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					                            CIRCULAR 15/01-9-1




                            TEST PROCEDURES
             ADR 15/01-DEMISTING OF WINDSCREEN

                          “A Guide for Inspectors”




                 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                        CIRCULAR 15/01-9-1


                                              CONTENTS


                                                                                    Page

1 SCOPE                                                                              5

2 SELECTION OF TEST COMPONENTS                                                       5

3 IDENTIFICATION OF TEST COMPONENTS                                                  5
     3.1 Related Components                                                          5

4 NUMBER OF TEST VEHICLES                                                            5

5 EQUIPMENT                                                                          5
    5.1 Engine Warm Up Characteristic Tests                                          5
    5.2 Critical Area Determination Tests                                            6
    5.3 Demist Test                                                                  6

6 PROCEDURE                                                                          7
    6.1 Engine Warm Up Characteristic Tests                                          7
    6.2 Critical Area Determination Tests                                            8
    6.3 Demist Tests                                                                 9
    6.4 Reporting Results                                                            10

7 ANALYSIS OF RESULTS                                                                10

8 SUMMARY OF EVIDENCE REPORT                                                         12

9 PROCEDURE FOR DESIGNS WITH CERTIFICATION
  TO ALTERNATIVE STANDARDS                                                           12

10 REFERENCES                                                                        12

ANNEX A
    TEST EQUIPMENT DATA
    Specifications and Schematic Diagram of a Typical Steam Generator Meeting
    ADR 15/00 Requirements                                                           13

ANNEX B
    SAMPLE DIAGRAMS
    (a) Sample Eye Ellipse Installation Diagrams                                      14
    (b) Sample Diagram of Vehicle Windscreen Showing Position of Critical Areas      15
    (c) Sample Steam Generator Calibration Curve                                      15




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  1 SCOPE                                                        3.1 Related Components
  This procedure, when read in conjunction with other
  Circulars issued by the Administrator, provides sufficient     The following components and assemblies are regarded
  information, without reference to other standards, for the     as those most likely to be related to demist system
  conducting and auditing of tests on Demisting of               performance. If it is obvious that some other components
  Windscreens to demonstrate Compliance with Australian          or assemblies would influence the result then these must
  Design Rule No. 15/00. For convenience the ADR Clause          also be considered.
  Number is quoted in brackets against each appropriate
  section of this procedure.                                            3.1.1 Engine. Identify engine family, net engine
  The equipment, orders of accuracy and step-by-step                    power, capacity, fuel system, manifold and
  actions described in this procedure are drawn from the                cooling fan.
  standards and recommended practices quoted in the ADR
  and from accepted laboratory and testing practices.                   3.1.2 Demist Sy stem. Identify heating
  While conformance with this procedure is sufficient to                components, air circulation components, outlet
  demonstrate compliance with the ADR, other equipment,                 ducts and associated tubing.
  orders of accuracy and procedures may be used provided
  it can be shown that they demonstrate compliance with                 3.1.3 Vehicle Cabin. Identify cabin spacial
  the ADR.                                                              characteristics to ensure tests are carried out on
  This ADR specifies minimum performance levels for                     model in the vehicle range with smallest occupant
  motor vehicle windscreen demisting devices during                     space available.
  operation under specified test conditions.
  This procedure is intended primarily as a guide for                   3.1.4 Glazing. Identify glazing components to
  Officers of the Australian Department of Transport and                enable area of glazing to be calculated and
  Communications or Agents acting on behalf of the                      relationship of Seating Reference Point to
  Administrator when they carry out audit inspections of                windscreen to be determined.
  Test Facilities or witness tests for compliance with the
  ADR. This and other Circulars dealing with Test                4 NUMBER OF TEST VEHICLES
  Procedures for ADRs may also be useful to vehicle              Generally at least one vehicle from each engine family,
  manufacturers and testing organisations.                       body style and demist system type would be required
  Nothing in these Circulars, however, absolves the              with additional test vehicles being necessary in line with
  manufacturers from complying with the requirements as          application of the specified criteria.
  specified in the ADR which always remains the primary
  reference.                                                     5 EQUIPMENT
                                                                 5.1 Engine Warm Up Characteristic Tests
  2 SELECTION OF TEST COMPONENTS                                       5.1.1 Basic Equipment
                                                                       5.1.1.1 Test Site. The test site to be in an area
  This procedure applies to vehicles which are of the
                                                                       protected from wind effects.
  type specified in the ADR. The complete vehicle is
                                                                       5.1.2 Instrumentation
  required to conduct the tests in accordance with the
                                                                       5.1.2.1 Measurement. Three items are required
  procedure. Refer to the relevant ADR implementation
                                                                       to be determined; engine speed; temperature and
  procedures circular for the selection of vehicles.
                                                                       time.
                                                                       The engine speed measurement is usually made
  3 IDENTIFICATION OF TEST COMPONENTS                                  by an electronic or mechanical tachometer fitted
                                                                       to the vehicle and provided with a visual readout
  The vehicles submitted for test shall be fitted with demist          and, in some instances, a graphical record of the
  system and related components that are representative of             engine speed obtained during the test.
  the design condition as reflected in the Production                  The demist duct air and ambient air temperatures
  Drawings.                                                            are typically measured by thermocouples and an
  If production parts are being tested they shall be drawn             appropriate indicator providing a visual and/or
  from a batch which has passed normal quality assurance               printed record of the air temperatures at the
  procedures. They should then be identified against                   specified locations.
  production drawings. If prototype parts are being tested             The elapsed time is typically measured by a stop
  they should be individually inspected on a component                 watch or by reference to the time base of a chart
  basis for both dimensional and material compliance with              recorder.
  the drawing. In both cases the revision or issue status of           5.1.2.2 Recording. The temperature of the
  the drawing to which the assemblies have been checked                demist duct air is required to be recorded during
  must be stated on all test records.

