ISO 14511 pdf download

ISO 14511 pdf download.Measurement of fluid flow in closed conduits — Thermal mass flowmeters 1 Scope This International Standard gives guidelines for the specification, testing, inspection, installation, operation and calibration of thermal mass gas flowmeters for the metering of gases and gas mixtures. It is not applicable to measuring liquid mass flowrates using thermal mass flowmeters. This International Standard is not applicable to hot wire and other hot film anemometers, also used in making point velocity measurements. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 4006, Measurementoffluidflowin closedconduits — Vocabularyandsymbols ISO 7066-2, Assessment of uncertainty in the calibration and use of flow measurement devices — Part2: Non- linearcalibration relationships Guide to the expression ofuncertaintyin measurement (GUM). BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML, 1 st edition, corrected and reprinted in 1 995 IEC 61 000-4, Electromagnetic compatibility(EMC) — Part4: Testing andmeasurement techniques 3 Terms and definitions For the purposes of this International Standard, the terms and definitions given in ISO 4006 and the following apply. NOTE The term “gas” is used as a synonym for single gases, gas mixtures and vapours. 3.1 General terms 3.1.1 flowrate quotient of the quantity of fluid passing through the cross-section of a conduit and the time taken for this quantity to pass through this section NOTE In this International Standard.3.1.2 mass flowrate flowrate in which the quantity of fluid is expressed as a mass NOTE The term “flowrate” is used as a synonym for mass flowrate in this International Standard, unless otherwise stated. 3.1.3 accuracy of measurement closeness of the agreement between the result of a measurement and a true value of the measurand NOTE Accuracy is a qualitative concept. 3.1.4 uncertainty of measurement parameter, associated with the result of a measurement, that characterizes the dispersion of the values that can reasonably be attributed to the measurand 3.1.5 repeatability  measuring instrument ? ability of a measuring instrument to provide closely similar indications...