IEC TR 61831:2011

On-line analyser systems - Guide to design and installation

IEC 61831:2011(E) is a guide applicable to on-line analyser systems. It provides the necessary guidance for the system supplier and user to specify or design a complete analyser system from sample point in the process to the final output for display or control purposes. This second edition cancels and replaces the first edition published in 1999. This edition constitutes a technical revision. The main changes with respect to the previous edition are:
- Updated references;
- Made consistent with current practices and regulations;
- Incorporating new technologies where applicable.

General Information

• Status: Published
• Publication Date: 18-Aug-2011
• ICS: 13.040 - Air quality
• ICS: 13.060 - Water quality
• ICS: 17.020 - Metrology and measurement in general
• Technical Committee: SC 65B - Measurement and control devices
• Drafting Committee: WG 14 - TC 65/SC 65B/WG 14
• Current Stage: PPUB - Publication issued
• Start Date: 31-Oct-2011
• Completion Date: 19-Aug-2011

Relations

• Revises: IEC TR 61831:1999 - On-line analyser systems - Guide to design and installation
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC/TR 61831 ®
Edition 2.0 2011-08
TECHNICAL
REPORT
On-line analyser systems – Guide to design and installation

IEC/TR 61831:2011(E)
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IEC/TR 61831 ®
Edition 2.0 2011-08
TECHNICAL
REPORT
On-line analyser systems – Guide to design and installation

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XB
ICS 13.040; 13.060; 17.020 ISBN 978-2-88912-633-0
– 2 – TR 61831 © IEC:2011(E)
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Remarks and considerations. 9
4.1 General remarks. 9
4.2 Further considerations . 9
4.3 Reliability . 10
4.4 Design . 10
4.5 Centralisation . 10
4.6 Local mounting . 10
4.7 Pre-assembled systems . 10
5 Health, safety and environmental considerations . 11
5.1 Overview . 11
5.2 Prevention of explosions and fires . 11
5.3 Prevention of toxic and asphyxiant hazards . 11
5.4 Radiation hazards . 12
5.5 Safety facilities . 12
5.6 Manual shut-down facilities . 12
5.7 Noise . 12
6 Housings . 12
6.1 Overview . 12
6.2 Selection of housing . 13
6.2.1 Analyser case . 13
6.2.2 Analyser cabinet . 13
6.2.3 Analyser shelter . 13
6.2.4 Analyser house . 14
6.3 Area classification and toxic danger . 14
6.3.1 Electrical area classification . 14
6.3.2 Toxic and asphyxiate danger . 14
6.4 Construction and mounting . 14
6.4.1 General . 14
6.4.2 Analyser housings . 15
6.4.3 Analyser houses . 15
6.4.4 Analyser shelters . 15
6.5 Analyser housings with natural ventilation . 16
6.5.1 General . 16
6.5.2 Ventilation requirements . 16
6.5.3 Heating requirements . 16
6.5.4 Analyser shelters . 17
6.5.5 Analyser cases . 17
6.6 Analyser housings with forced ventilation . 17
6.6.1 General . 17
6.6.2 Ventilation requirements . 17
6.6.3 Air intake system . 17

TR 61831 © IEC:2011(E) – 3 –
6.6.4 Ventilation fan requirements . 17
6.6.5 Airflow requirements . 18
6.6.6 Heating requirements . 18
6.6.7 Safety monitors and alarms . 18
7 Sampling systems . 21
7.1 Overview . 21
7.2 Sample system terminology . 22
7.3 General requirements . 22
7.4 Sample point location . 23
7.5 Fast circulating systems (fast loops) . 24
7.6 By-pass systems . 24
7.7 Sample recovery systems . 24
7.8 Special considerations . 25
7.9 Multi-stream systems . 25
7.10 Construction . 26
7.10.1 General . 26
7.10.2 Material selection . 26
7.10.3 Flushing facilities . 27
7.10.4 Blockage removal . 27
7.10.5 Heat tracing and insulation . 27
7.10.6 Minimising risks from leakage . 28
7.10.7 Location of equipment . 28
7.10.8 Instrumentation. 28
7.10.9 Identification . 28
7.11 Effluent disposal . 29
7.11.1 General . 29
7.11.2 Vapour . 29
7.11.3 Liquid . 29
7.12 Calibration facilities . 30
7.13 Automatic calibration . 30
8 Analyser communications . 31
8.1 Overview . 31
8.2 Signal transmission . 31
8.3 Safety . 32
8.4 Cables . 33
8.5 Use of signal . 33
8.6 Alarms . 33
Annex A (informative) Typical analyser process line sampling probe for line sizes NPS
2" and above . 34
Annex B (informative) Determination of sample probe lengths . 35
Annex C (informative) Sample system calculations . 43
Annex D (informative) Natural ventilation calculations . 56
Annex E (informative) Forced ventilation calculations . 62
Annex F (informative) Example of verification/calibration sequence of data to
computer . 63
Annex G (informative) Analyser house with forced ventilation – Summary of
recommended control shut-down actions for flammable hazard operation . 64

– 4 – TR 61831 © IEC:2011(E)
Annex H (informative) Analyser houses with forced ventilation – Ventilation failure and
flammable gas detection trip logic . 65
Annex I (informative) Typical analyser system schematics . 67
Annex J (informative) Example schematic showing a typical wall penetration
...