Issued by the
Administrator of Vehicle Standards
in consultation with the
Australian Motor Vehicle Certification Board
comprising Commonwealth, State and Territory representatives
CIRCULAR 0-12-3
GENERAL REQUIREMENTS FOR CALIBRATION
OF TEST EQUIPMENT AND INSTRUMENTATION
This Circular is relevant to the Third Edition of the
Australian Design Rules gazetted as
National Standards under the Motor Vehicle Standards Act 1989
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TEST PROCEDURES
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CONTENTS
Page
1 INTRODUCTION
5
2 DEFINITIONS
2.1 True Value
2.2 Accepted True Value
2.3 Accuracy
2.4 Uncertainty of Measurement
2.5 Measurement Standard
2.6 National Standard
2.7 Traceability
2.8 Calibration
5
5
5
5
5
5
5
5
5
3 REQUIREMENTS
5
4 CALIBRATION MANAGEMENT SYSTEMS
4.1 Calibration Intervals
4.2 Personnel
4.3 Traceability
4.4 Uncertainty of Measurement
4.5 Repairs, Servicing and Maintenance
5
5
6
6
6
6
5 DOCUMENTATION
5.1 Calibration Procedures
5.2 Calibration Records
5.3 Calibration Schedule
5.4 Labelling
6
6
6
6
6
6 ACKNOWLEDGEMENTS
6
7 REFERENCES
7
ANNEX 1 General ADR Tests
8
ANNEX 2 Vehicle Emission Tests
15
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TEST PROCEDURES
the measuring instrument.
1 INTRODUCTION
The basic requirement for measurements made in Test
Facilities for demonstration of compliance with
Australian Design Rules is that the measurement should
be of an accuracy such that compliance is clearly
demonstrated. In order to assure this, it is necessary that
test equipment and instruments be calibrated with
traceability to a National Standard and that the
uncertainty of measurement should be known. The
following calibration requirements are based on those
specified in Australian Standard 2415-1980, Calibration
Systems Requirements. This Standard is compatible with
United States Military Standard MIL-STD-45662-June
1980.
2 DEFINITIONS
The following definitions are provided so that inspectors
may have a clear understanding of the requirements
expressed in this Circular. Inspectors should be aware
that test facilities may use other nomenclature but in such
cases the same principles should apply.
2.1 True Value
“True Value” is the value which characterizes a quantity
perfectly defined.
2.2 Accepted True Value
“Accepted True Value” is a value found by measurement
approximating the true value of a quantity such that, for
the purpose for which that value is used, the difference
between them can be neglected.
2.3 Accuracy
“Accuracy” is a qualitative term describing the degree of
closeness with which the indications of a measuring
equipment approach the true value of the quantity
measured.
2.4 Uncertainty of Measurement
“Uncertainty of Measurement” is that part of the
expression of the corrected result of a measurement
which defines the range of values within which the
accepted true value is estimated to lie.
2.5 Measurement Standard
A “Measurement Standard” is a measuring instrument or
equipment which physically defines a unit of
measurement or value of a quantity.
2.6 National Standard
A “National Standard” is a standard recognized by a
national decision as the basis of fixing a value in a
country of all other standards of that quantity.
2.7 Traceability
“Traceability” is the concept of establishing a valid
calibration of a measuring instrument by step by step
comparison with better standards up to a National
Standard.
2.8 Calibration
“Calibration” is all the operations in the process which is
necessary to ensure that a measuring system is producing
a known acceptable accuracy including determining the
values of the errors and uncertainty of measurement of
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3 REQUIREMENTS
The principle used to assess whether a measurement
provides demonstration of compliance with the
Australian Design Rules is that the accepted true value of
the measured quantity plus the uncertainty of
measurement must be within the requirements of the
ADR.
To meet this requirement all measuring equipment must
be in a known state of calibration at the time that a test is
conducted.
In order to minimize the effect of this requirement on test
facility operations, it is not required that calibration of
measuring equipment be undertaken before each test.
Where a particular piece of measuring equipment is used
infrequently it need not be maintained in a state of
calibration and thus calibration before each test will be
required. However, when equipment is being used
regularly it is acceptable that a calibration was done
within a period for which the test facility is confident that
the calibration data remains valid.
