ISO 4064-1:2024 飲料用冷水および温水用の水道メーター — Part 1:計量および技術的要件 | ページ 5

3.1.1

water meter

instrument intended to measure, memorize, and display the volume of water passing through the measurement transducer (3.1.2) at metering conditions (3.2.11)

Note 1 to entry: A water meter includes at least a measurement transducer, a calculator (including adjustment or correction devices, if present) and an indicating device. These three devices can be in different housings.

Note 2 to entry: A water meter may be a combination meter (see 3.1.16).

Note 3 to entry: In this International Standard, a water meter is also referred to as a “meter”.

3.1.2

measurement transducer

part of the meter that transforms the flow rate (3.3.1) or volume of water to be measured into signals which are passed to the calculator (3.1.4) and includes the sensor (3.1.3)

Note 1 to entry: The measurement transducer may function autonomously or use an external power source and may be based on a mechanical, electrical or electronic principle.

3.1.3

sensor

element of a meter that is directly affected by a phenomenon, body or substance carrying a quantity to be measured

[SOURCE:ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 3.8, modified —"meter" replaces"measuring system"; original note to entry removed; original examples removed, “Note 1 to entry” added.]

Note 1 to entry: For a water meter, the sensor may be a disc, piston, wheel or turbine element, the electrodes on an electromagnetic meter, or another element. The element senses the flow rate or volume of water passing through the meter and is referred to as a"flow sensor" or"volume sensor".

3.1.4

calculator

part of the meter that transforms the output signals from the measurement transducer(s) (3.1.2) and, possibly, from associated measuring instruments and stores the results in memory until they are used

Note 1 to entry: The gearing is considered to be the calculator in a mechanical meter.

Note 2 to entry: The calculator may be capable of communicating both ways with ancillary devices.

3.1.5

indicating device

part of the meter that provides an indication corresponding to the volume of water passing through the meter

Note 1 to entry: For the definition of the term “indication”, see ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 4.1.

Note 2 to entry: In this International Standard, the volume of water passing through the meter refers to the accumulated volume.

3.1.6

adjustment device

part of the meter that allows an adjustment of the meter such that the error curve of the meter is generally shifted parallel to itself to fit in the envelope of the maximum permissible error(s) (3.2.5)

Note 1 to entry: For the definition of the term “adjustment of a measuring system”, see ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 3.11.

3.1.7

correction device

device connected to or incorporated in the meter for automatic correction of the volume of water at metering conditions (3.2.11) , by taking into account the flow rate (3.3.1) and/or the characteristics of the water to be measured and the pre-established calibration curves

Note 1 to entry: For the definition of the term “correction”, see ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 2.53.

3.1.8

ancillary device

device intended to perform a specific function, directly involved in elaborating, transmitting or displaying measured values

Note 1 to entry: For the definition of “measured value”, see ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 2.10.

Note 3 to entry: Depending on national regulations, ancillary devices may be subject to legal metrological control.

3.1.9

tariff control device

device that allocates measured values into different registers depending on tariff or other criteria, each register having the possibility to be read individually

3.1.10

pre-setting device

device that permits the selection of the quantity of water to be measured and which automatically stops the flow of water after the selected quantity has been measured

3.1.11

associated measuring instrument

instrument connected to the calculator (3.1.4) or the correction device (3.1.7) for measuring a quantity, characteristic of water, with a view to making a correction and/or a conversion

3.1.12

meter for two constant partners

meter that is permanently installed and only used for deliveries from one supplier to one customer

3.1.13

in-line meter

type of meter that is fitted into a closed conduit by means of the meter end connections provided

Note 1 to entry: The end connections may be flanged or threaded.

3.1.14

complete meter

meter whose measurement transducer (3.1.2) , calculator (3.1.4) , and indicating device (3.1.5) are not separable

3.1.15

combined meter

meter whose measurement transducer (3.1.2) , calculator (3.1.4) , and indicating device (3.1.5) are separable

3.1.16

combination meter

meter comprising one large meter, one small meter, and a changeover device that, depending on the magnitude of the flow rate (3.3.1) passing through the meter, automatically directs the flow through either the small or the large meter, or both

Note 1 to entry: The meter reading is obtained from two independent totalizers, or from one totalizer which adds up the values from both meters.

3.1.17

equipment under test

EUT

complete meter (3.1.14) , sub-assembly or ancillary device (3.1.8) that is subjected to a test

3.1.18

concentric meter

type of meter that is fitted into a closed conduit by means of a manifold

Note 1 to entry: The inlet and outlet passages of the meter and the manifold are coaxial at the interface between them.

