IMIN - Measurement instruments

This document specifies the geometry and method of use (installation and operating conditions) of
nozzles and Venturi nozzles when they are inserted in a conduit running full to determine the flowrate
of the fluid flowing in the conduit.
This document also provides background information for calculating the flowrate and is applicable in
conjunction with the requirements given in ISO 5167-1.
This document is applicable to nozzles and Venturi nozzles in which the flow remains subsonic
throughout the measuring section and where the fluid can be considered as single-phase. In addition,
each of the devices can only be used within specified limits of pipe size and Reynolds number. It is
not applicable to the measurement of pulsating flow. It does not cover the use of nozzles and Venturi
nozzles in pipe sizes less than 50 mm or more than 630 mm, or where the pipe Reynolds numbers are
below 10 000.
This document deals with
a) three types of standard nozzles:
1) ISA 19325) nozzle;
2) the long radius nozzle6);
3) the throat-tapped nozzle
b) the Venturi nozzle.
The three types of standard nozzle are fundamentally different and are described separately in this
document. The Venturi nozzle has the same upstream face as the ISA 1932 nozzle, but has a divergent
section and, therefore, a different location for the downstream pressure tappings, and is described
separately. This design has a lower pressure loss than a similar nozzle. For all of these nozzles and for
the Venturi nozzle direct calibration experiments have been made, sufficient in number, spread and
quality to enable coherent systems of application to be based on their results and coefficients to be
given with certain predictable limits of uncertainty.

ISO 20456:2017 applies to industrial electromagnetic flowmeters used for the measurement of flowrate of a conductive liquid in a closed conduit running full. It covers flowmeter types utilizing both alternating current (AC) and pulsed direct current (DC) circuits to drive the field coils and meters running from a mains power supply and those operating from batteries or other sources of power.
ISO 20456:2017 is not applicable to insertion-type flowmeters or electromagnetic flowmeters designed to work in open channels or pipes running partially full, nor does it apply to the measurement of magnetically permeable slurries or liquid metal applications.
ISO 20456:2017 does not specify safety requirements in relation to hazardous environmental usage of the flowmeter.

This standard considers liquid precipitation and defines a classification for catching-type RI measurement instruments based on their laboratory performance. Standardised calibration tests are described for the assessment of the accuracy of these raingauges both in the laboratory and in the field. The classification does not relate to the physical principle used for the measurement nor does it refer to the technical characteristics of the instrument assembly. The classification is solely based on the accuracy of the raingauge rainfall intensity calibration.

This document specifies the geometry and method of use (installation and operating conditions) of wedge meters when they are inserted in a conduit running full to determine the flow rate of the fluid flowing in the conduit.
NOTE 1 As the uncertainty of an uncalibrated wedge meter can be too large for a particular application, it could be deemed essential to calibrate the flow meter according to Clause 7.
This document gives requirements for calibration which, if applied, are for use over the calibrated Reynolds number range. Clause 7 could also be useful guidance for calibration of meters of similar design but which fall outside the scope of this document.
It also provides background information for calculating the flow rate and is applicable in conjunction with the requirements given in ISO 5167‑1.
This document is applicable only to wedge meters in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. Uncalibrated wedge meters can only be used within specified limits of pipe size, roughness, beta (or wedge ratio) and Reynolds number. It is not applicable to the measurement of pulsating flow. It does not cover the use of uncalibrated wedge meters in pipes whose internal diameter is less than 50 mm or more than 600 mm, or where the pipe Reynolds numbers are below 1 × 104.
NOTE 2 A wedge meter has a primary element which consists of a wedge-shaped restriction of a specific geometry. Alternative designs of wedge meters are available; however, at the time of writing there is insufficient data to fully characterize these devices, and therefore these meters are calibrated in accordance with Clause 7.

This document applies to industrial electromagnetic flowmeters used for the measurement of flowrate
of a conductive liquid in a closed conduit running full. It covers flowmeter types utilizing both
alternating current (AC) and pulsed direct current (DC) circuits to drive the field coils and meters
running from a mains power supply and those operating from batteries or other sources of power.
This document is not applicable to insertion-type flowmeters or electromagnetic flowmeters designed
to work in open channels or pipes running partially full, nor does it apply to the measurement of
magnetically permeable slurries or liquid metal applications.
This document does not specify safety requirements in relation to hazardous environmental usage of
the flowmeter.

