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BS EN IEC 62990-2:2021

BS EN IEC 62990-2:2021

$198.66

Workplace atmospheres – Gas detectors. Selection, installation, use and maintenance of detectors for toxic gases and vapours

Published By Publication Date Number of Pages
BSI 2021 68
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IEC 62990-2:2021 gives guidance on the selection, installation, use and maintenance of electrical equipment used for the measurement of toxic gases and vapours in workplace atmospheres. The primary purpose of such equipment is to ensure safety of personnel and property by providing an indication of the concentration of a toxic gas or vapour and warning of its presence. This document is applicable to equipment whose purpose is to provide an indication, alarm or other output function to give a warning of the presence of a toxic gas or vapour in the atmosphere and in some cases to initiate automatic or manual protective actions. It is applicable to equipment in which the sensor automatically generates an electrical signal when gas is present. For the purposes of this document, equipment includes: a) fixed equipment; b) transportable equipment, and c) portable equipment. This document is intended to cover equipment defined within IEC 62990-1, but can provide useful information for equipment not covered by that document.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7 CONTENTS
9 FOREWORD
11 INTRODUCTION
12 1 Scope
2 Normative references
3 Terms and definitions
16 Figures
Figure 1 – Relationship between indication range and measuring range
Figure 2 – Example of zero uncertainty
17 Figure 3 – Example of warm-up time in clean air
18 4 Properties and detection of toxic gases and vapours
4.1 Properties and detection
19 4.2 The difference between detecting gases and vapours
4.2.1 Gases
20 4.2.2 Vapours
22 4.3 Effects of water vapour on detection
4.4 Effects of temperature and pressure on detection
4.5 Effects of corrosion on detection
4.6 Detection by oxygen deficiency measurement
23 5 Measurement tasks
5.1 General
5.2 Exposure measurement (health monitoring)
24 5.3 General gas detection (safety monitoring)
25 6 Selection of equipment
6.1 General
26 6.2 Performance and electrical tests
6.3 Indication range, measuring range and uncertainty of measurement
6.3.1 General
27 6.3.2 Type HM (Health Monitoring) equipment
6.3.3 Type SM (Safety Monitoring) equipment
6.4 Selectivity requirements
Figure 4 – Relationship between indication range and measuring range
28 6.5 The influence of environmental conditions
6.6 The influence of electromagnetic interference
29 6.7 Time of response and time of recovery
Figure 5 – Gas response curves for test gas volume fractions of 40 ppm and 100 ppm
30 6.8 Time to alarm
6.9 Data logging
Figure 6 – Time to alarm at 25 ppm set point for test gas volume fractionsof 40 ppm and 100 ppm
31 6.10 Instruction manual
7 Design and installation of fixed toxic gas detection equipment
7.1 General
32 7.2 Basic considerations for the installation of fixed systems
33 7.3 Location of detection points
7.3.1 General
7.3.2 General site considerations
34 7.3.3 Site conditions
36 7.3.4 Environmental conditions
38 7.4 Access for calibration and maintenance
7.5 Additional considerations for sample lines
39 7.6 Summary of considerations for the location of sensors or sampling points
40 7.7 Installation of sensors
7.8 Integrity and safety of fixed systems
7.8.1 General
7.8.2 Redundancy in fixed systems
41 7.8.3 Protection against loss of main power supply
7.8.4 Timing of installation during construction operations
7.9 Commissioning
7.9.1 Inspection
42 7.9.2 Initial gas calibration
7.9.3 Adjustment of alarm set points
7.10 Operating instructions, plans and records
43 8 Operation of toxic gas detection equipment
8.1 Alarm setting
44 8.2 Operation of portable equipment
8.2.1 General
45 8.2.2 Electrical protection in explosive atmospheres
8.2.3 Safety of personnel
8.2.4 Spot tests and sampling
8.2.5 Sampling above liquids
46 8.2.6 Avoidance of condensation
8.2.7 Poisoning of sensors
8.2.8 Changes of temperature
8.2.9 Accidental damage
8.2.10 “Read and run” concept
47 8.2.11 Transportation
8.2.12 Storage
8.2.13 Inspection and functional checks
48 8.3 Operation of transportable and fixed equipment
8.3.1 General
49 8.3.2 Commissioning and regular inspection
50 8.4 Sample lines and sampling probes
8.5 Accessories
51 9 Maintenance and calibration
9.1 General
9.2 Sensor
9.2.1 General
9.2.2 Flame arrestor
9.3 Flow systems of aspirated equipment
9.3.1 General
9.3.2 Filters, traps and flame arrestors
9.3.3 Flow system and sample chamber
9.3.4 Flow connections
52 9.3.5 Moving parts
9.3.6 Automatic sample-draw systems
9.3.7 Loss-of-flow signals
9.4 Readout devices
9.4.1 General
9.4.2 Other readouts
9.5 Alarms
9.6 Maintenance
53 9.7 Calibration
9.7.1 Procedure
54 9.7.2 Calibration period
9.8 Operation test
55 9.9 Records
10 Training
10.1 General
10.2 Operator training
56 10.3 Maintenance and calibration training
57 Annex A (informative)Commonly used measurement principles
A.1 General
A.2 Chemiluminescence
Tables
Table A.1 – Chemiluminescence
58 A.3 Colorimetry
Table A.2 – Colorimetry
59 A.4 Electrochemical
Table A.3 – Electrochemical
60 A.5 Flame-ionization
A.6 Gas chromatography
Table A.4 – Flame-ionization
61 A.7 Infrared photometry
Table A.5 – Infrared photometry
62 A.8 Ion mobility spectrometry
Table A.6 – Ion mobility spectrometry
63 A.9 Mass spectrometry
Table A.7 – Mass spectrometry
64 A.10 Photo-ionization
Table A.8 – Photo-ionization (PID)
65 A.11 Semiconductor
Table A.9 – Semiconductor
66 A.12 Ultra-violet/visible photometry
Table A.10 – Ultra-violet/visible photometry
67 Bibliography

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BS EN IEC 62990-2:2021
$198.66