3.1.19

concentric meter manifold

pipe fitting specific to the connection of a concentric meter (3.1.18)

3.1.20

cartridge meter

type of meter that is fitted into a closed conduit by means of an intermediate fitting called a connection interface

Note 1 to entry: The inlet and outlet passages of the meter and the connection interface are either concentric or axial as specified in ISO 4064-4^[5].

3.1.21

cartridge meter connection interface

pipe fitting specific to the connection of an axial or concentric cartridge meter (3.1.20)

3.1.22

meter with exchangeable metrological module

meter comprising a connection interface and an exchangeable metrological module (3.1.23) from the same type approval (3.4.13)

3.1.23

exchangeable metrological module

self-contained module comprising a measurement transducer (3.1.2) , a calculator (3.1.4) and an indicating device (3.1.5)

3.1.24

connection interface for meters with exchangeable metrological modules

pipe fitting specific to the connection of exchangeable metrological modules

3.1.25

non-adjustable water meter

water meter (3.1.1) whose indication cannot be altered in any way (e.g. without changing the internal dimensions and/or method of operation), and which has no adjustment device (3.1.6) or correction device (3.1.7) .

Note 1 to entry: This category should also include mechanical meters with an internal adjustment device where the adjustment cannot be altered at initial verification stage as the meter would need to be dismantled.

Note 2 to entry: The meter should not have a correction device, i.e. the indicating device of the meter should either be purely mechanical or be electronic but with a constant multiplying factor applied to the indication and set to the same value for all meters (such as a device which counts the number of rotations of the shaft and multiplies by a fixed value to give total volume passed).

3.1.26

adjustable water meter

water meter (3.1.1) that is connected to or incorporates an adjustment and/or correction device (3.1.7)

3.1.27

software-controlled water meter

water meter (3.1.1) that incorporates and utilizes legally relevant software modules

3.2.1

actual volume

V_a

total volume of water passing through the meter, disregarding the time taken

Note 1 to entry: This is the measurand.

Note 2 to entry: The actual volume is calculated from a reference volume as determined by a suitable measurement standard, taking into account differences in metering conditions, as appropriate.

3.2.2

indicated volume

V_i

volume of water indicated by the meter, corresponding to the actual volume

3.2.3

primary indication

indication which is subject to legal metrological control

3.2.4

error

measured quantity value minus a reference quantity value

[SOURCE:ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 2.16, modified — “error” replaces “measurement error”; original notes to entry removed; “Note 1 to entry” added, “Note 2 to entry” added.]

Note 1 to entry: For the application of this part of ISO 4064|OIML R 49, the indicated volume is considered as the measured quantity value and the actual volume as the reference quantity value. The difference between indicated volume and actual volume is referred to as: error (of indication).

Note 2 to entry: In this International Standard, the error (of indication) is expressed as a percentage of the actual volume, and is equal to:

3.2.5

maximum permissible error

MPE

extreme value of measurement error (3.2.4) , with respect to a known reference quantity value, permitted by specifications or regulations for a given meter

[SOURCE:ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 4.26, modified —"meter" replaces"measurement, measuring instrument, or measuring system"; original notes removed]

3.2.6

intrinsic error

error (3.2.4) of a meter determined under reference condition(s) (3.4.5)

[SOURCE:OIML D 11:2013, 3.8, modified —"a meter" replaces"indication"]

3.2.7

initial intrinsic error

intrinsic error (3.2.6) of a meter as determined prior to performance test(s) (3.4.6) and durability (3.2.10) evaluations

[SOURCE:OIML D 11:2013, 3.9, modified —"meter" replaces"measuring instrument"]

3.2.8

fault

difference between the error (3.2.4) (of indication) and the intrinsic error (3.2.6) of a meter

[SOURCE:OIML D 11:2013, 3.10, modified —"of indication" placed in parentheses;"meter" replaces"measuring instrument"; original notes removed]

3.2.9

significant fault

fault (3.2.8) greater than the value specified in this part of ISO 4064|OIML R 49

Note 1 to entry: See 5.1.2, which specifies the value of a significant fault.

3.2.10

durability

ability of a meter to maintain its performance characteristics over a period of use

[SOURCE:OIML D 11:2013, 3.18, modified —"meter" replaces"measuring instrument"]

3.2.11

metering conditions

conditions of the water, the volume of which is to be measured, at the point of measurement

3.2.12

first element of an indicating device

element which, in an indicating device (3.1.5) comprising several elements, carries the graduated scale with the verification scale interval

3.2.13

verification scale interval

lowest value scale division of the first element of an indicating device (3.2.12)

3.2.14

resolution of a displaying device

smallest difference between displayed indications that can be meaningfully distinguished

[SOURCE:ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 4.15, modified – “Note 1 to entry” added]

Note 1 to entry: For a digital indicating device, this is the change in the indication when the least significant digit changes by one step.

