IEC 61207-3-2019 pdf download.Gas analyzers – Expression of performance – Part 3: Paramagnetic oxygen analyzers.
This part of IEC 61 207 applies to the three main methods for measuring oxygen by its paramagnetic property, which are outlined in the introduction. It considers essential ancillary units and applies to analyzers installed indoors and outdoors. Safety-critical applications can require additional requirements from system and analyzer specifications not covered in this document.
This document is intended
– to specify terminology and definitions related to the functional performance of para- magnetic gas analyzers for the measurement of oxygen in a source gas;
– to unify methods used in making and verifying statements on the functional performance of such analyzers;
– to specify what tests are performed to determine the functional performance and how such tests are carried out;
– to provide basic documents to support the application of internationally recognized quality management standards.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 61 207-1 , Expression of performance of gas analyzers – Part 1: General
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE Although cgs (centimetre-gram-second) units have been used in this document, SI (Système International) units (such as defined in IUPAC [1 ] 1 ) can also be used.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Procedures for specification
4.1 General
The procedures are detailed in IEC 61 207-1 . This covers:
– operation and storage requirements;
– specification of ranges of measurement and output signals;
– limits of uncertainties;
– recommended reference values and rated ranges of influence quantities (see IEC 60654-1 ).
In this part of IEC 61 207, requirements for essential ancillary units and services are given.
Additional characteristics for specification of performance and important aspects of performance relevant to paramagnetic analyzers are detailed.
4.2 Specification of essential ancillary units and services 4.2.1 Sampling system The sampling system shall be specified to supply the sample within the rated range of influence quantities of the analyzer. Simple elements of the sampling system may be included in the analyzer. Sample flow meters, sample flow regulation, bypass flow meters, bypass flow regulations, sample filters are often part of the analyzer. If certain system elements are included in the analyzer the rated range of influence quantities will be less severe compared to an analyzer without any sampling system. The sampling system will add a delay in addition to the response time of the analyzer. Hence, the sample system response time should be specified. The chemical composition of the sample stream shall be considered in the system specification. Special precautions need to be taken for flammable samples, toxic samples or corrosive samples. Some materials are permeable to oxygen (for example, silicones) and the measurement uncertainties that may be introduced by them should be considered and avoided if necessary. For systems measuring very high concentrations of oxygen, the sampling system components should be clean for oxygen service to prevent any dangerous reactions with flammable contaminants.IEC 61207-3 pdf download.