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Database: 365,228(8 Aug 2026)

Lao Flow Calibration

Lao Flow Calibration, Total:225 items.

The international standard classification for "Lao Flow Calibration" includes: Extraction and processing of petroleum and natural gas , Flow in closed conduits , Measurement of fluid flow in general , Welding equipment , Aerospace electric equipment and systems .

The Chinese standard classification for "Lao Flow Calibration" includes: Electromagnetic Measurement , Petroleum extraction , Flow capacity and material level instrument , Welding and cutting equipment , Sensor elements .


National Metrological Technical Specifications of the People's Republic of China

  • JJF 1462-2014 Calibration specification for DC (direct current) electronic load
  • JJF(机械)1028-2019 Calibration specification for power frequency transient current measurement system
  • JJF 1047-1994 Calibration Specification for Magnetic Coupling Measuring Transducer of DC Current
  • JJF 1830-2020 Calibration Specification of DC Magnetic Properties Measuring Instruments for Magnetically Soft Materials
  • JJF 1708-2018 On Line Calibration Specification for Coriolis Mass Flowmeters by Master Meter Method
  • JJF(机械) 1061-2021 Calibration specification for power frequency high current measurement system
  • JJF(石化)052-2021 Calibration Specification for Anti-Sag Meters
  • JJF(机械)1046-2020 Calibration specification for motor vehicle fuel flow meter
  • JJF(机械)1037-2019 Calibration Specifications for High Current Generators
  • JJF 1075-2015 Clamp Ammeter Calibration Specifications
  • JJF 1597-2016 Calibration Specification for DC Stabilized Power Supplies
  • JJF(机械) 1046-2020 Calibration specification for motor vehicle fuel flow meter
  • JJF 1357-2012 Calibration Specification for Wet Gas Meters
  • JJF 1502-2015 Calibration Specification for Reference Ballasts
  • JJF 1491-2014 Calibration Specification for Digital AC Electrical Parameters Meter
  • JJF(机械) 001-2008 External Shunt Calibration Specifications
  • JJF 1240-2010 Calibration Specification for Gas Flow Calibration Facility by Means of Critical Flow Venturi Nozzles
  • JJF 1999-2022 Calibration Specification for Rotating Element Current Meters
  • JJF(机械) 1028-2019 Calibration specification for power frequency transient current measurement system
  • JJF(机械) 1063-2021 Calibration specifications for AC, DC, lightning impulse, and universal voltage divider measurement systems
  • JJF(京) 53-2018 Calibration specification for gas flowmeter volume corrector
  • JJF(机械)1061-2021 Calibration specifications for power frequency high current measurement systems
  • JJF(京)53-2018 Calibration specification for gas flowmeter volume corrector
  • JJF 1586-2016 Calibration Specification for Active Piston Provers
  • JJF 1358-2012 Calibration Specification for DN1000-DN15000 Liquid Ultrasonic Flowmeters Calibration by Non Practical Flow Method
  • JJF 1665-2017 Calibration Specification for Flow Cytometers
  • JJF 1692-2018 Calibration Specification for Eddy Current Conductivity Meters
  • JJF(机械) 1040-2020 Calibration specification for DC high voltage measurement system
  • JJF(机械)1040-2020 Calibration specification for DC high voltage measurement system
  • JJF(机械) 022-2008 Calibration specification for zinc oxide surge arrester leakage current measuring instrument
  • JJF 1627-2017 Calibration Specification for Reference Leaks by Soap Film Fiowmeter
  • JJF 2033-2023 Calibration Specification for Orifice Flowmeters
  • JJF(机械)1063-2021 Calibration Specifications for AC, DC, Lightning Impulse, and Universal Voltage Divider Measurement Systems
  • JJF 1633-2017 Calibration Specification for Hemoperfusion Equipment
  • JJF(机械) 1036-2019 Calibration Specifications for DC High Voltage Generators
  • JJF 2134-2024 Calibration Specification for Rotational Rheometers
  • JJF(汽车) 06-2008 Calibration Specifications for Fuel Flow Meters
  • JJF 1284-2011 Calibration Specification of Calibrators for Electrical Meters
  • JJF(机械) 1037-2019 Calibration Specifications for High Current Generators
  • JJF 1075-2001 Calibration Specification of Clamp Ammeters
  • JJF 1636-2017 Calibration Specification for A. C. Resistance Boxes
  • JJF(机械) 002-2008 DC Standard Current Source Calibration Specifications

