1 Scope
2 Normative reference
3 Definitions
4 General requirements
5 Performance requirements
5.1 General
5.2 Unpowered storage
5.3 Calibration curve (not applicable to alarm-only
      apparatus)
5.4 Drift (continuous duty apparatus)
5.5 Drift (spot reading apparatus)
5.6 Alarm
5.7 Temperature
5.8 Pressure
5.9 Humidity
5.10 Air speed
5.11 Pumping rate
5.12 Orientation
5.13 Vibration (applicable only to machine-mounted
      apparatus)
5.14 Drop test (applicable to portable apparatus and
      remote sensors)
5.15 Warm-up time (not applicable to spot-reading
      apparatus)
5.16 Time of response (not applicable to spot-reading
      apparatus)
5.17 Minimum time of operation (spot reading apparatus)
5.18 High gas concentrations above the measuring range
5.19 Battery capacity
5.20 Power supply variations
5.21 Power supply interruptions, voltage transients and
      step changes of voltage
5.22 Addition of sampling probe
5.23 Dust
5.24 Poisons and other gases
5.25 Electromagnetic immunity
6 Field calibration kit
7 Information for use

Describes performance requirements for Group I (as defined in European Standard EN 50054) portable, transportable and fixed apparatus for detection and measurement of methane concentrations in mine air. The apparatus, or parts thereof, are designed for use in mines susceptible to firedamp and comply with requirements and test methods specified in European Standard EN 50054. Limited to apparatus detection and measurement of volume ratios of methane in air from 0% (V/V) up to 100% (V/V).