IEC TR 61831:2011 pdfダウンロード

IEC TR 61831:2011 pdfダウンロード。On-line analyser systems – Guide to design and installation
Scope
This technical report is a quide applicable to on-line analyser systems. lt provides thenecessary guidance for the system supplier and user to specify or design a complete analysersystem from sample point in the process to the final output for display or control purposes.
2Normative references
IEC 61285:2004.Industrial-process control – Safety of analyzer houses
ISO/IEC8802-3:2000， nformation technologyTelecommunications and informationexchange between systems – Local and metropolitan area networks – Specific requirements -Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method andphysical layer specifications
BS 5925:1991, Code of practice for ventilation principles and designing for natural ventilation
API (ANSI/ASTM D4177), Manual of Petroleum Measurement Standards – Part 8: Chapter 8.2Automatic Sampling of Petroleum Products ()
EEMUA 175. Code of Practice for Calibration and Checking Process Analysers (Formerly lP340)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply
3.1
analyser housing
general term including any of the following terms
3.2
analyser case
enclosure forming part of the instrument
3.3
analyser cabinet
small simple housing in which analysers are installed singly or grouped together. Maintenanceis carried out from outside the cabinet
3.4
analyser shelter
structure with one or more sides open and free from obstruction to the natural passage of airin which are installed one or more analysers. The maintenance of the analyser is normallycarried out from within the shelter
3.5
analyser house
enclosed structure in which are installed one or more analysers. Either natural or forced ventilation is used. The maintenance of the analyser is always carried out from within the
house
4 Remarks and considerations
4.1 General remarks
The petrochemical, chemical, pharmaceutical and food industries need to be able to control their processes to ensure safety and environmental compliance and to optimise operations for maximum profitability. The use of on-line process analysers is a valuable tool in helping to achieve these objectives. This is because analysers provide frequent (continuous or cyclic) analytical information on key process properties to allow continuous on-line optimisation of the plant and rapid identification and correction of off-spec or undesirable operating conditions. Analyser repeatability is also usually better than a laboratory reference method which allows closer control and targeting to product specification.