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BS IEC 62990-1:2019:2020 Edition

BS IEC 62990-1:2019:2020 Edition

$198.66

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

Published By Publication Date Number of Pages
BSI 2020 64
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This part of IEC 62990 specifies general requirements for design, function and performance, and describes the test methods that apply to portable, transportable, and fixed equipment for the detection and concentration measurement of toxic gases and vapours in workplace atmospheres and other industrial and commercial applications.

This document is applicable to continuously sensing equipment whose primary purpose is to provide an indication, alarm and/or other output function the purpose of which is to indicate the presence of a toxic gas or vapour in the atmosphere and in some cases to initiate automatic or manual protective action(s). It is applicable to equipment in which the sensor generates an electrical signal when gas is present.

This document applies to two types of equipment:

  • Type HM (Health Monitoring) ‘occupational exposure’ equipment:

    For occupational exposure measurement, the performance requirements are focused on uncertainty of measurement of gas concentrations in the region of Occupational Exposure Limit Values (OELV). The upper limit of measurement will be defined by the manufacturer in accordance with 4.2.1.

  • Type SM (Safety Monitoring) ‘general gas detection’ equipment:

For general gas detection applications (e.g. safety warning, leak detection), the performance requirements are focused on alarm signalling. The upper limit of measurement will be defined by the manufacturer according to the intended use of the equipment.

In general, the requirements for accuracy will be higher for Type HM equipment than for Type SM equipment. The same equipment may meet the requirements of both Type HM and Type SM.

For equipment used for sensing the presence of multiple gases this document applies only to the detection of toxic gas or vapour.

This document is not applicable to equipment:

  • with samplers and concentrators such as sorbents or paper tape having an irreversible indication;

  • used for the measurement of gases and vapours related to the risk of explosion;

  • used for the measurement of oxygen;

  • used only in laboratories for analysis or measurement;

  • used only for process measurement purposes;

  • used in the domestic environment;

  • used in environmental air pollution monitoring;

  • used for open-path (line of sight) area gas measurement;

  • used for ventilation control in car parks or tunnels.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 English
CONTENTS
6 FOREWORD
8 INTRODUCTION
9 1 Scope
10 2 Normative references
3 Terms and definitions
16 Figures
Figure 1 – Relationship between indication range and measuring range
17 Figure 2 – Warm-up time in clean air (typical)
Figure 3 – Warm-up time in standard test gas (typical)
18 4 General requirements
4.1 Overview
Figure 4 – Example of zero uncertainty
19 4.2 Design
4.2.1 General
4.2.2 Indicating devices
21 4.2.3 Alarm signal
4.2.4 Fault signals
22 4.2.5 Adjustments
4.2.6 Battery-powered equipment
4.2.7 Gas detection transmitter for use with separate gas detection control units
23 4.2.8 Separate gas detection control units for use with gas detection transmitter(s)
4.2.9 Software-controlled equipment
24 4.3 Labelling and marking
25 4.4 Instruction manual
27 5 Test methods
5.1 General
28 5.2 General requirements for tests
5.2.1 Samples and sequence of tests
29 5.2.2 Preparation of equipment before each test
30 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
31 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
32 5.3.11 Gas detection equipment as part of systems
5.4 Tests
5.4.1 General
5.4.2 Unpowered storage
33 5.4.3 Measurement of deviations
5.4.4 Mechanical tests
35 5.4.5 Environmental tests
38 5.4.6 Performance tests
43 5.4.7 Electrical tests
46 5.4.8 Stability
47 5.4.9 Fault signal tests
48 5.4.10 Software controlled equipment
5.4.11 Protection against water
49 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
50 6.2.2 Sources of uncertainty
Table 1 – Factors to be considered in the expanded uncertainty estimate
55 6.2.3 Calculation of relative expanded uncertainty
56 6.3 Method of calculation of lower limit of measurement
57 6.4 Acceptance criteria
6.4.1 Uncertainty of measurement
6.4.2 Lower limit of measurement
6.5 Relation between uncertainty and accuracy
58 Annex A (normative)Gas specific performance requirements
Table A.1 – Gas specific performance requirements
59 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
60 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
61 Figure B.2 – Schematic example of test chamber for diffusion method
Figure B.3 – Schematic example of test chamber for flow method
62 Bibliography

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BS IEC 62990-1:2019
$198.66