ISO 14385-1:2014 定常発生源排出量 — 温室効果ガス — Part 1: 自動測定システムの校正 | ページ 6

3.1

automated measuring system

AMS

measuring system permanently installed on site for continuous monitoring of emissions

Note 1 to entry: An AMS is a method which is traceable to a reference method.

Note 2 to entry: Apart from the analyser, an AMS includes facilities for taking samples (e.g. sample probe, sample gas lines, filters, flow meters, regulators, delivery pumps, blowers) and for sample conditioning (e.g. dust filter, water vapour removal devices, converters, diluters). This definition also includes testing and adjusting devices that are required for regular functional checks.

3.2

calibration function

linear relationship between the values of the SRM and the AMS with the assumption of a constant residual standard deviation

3.3

calibration gas

gas of known composition that can be used to check the response of the AMS

3.4

competent authority

organization or organizations which implement the requirements of legislation and regulate installations which must comply with the requirements of legislation

3.5

confidence interval

interval estimator (T₁, T₂) for the parameter θ with the statistics T₁ and T₂ as interval limits and for which it holds that P[T₁ < θ < T₂] ≥ 1 – α

Note 2 to entry: In this part of ISO 14385, the standard deviation, σ_0, is estimated by parallel measurements with an SRM. It is assumed that the requirement for σ₀, presented in terms of an allowable uncertainty budget, i.e. variability is provided by the regulators. In the procedures of this part of ISO 14385, the premise is that the required variability is given as σ₀ itself, or as a quarter of the length of the full 95 % confidence interval.

[SOURCE: ISO 3534‑1:2006, 1.28, modified: Figure 1 has been added. Notes 1 and 2 are different.]

3.6

drift

monotonic change of the calibration function over stated maintenance interval, which results in a change of the measured value

3.7

extractive AMS

AMS having the detection unit physically separated from the gas stream by means of a sampling system

3.8

in-situ AMS

AMS having the detection unit in the gas stream, or in a part of it

3.9

instrument reading

indication of the measured value directly provided by the AMS without using the calibration function

3.10

legislation

directives, acts, ordinances, and regulations

3.11

low-level cluster

cluster of measurement values less than the maximum permissible uncertainty and between 0 % and 15 % of the lowest measuring range

3.12

measurand

particular quantity subject to measurement^[5]

3.13

measured component

constituent of the waste gas for which a defined measurand is to be determined by measurement

3.14

measured value

estimated value of the measurand derived from an output signal

Note 1 to entry: This usually involves calculations related to the calibration process and conversion to required quantities

Note 2 to entry: A measured value is a short-term average. The averaging time can be, e.g. 10 min, 30 min, or 1 h.

3.15

period of unattended operation

maximum admissible interval of time for which the performance characteristics will remain within a predefined range without external servicing, e.g. refill, calibration, adjustment

Note 1 to entry: This is also known as the maintenance interval.

3.16

peripheral parameter

specified physical or chemical quantity which is needed for conversion of the AMS measured value to standard conditions

3.17

peripheral AMS

AMS used to gather the data required to convert the AMS measured value to standard conditions

Note 1 to entry: A peripheral AMS is used to measure water vapour, temperature, pressure, and oxygen.

3.18

peripheral SRM

SRM used to gather the data required to convert the SRM measured values to AMS or standard conditions

Note 1 to entry: A peripheral SRM is used to measure water vapour, temperature, pressure, and oxygen.

3.19

precision

closeness of agreement of results obtained from the AMS for successive zero readings and successive span readings at defined time intervals

3.20

reference material

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.

3.21

response time

t90

time interval between the instance of a sudden change in the value of the input quantity to an AMS and the time as from which the value of the output quantity is reliably maintained above 90 % of the correct value of the input quantity

Note 1 to entry: The response time is also referred to as the 90 % time.

3.22

span reading

instrument reading of the AMS for a simulation of the input parameter at a fixed elevated concentration. This simulation should test as much as possible all the measuring elements of the system, which contribute significantly to its performance.

Note 1 to entry: The span reading is approximately 80 % of the measured range.

3.23

standard conditions

conditions as given in legislation to which measured values have to be standardized

3.24

standard deviation

positive square root of the mean squared deviation from the arithmetic mean, divided by the degrees of freedom

Note 1 to entry: The number of degrees of freedom is the number of measurements minus 1.

3.25

Standard Reference Method

SRM

method described and standardised to define a measurand, temporarily conducted on site for verification purposes

Note 1 to entry: Also known as a reference method.

3.26

uncertainty

parameter associated with the result of a measurement that characterises the dispersion of the values that could reasonably be attributed to the measurand^[5]

3.27

variability

standard deviation of the differences of parallel measurements between the SRM and AMS

3.28

zero reading

instrument reading of the AMS on simulation of the input parameter at zero concentration, which shall test as much as possible all the measuring elements of the AMS, that contribute significantly to its performance