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       the test period either manually or by some form                 meeting these criteria specified in Clause 15.4,
       of chart recorder to provide a permanent record                 and a schematic diagram of the device are shown
       for report purposes.                                            in Annex A.
       5.1.2.3 Order of Accuracy. Except where                         If the test is to be conducted without starting the
       specified in the ADR or referred documents the                  vehicle’s engine (at the manufacturers discretion),
       following orders of accuracy are suggested as                   an electrical power supply may be used to provide
       being commercially achievable and should be                     power to the vehicle’s electrical system. The
       taken as a guide.                                               power supply should be capable of providing the
       Instrumentation of lesser accuracy is acceptable                voltage used to operate the demister fan at the
       provided this is taken into account in determining              lower limit of the regulated voltage of the vehicle
       the certainty of results.                                       as specified by the manufacturer.
       The engine speed reading should be within ±3%                   5.3.2 Instrumentation
       of the actual engine speed.                                     5.3.2.1 Measurement. Four items are required to
       The temperature measuring instruments should be                 be determined as control parameters for the test.
       accurate to within ±2 degrees Celsius over the                  These are elapsed time; test chamber air
       range of measurement.                                           temperature; air velocity and engine speed.
       The stop watch or timing device should be                       The elapsed time is typically measured by a stop
       accurate to within ±5 seconds over ten minutes.                 watch providing a visual display of the test
       5.1.2.4 Calibration. Routine calibration of the                 period.
       instrumentation and any associated recorders                    The test chamber air temperature is typically
       should be conducted in accordance with Circular                 measured by thermocouple and an appropriate
       0-12-3.                                                         indicator providing a visual and/or printed record
5.2 Critical Area Determination Tests                                  of the air temperature at the specified location.
                                                                       The air velocity adjacent to the demist air intake
       5.2.1 Basic Equipment. Drafting equipment
                                                                       is typically measured by an anemometer and a
       necessary to produce the required layout
                                                                       direct reading obtained.
       drawings.
                                                                       The vehicle engine speed measurement is usually
       A graphical representation of the 95th Percentile
                                                                       made by an electronic or mechanical tachometer
       Eye Ellipses as described in Circular 0-12-7.
                                                                       fitted to the vehicle and provided with a visual
5.3 Demist Test
                                                                       readout and, in some instances, a graphical record
       5.3.1 Basic Equipment. An environmental                         of the engine speed obtained during the test.
       chamber of sufficient size to accommodate the                   5.3.2.2 Recording. The test result required to be
       complete vehicle to be tested is required. The
                                                                       determined is the area of the windscreen demisted
       chamber shall be equipped with a means of                       at the conclusion of the test period. This data is
       achieving an ambient air temperature between                    typically recorded by direct marking of the
       minus 4.0 degrees and minus 1.0 degrees Celsius
                                                                       demisting o utline on the outside of the
       and of maintaining that temperature within                      windscreen by means of marking pen applied to
       300 mm of the vehicle demister air intake at this               the glass. Usually two observers operate together,
       level throughout the test. (Clause 15.5.1).
                                                                       one from either side of the vehicle to ensure that
       A means of removing vehicle exhaust gas from                    the area is quickly and accurately determined.
       the chamber should be provided.                                 The demisted outline is then transferred to a
       A steam generator similar to or meeting the
                                                                       drawing containing the specified Critical Areas to
       performance requirements of that specified in                   determine the test result.
       SAE Recommended Practice J953-Passenger Car                     The various control data can be manually
       Backlight Defogging System, May 1966,
                                                                       recorded from visual readings or suitable
       provided that the following criteria are met:-                  recording devices are sometimes used to provide
       - the capacity shall be at least 2 litres                       a permanent record for report purposes.
       - the heat loss at boiling point shall be less than
                                                                       5.3.2.3 Order of Accuracy. The following orders
       75 W in an ambient temperature of -1.0 degrees                  of accuracy for elapsed time, air temperature, air
       Celsius.                                                        velocity and engine speed are recommended.
       - the fan shall have a capacity of 0.05 - 0.1
                                                                       The engine speed reading should be within ±3%
       m3/min at 5 mm of water static pressure
                                                                       of the actual speed of the engine.
       - six steam outlet holes of 6 mm diameter shall be
                                                                       The stop watch or timing device should be
       provided around the top of the generator
       - the generator shall be calibrated in ambient                  accurate to within ±5 seconds over ten minutes.
       conditions of minus 4.0 degrees and minus                       The temperature measuring instruments for
       1.0 degrees C to give readings for each 65 g per                demist inlet air should be accurate to within ±0.5
       hour output from 65 g to 390 g per hour                         δεγρεεσ C elsiu s over the range -5.0 to
       The specifications of a typical steam generator                 +5.0 degrees Celsius. Other temperature