4 CALIBRATION MANAGEMENT SYSTEMS
A calibration management system should be planned,
established and maintained to provide effective control
over all measuring equipment and standards. Calibrations
may be conducted either internally or externally but
where the calibration service is provided by an external
service the test facility must nevertheless maintain
control over the equipment’s calibration interval,
maintain appropriate records and ensure by means of
assurance from the calibration service that calibrations
are conducted to correct procedures.
4.1 Calibration Intervals
To aid in the orderly inspection and assessment of Test
Facilities carrying out tests demonstrating compliance
with Australian Design Rules, tables have been prepared
listing the equipment and instrumentation expected to be
encountered in such testing together with suggested
calibration intervals, and standards and references, where
appropriate, for the calibration method. Where the
measuring instrument is of a design for which there is a
substantial body of experience these guidelines or any
alternative period given by the equipment manufacturer
will provide the test facility with the necessary
confidence that the calibration will remain valid for the
period. If the test facility uses measuring equipment for
which it does not have experience or cannot make use of
experience gained elsewhere it should undertake a
program to build up such confidence. The quality of the
equipment will be a factor in the determination of an
appropriate calibration interval.
The calibration periods given in the tables are provided as
guidelines. If inspectors find that a test facility uses
longer periods they should seek a justification for the
period used. Such longer periods are acceptable if the
facility is able to justify them by means of a history of
calibrations which show that the measuring instrument
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TEST PROCEDURES
retains valid calibration data over that period.
Most calibrations, in the attached tables, will be carried
out by test facility staff experienced in such work and are
marked with an asterisk in the tables.
Calibrations usually of a specialist nature may also be
carried out by an accredited Testing Facility
The listings consist of
General ADR Tests
Annex 1
Vehicle Emission Tests
Annex 2
The calibration frequency and standards referred to in the
tables are similar to those employed by the National
Association of Testing Authorities (NATA) in Australia
when assessing laboratories for registration in appropriate
fields of testing.
4.2 Personnel
The person in charge of calibration work should be
suitably qualified for and experienced in the work
involved. All other personnel engaged in calibration work
shall be suitably trained for effective performance of their
duties and be competent in those duties.
4.3 Traceability
All relevant functions of the measuring equipment used
by a test facility shall be calibrated over the ranges of
values for which they are used, against measurement
standards whose calibration is traceable to a National
Standard.
4.4 Uncertainty of Measurement
Where measuring equipment is calibrated against
measurement standards which are themselves calibrated
against other standards traceable to a National Standard
the uncertainty resulting from each step in this process
shall be taken into account in determining the uncertainty
of measurement of the test equipment. There is no
specific requirement that measurements taken for the
purpose of demonstration of compliance be of any
particular accuracy provided that, as stated above, the
accuracy is such that the accepted true value plus
uncertainty fall within the ADR requirement. However it
would normally be expected that a reasonable
commercial level of accuracy was achieved in those
facilities conducting ADR tests.
4.5 Repairs, Servicing and Maintenance
All items of measuring equipment should be handled so
as to reduce to a minimum the possibility of damage.
Where calibration of an equipment requires an
adjustment, such adjustment should be sealed to prevent
the adjustment from being inadvertently changed or
tampered with. The calibration management system
should ensure that any repair which affects the measuring
function of an instrument or any evidence that a
calibration adjustment has changed results in a further
calibration being conducted.
A programme of preventive maintenance for test and
measuring equipment should be established and
maintained to ensure continued reliability.
CIRCULAR 0-12-3
New equipment should not be placed in service until its
accuracy, performance and calibration has been checked.
5 DOCUMENTATION
A Calibration Management System should ensure that
calibrations are done when required and to the
appropriate procedure and that the calibration status of
the test equipment should be readily apparent to the user.
5.1 Calibration Procedures
Documented procedures should be prepared and used for
the calibration of all measuring equipment used by the
test facility and for all corresponding measurement
standards. The procedures should be published standard
practices where these are available and appropriate, and
should, in addition, be compatible with the equipment
manufacturer’s instructions.