This European Standard gives recommendations for the management of observed hydrometric data, including raw data
and other data and statistics derived from these observations.

This document defines the requirements for the use of rectangular and triangular (V-notch) thin-plate
weirs for the measurement of flow of clear water in open channels under free flow conditions. It includes
the requirements for the use of full-width rectangular thin-plate weirs in submerged (drowned) flow
conditions.

This document describes the establishment and operation of an ultrasonic (transit-time) gauging
station for the continuous measurement of discharge in a river, an open channel or a closed conduit.
It also describes the basic principles on which the method is based, the operation and performance of
associated instrumentation and procedures for commissioning.
It is limited to the “transit time of ultrasonic pulses” technique, and is not applicable to systems that
make use of the “Doppler shift” or “correlation” or “level-to-flow” techniques.
This document is not applicable to measurement in rivers with ice.
NOTE This document focuses on open channel flow measurement. IEC 60041 covers the use of the technique
for full pipe flow measurement.

This part of ISO 4064|OIML R 49 is applicable to the type evaluation and initial verification testing of
water meters for cold potable water and hot water as defined in ISO 4064-1:2014|OIML R 49‑1:2013.
OIML Certificates of Conformity can be issued for water meters under the scope of the OIML Certificate
System, provided that this part of ISO 4064|OIML R 49, ISO 4064-1:2014|OIML R 49‑1:2013 and
ISO 4064-3:2014|OIML R 49‑3:2013 are used in accordance with the rules of the System.
This part of ISO 4064|OIML R 49 sets out details of the test programme, principles, equipment and
procedures to be used for the type evaluation, and initial verification of a meter type.
The provisions of this part of ISO 4064|OIML R 49 also apply to ancillary devices, if required by national
regulations.
The provisions include requirements for testing the complete water meter and for testing the
measurement transducer (including the flow or volume sensor) and the calculator (including the
indicating device) of a water meter as separate units.

This part of ISO 4064 applies to water meters used to meter the volume of cold potable water and hot
water flowing through a fully charged, closed conduit. These water meters incorporate devices which
indicate the integrated volume.
This part of ISO 4064 specifies criteria for the selection of single, combination and concentric water
meters, associated fittings, installation, special requirements for meters, and the first operation of new
or repaired meters to ensure accurate constant measurement and reliable reading of the meter.
In addition to meters based on mechanical principles, this part of ISO 4064 also applies to water
meters based on electrical or electronic principles, and to water meters based on mechanical principles
incorporating electronic devices, used to measure the volume of cold potable water and hot water. It also
applies to electronic ancillary devices. Ancillary devices are optional. However, national or international
regulations may make some ancillary devices mandatory in relation to the utilization of the water meter.
The recommendations of this part of ISO 4064 apply to water meters, irrespective of technology, defined
as integrating measuring instruments continuously determining the volume of water flowing through
them.
NOTE Any national regulations apply in the country of use.

This part of ISO 4064|OIML R 49 specifies the metrological and technical requirements for water meters
for cold potable water and hot water flowing through a fully charged, closed conduit. These water meters
incorporate devices which indicate the integrated volume.
In addition to water meters based on mechanical principles, this part of ISO 4064|OIML R 49 applies to
devices based on electrical or electronic principles, and mechanical principles incorporating electronic
devices, used to measure the volume of cold potable water and hot water.
This part of ISO 4064|OIML R 49 also applies to electronic ancillary devices. Ancillary devices are
optional. However, it is possible for national or regional regulations to render some ancillary devices
mandatory in relation to the utilization of water meters.
NOTE Any national regulations apply in the country of use.