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                                                   TEST PROCEDURES                              CIRCULAR 15/01-9-1



           measuring instruments should be accurate to
                                                                   6 PROCEDURE
           within ±2 degrees Celsius over the range of
           measurement.                                            6.1 Engine Warm Up Characteristic Tests
           5.3.2.4 Calibration                                           6.1.1 Preparation for Test
           5.3.2.4.1 Steam Generator. The steam generator                6.1.1.1 Site Preparation. The test site shall be in
           shall be calibrated at regular intervals to provide           an area free from wind effects and should not be
           an operating characteristic for use in determining            in direct sunlight. The vehicles to be tested
           the electrical setting for the required steam output          should be parked in the same general location so
           during the test procedure. The calibration tests              that they will reach the same temperature and far
           are required to be carried out in an ambient                  enough apart so that they may be tested
           temperature between minus 4.0 and minus 1.0                   successively without affecting temperatures of the
           degrees Celsius and are required to provide output            other vehicle/s.
           readings for each 65 g per hour output from 65 g              6.1.1.2 Vehicle Preparation.            As far as
           to 390 g per hour. (Clause 15.4.1.5).                         practicable select or adjust vehicles to provide
           Th e fo llow in g calib ratio n p ro cedu re is               equal demist air flow rates. Check demist system
           suggested:-                                                   controls for correct function.
           Fill steam generator with water and bring to boil.            Select or set vehicle charging system regulators to
           Ensure that the steam valve is in the open position           within their specification.
           throughout the calibration procedure.                         Select or set engine coolant thermostats to within
           Place the assembly in cold chamber at -4.0 to                 specification in regard to opening characteristics.
           -1.0 degrees C and allow to it stabilise. Set the             Ensure that engine is tuned to Manufacturer’s
           power input to approximately 20% of the                       Specifications.
           maximum power input of the device and allow the               Install temperature measuring devices to
           steam output to stabilise.                                    determine air temperature at the same position of
           Weig h th e steam g ener ato r assembly,                      each demist duct and ambient air.
           disconnecting the feed wires. Reconnect within                Allow vehicles to stand in test area until
           two minutes. The steam generator may be                       temperatures stabilise.
           removed from the chamber for weighing provided                6.1.2 Tests
           it is replaced within two minutes.                            6.1.2.1 Connect engine speed measuring device
           After a measured period of time, reweigh the                  and temperature readout or recorder to one
           steam generator in the same manner as before.                 vehicle.
           Calculate the steam generated in g/h. The period              Close engine hood.
           of time used will determine the accuracy of the               Record ambient air temperature and demist duct
           calibration and should be sufficient to ensure that           air temperatures.
           the result of the calibration procedure, the power            Set demister controls to maximum heat and
           loss value, is clearly demonstrated to be less than           output conditions.
           the required value.                                           6.1.2.2 Using the Manufacturer’s recommended
           Refill the steam generator with water, set the                cold starting procedure, start engine and demister.
           power input to a further increment of the                     As soon as practicable reduce engine speed to
           maximum value such that a minimum of six                      1500 r/min maximum. For vehicles equipped
           calibration points approximately equally                      with an automatic choke the throttle should be
           separated over the specified output range will be             operated briefly after thirty seconds and each
           tested, replace in the cold chamber and allow to              sixty seconds thereafter until speed is below
           stabilise.                                                    1500 r/min. The throttle may then be used to
           Draw a graph showing steam generation in g/h                  maintain an engine speed of 1500 r/min
           over the range of input power required. The heat              maximum.
           loss value is found by extrapolation of the line of           6.1.2.3 Record temperature of air in demist ducts
           best of these points to the point of zero steam               at the designated position after one minute and
           output.                                                       then at one minute intervals for ten minutes.
           A typical calibration curve is included in Annex              6.1.2.4 Repeat Sections 6.1.2.1; 6.1.2.2 and
           B(c).                                                         6.1.2.3 for each vehicle in the test program.
           5.3.2.4.2 Other Instrumentation. Routine                      6.1.3 Determination of Results. Prepare a table
           calibration of the vehicle engine speed measuring             showing demist duct outlet air temperature during
           equipment, temperature measuring equipment,                   the test period for each vehicle in the test
           wind velocity measuring equipment, stop watch                 program.
           and any associated records should be conducted                The vehicle which gives the lowest demist duct
           in accordance with Circular 0-12-3.                           outlet air temperature throughout the test period
                                                                         can be assumed to provide the least effective