Professional Standard - Petroleum

  • SY/T 6675-2007 The calibration methodology of the down hole flow meter gauge
  • SY 6675-2007 Downhole Flow Meter Calibration Method
  • SY 6977-2014 Calibration method of real-time measuring and adjusting instrument for stratified flow in water injection well
  • SY/T 6977-2014 The calibration method of real-time measuring and adjusting instrument of flooding wells layered flux

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

  • GB/T 13282-1991 Flow measurement calibration facility--Pipe prover
  • GB/T 29820.1-2013 Assessment of uncertainty in calibration and use of flow measurement devices—Part 1:Linear calibration relationships
  • GB/T 32514.4-2016 Resistance welding―Welding current measurement for resistance welding―Part 4:Calibration system

Professional Standard - Electricity

  • DL/T 2268-2021 Calibration specification of measurement instrument forDC electric field strength

Group Standards of the People's Republic of China

Professional Standard - Water Conservancy

  • SL/T 232-1999 Verification method of dynamic liquid discharge and flow velocity facilities

Guangdong Provincial Standard of the People's Republic of China

国家能源局

  • SY/T 7384-2017 Calibration method of multiphase flow meters for oil,gas and water

Military Standard of the People's Republic of China-General Armament Department

Professional Standard - Aerospace

  • QJ 1027-1986 Technical Requirements and Calibration of Turbine Flow Transducer
  • QJ 1506-1988 Specification for flow measuring and calibrating devices by dynamic weighing
  • QJ 2160-1991 Specification for dynamic volumetric liquid flow measurement and calibration devices

Hubei Provincial Standard of the People's Republic of China

  • DB42/T 628-2010 Calibration specfication of multifunction calibrator for electric measuring instruments,transducters and AC sampling equipment

Professional Standard - Urban Construction

  • CJ/T 364-2011 Online calibration requirement for piping electromagnetic flowmeter

Professional Standard - Aviation

  • HB 6136.13-1987 Flight Test Instrument (Static) Calibration Specification Flow

未注明发布机构

Anhui Provincial Standard of the People's Republic of China

  • DB34/T 3187-2018 Calibration method of flow meter orifice plate in gas drainage system in coal mine