5.2 Calibration Records
A calibration record should be maintained for each item
of test equipment. It should include the following:
5.2.1 Description of the equipment i.e.
manufacturer’s name, model, serial number
5.2.2 The means by which the equipment can be
uniquely identified i.e. an identification or serial
number.
5.2.3 Calibration interval and date due for next
calibration
5.2.4 The applicable calibration procedure
5.2.5 A history of calibrations including any
adjustments performed during calibration
5.2.6 Calibration values i.e. accuracy class or
uncertainty
5.3 Calibration Schedule
A schedule of the times at which calibration should be
done on the various items of test equipment used by the
facility should be maintained. Where the schedule
includes instruments which should be calibrated on a
routine basis it should be monitored to ensure that such
instruments are calibrated at the appropriate interval.
5.4 Labelling
The calibration status of each item of test equipment
should be readily available to the user of the equipment.
One means by which this can be achieved is to attach a
label to the equipment which gives its identification
number, calibration interval and the date when the next
calibration is due.
6 ACKNOWLEDGEMENTS
Certain parts of this document are based on Australian
Standard 2415-1980 Calibration System Requirements.
The Calibration data given in the Annexes has been
collated from recommendations made by the National
Association of Testing Authorities, Australia and
published in its “Guides to Assessors”.
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TEST PROCEDURES
Australian Standards 3903-1987/ISO 9003-1987 Quality
Systems for Final Inspection and Test
7 REFERENCES
Australian Standards 3901 - 1987/ISO 9001 - 1987
Quality Systems for Design, Development Production,
Installation and Servicing
Australian Standards 3904-1987/ISO 9004-1987 Quality
Systems - Guide to Quality Management and Quality
System Elements.
Australian Standards 3902 -1987/ISO9002-1987 Quality
Systems for Production and Installation
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Australian Standard 2415 - 1980 Calibration System
Requirements
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TEST PROCEDURES
ANNEX 1
GENERAL ADR TESTS
Standards for Test Facility Equipment, Instrumentation and Calibration
CONTENTS
Accelerometer
Ammeters
Balance
Barometer
Dial Gauges
Extensometers
Force Testing Machines
Type 1 Mechanical Force Measuring System
Type 2 Hydraulic or Pneumatic Force Measuring System and Vacuum Testers
Type 3 Electrical Force Measuring System
Gauge Blocks
Hardness Testers for Metals
Hardness Testers for Rubber, Plastics and Ebonite
Load Cells
Masses
Micrometers
Photometers
Pressure and Vacuum Gauges
and Gauge Testers
Proving Devices for Calibration of Force Testing Machines
Relative Humidity
Sound Level Meters
Steam Generators
Stop Watches
Thermometers
Tachometers
Vehicle Speed and Distance
Velocity
Voltmeters
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TEST PROCEDURES
ITEM
MAXIMUM PERIOD BETWEEN
SUCCESSIVE CALIBRATIONS
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CALIBRATION PROCEDURE
REFERENCE STANDARD
ANNEX 1
GENERAL ADR TESTS
ACCELEROMETER
1. Reference
Five years, Check every two years
Calibrate against a known acceleration
over complete operating range
2. Working
Five years, Check annually
Calibrate against standard accelerometer
‘turn over’ check (± one ‘g’)
* Each use
AMMETERS
One year
BALANCE
Constant load,
Substitution weighing,
Three years
Mechanical loading
* Six months
By a calibration authority using
Standard Masses
For procedure refer to ASTM E319
in addition
* Three months
Full scale deflection and linearity
check.
Other types with mechanical
loading of all weights
* Two Years
Standard Masses
No inbuilt weights over 100 mg
* Three Years
Standard Masses
Electronic
One Year
By calibration authority
* One month
Full scale deflection and linearity
check using Standard Masses
Five Years (cleanliness of mercury,
vacuum space and scale error)
ASTM D3631;
* One Month (single point)
Comparison with standard
barometer in the same location;
alternatively Telephone comparison
with nearest meteorology bureau.