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       demister performance.                                         inclined upwards at 10 degrees to the horizontal.
       Due to small differences in ambient temperatures,             (Clause 15.1.5.1).
       variations in cold starting characteristics and               6.2.2.1.2 Other Vehicles. Construct a drawing or
       transient conditions associated with coolant                  series of drawings, complete with dimensions, to
       thermostats opening, it will be found that graph              provide a plane development view of the
       lines sometimes intersect, so that no one vehicle             windscreen daylight opening illustrating the
       can be identified as having the lowest demist duct            Critical Area A defined as follows:-
       air temperatures throughout the test period. The              Critical Area A is the area of the windscreen
       following criteria should be applied in these                 bounded by a plane tangential to the bottom of
       instances:-                                                   the eye ellipse which includes a line at ground
       Where temperature lines are separated by less                 level transverse to the longitudinal axis of the
       than 2.0 degrees C they should be considered to               vehicle 11m forward of the rearmost eye ellipse
       be coincident.                                                point, and two diverging vertical planes tangential
       Where temperature lines intersect or separate in              to and inclined 18 degrees to the outboard and
       the final two minutes of the test period and the              56 degrees to the inboard eye ellipses respectively
       maximum separation is less than 4.0 degrees C                 and a plane tangential to the top of the eye ellipse
       they should be considered to be coincident.                   inclined upwards at 5 degrees or arctan (3-H)/11
       Where a vehicle provides demist duct outlet air               (where H is the height in metres of the top of the
       temperatures which are either lowest, or equal to             eye ellipse above ground level) whichever is the
       the lowest, throughout the test period after                  greater. (Clause 15.1.5.2).
       application of the above criteria, then the vehicle           Note: If any part of the vehicle structure falls
       may be considered to be the one giving the least              within the area of the Windscreen as described in
       effective demister performance for the model                  Section 6.2.2.1.2 above the area of the windscreen
       range concerned.                                              shall in that case mean the area of the Windscreen
6.2 Critical Area Determination Tests                                Glass available to the driver for external view.
       6.2.1 Preparation for Test                                    6.2.2.2 Critical Area B. Construct a drawing or
       6.2.1.1 Location of 95th Percentile Eye Ellipse.              series of drawings, complete with dimensions, to
       Determine the length or lengths of the normal                 provide a plane development view of the
       driving and riding seat track travel available and            windscreen daylight opening illustrating the
       any other options on the seating package on the               Critical Area B defined as follows:-
       vehicle being tested. Locate the 95th percentile              Critical Area B is that part of Critical Area A
       eye ellipse in the vehicle interior as described in           within diverging vertical planes inclined
       Circular 0-12-7. Annex B contains a schematic                 15 degrees left and right and tangential to the
       diagram illustrating the 95th percentile eye ellipse          inboard and outboard eye ellipses respectively.
       template positioned in this manner.                           (Clause 15.1.6).
       6.2.1.2 Measurement             Definitions.     All          6.2.3 Determination of Results. The critical
       measurements relating to the vehicle and the                  areas resulting from the above drawing
       surface on which it stands shall be considered                development are those to be used for determining
       relative to the vehicle’s design attitude at design           the demisted areas upon completion of the test.
       load on level ground. (Clause 15.1.4).                        The determined Critical Area drawings are to be
       All eye ellipses are for the 95th percentile.                 used to enable the boundaries of the Critical
       6.2.2 Tests                                                   Areas A and B to be marked on the outside of the
       6.2.2.1 Critical Area A                                       windscreen of the test vehicle.
       6.2.2.1.1 Vehicles of Categories MA and MC                    This may be carried out prior to the demisting test
       Construct a drawing or series of drawings,                    being conducted or alternatively after the demist
       complete with dimensions, to provide a plane                  test has been completed if there remains any
       development view of the windscreen daylight                   misted areas from which the percentage of the
       opening illustrating the Critical Area A defined as           Critical Areas demisted during the test can be
       follows:-                                                     determined.
       Critical Area A is the area of the windscreen           6.3 Demist Tests
       bounded by a plane tangential to the bottom of                6.3.1 Preparation for Test
       the eye ellipse which includes a line at ground               6.3.1.1 Vehicle Preparation. It is recommended
       level transverse to the longitudinal axis of the              that vehicle engines used for demisting tests
       vehicle 11 m forward of the rearmost eye ellipse              should have completed a minimum of 1000 km
       point, and two diverging vertical planes tangential           road use or equivalent prior to the test being
       to and inclined 18 degrees to the outboard and                conducted.
       56 degrees to the inboard eye ellipses respectively           Check demist controls for correct function.
       and a plane tangential to the top of the eye ellipse          Select or set the vehicle charging system

