ISO 23431:2021
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ISO 23431:2021
75571

Abstract

 Preview

This document describes methods for determining air speed and flow direction, CO, NO and NO2 concentrations and visibility in road tunnels using direct-reading instruments. This document specifically excludes requirements relating to instrument conformance testing.


General information 

  •  :  Published
     : 2021-03
  •  : 1
     : 31
  •  : ISO/TC 146/SC 3 Ambient atmospheres
  •  :
    93.060 Tunnel construction
    13.040.20 Ambient atmospheres

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