Five years
ASTM D3631;
* One Month (single point)
Comparison with standard
barometer in the same location;
alternatively Telephone comparison
with nearest meteorology bureau.
Three Years
ASTM D3631;
* One Month (single point)
Comparison with standard
barometer in the same location;
alternatively Telephone comparison
with nearest meteorology bureau.
BAROMETERS
Fortin, mercury in glass
Aneroid
Electronic
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ITEM
DIAL GAUGES
TEST PROCEDURES
MAXIMUM PERIOD BETWEEN
SUCCESSIVE CALIBRATIONS
* Two years or less depending on use
CALIBRATION PROCEDURE
REFERENCE STANDARD
Gauge Blocks Australian Standard 2103
- 1978
EXTENSOMETERS
1. Lever and Mirror
Five years
Australian Standard 1545 - 1976 Grade D
(for proof stress test and load-extension
curves for pre-stressing wires) or
equivalent.
2. Micrometer Screw
Five years
Australian Standard 1545 - 1976 Grade B
(for modulus of elasticity) or equivalent
3. Dial Indicator
Two years
4. Recording types with
electrical output
Two years
FORCE TESTING MACHINES
(tension, compression, universal)
Type 1
Mechanical Force Measuring
System
1. Dead Weight
Five years
2. Knife Edge Lever and
Steel yard
Five years
3. Pendulum Dynamometer
Two years
4. Elastic Dynamometer
(e.g. spring, ring
and dial gauge)
Two years
Australian Standard 2193 - 1978 “Methods
of Calibration and Grading of Force
Measuring Systems of Testing
Machines" or equivalent.
Type 2
Hydraulic or Pneumatic
Force Measuring System
1. Mechanical system
incorporating a pneumatic
or a hydraulic link
e.g. proportioning cylinder
Two years
2. Bourdon tube or diaphragm
Pressure gauge as force
indicator
Six months
3. Type 2 fitted also with a
master gauge which can be
disconnected during normal
testing
One year (plus frequent checks by user of
working gauge against Master gauge)
4. Bourdon tube or diaphragm
gauge used only as a null
detector for a mechanical
system
Two years
5. Bourdon tube with
electrical transducer
Two years
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Australian Standard 2193 - 1978 “Methods
of Calibration and Grading of Force
Measuring Systems of Testing
Machines" or equivalent.
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TEST PROCEDURES
ITEM
MAXIMUM PERIOD BETWEEN
SUCCESSIVE CALIBRATIONS
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CALIBRATION PROCEDURE
REFERENCE STANDARD
Type 3
Electrical Force
Measuring Systems
Two years
Ditto
GAUGE BLOCKS
Used as reference standards
Four years
Used as working equipment
Two years
Against standard
HARDNESS TESTERS FOR METALS
1. Brinell, Vickers, Rockwell
machines including portable
testers.
* Routine check each day tester in use
Inspection of indenter
One year (partial calibration)
Three years (complete calibration)
Time to apply force
Use of hardness blocks
2. Portable Brinell Microscopes
One year
Calibrated graticule
3. Diamond Indenters
One year
Inspection
Three years
Complete calibration
(Rockwell, Vickers)
HARDNESS TESTERS FOR RUBBER
PLASTIC AND EBONITE
1. Dead weight testers for
rubber
Three years
2. Dead weight testers for
plastics
3. Meters (durometers)
Three years
BS 903 Methods N A L M
* Frequent checks by user on reference
hardness blocks
Standard hardness block
LOAD CELLS
Strain Gauge Load Cell
* before each test
Against calibrated universal force
testing machine.
Piezo Electric Load Cell
* One year
Calibrate against known load input
One Year
AS 2080 - 1983, Illuminat ‘A’ of CIE
LUMINOUS TRANSMITTANCE
MASSES
1. Reference masses of integral
construction, stainless steel
or nickel-chromium alloy
Five years initial;
Ten years subsequent
2. Reference masses, screw
knob, stainless steel or
nickel-chromium alloy
Three years
3. Working masses, class B,
stainless steel or nickelchromium alloy or integral,
plated
* Three years
ASTM E617
4. Working masses, class B,
not stainless steel or
nickel-chromium alloy
* One year
ASTM E617
5. Working masses of accuracy
below Class B including
large masses used for proof
tests on lifting gear.
