Evidential breath analyzers
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O I M L
R 126 E d i t i o n 1998 (E )
OIML R 126
Edition 1998 (E)
I NTERNATIONAL R ECOMMENDATION
Contents
Foreword (3)
1Scope (4)
2Applications (4)
3Terminology (4)
4Units of measurement (5)
5Metrological requirements (5)
6Technical requirements (7)
7Practical instructions (10)
8Metrological controls (10)
9Test method (11)
Annex A Influence of variations of the parameters which characterize the test gas (14)
Annex B Physical influence factors (15)
Annex C Physiological influence factors (17)
Annex D Physical disturbances (18)
Annex E Test report format (22)
Annex F Evolution of concentration with time (31)
Annex G General example of an apparatus for testing evidential breath analyzers (33)
一般考研多少分能考上Annex H Test simulating the prence of ethanol in the upper respiratory tracts (37)
Annex I Measuring cycle (38)
T
he International Organization of Legal Metrology (OIML) is a worldwide, intergovernmental organization who primary aim is to harmonize the regulations and metrological controls applied by the national metro-logical rvices, or related organizations, of its Member States.
The two main categories of OIML publications are:
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英语教育•International Recommendations (OIML R), which are model regulations that establish the metrological charac-teristics required of certain measuring instruments and which specify methods and equipment for checking their conformity; the OIML Member States shall implement the Recommendations to the greatest possible extent;•International Documents (OIML D), which are info
rm-ative in nature and intended to improve the work of the metrological rvices.OIML Draft Recommendations and Documents are de-veloped by technical committees or subcommittees which are formed by the Member States. Certain international and regional institutions also participate on a consultation basis.
Cooperative agreements are established between OIML and certain institutions, such as ISO and IEC, with the objective of avoiding contradictory requirements; conquently, manu-facturers and urs of measuring instruments, test labo-ratories, etc. may apply simultaneously OIML publications and tho of other institutions.
International Recommendations and International Docu-ments are published in French (F) and English (E) and are subject to periodic revision.
This publication - reference OIML R 126, edition 1998 (E) -was developed by the OIML subcommittee TC 17/SC 7Breath Testers . It was approved for final publication by the International Committee of Legal Metrology in 1997, and will be submitted to the International Conference of Legal Metrology in 2000 for formal sanction.
OIML publications may be obtained from the Organization’s headquarters:
Bureau International de Métrologie Légale 11, rue Turgot - 75009 Paris - France
Telephone: 33 (0)1 48 78 12 82 and 42 85 27 11Fax: 33 (0)1 42 82 17 27E-mail: biml@oiml
Foreword
1Scope
1.1This International Recommendation applies to evidential breath analyzers (hereafter referred to as EBA’s) which are instruments that automatically measure the mass concentration of alcohol in exhaled breath.学ui培训学校
However, for the purpo of this Recommendation,only ethanol is considered as alcohol.
In fact, physiological phenomena associated with alcohol and, in particular, the definition of that which constitutes the offence of driving (or working, etc.)under the influence of alcohol are not within the scope of this Recommendation. Likewi the legal definition of which compounds (methanol, ethanol, propanol,etc.) constitute alcohol is not provided in this Recom-mendation, such considerations being established by the responsible authorities of each country.wake me up when ptember ends mv
1.2This Recommendation does not apply to screening devices which only detect ethanol without providing a sufficiently accurate measurement (e
2.2).
1.3The performance requirements given here apply to EBA’s using currently available technology. This is not intended to restrict technical development nor exclude the u of other technologies as a means for analysis.1.4National authorities may require EBA’s to include a specific conversion device that converts the measure-ment result obtained in terms of ethanol content in the exhaled breath at the measuring conditions either into physiological conditions or in terms of other quant-ities. This Recommendation does not cover the metro-logical performance of such devices.
1.5The purpo of this Recommendation is to define the performance requirements of EBA’s and the means and methods employed in testing them.
