IEC 60746-1:2003 pdf free download

IEC 60746-1:2003 pdf free download Expression of performance of electrochemical analyzers – Part 1: General
4 Comparison of IEC Standards for Specification and Evaluation
The methods for specification of analyzer performance characteristics used by manufacturers should be compatible with methods for specification of performance requirements by users. For accurate comparison of manufacturers’ specifications and users’ requirements, the para- meters used to define the performance characteristics of the equipment must be selected and defined identically.
An electrochemical sensor has particular characteristics primarily determined by chemical properties, and these can only be slightly modified by constructional techniques. Moreover, the sensor is directly exposed to a working fluid which can exert a range of influence factors on the sensor system. This is in contrast to the operation of the purely electrical measuring devices considered in many other related standards, where the signal is injected electrically into the instrument’s circuits and the sensing of that signal is entirely internal. The approach to the determination and statement of performance characteristics used in 6.4.2 of IEC 60359 entitled Limits of intrinsic instrumental uncertainty with variations for a single influence quantity was selected as the best basis for defining the performance of electrochemical type analyzers. Therefore, requirements for statements in this document are generally given in accordance with that document, with some performance parameters and test methods based on IEC 60770.
Alternative approaches adopted in other IEC documents are summarized below, for comparison:
IEC 61298, Subclause 3.9: Maximum measured uncertainty
A non-statistical test of instrument conformity, where the maximum and minimum uncertainties are reported from a series of tests. This is particularly appropriate to batch tests where a limited series of tests should yield individual results within the limits of uncertainty specified for the rated operating conditions.
IEC 60770, Evaluating the performance of transmitters for use in industrial-process control systems Procedures defined in this standard are closely aligned with those in IEC 60359. Both IEC 60359 and IEC 60770 are primarily directed to the evaluation of purely electrical (or pneumatic) systems. Procedures defined in the following clauses are from these two documents but take into account the chemical nature of the sensor. Definitions of terms have all been based on these documents.
5 Procedure for specification
5.1 Specification of values and ranges Manufacturers specifying the performance of complete analyzers, sensor units or electronic units, shall give statements covering all quantities considered to be applicable performance characteristics.
These statements shall cover the aspects which will be described in the following subclauses.