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           regulators to within their specification.                   for each seating position in the vehicle to be
           Select or set engine coolant thermostats to within          tested except for light omnibus, Category MD2
           specification in regard to opening characteristics.         vehicles, where only the number of front seating
           Ensure that engine is tuned to Manufacturer’s               positions, including the driver’s shall be used.
           Specifications.                                             This stabilisation may be performed inside the
           Install temperature measuring devices to                    vehicle provided that any steam generated before
           determine the air temperature at a point within             the start of the test is piped away from the vehicle
           300 mm of the vehicle demister air intake. The              and the pretest period is not more than twenty
           point selected should be such that there is no              minutes. (Clause 15.5.4).
           effect from engine heat during the test. (Clause            6.3.2 Tests. Position the steam generator outlets
           15.5.1).                                                    immediately behind the centre of the front seat on
           Install temperature measuring devices to engine             the vehicle longitudinal centre line with the
           coolant, engine lubricant and vehicle interior in           outlets at the approximate height of occupant
           order to satisfy temperature stabilisation                  breath level provided that the height shall be at
           requirements. (Clause 15.3.4).                              least 75 mm above the top of the seat squab
           Provide a suitable anti-freeze coolant to prevent           disregarding the height of any head restraints
           system malfunction due to freezing of the coolant.          fitted. Where the head restraint is integral with
           Install engine speed measuring and/or recording             the squab structure the steam generator outlet
           equipment if the engine is to be used.                      should be positioned such that the seat squabs do
           Mark the lines representing the boundaries of the           not unduly block the passage of steam to the front
           critical areas of the windscreen on the outside of          compartment. In the case of a vehicle having no
           the windscreen. (Clause 15.3.3).                            rear seating positions the steam generator shall be
           Alternatively the lines representing the critical           placed on the vehicle longitudinal centreline, on
           area boundaries on the windscreen may be                    the seat, or between the bucket seats, as
           marked upon completion of the test.                         applicable, with the outlets at the approximate
           Thoroughly clean the inside surface of the                  height of occupant breath level. (Clause 15.6.1).
           windscreen using a mixture of whiting and                   6.3.2.1 Two steam generators may be used to
           alcohol. Allow mixture to dry and wipe off                  provide the required steam output. In this case,
           surface using a dry cotton cloth. (Clause 15.3.2).          the first generator shall be located as above and
           No person should be permitted to smoke inside               the second on the same level and midway
           the vehicle after this operation and prior to the           between the first generator and the point on the
           demisting test.                                             vehicle immediately behind the rearmost seat.
           Position vehicle in environmental chamber and               Commence operation of any temperature
           connect instrumentation recording equipment as              recording devices or record temperature at the
           necessary.                                                  various monitoring points. Repeat measurement
           Stabilise temperatures in the environmental                 of temperature at these points at least every two
           chamber for sufficient time to ensure that engine           minutes throughout the test period.
           coolant, lubricant and internal air temperatures            Record wind velocity within 300 mm of the
           are stabilised at a temperature not exceeding               vehicle demist air intake. Repeat this
           -1.0 degrees Celsius. (Clause 15.3.4).                      measurement at least once while the engine is in
           If the engine is not used for the test connect the          operation.
           electrical supply to operate the demister (Clause           Set the demisting controls to provide maximum
           15.6.0)                                                     demister performance in accordance with the
           6.3.1.2 Test Conditions. The test chamber air               manufacturers instructions as contained in the
           temperature, measured within 300 mm of the                  owner’s handbook.
           vehicle demist air intake, shall be between minus           Commence operation of the steam generator
           4.0 and minus -1.0 degrees Celsius (Clause                  within the vehicle coincident with operation of
           15.5.1).                                                    the timing device.
           The air velocity within 300 mm of the vehicle               After the steam generator has been operating
           demister air intake shall be less than 2.5 m/s              within the vehicle for a period of at least five
           (Clause 15.5.2).                                            minutes, either one or two observers shall enter
           The vehicle engine hood, doors, windows and                 the vehicle. The output of the generator shall be
           adjustable vents (except the demister air intake)           reduced by 65 g per hour for each observer
           shall be closed except that one window may be               present. (Clause 15.6.2).
           opened 26 mm (Clause 15.5.3).                               After one minute + 10 seconds - 0 seconds from
           The steam generator containing at least 1.5 litres          the time of entry the demisting process shall be
           of water shall be brought to boiling point and              commenced. (Clause 15.6.3).
           stabilised to generate not less than 65 g per hour          Should water run-off from the inside surface of