This part of ISO 5167 specifies the geometry and method of use (installation and operating conditions)
of cone meters when they are inserted in a conduit running full to determine the flow rate of the fluid
flowing in the conduit.
As the uncertainty of an uncalibrated cone meter might be too high for a particular application, it might
be deemed essential to calibrate the flow meter in accordance with Clause 7.
This part of ISO 5167 also provides background information for calculating the flow rate and is
applicable in conjunction with the requirements given in ISO 5167-1.
This part of ISO 5167 is applicable only to cone meters in which the flow remains subsonic throughout
the measuring section and where the fluid can be considered as single-phase. Uncalibrated cone meters
can only be used within specified limits of pipe size, roughness, β, and Reynolds number. This part of
ISO 5167 is not applicable to the measurement of pulsating flow. It does not cover the use of uncalibrated
cone meters in pipes sized less than 50 mm or more than 500 mm, or where the pipe Reynolds numbers
are below 8 × 104 or greater than 1,2 × 107.
A cone meter is a primary device which consists of a cone-shaped restriction held concentrically in the
centre of the pipe with the nose of the cone upstream. The design of cone meter defined in this part of
ISO 5167 has one or more upstream pressure tappings in the wall, and a downstream pressure tapping
positioned in the back face of the cone with the connection to a differential pressure transmitter being
a hole through the cone to the support bar, and then up through the support bar.
Alternative designs of cone meters are available; however, at the time of writing, there is insufficient
data to fully characterize these devices, and therefore, these meters shall be calibrated in accordance
with Clause 7.

The terminology used in this Standard conforms to the ?International Vocabulary of Basic and General Terms in Metrology? (VIM), the ?International Vocabulary of Terms in Legal Metrology? (VIML). In addition for the purposes of this Standard, the following definitions apply. An index of all the terms, 166 definitions and references defined below can be found under T.8.

This International Standard provides guidelines on the principles of operation and the selection and use of
Doppler-based and echo correlation velocity meters for continuous-flow gauging.
This International Standard is applicable to channel flow determination in open channels and partially filled
pipes using one or more meters located at fixed points in the cross-section.

This International Standard defines the requirements for equipment, anchorage, supports and
accessories for cableway systems for use in stream gauging. Systems which are operated either entirely
from the river bank or from a suspended personnel carriage (also called a “cable car”) are discussed.
This International Standard is only applicable to the cableway systems to be used for hydrometric
measurements. Should the cableway installation be required to be certified as lifting equipment, other
standards or regulations may apply. This International Standard does not concern methods for making
a discharge measurement which are described in ISO 748.

This European Standard specifies definitions, requirements and testing of additional functionalities for water
meters, without metrological impact, in combination with Additional Functionality Devices (AFD) and in
response to EU/EFTA Mandate M/441 EN. These AFDs are to be considered as “ancillary devices" as defined
in EN ISO 4064-1 and EN ISO 4064-4.
This European Standard does not cover the changing of metrological software within the meter or the
upload/download of metrological software.

EN ISO 4064-3 specifies a test report format to be used in conjunction with ISO 4064-1|OIML R 49-1 and ISO 4064-2|OIML R 49-2 for water meters for cold potable water and hot water.

EN ISO 4064-4 applies to water meters used to meter the volume of cold potable water and hot water flowing through a fully charged, closed conduit. These water meters incorporate devices which indicate the integrated volume. This part of ISO 4064 specifies technical characteristics and pressure loss requirements for meters for cold potable water and hot water. It applies to water meters which can withstand: a) a maximum admissible pressure (MAP) equal to at least 1 MPa1) [0,6 MPa for meters for use with pipe nominal diameters (DNs) ≥500 mm]; b) a maximum admissible temperature (MAT) for cold potable water meters of 30 °C; c) a MAT for hot water meters of up to 180 °C, depending on class. In addition to meters based on mechanical principles, this part of ISO 4064 also applies to water meters based on electrical or electronic principles, and to water meters based on mechanical principles incorporating electronic devices, used to meter the volume flow of hot water and cold potable water. It also applies to electronic ancillary devices. As a rule ancillary devices are optional. However, national or international regulations may make some ancillary devices mandatory in relation to the utilization of the water meter.

CEN/TR 16588 defines the requirements for manual measurements of SWE over land, see ice and glaciers, under natural environmental conditions, and shows methods for calculating the spatial distribution of the data. It includes measurements with snow tubes, core drills and density cutters.