3.3.1

flow rate

Q

Q = dV/dt where Vis actual volume (3.2.1) and t is the time taken for this volume to pass through the meter

Note 1 to entry: ISO 4006:1991 ^[3], 4.1.2 prefers the use of the symbol q_V for this quantity, but Q is used in this International Standard as it is well established in the industry.

3.3.2

permanent flow rate

Q₃

highest flow rate (3.3.1) within the rated operating condition(s) (3.4.4) at which the meter is to operate within the maximum permissible error(s) (3.2.5)

Note 1 to entry: In this International Standard, flow rate is expressed in m³/h. See 4.1.3.

3.3.3

overload flow rate

Q₄

highest flow rate (3.3.1) at which the meter is to operate for a short period of time, within the maximum permissible error(s) (3.2.5) , while maintaining its metrological performance when it is subsequently operating within the rated operating condition(s) (3.4.4)

Note 1 to entry: the definition of short period of time can vary between economies and/or applications, but for example 2 hours in a 24 hours period.

3.3.4

transitional flow rate

Q₂

flow rate (3.3.1) between the permanent flow rate (3.3.2) and the minimum flow rate (3.3.5) that divides the flow rate range into two zones, the upper flow rate zone and the lower flow rate zone, each characterized by its own maximum permissible error(s) (3.2.5)

3.3.5

minimum flow rate

Q₁

lowest flow rate (3.3.1) at which the meter is to operate within the maximum permissible error(s) (3.2.5)

3.3.6

combination meter changeover flow rate

Q_x

flow rate (3.3.1) at which the flow in the larger meter stops with decreasing flow rate (Q_x1) or starts with increasing flow rate (Q_x2)

3.3.7

minimum admissible temperature

mAT

minimum water temperature that a meter can withstand permanently, within its rated operating condition(s) (3.4.4) , without deterioration of its metrological performance

Note 1 to entry: mAT is the lower of the rated operating conditions for temperature.

3.3.8

maximum admissible temperature

MAT

maximum water temperature that a meter can withstand permanently, within its rated operating condition(s) (3.4.4) , without deterioration of its metrological performance

Note 1 to entry: MAT is the upper of the rated operating conditions for temperature.

3.3.9

maximum admissible pressure

MAP

maximum internal pressure that a meter can withstand permanently, within its rated operating condition(s) (3.4.4) , without deterioration of its metrological performance

3.3.10

working temperature

T_w

water temperature in the pipe measured upstream of the meter

3.3.11

working pressure

p_w

average water pressure (gauge) in the pipe measured upstream and downstream of the meter

3.3.12

pressure loss

Δp

irrecoverable decrease in pressure, at a given flow rate (3.3.1) , caused by the presence of the meter in the pipeline

3.3.13

test flow rate

mean flow rate (3.3.1) during a test, calculated from the indications of a calibrated reference device

3.3.14

nominal diameter

DN

alphanumeric designation of size for components of a pipework system, which is used for reference purposes

Note 1 to entry: The nominal diameter is expressed by the letters DN followed by a dimensionless whole number which is indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connections.

Note 2 to entry: The number following the letters DN does not represent a measurable value and should not be used for calculation purposes except where specified in the relevant standard.

Note 3 to entry: In those standards which use the DN designation system, any relationship between DN and component dimensions should be given, e.g. DN/OD or DN/ID.

3.4.1

influence quantity

quantity that, in a direct measurement, does not affect the quantity that is actually measured, but affects the relation between the indication and the measurement result

[SOURCE:ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM) 2.52, modified – original examples and notes removed; “EXAMPLE” added]

3.4.2

influence factor

influence quantity (3.4.1) having a value which ranges within the rated operating condition(s) (3.4.4) of a meter specified in this part of ISO 4064|OIML R 49

[SOURCE:OIML D 11:2013, 3.15.1, modified —"meter" replaces"measuring instrument";"specified in this part of ISO 4064|OIML R 49" is added; original notes removed]

3.4.3

disturbance

influence quantity (3.4.1) having a value within the limits specified in this part of ISO 4064|OIML R 49, but outside the specified rated operating condition(s) (3.4.4) of the meter

[SOURCE:OIML D 11:2013, 3.15.2, modified —"this part of ISO 4064|OIML R 49" replaces"the applicable Recommendation";"meter" replaces"measuring instrument"; original notes removed; “Note 1 to entry” added]

Note 1 to entry: An influence quantity is a disturbance if the rated operating conditions for that influence quantity are not specified.