VDI - Verein Deutscher Ingenieure

SCC

  • VDI/VDE/DGQ/DKD 2622 BLATT 6:2019 Calibration of measuring instruments for electrical quantities — Calibration of DC power supplies
  • BS 7118-1:1990 Measurement of fluid flow: assessment of uncertainty in the calibration and use of flow measurement devices-Linear calibration relationships
  • VDI/VDE/DGQ/DKD 2622 BLATT 8:2018 Calibration of measuring instruments for electrical quantities — DC resistances
  • JIS Z 2502:2020 Metallic powders -- Determination of flow rate by means of a calibrated funnel (Hall flowmeter)
  • BS ISO/TR 7066-1:1997 Assessment of uncertainty in calibration and use of flow measurement devices-Linear calibration relationships
  • AS 2360.7.1:1993 Measurement of fluid flow in closed conduits, Part 7.1: Assessment of uncertainty in the calibration and use of flow measurement devices - Linear calibration relationship
  • DANSK DS/EN ISO 4490:2014 Metallic powders – Determination of flow rate by means of a calibrated funnel (Hall flowmeter)
  • BS ISO 11605:1995 Paper and board. Calibration of variable-area flowmeters
  • VDI/VDE/DGQ/DKD 2622 BLATT 20:2013 Calibration of measuring instruments for electrical quantities — DC voltage measuring amplifiers
  • NS-EN ISO 4490:2008 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter) (ISO 4490:2008)
  • NS-EN ISO 4490:2018 Metallic powders — Determination of flow rate by means of a calibrated funnel (Hall flowmeter) (ISO 4490:2018)
  • DANSK DS/ISO 13517:2020 Metallic powders – Determination of flow rate by means of a calibrated funnel (Gustavsson flowmeter)
  • UNE-EN ISO 4490:2010 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter) (ISO 4490:2008)
  • NS-EN ISO 4490:2014 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter) (ISO 4490:2014)
  • DANSK DS/EN ISO 13517:2020 Metallic powders – Determination of flow rate by means of a calibrated funnel (Gustavsson flowmeter) (ISO 13517:2020)
  • NS-EN ISO 13517:2013 Metallic powders — Determination of flowrate by means of a calibrated funnel (Gustavsson flowmeter) (ISO 13517:2013)
  • NS-EN ISO 13517:2020 Metallic powders — Determination of flow rate by means of a calibrated funnel (Gustavsson flowmeter) (ISO 13517:2020)
  • DIN EN ISO 4490 E:2017 Draft Document - Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter) (ISO/DIS 4490:2017); German and English version prEN ISO 4490:2017
  • 05/30077150 DC ISO 3455. Hydrometry. Calibration of current meters in straight open tanks
  • BS ISO 17657-4:2005 Resistance welding. Welding current measurement for resistance welding. Calibration system
  • 12/30218284 DC BS EN ISO 13517. Metallic powders. Determination of flowrate by means of a calibrated funnel (Gustavsson flowmeter)
  • BS 7825-3.7:1998 Calibration of rubber and plastics test equipment. Calibration schedules-Rheological properties
  • DIN EN ISO 13517 E:2019 Draft Document - Metallic powders - Determination of flowrate by means of a calibrated funnel (Gustavsson flowmeter) (ISO/DIS 13517:2019); German and English version prEN ISO 13517:2019
  • NS-EN ISO 4490:2001 Metallic powders — Determination of flow time by means of a calibrated funnel (Hall flowmeter) (ISO 4490:2001)
  • VDI/VDE/DGQ/DKD 2622 BLATT 15.4:2010 Calibration of measuring instruments for electrical quantities — Passive measuring instruments for EMC applications — Current transformer clamps
  • VDI/VDE/DGQ/DKD 2622 BLATT 24.1:2019 Calibration of measuring instruments for electrical quantities — power measuring devices in the direct current and low frequency range
  • 08/30179622 DC BS EN ISO 4490. Metallic powders. Determination of flow time by means of a calibrated funnel (Hall flowmeter)
  • UNE-EN ISO 4490:2002 Metallic powders - Determination of flow time by means of a calibrated funnel (Hall flowmeter). (ISO 4490:2001)

British Standards Institution (BSI)

  • BS 7118-2:1989 Measurement of fluid flow: assessment of uncertainty in the calibration and use of flow measurement devices. Non-linear calibration relationships
  • BS EN ISO 4490:2018 Metallic powders. Determination of flow rate by means of a calibrated funnel (Hall flowmeter)
  • BS EN ISO 13517:2020 Metallic powders. Determination of flow rate by means of a calibrated funnel (Gustavsson flowmeter)
  • BS EN ISO 4490:2002 Metallic powders - Determination of flow time by means of a calibrated funnel (Hall flowmeter)
  • BS EN ISO 13517:2013 Metallic powders. Determination of flowrate by means of a calibratedfunnel (Gustavsson flowmeter)
  • 20/30354937 DC BS ISO 3455. Hydrometry. Calibration of current-meters in straight open tanks
  • BS EN ISO 17657-4:2007 Resistance welding. Welding current measurement for resistance welding - Calibration system
  • 19/30389990 DC BS EN ISO 13517. Metallic powders. Determination of flowrate by means of a calibrated funnel (Gustavsson flowmeter)
  • BS ISO 14934-2:2013 Fire tests. Calibration and use of heat flux meters. Primary calibration methods
  • BS EN ISO 4490:2008 Metallic powders - Determination of flow time by means of a calibrated funnel (Hall flowmeter)
  • BS EN ISO 4490:2014 Metallic powders. Determination of flow rate by means of a calibrated funnel (Hall flowmeter)
  • BS 7550-2:1993 Calibration of spherical tanks for refrigerated light-hydrocarbon fluids in ships. Triangulation method
  • BS ISO TR 7066-1:1997 Assessment of uncertainty in calibration and use of flow measurement devices - Linear calibration relationships