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     the windscreen commence either during the five                  above the horizontal and tangential to the top
     minute mist build-up time or the one minute                     surface of the 95th percentile eye ellipse. (Clause
     observer preparation time the demisting process                 15.2.2.2).
     should be commenced immediately and the                         After a maximum time of ten minutes from the
     change in procedure noted in the test records.                  start of the demisting performance test any
     (Clause 15.6.4).                                                remaining misted area between the upper and
     If the engine is to be used to assist the demisting             lower planes bounding Critical Area A which
     performance it should be started coincident with                borders the right hand pillar shall be totally within
     the commencement of the demisting period using                  26 mm of the pillar (Clause 15.2.2.3).
     the manufacturer’s recommended cold starting            6.4 Reporting Results
     procedure as contained in the owner’s handbook.         For each test series a complete internal report giving a
     The engine speed should not exceed 1500 r/min           full description of materials tested, test method and
     throughout the demisting period, except that if         results is to be prepared. The report should contain a
     this requirement cannot be met, the engine shall        drawing of the demisted areas obtained at the conclusion
     be operated at the lowest practicable level and         of the ten minute demisting period.
     reduced to below 1500 r/min as soon as possible         For submission to the Administrator the determined
     during the test period. (Clause 15.6.5).                results and percentage of the Critical Areas demisted are
     For vehicles equipped with automatic choke and          to be included together with the internal report number in
     dependent on throttle movement for release, the         the appropriate section of the Summary of Evidence
     th ro ttle should be operated briefly after             Report - See Section 8.
     30 seconds and each 60 seconds thereafter until
     the engine speed is below 1500 r/min. The               7 ANALYSIS OF RESULTS
     throttle may then be used to maintain the engine        The vehicle will be considered to have conformed with
     speed so that the maximum speed of 1500 r/min           the requirements of ADR 15/00 if the following results
     is not exceeded. Any deviation from the engine          have been achieved after making the appropriate
     speed requirements and the reason for it must be        allowance for instrument uncertainty where applicable.
     recorded on the test records.                           CLAUSE                  RESULT
     In the event of prolonged delay in starting the
                                                             15.2.1.1 All applicable vehicles were fitted with a
     engine, or prolonged or numerous stalls, the test
                                                                        device capable of removing condensed
     may be repeated after re-stabilisation.
                                                                        moisture from, and preventing the formation
     After operation of the vehicle in this manner for a
                                                                        of condensed moisture on, the inside of the
     period of ten minutes maximum from start of the
                                                                        windscreen to enable the driver to obtain a full
     demisting process record the demist pattern
                                                                        and uninterrupted view ahead.
     existing on the windscreen. (Clause 15.6.6).
                                                             15.2.2      Specific Requirements for MA, MB, MC,
     The demist pattern may also be recorded at other
                                                                        MD1, MD2, and N Group vehicles shall be
     times during the ten minute demisting operation if
                                                             15.2.2.1 At least 95% of Critical Area B was demisted
     required by the Manufacturer or Test Facility.
                                                                        after a maximum operating time of ten
     6.3.3 Determination of Results. A t t he
                                                                        minutes in the demisting test.
     completion of the test a scale drawing of the
                                                             15.2.2.2 At least 90% of Critical Area A was demisted
     windscreen daylight opening showing the Critical
                                                                        after a maximum operating time of ten
     Areas and demist patterns shall be prepared and
                                                                        minutes in the demisting test.
     the percentage of the Critical Areas demisted shall
                                                                        Any remaining misted area within Critical
     be calculated. (Clause 15.6.7).
                                                                        Area A which bordered the upper boundary of
     Note:- Alternatively if at the end of the 10 minute
                                                                        Critical Area A did not encroach below a
     test period the whole of the windscreen has been
                                                                        plane inclined at 5 degrees above the
     cleared it will not be be necessary to prepare
                                                                        horizontal and tangential to the top surface of
     drawings of the critical area and demist patterns.
                                                                        the 95th percentile eye ellipse.
     Specific requirements for MA, MB, MC, MD1,
                                                             15.2.2.3 After a maximum operating time of ten
     MD2, and N Group vehicles are.
                                                                        minutes in the demisting test any remaining
     After a maximum of ten minutes from the start of
                                                                        misted area between the upper and lower
     the demisting performance test 95% of Critical
                                                                        planes bounding Critical Area A which
     Area B shall be demisted. (Clause 15.2.2.1).
                                                                        bordered the right hand pillar was totally
     After a maximum of ten minutes from the start of
                                                                        within 26 mm of that pillar.
     the demisting performance test 90% of Critical
                                                             15.3.1      All necessary vehicle preparation such as
     Area A shall be demisted. Any remaining misted
                                                                        cleaning and marking of the windscreen and
     area within Critical Area A which borders the
                                                                        instrumentation necessary for the test was
     upper boundary of Critical Area A shall not
                                                                        carried out prior to the vehicle temperature
     encroach below a plane inclined at 5 degrees
                                                                        stabilisation period.

