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BS ISO 23431:2021

BS ISO 23431:2021

$167.15

Measurement of road tunnel air quality

Published By Publication Date Number of Pages
BSI 2021 40
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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.

PDF Catalog

PDF Pages PDF Title
2 National foreword
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
11 4 Test parameter ā€” Air speed and flow direction
4.1 General
4.2 Principle
12 4.3 Apparatus
4.3.1 Instrument
4.3.2 Reference path length measurement device (open path instruments only)
4.3.3 Transfer standard flow sensor
4.4 Procedure
13 4.5 Instrument checks and calibrations
4.5.1 General
4.5.2 Measurement path length (open path instruments only)
4.5.3 Initial check
14 4.5.4 Cross-section calibration
4.5.5 Zero check
15 4.5.6 System component check
4.5.7 Operational precision check
16 4.6 Maintenance
4.6.1 General
4.6.2 On site checks
4.7 Calculation and expression of results
17 4.8 Measurement uncertainty
5 Test parameters ā€” Carbon monoxide, nitric oxide and nitrogen dioxide
5.1 General
5.2 Principle
18 5.3 Apparatus
5.3.1 Instrument
19 5.3.2 Reference barometer
5.3.3 Reference thermometer
5.3.4 Reference path length measurement device (for open path instruments only)
5.3.5 Reference flow through calibration cell length measurement device (for open path instruments only)
20 5.4 Procedure
5.4.1 Open path instruments
5.4.2 Single point instruments
21 5.5 Instrument checks and calibrations
5.5.1 General
5.5.2 Open path instruments
22 5.5.3 Single point instruments
23 5.5.4 Measurement path length (for open path instruments only)
5.5.5 Flow through calibration cell length (for open path instruments only)
5.5.6 Temperature and pressure checks
5.5.7 Zero air
5.5.8 Reference test atmosphere
24 5.5.9 Zero check
5.5.10 Zero calibration
25 5.5.11 Span check
5.5.12 Span calibration
26 5.5.13 Multipoint precision check
5.5.14 System component check
27 5.6 Maintenance
5.6.1 General
5.6.2 Cleaning of optical interfaces
5.6.3 Light source/electrochemical cell replacement
5.6.4 Optical alignment
28 5.7 Calculation and expression of results
5.8 Measurement uncertainty
6 Testing parameter ā€” visibility
6.1 General
6.2 Principle
30 6.3 Apparatus
6.3.1 Instrument
6.3.2 Reference path length measurement device
6.4 Procedure
6.4.1 Transmissometer
31 6.4.2 Scattered light instrument
32 6.5 Instrument checks and calibrations
6.5.1 General
6.5.2 Zero check
6.5.3 Span check
33 6.5.4 Zero and span calibration
6.5.5 Multipoint precision check
6.5.6 System component check
34 6.6 Maintenance
6.6.1 General
6.6.2 Cleaning of optical interfaces
6.6.3 Light source replacement
6.6.4 Transmissometer optical alignment
35 6.7 Calculation and expression of results
6.8 Measurement uncertainty
7 Quality assurance and control
7.1 General
7.2 Instrument log
36 7.3 Data acquisition and transfer
7.4 Data validation
8 Test report
38 Bibliography

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BS ISO 23431:2021
$167.15