American Society for Testing and Materials (ASTM)

Danish Standards Foundation

  • DS/EN ISO 13517:2013 Metallic powders - Determination of flowrate by means of a calibrated funnel (Gustavsson flowmeter)
  • DS/EN ISO 4490:2008 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter)

GSO

  • OS GSO ISO 4490:2016 Metallic powders -- Determination of flow rate by means of a calibrated funnel (Hall flowmeter)
  • GSO ISO 4490:2016 Metallic powders -- Determination of flow rate by means of a calibrated funnel (Hall flowmeter)
  • GSO ISO 13517:2015 Metallic powders -- Determination of flowrate by means of a calibrated funnel (Gustavsson flowmeter)
  • BH GSO ISO 13517:2017 Metallic powders -- Determination of flowrate by means of a calibrated funnel (Gustavsson flowmeter)
  • GSO ISO 7066-2:2008 Assessment of uncertainty in calibration and use of flow measurement devices - Part 2: Non-linear calibration relationships
  • GSO ISO/TR 7066-1:2007 Assessment of uncertainty in calibration and use of flow measurement devices - Part I: Linear calibration relationships
  • OS GSO ISO 3455:2009 Hydrometry - Calibration of current-meters in straight open tanks
  • GSO ISO 3455:2024 Hydrometry — Calibration of current-meters in straight open tanks

Association Francaise de Normalisation

  • NF A95-114*NF EN ISO 13517:2020 Metallic powders - Determination of flow rate by means of a calibrated funnel (Gustavsson flowmeter)
  • NF A95-113*NF EN ISO 4490:2018 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter)
  • NF X10-108*NF ISO 7066-2:1988 Assessment of uncertainty in the calibration and use of flow measurement devices. Part 2 : non-linear calibration relationships.
  • NF A95-113:2014 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter)
  • NF A95-113:2008 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter).
  • NF ISO 7066-2:1988 Assessment of uncertainty in the calibration and use of flow measuring devices - Part 2: nonlinear calibration relationships
  • NF EN ISO 17657-4:2007 Soudage par résistance - Mesurage des courants en soudage par résistance - Partie 4 : système d'étalonnage
  • NF C46-503:1993 INDUSTRIAL-PROCESS CONTROL VALVES. PART 2 : FLOW CAPACITY. SECTION ONE : SIZING EQUATIONS FOR INCOMPRESSIBLE FLUID FLOW UNDER INSTALLED CONDITIONS. (EUROPEAN STANDARD EN 60 534-2-1).

Korean Agency for Technology and Standards (KATS)