 CIRCULAR 15/01-9-1                                   Page 10 of 15                                                 Issue 2:
                                               TEST PROCEDURES                                CIRCULAR 15/01-9-1



  15.3.2    The inside surface of the windscreen of the                   outlets at the approximate height of the
           test vehicle was thoroughly cleaned with a                     occupant breath level. The outlets were at least
           mixture of whiting and alcohol, allowed to dry                 75 mm above the top of the seat squab.
           and wiped off with a dry cotton cloth.                         Where the test vehicle was not provided with
  15.3.3    The external surface of the test vehicle                      any rear seating positions the steam generator
           windscreen was suitably marked to indicate                     was located on the vehicle longitudinal centre
           the boundaries of the Critical Areas.                          line, on the seat, or between the bucket seats,
  15.3.4    The test vehicle was permitted to stand in a                  as applicable, with the outlets at the
           cold chamber for sufficient time to ensure that                approximate height of the occupant breath
           engine coolant, lubricants and internal                        level.
           occupant space air temperatures were                15.6.2
           established at a temperature between minus          15.6.4     The steam generator was operated for at least
           4.0 and minus 1.0 degrees C.                                   five minutes inside the car before one or two
  15.4      The steam generator used for providing the                    observers entered the vehicle unless water run
           mist in the test vehicle:-                                     off commenced from the inside surface of the
           - was similar to that specified in Society of                  windscreen during the period.
           Automotive Engineers Recommended Practice                      Following entry by the observer/s the steam
           J953 - Passenger Car Backlight Defogging                       generator output was reduced by 65 g per hour
           System, May 1966.                                              for each observer.
           - had a water volume capacity of at least 2         15.6.3
           litres.                                             15.6.4      The demisting test was commenced at least
           - produced heat losses less than 75W at                        one minute after the observers entered the
           boiling point in an ambient air temperature of                 vehicle unless water run off commenced from
           minus 4.0 to minus 1.0 degrees C.                              the inside surface of the windscreen during
           - was fitted with a circulating fan with a flow                this period.
           rate capability between 0.05 and 0.1 m3/min at                 When the test is conducted with the engine in
           5 mm of water static pressure.                                 operation.
           - was provided with six steam outlet holes of       15.6.5      The engine speed on the test vehicle did not
           6 mm diameter around the top of the                            exceed 1500 r/min in neutral throughout the
           generator.                                                     demisting test period.
           - was calibrated in an ambient temperature                                   OR
           between minus 4.0 and minus -1.0 degrees C                     Where the engine of the test vehicle would not
           to give readings for each 65 g per hour output                 operate without exceeding 1500 r/min the
           from 65 g to 390 g per hour.                                   engine was operated at the lowest practicable
  15.5.1    The test chamber temperature, measured at a                   level.
           point within 300 mm of the vehicle demister         15.6.6      The demist pattern on the windscreen was
           air intake was between -4.0 and -1.0 degrees                   recorded after a period not exceeding ten
           C during the test period.                                      minutes from the start of the demisting test.
  15.5.2    The air velocity within 300 mm of the vehicle      15.6.7      Unless the whole of the windscreen has been
           demister air intake did not exceed 2.5 m/s                     demisted in the 10 minute test period prepare a
           during the test period.                                        scale drawing of the demist pattern on the
  15.5.3    The test vehicle engine hood, doors,                          windscreen was prepared and the percentage
           adjustable vents and windows were closed                       of the Critical Areas demisted calculated.
           during the test period except that one window
                                                               8 SUMMARY OF EVIDENCE REPORT
           could be open up to 26 mm.
  15.5.4    The steam generator contained at least             The Summary of Evidence Report (SER) is the only
           1.5 litres of water at the commencement of          d ocu ment to be sent to the Administrator for
           the steam generator stabilisation period. The       demonstration of compliance to ADR 15/00. The
           steam generator was stabililised at an output of    original test report identification number, the location of
           a least 65 g per hour for each seating position     the test report, the test facility identification number and
           provided in the test vehicle.                       the determined results are to be recorded in the
           If the steam generator was stabilised in the        appropriate place in the SE 15/00 form for each clause of
           vehicle the steam was piped away from the           the ADR.
           vehicle and the stabilisation period was not
           more than twenty minutes.                           9 PROCEDURE FOR DESIGNS WITH
  15.6.1    The steam generator was located immediately        CERTIFICATION TO ALTERNATIVE
           behind the centre of the front seat on the          STANDARDS
           vehicle longitudinal centre line with the           There are no equivalent Alternative Standards for ADR

