NEN EN 306 : 1997

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
    3.1 Measurement of temperature
    3.2 Measurement of flow-rate
    3.3 Measurement of pressure
    3.4 Measurement of fluid quality
    3.5 General definitions
4 Sampling
    4.1 Sampling frequency
    4.2 Measuring sampling period
    4.3 Simultaneous reading of measurement
    4.4 Mean value calculation
5 Temperature measurement
    5.1 Purpose
    5.2 Equipment
          5.2.1 Expansion thermometers
          5.2.2 Resistance thermometers
          5.2.3 Thermocouples
    5.3 Preparations
          5.3.1 Installation
          5.3.2 Location
          5.3.3 Static measurement error
          5.3.4 Dynamic measurement error
          5.3.5 Other requirements for temperature
                  sensor installation
    5.4 Calibration
          5.4.1 Purpose
          5.4.2 Traceability
          5.4.3 Uncertainty of calibration
          5.4.4 Calibration interval
    5.5 Stability
    5.6 Presentation of temperature measurement
6 Measurement of flow-rate
    6.1 Purpose
    6.2 Equipment
          6.2.1 Common measuring methods for liquids
                  and gas
          6.2.2 Measurement methods for liquid flow-rates
          6.2.3 Measurement of two-phase flow
    6.3 Preparations
          6.3.1 Installation
          6.3.2 Location
          6.3.3 Static measurement error
          6.3.4 Dynamic measurement error
          6.3.5 Other requirements for flow meter
                  installation
    6.4 Calibration
          6.4.1 Purpose
          6.4.2 Traceability
          6.4.3 Uncertainty of calibration
          6.4.4 Calibration interval
    6.5 Stability
    6.6 Presentation of mass flow measurement
7 Measurement of pressure
    7.1 Purpose
    7.2 Measurement probes and pressure tappings
          7.2.1 Total pressure
          7.2.2 Static pressure
          7.2.3 Dynamic pressure
          7.2.4 Pressure drop
    7.3 Equipment
          7.3.1 U-tube manometer
          7.3.2 Pressure transducer
    7.4 Preparations
          7.4.1 Installation
          7.4.2 Location
          7.4.3 Static measuring error
          7.4.4 Dynamic measuring errors
          7.4.5 Other requirements for pressure tapping
                  installation
    7.5 Calibration
          7.5.1 Purpose
          7.5.2 Traceability
          7.5.3 Uncertainty of calibration
          7.5.4 Calibration interval
    7.6 Stability
    7.7 Presentation of pressure measurement
8 Fluid quality
    8.1 Purpose
    8.2 Determination of density
    8.3 Determination of specific heat capacity/
          enthalpy
    8.4 Determination of vapour ratio, (x)
    8.5 Determination of phase state
    8.6 Determination of viscosity
    8.7 Determination of mass ratios
9 Requirements for peripheral equipment and media
    9.1 Peripheral equipment
          9.1.1 Regulating system
          9.1.2 Heaters and coolers
          9.1.3 Flows
          9.1.4 Pressures
    9.2 Media
          9.2.1 Ageing
          9.2.2 Filtering
10 Test record
    10.1 Laboratory test and acceptance test

                  

Defines methods and accuracy of measurement for temperature, pressure, fluid quality and massflow of different fluids, together with a method of determination of the pressure drops across a heat exchanger.