Five years
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ITEM
MICROMETERS (hand)
TEST PROCEDURES
MAXIMUM PERIOD BETWEEN
SUCCESSIVE CALIBRATIONS
CALIBRATION PROCEDURE
REFERENCE STANDARD
* Monthly or less dependent on use
Check zero and anvil condition
Five years
Complete calibration to Australian
Standard 2101 -1978 or 2102 - 1978
using Standard reference gauge blocks.
PHOTOMETERS
See Circular 0-12-5
PRESSURE AND VACUUM GAUGES
AND GAUGE TESTERS
Working gauges
* One year
Australian Standard 1349 - 1986
or BS 1780 (Part 2) .
Test gauges used for
calibration of working
gauges
Five years
Pressure Transducers
* Six monthly
Manometer
Ten years
BS 1780
Dead weight
Ten years
BS 1780
PROVING DEVICES FOR CALIBRATION
OF FORCE TESTING MACHINES
Type 1
Elastic Devices
1. Dial Gauge for deflection
measurement
Two years
2. Micrometer Screw for
deflection measurement
(mechanical or optical
indication)
Five years
3. Electrical Deflection
Measurement
Two years
Type 2 Proving Levers
Five years
Type 3 Masses
Ten years
RELATIVE HUMIDITY
Standard
1. Assman hygrometers
Ten Years (complete)
* Six monthly
CSIRO Division of Applied Physics
Technical Paper 3,4 & 5 or equivalent
2. Sling type hygrometers
* Six monthly
(compare thermometers at room
temperature with wick dry)
ASTM E104-51
Recorders accurate to
+ 1% RH
Two Years
ASTM E77
Working recorders
* Weekly
Against standard Hygrometer
* Each test
Use piston phone
Two years
full frequency and amplitude spectrum
as required by IEC 179 and IEC 651
One year
Output frequency and level
SOUND LEVEL METERS
Sound Level Meter
Piston phone
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TEST PROCEDURES
ITEM
STEAM GENERATOR
(ADR 15/00)
MAXIMUM PERIOD BETWEEN
SUCCESSIVE CALIBRATIONS
CIRCULAR 0-12-3
CALIBRATION PROCEDURE
REFERENCE STANDARD
* Yearly
See Circular 15/00-9-1
Demisting of Windscreen
Mechanical
* Three Months
Comparison against broadcast standard
time signals over ten minutes minimum
Quartz
* One year
Comparison against broadcast standard
time signals over ten minutes minimum
THERMOMETERS
Liquid in Glass
Reference
Ten Years (complete)
CSIRO Division of Applied Physics
Technical Paper 4 & 5, ASTM E77 or
equivalent
STOPWATCHES
* Six months (zero or ice point)
Working
AC Resistance Bridge
* Six months (one point)
Ten Years (complete)
Platinum Resistance
Ten Years (complete)
Thermocouples
Three Years
TACHOMETERS
Mechanical
Reference
Working
Quartz Oscillator
CSIRO Division of Applied Physics
Technical Paper 4 & 5 or equivalent
against reference thermometer
CSIRO Division of Applied Physics
Technical Paper 3
BS 1041
Five years
* One year
* in built check before each
measurement.