2Applications
2.1EBA’s can be ud to measure accurately and display numerically the breath alcohol mass concen-tration of persons (drivers, workers, etc.) who may have consumed alcohol.
2.2Screening devices are not generally ud for establishing proof of driving under the influence of alcohol but are ud as detectors of alcohol in the breath.
3
Terminology
3.1
Evidential breath analyzer (EBA)
An instrument which measures the mass concentra-tion of ethanol by analyzing deep lung air, usable for evidential purpos.3.2
Non-portable evidential breath analyzer
An EBA intended only for u within buildings or places providing similar environmental conditions.Note:The u of non-portable EBA’s in mobile labo-ratories may be considered, providing adapted conditions of transport are assured.3.3
Portable evidential breath analyzer
An EBA that may be ud within or outside a building.3.4
Deep lung air
Breath delivered from the mouth of a subject that originates from the alveoli of the lungs, normally referred to as end-expiratory breath.3.5
Alveolar air
Air contained in the pulmonary alveoli.3.6
Normal operation
freewayThe mode of usage which corresponds to the program of operations specified for EBA’s in rvice.3.7
Stand-by mode
The mode of the EBA in which only certain circuits are energized in order to conrve power and/or prolong component life, and to attain the measuring mode more rapidly than would be possible if starting
from the un-powered state.
Evidential breath analyzers
3.8Measuring mode
The clearly marked mode in which the EBA can make measurements at the rate normally expected in rvice and in which it shall meet the performance require-ments of this Recommendation.
Note:The measuring mode and the stand-by mode
(3.7) are modes of normal operation (3.6).3.9
Device for adjustment to a standard
A device for adjusting the EBA using, as a standard, a mixture of gas having a relative humidity of at least 90% and a temperature of 34°C ±1°C (*). The mixture of air and ethanol pass through the
entire gas analysis train, starting with the mouthpiece, in the direction normally taken by exhaled air.
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Note:Adjustment using a dry gas is possible provided
that the difference of effect between wet and dry gas is known or can be automatically cor-rected.3.10
Device for adjustment by simulation
A device for adjusting the EBA by a procedure other than that specified in 3.9, notably by the simulation of the effects of the passage of a standard mixture of gas as described in 3.9.3.11
Adjustment-checking operation
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An operation involving all relevant internal elements which verifies that the EBA is suitably adjusted.3.12
Drift
The change in the indication which occurs during a stated period of time at a given mass concentration of ethanol in air.3.13
Memory (residual) effect
The difference between the indications obtained with two inputs of gas of a given mass concentration, a gas of a specified higher mass concentration being in-jected between the two inputs.
4
Physical quantities and units of measurement
EBA’s shall be capable of expressing measurement results in terms of ethanol content in the exhaled breath at measuring conditions, for example mass concentration of ethanol per unit volume.
In this Recommendation, the unit of measurement ud is the milligram (of ethanol) per litre (of exhaled breath), mg/L.
5Metrological requirements
The requirements of clau 5 are applicable to indi-vidual measurements and not to any combination of measurements of a measuring cycle.5.1
Maximum permissible errors
5.1.1Maximum permissible errors for pattern
evaluation and initial verification The maximum permissible errors, positive or negative,on each indication shall be:
•0.020 mg/L for all mass concentrations less than 0.400 mg/L;
汪峰组冠军之战•5% of the measured concentration for all mass concentrations greater than or equal to 0.400 mg/L and less than or equal to 2.000 mg/L;
•20% of the measured concentration for all mass concentrations greater than 2.000mg/L.
5.1.2Maximum permissible errors for EBA’s in rvice The recommended values of maximum permissible errors, positive or negative, on each indication for EBA’s in rvice are:
•0.032 mg/L for all mass concentrations less than 0.400 mg/L;
•8% of the measured concentration for all mass concentrations greater than or equal to 0.400 mg/L and less than or equal to 2.000 mg/L;
•30% of the measured concentration for all mass concentrations greater than 2.000mg/L.5.1.3Rounding
When comparing the error of an EBA with the cor-
responding maximum permissible error, this mpe shall
