BS EN 45544-4:2016 – TC:2020 Edition
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Tracked Changes. Workplace atmospheres. Electrical apparatus used for the direct detection and direct concentration measurement of toxic gases and vapours – Guide for selection, installation, use and maintenance
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 147 |
This European Standard gives guidance on the selection, installation, use and maintenance of electrical apparatus used for the direct detection and direct concentration measurement of toxic gases and vapours in workplace atmospheres. The primary purpose of such apparatus is to measure the concentration of a toxic gas or vapour in order to provide an exposure measurement and/or detection and warning of its presence. This European Standard is applicable to apparatus whose primary purpose is to provide an indication, alarm and/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 apparatus in which the sensor automatically generates an electrical signal when gas is present. This European Standard is not applicable, but may provide useful information, for apparatus — used for the measurement of oxygen, — used only in laboratories for analysis or measurement, — used only for process measurement purposes, — used in car parks or tunnels (fixed apparatus only), — used in the domestic environment, — used in environmental air pollution monitoring, — used for the measurement of combustible gases and vapours related to the risk of explosion. It also does not apply to open-path (line of sight) area monitors. For apparatus used for sensing the presence of multiple gases, this European Standard applies only to the detection of toxic gas or vapour.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 99 | Contents Page |
| 101 | European foreword |
| 102 | Introduction |
| 103 | 1 Scope 2 Normative references |
| 104 | 3 Terms and definitions |
| 108 | Figure 1 — Example of warm-up time in clean air |
| 109 | 4 Properties and detection of toxic gases and vapours 4.1 Properties and detection |
| 110 | 4.2 Effects of water vapour on detection 4.3 Detection by oxygen deficiency measurement |
| 111 | 5 Measurement tasks 5.1 General 5.2 General gas detection |
| 112 | 5.3 Exposure measurement |
| 113 | 6 Selection of the apparatus 6.1 General |
| 114 | 6.2 Performance and electrical tests 6.3 Indication range, measuring range and uncertainty of measurement 6.3.1 General |
| 115 | Figure 2 — Apparatus scale showing ranges, indications and limits 6.3.2 Apparatus conforming to EN 45544-2 Figure 3 — Example of zero uncertainty Table 1 — Expanded uncertainty requirements for apparatus conforming to EN 45544-2 for measurements for comparison with limit values and periodic measurements |
| 116 | 6.3.3 Apparatus conforming to EN 45544-3 6.4 Selectivity requirements 6.5 The influence of environmental conditions 6.6 Time of response and time of recovery |
| 117 | Figure 4 — Gas response curves for test gas volume fractions of 40 ppm and 100 ppm 6.7 Time to alarm |
| 118 | Figure 5 — Time to alarm at 25 ppm set point for test gas volume fractions of 40 ppm and 100 ppm 6.8 Data logging |
| 119 | 6.9 Instruction manual 7 Operation of toxic gas detection apparatus 7.1 Alarm setting |
| 120 | 7.2 Operation of personal and portable apparatus 7.2.1 General |
| 121 | 7.2.2 Transportation 7.2.3 Storage 7.2.4 Inspection and functional checks |
| 122 | 7.3 Operation of transportable and fixed apparatus 7.3.1 General |
| 123 | 7.3.2 Installation |
| 124 | 7.3.3 Commissioning and regular inspection 7.3.3.1 General 7.3.3.2 Commissioning and initial calibration 7.3.3.3 Regular inspection |
| 125 | 7.4 Sample lines and sampling probes 7.5 Accessories |
| 126 | 8 Maintenance and calibration 8.1 General 8.2 Maintenance 8.3 Calibration 8.3.1 Procedure |
| 127 | 8.3.2 Calibration period |
| 128 | 8.4 Operation test 8.5 Records |
| 129 | 9 Training 9.1 General 9.2 Operator training 9.3 Maintenance and calibration training |
| 131 | Annex A (normative) Commonly used measurement principles A.1 General A.2 Chemiluminescence Table A.1 — Chemiluminescence |
| 132 | A.3 Colorimetry Table A.2 — Colorimetry |
| 133 | A.4 Electrochemical Table A.3 — Electrochemical |
| 134 | A.5 Flame-ionization Table A.4 — Flame-ionization |
| 135 | A.6 Gas chromatography Table A.5 — Gas chromatography |
| 136 | A.7 Infrared photometry Table A.6 — Infrared photometry |
| 137 | A.8 Ion mobility spectrometry Table A.7 — Ion mobility spectrometry |
| 138 | A.9 Mass spectrometry Table A.8 — Mass spectrometry |
| 139 | A.10 Photo-ionization Table A.9 — Photo-ionization (PID) |
| 140 | A.11 Semiconductor Table A.10 — Semiconductor |
| 141 | A.12 Ultra-violet visible photometry Table A.11 — Ultra-violet/visible photometry |
| 142 | Annex B (informative) Table of significant changes in comparison to EN 45544-4:1999 |
| 144 | Bibliography |