* on first commissioning or after
major maintenance
Strobe light against mains
frequency
* Three months
Check against surveyed road distance
* Each use
Check against surveyed road distance
* Three months
Check against surveyed road distance
* Each use
Check against surveyed road distance
(Using ‘gates’ and timer)
* Each use
Functional check
Distance
Five years if fixed; each use if set up
Calibrated tape
Timer
One year
Standard time signal
VEHICLE SPEED
By Fifth Wheel
Mechanical
Electronic
(by Doppler signal)
VEHICLE DISTANCE
By Fifth Wheel
Mechanical
Electronic
(by Doppler signal)
BS 3403
SAE(Australasia)-T5033
VELOCITY
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TEST PROCEDURES
VOLTMETERS
ITEM
MAXIMUM PERIOD BETWEEN
SUCCESSIVE CALIBRATIONS
CALIBRATION PROCEDURE
REFERENCE STANDARD
Mechanical
One year
Against voltage standard
Electronic
One year
Comparison with Standard meter
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TEST PROCEDURES
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ANNEX 2
VEHICLE EMISSION TESTS
Periodical Calibration of Reference Equipment for Vehicle Emission Testing Laboratories
CONTENTS
Constant Volume Sampler
Correlation Car
Density Measurement
Dynamometers
Dynamic Gas Blending Device
Fans
Flowmeters
Gas Analysers
Potentiometers
Reference Gases
SHED (Sealed Housing for Evaporative Determinations)
Accuracy of Instrumentation for CVS Calibration
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ITEM
TEST PROCEDURES
MAXIMUM PERIOD BETWEEN
SUCCESSIVE CALIBRATIONS
CALIBRATION PROCEDURE
REFERENCE STANDARD
ANNEX 2
VEHICLE EMISSION TESTS
CONSTANT VOLUME SAMPLER
Positive Displacement Pump
* 500 Hours of use after stabilising
period or major maintenance
ADR 37/00 - Appendices 5 and 12.
Critical Flow Venturi
* As indicated by CVS system
verification
Reference Standard; Air Flow Meter
(Laminar Flow Element, Subsonic
Venturi or Orifice plate) Calibration
traceable to National Standards.
Accuracy 1% of air flow.
System Verification
Propane
Carbon Monoxide
Carbon Dioxide
* Weekly or after maintenance or
servicing of system
Using CP Propane (C3H8),
Carbon Monoxide or Carbon Dioxide.
System accuracy in the order of 2%
Critical Flow Orifice or ‘bomb method’.
NOTE: Precautions for use of pure
carbon monoxide.
CORRELATION CAR
* As required to supplement other
system verification methods.
Approved in-house laboratory methods.
Initial
Australian Standard 2026 - 1977.
glass
* one year
IP160; ASTM E126,
metal
* six months
ISO R649.
Density Bottles
* two years
BS 733; ASTM D941.
DENSITY MEASUREMENT
Hydrometer
Reference
Working
DYNAMOMETERS
Chassis
Load scale
* Knife edge - Five years
* Pneumatic or Hydraulic
link - Two years
* Electronic - Two years
* Bourdon tube - Six months
Roller speed
* Three monthly
As part of power absorption
calibration or more frequently if
regular checks dictate.
Power absorption
* Monthly
ADR 37/00 Appendices 4 and 12.
Performance Check
* Weekly
Distance Measurement
* Six Monthly
Engine
Load scale
Speed r/min
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* Six monthly
* Three Monthly
Page 16 of 19
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TEST PROCEDURES
ITEM
MAXIMUM PERIOD BETWEEN
SUCCESSIVE CALIBRATIONS
CIRCULAR 0-12-3
CALIBRATION PROCEDURE
REFERENCE STANDARD
DYNAMIC GAS BLENDING DEVICE
Standard Gas Divider
* Yearly
Using gas analyser and primary gas
standards for each gas type.
* Each use
Single point
* On commissioning or major overhaul
Anemometer.
Laminar Flow Element (LFE)
100 hours of use or 5 years
whichever occurs first
Cleaning and Calibration with
calibration traceable to US National
Standard within 1%. Unit should be
sent to approved laboratory
Smooth Approach Orifice
Plate
Ten years
Cleaning and Calibration with
calibration traceable to US National
Standard within 1%. Unit should be
sent to approved laboratory
Venturi Flow Meter
Ten years
Cleaning and Calibration with
calibration traceable to US National
Standard within 1%. Unit should be
sent to approved laboratory
Anemometers
Two years
FANS
Engine Cooling
FLOWMETERS
Air Flow Meter
Rotameters (see Note)
reference
High flow more than
1 l/minute
* Two years
ASTM D3195
Low flow less than
* Two years
Soap bubble flow meter
1 l/minute
NOTE:- In vehicle emission testing (gas analyser and CVS) rotameters are used as indicators of flow rather than a flow
measuring device.
