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BS EN IEC 62990-1:2022+A11:2022:2023 Edition

BS EN IEC 62990-1:2022+A11:2022:2023 Edition

$198.66

Workplace atmospheres – Gas detectors. Performance requirements of detectors for toxic gases

Published By Publication Date Number of Pages
BSI 2023 68
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PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
6 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
9 FOREWORD
11 INTRODUCTION
12 1 Scope
13 2 Normative references
3 Terms and definitions
19 Figures
Figure 1 – Relationship between indication range and measuring range
20 Figure 2 – Warm-up time in clean air (typical)
Figure 3 – Warm-up time in standard test gas (typical)
21 4 General requirements
4.1 Overview
Figure 4 – Example of zero uncertainty
22 4.2 Design
4.2.1 General
4.2.2 Indicating devices
24 4.2.3 Alarm signal
4.2.4 Fault signals
25 4.2.5 Adjustments
4.2.6 Battery-powered equipment
4.2.7 Gas detection transmitter for use with separate gas detection control units
26 4.2.8 Separate gas detection control units for use with gas detection transmitter(s)
4.2.9 Software-controlled equipment
27 4.3 Labelling and marking
28 4.4 Instruction manual
30 5 Test methods
5.1 General
31 5.2 General requirements for tests
5.2.1 Samples and sequence of tests
32 5.2.2 Preparation of equipment before each test
33 5.2.3 Mask for calibration and test
5.3 Normal conditions for test
5.3.1 General
5.3.2 Test gas(es)
5.3.3 Flow rate for test gases
34 5.3.4 Power supply
5.3.5 Temperature
5.3.6 Pressure
5.3.7 Humidity
5.3.8 Acclimation time
5.3.9 Orientation
5.3.10 Communications options
35 5.3.11 Gas detection equipment as part of systems
5.4 Tests
5.4.1 General
5.4.2 Unpowered storage
36 5.4.3 Measurement of deviations
5.4.4 Mechanical tests
38 5.4.5 Environmental tests
41 5.4.6 Performance tests
46 5.4.7 Electrical tests
49 5.4.8 Stability
50 5.4.9 Fault signal tests
51 5.4.10 Software controlled equipment
5.4.11 Protection against water
52 6 Uncertainty of measurement and lower limit of measurement for type HM equipment
6.1 General
6.2 Method of calculation of uncertainty of measurement
6.2.1 Basic concept
53 6.2.2 Sources of uncertainty
Table 1 – Factors to be considered in the expanded uncertainty estimate
58 6.2.3 Calculation of relative expanded uncertainty
59 6.3 Method of calculation of lower limit of measurement
60 6.4 Acceptance criteria
6.4.1 Uncertainty of measurement
6.4.2 Lower limit of measurement
6.5 Relation between uncertainty and accuracy
61 Annex A (normative)Gas specific performance requirements
Table A.1 – Gas specific performance requirements
62 Annex B (informative)Determination of time of response and time of recovery
B.1 Aspirated equipment
B.1.1 Test rig
B.1.2 Equipment without internal pump
B.1.3 Equipment with internal pump
63 B.2 Equipment that samples by diffusion
B.2.1 Calibration mask method
B.2.2 Diffusion or flow methods
Figure B.1 – Schematic example of test rig for use with aspirated equipment
64 Figure B.2 – Schematic example of test chamber for diffusion method
Figure B.3 – Schematic example of test chamber for flow method
65 Bibliography

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BS EN IEC 62990-1:2022+A11:2022
$198.66