ISO 17179:2016 定常発生源排出量 — 煙道ガス中のアンモニアの質量濃度の決定 — 自動測定システムの性能特性 | ページ 6

3.1

analyser

analytical part in an extractive or in situ AMS (3.3)

[SOURCE:ISO 12039:2001, 3.3]

3.2

automated measuring system

AMS

measuring system interacting with the flue gas under investigation, returning an output signal proportional to the physical unit of the measurand (3.11) in unattended operation

Note 1 to entry: In the sense of this International Standard, an AMS is a system that can be attached to a duct or stack to continuously or intermittently measure the mass concentration of NH₃ passing through the duct.

[SOURCE:ISO 9169:2006, 2.1.2, modified.]

3.3

in situ AMS

non-extractive systems that measure the concentration directly in the duct or stack

Note 1 to entry:In situ systems measure either across the stack or duct or at a point within the duct or stack.

3.4

calibration of an automated measuring system

procedure for establishing the statistical relationship between values of the measurand (3.11) indicated by the automated measuring system (3.2) and the corresponding values given by an independent method of measurement implemented simultaneously at the same measuring point

3.5

efficiency of NH₃/NO

efficiency of a converter which oxidizes NH₃ to NO

3.6

efficiency of NH₃/N₂

efficiency of a converter which reduces NH₃ to N₂

3.7

influence quantity

quantity that is not the measurand (3.11) but that affects the result of the measurement

[SOURCE:ISO/IEC Guide 98‑3:2008, B.2.10]

3.8

interference

cross-sensitivity

negative or positive effect upon the response of the measuring system, due to a component of the sample that is not the measurand (3.11)

3.9

interferent

interfering substance

substance present in the air mass under investigation, other than the measurand (3.11) , that affects the response

[SOURCE:ISO 9169:2006, 2.1.12]

3.10

lack-of-fit

systematic deviation within the range of application between the measurement results obtained by applying the calibration function to the observed response of the measuring system, measuring reference materials (3.16) and the corresponding accepted value of such reference materials

Note 1 to entry: Lack of-fit may be a function of the measurement result.

Note 2 to entry: The expression “lack-of-fit” is often replaced in everyday language for linear relations by “linearity” or “deviation from linearity”.

[SOURCE:ISO 9169:2006, 2.2.9, modified.]

3.11

measurand

particular quantity subject to measurement

[SOURCE:ISO/IEC Guide 98‑3:2008, B.2.9, modified.]

3.12

no₂/NO converter efficiency

efficiency with which the converter unit of a NO_x analyser reduces NO₂ to NO

3.13

performance characteristic

one of the quantities assigned to equipment in order to define its performance

Note 1 to entry: Performance characteristics can be described by values, tolerances, or ranges.

3.14

period of unattended operation

maximum interval of time for which the performance characteristics (3.13) remain within a predefined range without external servicing, e.g. refill, adjustment

Note 1 to entry: The period of unattended operation is often called maintenance interval.

[SOURCE:ISO 9169:2006, 2.2.11]

3.15

reference gas

gaseous mixture of stable composition used to calibrate the measuring system and which is traceable to national or international standards

3.16

reference material

rm

substance or mixture of substances with a known concentration within specified limits, or a device of known characteristics

Note 1 to entry: Normally used are calibration gases, gas cells, gratings, or filters.

[SOURCE:ISO 14385‑1:2014, 3.20]

3.17

reference method

measurement method taken as a reference by convention, which gives the accepted reference value of the measurand (3.11)

3.18

transport time in the measuring system

time period for transportation of the sampled gas from the inlet of the probe to the inlet of the measurement instrument

3.19

response time

time interval between the instant when a stimulus is subjected to a specified abrupt change and the instant when the response reaches and remains within specified limits around its final stable value, determined as the sum of the lag time and the rise time in the rising mode, and the sum of the lag time and the fall time in the falling mode

Note 1 to entry: Lag time, rise time and fall time are defined in ISO 9169:2006.

[SOURCE:ISO 9169:2006, 2.2.4]

3.20

span gas

gas or gas mixture used to adjust and check the span point (3.21) on the response line of the measuring system

Note 1 to entry: This concentration is often chosen around 70 % to 80 % of full scale.

3.21

span point

value of the output quantity (measured signal) of the automated measuring system (3.2) for the purpose of calibration, adjustment, etc. that represents a correct measured value generated by reference material (3.16)

3.22

standard uncertainty

uncertainty (3.23) of the result of a measurement expressed as a standard deviation

[SOURCE:ISO/IEC Guide 98‑3:2008, 2.3.1]

3.23

uncertainty (of measurement)

parameter, associated with the result of a measurement, that characterizes the dispersion of the values that could reasonably be attributed to the measurand (3.11)

[SOURCE:ISO/IEC Guide 98‑3:2008, 2.2.3]

3.24

validation of an automated measuring system

procedure to check the statistical relationship between values of the measurand (3.11) indicated by the automated measuring system (3.2) and the corresponding values given by an independent method of measurement implemented simultaneously at the same measuring point

3.25

zero gas

gas or gas mixture used to establish the zero point (3.26) on a calibration curve within a given concentration range

[SOURCE:ISO 12039:2001, 3.4.2]

3.26

zero point

specified value of the output quantity (measured signal) of the AMS (3.2) and which, in the absence of the measured component, represents the zero crossing of the calibration line