Fuel Flowmeters
* Six monthly
GAS ANALYSER
For motor vehicle exhaust
emissions
* span and zero check before and after
each analysis on each analyser
ADR 37/00 Appendices 10, 12 and 13
ADR 36/00,
* Monthly. Recalibration of all
analysers
Minimum of six points at nominal
15,30,45,60,75,90 percent of range.
(Not including zero)
Calibration on all instruments.
Using standard gases referenced
to NBS or SAA Standard for Traceable
Reference Gases (AS 2719-1984)
Dynamic gas blending devices
such as Standard Gas Divider
with an accuracy of within
1% may be used for calibration.
* Weekly
ADR 37/00 - Appendix 10.
NOx Converter
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ITEM
TEST PROCEDURES
MAXIMUM PERIOD BETWEEN
SUCCESSIVE CALIBRATIONS
CALIBRATION PROCEDURE
REFERENCE STANDARD
Flame Ionization Detector
HC Optimisation of
Performance
* On first commissioning yearly
and after major maintenance
HC oxygen quenching effect
ADR 37/00 - Appendix 10
SAE J1094a Constant Volume Sampler
System for Exhaust Emissions or
instrument manufacturers
recommendations.
CO Analyser
Interference
of CO2 and H2O
Exhaust Emissions of
Engines at Idle
NDIR CO, CO2 and HC
* On first commissioning, yearly and
after major maintenance
ADR 37/00 Appendix 10.
* Electrical check before each reading
Manufacturers instructions
* Weekly span and zero
Gas check to manufacturers
instructions
Multi point calibration check using
standard gases.
* Monthly
NOTE:- Non-linear instruments such as NDIR are not considered
to be ‘linear’ when fitted with linearising circuits.
POTENTIOMETERS
Reference
Five Years
Working
* One Year
BS 9130
REFERENCE GASES
Australian Standard 2719-1984 or
Primary standards with traceability to
NBS SRM preferably using SAA
or EPA protocol.
SHED
(Sealed housing for
evaporative determinations)
Background emissions
* Yearly
H.C. retention check
* Yearly
H.C. Analyser (F.I.D.)
* Monthly
Minimum of six point calibration (not
including zero)(see Gas Analysers).
Homogeneity test
* on commissioning or major service
To ensure a homogeneous hydrocarbon
concentration throughout SHED.
Response time
* on commissioning or major service
Time to achieve homogeneity.
Propane Recovery
* on commissioning or major service
Volume of SHED
* on commissioning or major service
CIRCULAR 0-12-3
ADR 37/00 Appendices 11 and 12.
Page 18 of 19
Issue 2:
TEST PROCEDURES
CIRCULAR 0-12-3
ACCURACY OF INSTRUMENTATION FOR CVS CALIBRATION
Calibration Data Measurement - for a Constant Volume Sampler (CVS) of:
(i) Positive Displacement Pump (PDP) Type; or
(ii) Critical Flow Venturi (CFV) Type
PARAMETER
SYMBOL
TOLERANCE
INSTRUMENT
Atmospheric pressure
PB
± 30 Pa
Barometer
Ambient Temperature
TA
± 0.3oC
Thermometer
Air Temp. into LFE
ETI
± 0.15oC
Thermometer
Pressure depression upstream of LFE
EPI
± 10 Pa
Manometer
Pressure differential across LFE
EDP
± 0.1 Pa
Manometer
PDP inlet; or
PTI
± 0.3oC
Thermometer
CFV inlet
TV
± 0.3oC
Thermometer
PDP inlet; or CFV inlet
PPI
±10 Pa
Manometer
Pressure at PDP outlet
PPO
±10 Pa
Manometer
Air temperature at PDP outlet (optional)
PTO
± 0.3oC
Thermometer
PDP revolutions during test phase
N
± one
Revolution counter
Elapsed time for test phase
t
± 0.1 seconds
Stopwatch or equivalent
Air Flow (litres/minute)
Qs
± 0.5 percent
Laminar flow element or
Air Temperature at:
Pressure depression at:
Sub-sonic Venturi flowmeter
Issue 2:
Page 19 of 19
CIRCULAR 0-12-3