EN-ISO 18365 gives requirements for the establishment and operation of a gauging station for the measurement of stage, or stage and discharge, of a lake, reservoir, river or canal or other artificial open channel. It also describes how a gauging station utilizing one of the measurement methods listed should be operated and maintained. Requirements are provided for stage only measurement stations, stage-discharge stations and directdischarge measurement stations in natural channels, as well as for stage-discharge stations with artificial structures. Additionally, some requirements are given for measurements under difficult conditions, such as under ice conditions.

This Technical Report describes a method for calibrating rainfall intensity (RI) gauges and the measurement requirements to obtain accurate and compatible data sets from hydro-meteorological networks, as a forerunner to the development of full hydro-meteorological data collection standards. This Technical Report deals exclusively with catching-type RI gauges (see Clause 3). It concentrates on the generic calibration, performance checking and estimation of uncertainties for RI gauges. It does not cover specific gauge measurement principles, technical characteristics and technology adopted in the design of RI gauges.

This International Standard specifies the procedure of calibration of current-meters of rotating-element type as well as stationary-sensor type (electromagnetic type) in straight open tanks. It also specifies the types of tank, rating carriage and equipment to be used and the method of presenting the results. The procedure does not take into account any possible difference existing between the behaviour of a currentmeter moving in motionless water and that of a fixed current-meter in turbulent flow.

This part of IS0 9555 deals with the use of chemical tracers in discharge measurements by the dilution method. Apparatus and methods of general application are set out in IS0 9555-l and are not repeated here, with the exception of those relating specifically to chemical tracers. Chemical tracers have several advantages\ as follows.
a) As with fluorescent tracers, the handling of the tracer follows normal chemical laboratory practice, and no special equipment (e.g. radiation
shielding) is required. Care is still required, however, when handling concentrated tracer, to avoid contamination of samples and, with some
tracers, for reasons of chemical toxicity.
b) In general, chemical tracers are widely available commercially, and tnay be stored indefinitely.
c) Analysis may be possible using laboratory facilities currently used for water quality determination.
d) In general, chemical tracers are phofochemically stable.

Concerns principles of the constant rate injection method and the sudden injection method (integration method), and the principles of injection, sampling and analysis which apply for all types of tracer. The tracers used and their concentrations should be compatible with the legislation of each country regarding the occasional and short-durations discharges of foreign substances into natural waters.

This International Standard provides a standard basis for the collection and processing of data for the determination of the uncertainties in measurements of discharge in open channels by velocity-area methods using current-meters. To determine the discharge in open channels by the velocity-area method, components of the flow (velocity, depth and breadth) need to be measured. The component measurements are combined to compute the total discharge. The total uncertainty in the computed discharge is a combination of the uncertainties in the measured components. Clause 4 of this International Standard deals with the types of errors and uncertainties involved. Clauses 5 and 6 present a standard procedure to estimate the component uncertainties by the collection and processing of the necessary data. This International Standard is intended to be applied to velocity-area methods that involve measurement of point velocities at a relatively small number of discrete depths and transverse positions in the flow crosssection, as described in ISO 748. This International Standard is not intended to be applied to measurements made by Acoustic Doppler Velocity Profilers (ADVP) or other instruments that produce essentially continuous velocity profiles of the flow field.

Describes the tracers used (fluorescein, rhodamine B, acid yellow 7, sulfo rhodamine B, pyranine, and rhodamine WT), the tracer measurement (principle, field measurement and laboratory measurements), environmental factors affecting tracers, techniques for tracer injection, sampling techniques, analysis and computation.

This European Standard applies to breath-alcohol testers, other than single use devices, which measure the concentration of alcohol contained in an exhaled breath sample. It defines the requirements and test methods to which breath alcohol testers shall comply.
The type approval procedure consists of a number of technical performance tests that are carried out on devices supplied by the manufacturers. The performance tests are detailed in this European Standard.

This European Standard specifies the design of a reference raingauge pit. The reference raingauge pit is designed for the liquid precipitation only. The specified details of the pit and the grating, are purposely kept to a minimum in order to allow each raingauge operator latitude in their construction and to suit local conditions.

