IEC 62828-2:2017 pdf download

IEC 62828-2:2017 pdf download.Reference conditions and procedures for testing industrial and process measurement transmitters
1 Scope
This part of IEC 62828 establishes specific procedures for testing pressure process measurement transmitters (PMT) used in measuring and control systems for industrial processes and for machinery control systems. A pressure PMT can feature a remote seal to bring the process variable to the sensing element in the PMT. When the remote seal cannot be separated from the PMT, the complete device is tested. For general test procedures, reference is made to IEC 62828-1 , which is applicable to all types of process measurement transmitters. NOTE In industrial and process applications, to indicate the process measurement transmitters, it is common also to use the terms “industrial transmitters”, or “process transmitters”.
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 62828-1 , Reference conditions and procedures for testing industrial and process measurement transmitters – Part 1: General procedures for all types of transmitters
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62828-1 and the following apply. 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 3.1 General 3.1 .1 absolute pressure p abs pressure using absolute vacuum as the datum point Note 1 to entry: The CDD code of this entry for Electronic Data Exchange is ABB1 81 . 3.1 .2 ambient atmospheric pressure p amb pressure exerted by the atmospheric air at a given altitude and temperature Note 1 to entry: The atmospheric pressure decreases with the altitude by about 1 0 Pa/m (Pascal per metre).Note 1 to entry: Gauge pressure assumes positive values when the absolute pressure is greater than the ambient atmospheric pressure; it assumes negative values when the absolute pressure is less than the ambient atmospheric pressure. Note 2 to entry: In certain industrial environments, “gauge pressure” may be referred to as “pressure”. Note 3 to entry: The term “relative pressure” to indicate gauge pressure is obsolete and conceptually wrong, so it should be avoided. Note 4 to entry:Tthe CDD code of this entry for Electronic Data Exchange is ABB1 82. 3.1 .5 line pressure static pressure pressure applied on both sides of a differential pressure PMT Note 1 to entry: For differential pressure PMTs, it is an influence factor that is bilateral and does not represent the measurand. 3.1 .6 leakage rate leakage, permeation and/or diffusion effects of the medium through the PMT and/or its mounting devices over the testing period under static pressure conditions, expressed as normal volume flow rate Note 1 to entry: The CDD code of this entry for Electronic Data Exchange is ABD632. 3.1 .7 measuring range <for pressure PMTs> range related to the measurement of absolute and gauge pressure PMTs Note 1 to entry: For a pressure PMT with variable (adjustable or programmable) span, the measuring range and associated terms are shown in Figure 2. Note 2 to entry: See also Annex C for an example of signal current range of a 4 mA to 20 mA PMT.
3.1 .8 overpressure limit proof pressure multiple of indicated range with which the device may be subjected to pressure without permanent damage Note 1 to entry: The output signal at the overpressure limit is sometimes unreliable and/or not predictable. The specification applies to the maximum permitted medium temperature. Note 2 to entry: After returning to the measuring range, the guaranteed metrological properties shall remain unchanged. Note 3 to entry: The CDD code of this entry for Electronic Data Exchange is ABC027. 3.1 .9 pressure force per unit area applied in a direction perpendicular to a surface Note 1 to entry: The SI unit for pressure is the Pascal (Pa), equal to one Newton per square metre (N/m 2 or kg·m −1 ·s −2 ). Note 2 to entry: In Annex A, a table shows the relationship between the SI unit and other units, often used for process measurement transmitter applications. Note 3 to entry: For the purpose of this document, a simplified definition could be accepted as follows: “Ratio of orthogonal component of the force per unit area to that unit area”.