  • KS D ISO 4490-2013 Metallic powders-Determination of flow rate by means of a calibrated funnel(Hall flowmeter)
  • KS M ISO 11605:2008 Paper and board-Calibration of variable-area flowmeters
  • KS M ISO 11605:2003 Paper and board-Calibration of variable-area flowmeters
  • KS B ISO TR 7066-1-2015 Assessment of uncertainty in calibration and use of flow measurement devices-Part 1:Linear calibration relationships
  • KS B ISO TR 7066-1-2004(2014) Assessment of uncertainty in calibration and use of flow measurement devices-Part 1:Linear calibration relationships
  • KS D ISO 4490:2013 Metallic powders-Determination of flow rate by means of a calibrated funnel(Hall flowmeter)
  • KS D ISO 4490:2010 Metallic powders-Determination of flow rate by means of a calibrated funnel(Hall flowmeter)
  • KS B ISO 3455:2020 Hydrometry — Calibration of current-meters in straight open tanks
  • KS B ISO 3455:2015 Liquid flow measurement in open channels — Calibration of rotating-element current-meters in straight open tanks
  • KS D 0035-2006 Metallic powders-Determination of flow time by means of a calibrated funnel(hall flowmeter)
  • KS D 0035-1985 Metallic powders-Determination of flow time by means of a calibrated funnel(hall flowmeter)
  • KS B ISO 3455:2014 Liquid flow measurement in open channels-Calibration of rotating-element current-meters in straight open tanks
  • KS B ISO 7066-2:2020 Assessment of uncertainty in the calibration and use of flow measurement devices — Part 2: Non-linear calibration relationships
  • KS B ISO 3455:2004 Liquid flow measurement in open channels-Calibration of rotating-element current-meters in straight open tanks
  • KS D 0035-2011 Metallic powders-Determination of flow time by means of a calibrated funnel(hall flowmeter)
  • KS C IEC 60534-2-1:2004 Industrial-process control valves-Part 2-1:Flow capacity-Sizing equations for fluid flow under installed conditions
  • KS B ISO 7066-2:2014 Assessment of uncertainty in the calibration and use of flow measurement devices — Part 2: Non-linear calibration relationships
  • KS B ISO 7066-2:2004 Assessment of uncertainty in the calibration and use of flow measurement devices-Part2:Non-linear calibration relationships

KR-KS

  • KS D ISO 4490-2010 Metallic powders-Determination of flow rate by means of a calibrated funnel(Hall flowmeter)
  • KS M ISO 11605-2003 Paper and board-Calibration of variable-area flowmeters
  • KS B ISO 3455-2020 Hydrometry — Calibration of current-meters in straight open tanks
  • KS B ISO 7066-2-2020 Assessment of uncertainty in the calibration and use of flow measurement devices — Part 2: Non-linear calibration relationships

Standard Association of Australia (SAA)

  • AS 2360.7.2:1993 Measurement of fluid flow in closed conduits - Assessment of uncertainty in the calibration and use of flow measurement devices - Non-linear calibration relationships
  • AS 2360.7.1:2001 Measurement of fluid flow in closed conduits - Assessment of uncertainty in the calibration and use of flow measurement devices - Linear calibration relationships
  • AS 4250.2:1995 Liquid hydrocarbons - Dynamic measurement - Proving systems for volumetric meters - Pipe provers
  • AS 3778.6.3:1992 Measurement of water flow in open channels - Measuring devices, instruments and equipment - Calibration of rotating element current-meters in straight open tanks
  • AS 4250.4:1995 Liquid hydrocarbons - Dynamic measurement - Proving systems for volumetric meters - Temperature corrections in volumetric calibration by water transfer method

Association of German Mechanical Engineers

German Institute for Standardization

  • DIN EN ISO 4490:2018-08 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter) (ISO 4490:2018); German version EN ISO 4490:2018
  • DIN EN ISO 13517:2020 Metallic powders - Determination of flow rate by means of a calibrated funnel (Gustavsson flowmeter) (ISO 13517:2020)
  • DIN EN ISO 13517:2020-08 Metallic powders - Determination of flow rate by means of a calibrated funnel (Gustavsson flowmeter) (ISO 13517:2020); German version EN ISO 13517:2020
  • DIN EN ISO 4490:2018 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter) (ISO 4490:2018)
  • DIN EN ISO 4490:2009 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter) (ISO 4490:2008); English version of DIN EN ISO 4490:2009-02

ES-UNE

  • UNE-EN ISO 4490:2018 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter) (ISO 4490:2018)
  • UNE-EN ISO 13517:2021 Metallic powders - Determination of flow rate by means of a calibrated funnel (Gustavsson flowmeter) (ISO 13517:2020)

ISA - International Society of Automation

  • ISA RP16.6-1961 Methods and Equipment for Calibration of Variable Area Meters (Rotameters)
  • ISA RP31.1-1977 Specification@ Installation@ and Calibration of Turbine Flowmeters

Japanese Industrial Standards Committee (JISC)

AENOR

  • UNE-EN ISO 13517:2014 Metallic powders - Determination of flowrate by means of a calibrated funnel (Gustavsson flowmeter) (ISO 13517:2013)
  • UNE-EN ISO 4490:2015 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter) (ISO 4490:2014)
  • UNE 82206-1:1996 ASSESSMENT OF UNCERTAINTY IN THE CALIBRATION AND USE OF FLOW MEASUREMENT DEVICES. PART 1: LINEAR CALIBRATION RELATIONSHIPS.