3.4.4

rated operating condition

ROC

operating condition requiring fulfilment during measurement in order that a meter perform as designed

[SOURCE:ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 4.9, modified —"requiring fulfilment" replaces"that must be fulfilled";"meter" replaces"measuring instrument or measuring system"; “Note 1 to entry” replaces the original note]

Note 1 to entry: The rated operating conditions specify intervals for the flow rate and for the influence quantities for which the errors (of indication) are required to be within the maximum permissible errors.

3.4.5

reference condition

operating condition prescribed for evaluating the performance of a meter or for comparison of measurement results

[SOURCE:ISO/IEC Guide 99:2007|OIML V 2-200:2012 (VIM), 4.11, modified —"meter" replaces"measuring instrument or measuring system"; original notes removed]

3.4.6

performance test

test intended to verify whether the equipment under test (3.1.17) is able to accomplish its intended functions

[SOURCE:OIML D 11:2013, 3.21.4]

3.4.7

durability test

test intended to verify whether the equipment under test (3.1.17) is able to maintain its performance characteristics over a period of use

[SOURCE:OIML D 11:2013, 3.21.5]

3.4.8

temperature stability

condition in which all parts of the equipment under test (3.1.17) have a temperature within 3 °C of each other, or as otherwise specified in the relevant specification of its final temperature

3.4.9

preconditioning

treatment of the equipment under test (3.1.17) with the objective of eliminating or partially counteracting the effects of its previous history

Note 1 to entry: Where called for, this is the first process in a test procedure.

3.4.10

conditioning

exposure of the equipment under test (3.1.17) to an environmental condition ( influence factor (3.4.2) or disturbance (3.4.3) ) in order to determine the effect of such a condition on it

3.4.11

recovery

treatment of the equipment under test (3.1.17) , after conditioning (3.4.10) , in order that its properties can be stabilized before measurement

3.4.12

type evaluation

systematic examination and testing of the performance of one or more specimens of an identified type of measuring instruments against documented requirements, the results of which are contained in the evaluation report, in order to determine whether the type may be approved

3.4.13

type approval

decision of legal relevance, based on the evaluation report, that the type of a measuring instrument complies with the relevant statutory requirements and is suitable for use in the regulated area in such a way that it is expected to provide reliable measurement results over a defined period of time

3.5.1

electronic device

device employing electronic sub-assemblies and performing a specific function, usually manufactured as a separate unit and capable of being tested independently

Note 1 to entry: An electronic device may be a complete meter or a part of a meter, e.g. as defined in 3.1.1 to 3.1.5 and 3.1.8.

3.5.2

electronic sub-assembly

part of an electronic device (3.5.1) , employing electronic component(s) (3.5.3) and having a recognizable function of its own

3.5.3

electronic component

smallest physical entity that uses electron or hole conduction in semi-conductors, gases or in a vacuum

3.5.4

checking facility

facility that is incorporated in a meter and which enables significant fault(s) (3.2.8) to be detected and acted upon

[SOURCE:OIML D 11:2013, 3.19, modified —"meter" replaces"measuring instrument"; “Note 3 to entry” added]

Note 2 to entry: “Act upon” refers to any adequate response by the measuring instrument (for example: a luminous signal, an acoustic signal, interruption or blocking of the measurement process, etc.).

Note 3 to entry: The checking of a transmission device aims to verify whether all the information which is transmitted (and only that information) is fully received by the receiving equipment.

3.5.5

automatic checking facility

checking facility (3.5.4) that operates without the intervention of an operator

[SOURCE:OIML D 11:2013, 3.19.1]

3.5.6

permanent automatic checking facility

type P automatic checking facility

automatic checking facility (3.5.5) that operates at each measurement cycle

[SOURCE:OIML D 11:2013, 3.19.1.1, modified — Synonym presentation]

3.5.7

intermittent automatic checking facility

type I automatic checking facility

automatic checking facility (3.5.5) that operates at certain time intervals or per fixed number of measurement cycles

[SOURCE:OIML D 11:2013, 3.19.1.2, modified — Synonym presentation]

3.5.8

non-automatic checking facility

type N checking facility

checking facility (3.5.4) that requires the intervention of an operator

[SOURCE:OIML D 11:2013, 3.19.2, modified — Synonym presentation]