This Technical Report defines the requirements for the use of snow mass registration devices for
measurement of SWE under natural environmental conditions. It includes weighing and pressure measuring methods.

This International Standard sets out provisions for the design, lay-out and installation of a pressure signal transmission system, whereby a pressure signal from a primary fluid flow device can be transmitted by known techniques to a secondary device safely and in such a way that the value of the signal is not distorted or modified.

This International Standard specifies the functional requireme nts of instrumentation for measuring the level of water surfac e (stage), primarily for the purpose of determining flow rates . This International Standard is supplemented by an annex prov iding guidance on the types of water level measurement devices currently available and the measurement uncertainty associate d with them (see Annex A).

This Technical Specification provides an understanding of the nature of measurement uncertainty and its significance in estimating the 'quality' of a measurement or a determination in hydrometry. It is applicable to flow measurements in natural and man-made channels. Rainfall measurements are not covered.

This International Standard gives terms, definitions and symbols used in standards in the field of
hydrometry.

This International Standard specifies methods for determining the velocity and cross-sectional area of water flowing in open channels without ice cover, and for computing the discharge therefrom. It covers methods of employing current-meters or floats to measure the velocities. It should be noted that although, in some cases, these measurements are intended to determine the stage-discharge relation of a gauging station, this International Standard deals only with single measurements of the discharge; the continuous recording of discharges over a period of time is covered in ISO 1100-1 and ISO 1100-2.

This standard covers the semantics (meaning) of data exchanged between data producers, users and databanks, independently from the software device and the formats used to exchange the files.
It provides a consistent set of terms defining selected objects and their related attributes.
The standard is not applicable to:
- data describing domestic uses (drinking water, waste water) or qualitative aspects ;
- real time data or data calculated from models;
- all the various characteristics on the organizations exchanging data concerned;
- debimetric measures.

ISO 9300:2005 specifies the geometry and method of use (installation in a system and operating conditions) of critical flow Venturi nozzles (CFVN) used to determine the mass flow-rate of a gas flowing through a system. It also gives the information necessary for calculating the flow-rate and its associated uncertainty. It is applicable to Venturi nozzles in which the gas flow accelerates to the critical velocity at the throat (this being equal to the local sonic velocity), and only where there is steady flow of single-phase gases.

Migrated from Progress Sheet (TC Comment) (2000-07-10): WIs CSF05019 to CSF05022 revises EN ISO 5167-1:1995 (CC/000707)

Migrated from Progress Sheet (TC Comment) (2000-07-10): WIs CSF05019 to CSF05022 revises EN ISO 5167-1:1995 (CC/000707)

Migrated from Progress Sheet (TC Comment) (2000-07-10): WIs CSF05019 to CSF05022 revises EN ISO 5167-1:1995 (CC/000707)

The present document sets the verification procedure for temperature recorders and thermometers for measuring the air and the products intended to equip the means used for the transport, storage and distribution of chilled, frozen, deep-frozen/quick-frozen food and ice cream and which comply with standards EN 12830 and EN 13485 (measurement classes and ranges).

This European Standard sets the technical and functional characteristics for all types of thermometers (electronic, mechanical, etc.) for equipping the means used for the transport, storage and distribution of chilled, frozen, deep-frozen/quick-frozen food and ice cream and for measuring the internal temperature of the products. It specifies the test methods which allows the verification of the equipment's conformity to suitability and performance requirements.

Migrated from Progress Sheet (TC Comment) (2000-07-10): ISO 4006

This European Standard specifies requirements and testing for dial indicating thermometers using sensing methods of gas expansion (symbol GE), liquid expansion (symbol LE) and bimetallic strip (symbol BM). Nominal sizes are from 40 to 160, and temperature measurement from -100 °C to +700 °C.
Thermometers specified have circular scales, and are for industrial use only.
Thermometers of square form are also covered by this standard except for case, scale and pointer dimensions.
Annex A includes recommendations for selection and installation.
This standard does not apply to thermometers for medical use nor to thermometers with electrical limit contact devices.