PL-PKN

  • PN-EN ISO 13517-2020-11 E Metallic powders -- Determination of flow rate by means of a calibrated funnel (Gustavsson flowmeter) (ISO 13517:2020)

Lithuanian Standards Office

  • LST EN ISO 4490:2008 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter) (ISO 4490:2008)
  • LST ISO 7066-2:2002 Assessment of uncertainty in calibration and use of flow measurement devices. Part 2: Non-linear calibration relationships (idt ISO 7066-2:1988)

CZ-CSN

  • CSN ISO 3455:1994 Liquid flow measurement in open channels. Calibration of rotating-element current meters in straight open tanks
  • CSN ISO 7066-2:1994 Assessment of uncertainty in the calibration and use of flow measurement devices Part 2: Non-linear calibration relationships

International Organization for Standardization (ISO)

  • ISO 4490:2018 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter)
  • ISO 4490:2001 Metallic powders - Determination of flow time by means of a calibrated funnel (Hall flowmeter)
  • ISO 4490:1978 Metallic powders; Determination of flowability by means of a calibrated funnel (Hall flowmeter)
  • ISO 4490:2008 Metallic powders — Determination of flow rate by means of a calibrated funnel (Hall flowmeter) (Fourth Edition)
  • ISO 4490:2014 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter)
  • ISO 13517:2020 Metallic powders — Determination of flow rate by means of a calibrated funnel (Gustavsson flowmeter)
  • ISO 7066-1:1989 Assessment of uncertainty in the calibration and use of flow measurement devices; part 1: linear calibration relationships
  • ISO 7066-2:1988 Assessment of uncertainty in the calibration and use of flow measurements devices; part 2: non-linear calibration relationships
  • ISO/TS 14934-4:2007 Fire tests - Calibration of heat flux meters - Part 4: Guidance on the use of heat flux meters in fire tests

European Committee for Standardization (CEN)

  • EN ISO 4490:2014 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter) (ISO 4490:2014)
  • EN ISO 4490:2008 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter)
  • EN ISO 4490:2018 Metallic powders - Determination of flow rate by means of a calibrated funnel (Hall flowmeter)

CEN - European Committee for Standardization

  • EN ISO 4490:2001 Metallic Powders - Determination of Flow Time by Means of a Calibrated Funnel (Hall Flowmeter)

U.S. Air Force

BE-NBN

  • NBN-ISO 7066-1:1990 Schatting van de onnauwkeurigheden bij net ijken en het gebruik van debietmeetinstrumenten - Deel 1 : Lineaire ijkingsverhoudingen
  • NBN E 17-005-1988 Estimation of inaccuracies in the use and calibration of flow measuring instruments

API - American Petroleum Institute

  • API MPMS 4.9.3-2010 Manual of Petroleum Measurement Standards Chapter 4—Proving Systems Section 9—Methods of Calibration for Displacement and Volumetric Tank Provers Part 3—Determination of the Volume of Displacement Provers by the Master Meter Method of Calibration Measurem
  • API MPMS 4.9.4-2010 Manual of Petroleum Measurement Standards Chapter 4—Proving Systems Section 9—Methods of Calibration for Displacement and Volumetric Tank Provers Part 4—Determination of the Volume of Displacement and Tank Provers by the Gravimetric Method of Calibration

National Aeronautics and Space Administration (NASA)

RU-GOST R

  • GOST R 8.908-2015 State system for ensuring the uniformity of measurements. Measuring instruments of volume flow of oil and oil products. Tests, verification and calibration with provers

YU-JUS

  • JUS U.C5.085-1994 Liquid flow measurement in open channels - Calibration of rotating-element current-meters in straight open tanks