1.1 This standard is applicable to electrochemical analyzers used for the determination of
certain properties of (generally aqueous) solutions such as pH value, electrical
conductivity, dissolved oxygen content, the concentration of specified ions and redox potential.
1.2 It includes the terminology, definitions, requirements for statements by manufacturers and tests that are common to all electrochemical analyzers. Other standards in this series describe those aspects that are specific to certain types, for example, IEC Publication 746-2: Expression of Performance of Electrochemical Analyzers, Part 2: pH value.
1.3 This standard is in accordance with the general principles set out in IEC Publication
359: Expression of the Functional Performance of Electronic Measuring Equipment.
1.4 It is applicable to analyzers specified for installation in any location and to such analyzers having either flow-through or immersible type sensors.
1.5 It is applicable to the complete analyzer when supplied by one manufacturer as an integral unit comprised of all mechanical, electrical and electronic portions. It also applies to sensor units alone and electronic units alone when supplied separately or by different manufacturers.
For the purposes of this standard, any regulator for mains-supplied power or any non-mains power supply, provided with the analyzer or specified by the manufacturer, is considered part of the analyzer whether it is integral with the analyzer or housed separately.
1.6 It does not apply to accessories such as recorders, analogue-to-digital converters or data
acquisition systems, used in conjunction with the analyzers except that when two or more such analyzers are combined and sold as a sub-system and a single electronic unit is supplied to provide continuous measurement of several properties, that readout unit is considered to be part of the analyzer. Similarly, e.m.f.-to-current or e.m.f.-to-pressure converters that are an integral part of the analyzer are included.
1.7 Safety requirements are dealt with in IEC Publication 348: Safety Requirements for
Electronic Measuring Apparatus.
1.8 Standard ranges of analogue d.c. current and pneumatic signals used in process control systems are dealt with in IEC Publication 381-1: Analogue Signals for Process Control Systems, Part 1: Direct Current Signals, and IEC Publication 382: Analogue Pneumatic Signal for Process Control Systems.
1.9 Requirements for documentation to be supplied with instruments are dealt with in IEC
Publication 278: Documentation to be Supplied with Electronic Measuring Apparatus and 278A: First Supplement to Publication 278 (1968).
1.10 Requirements for general principles concerning quantities, units and symbols are dealt with in ISO Standard 1000. See also ISO Standard 31, Parts 0 to XIII.
SIS SS IEC 746:1984 history
1984SIS SS IEC 746:1984 Electronic measuring equipment - Expression of performance of electrochemical analyzers