Issue 2:                                            Page 11 of 15                               CIRCULAR 15/01-9-1
CIRCULAR 15/01-9-1                      TEST PROCEDURES



15/00.                                                 J941e (Mar 77) - Motor Vehicle Driver’s Eye Range
                                                       J941 (Mar 81) - Motor Vehicle Driver’s Eye Range.
10 REFERENCES                                          ISO 4513 1978 (E) - Road Vehicles - Visibility - Method
ADR References                                         for Establishment of Eye Ellipses for driver’s Eye
ADR Definitions                                        Location.
ADR 15/00 - Demisting of Windscreens                   Circulars
Society of Automotive Engineers Recommended            Circular 0-12-3 - General Requirements for Calibration
Practices:-                                            of Test Equipment and Instrumentation
J953 (May 66) - Passenger Car Backlight Defogging      Circular 0-12-7 - Motor Vehicle Drivers Eye Range (95th
Systems.                                               Percentile Eye Ellipse)
J941b (Feb 69) - Motor Vehicle Driver’s Eye Range      Other References
J941c (June 72) - Motor Vehicle Driver’s Eye Range     Recommended Practices:- SAE-A-T5001b (Feb 74) -
J941d (Feb 75) - Motor Vehicle Driver’s Eye Range.     Demisting of Windscreens.




  CIRCULAR 15/01-9-1                            Page 12 of 15                                           Issue 2:
                                                 TEST PROCEDURES                               CIRCULAR 15/01-9-1



                                                      ANNEX          A

  TEST EQUIPMENT DATA

                SPECIFICATION & SCHEMATIC DIAGRAM OF A TYPICAL STEAM GENERATOR
                                   MEETING ADR 15 REQUIREMENTS

  1. The steam generator consists of an insulated liquid container in which is installed a submerged typed heating element.
  A steam distributor assembly which also contains a two-way valve is mounted directly on top of the container. The
  valve can be adjusted to enable the steam to be distributed inside the vehicle or expelled outside the vehicle through a
  transfer duct. The power supply consists of an auto transformer for controlling the input voltage to the heating element
  and a meter is used to measure the input power to the heating element.

  1.1 WATER CONTAINER
       Minimum Capacity - 2 litres
       Heat loss must be less than 75W at water boiling temperature and ambient temperature between minus 4.0 and
       minus 1.0 degrees C.
  1.2 HEATING ELEMENT
       Capacity - 500W
  1.3 NOZZLE
       Material -Brass
       Inside diameter - 16 mm, length - 102 mm.
  1.4 STEAM DISTRIBUTOR ASSEMBLY
       Material -Brass
       Insider diameter - 76 mm, length - 155 mm
       Holes - six 6.3 diameter evenly spaced 25
       mm above bottom of container
  1.5 OUTLET - EXHAUST
       Material - Brass
       Inside diameter - 19 mm, length - 51 mm
  1.6 FAN ASSEMBLY
       Capacity 0.9 - 1.6 litre/s at 5 mm of water
       static pressure
  1.7 WATTMETER
       Capacity - 500W minimum
       Accuracy - Conforming to Australian
       Standard C42.1964 Electrical Indicating
       Instruments, Class 1.0




            (a) SPECIFICATIONS & SCHEMATIC DIAGRAM OF A TYPICAL STEAM GENERATOR
                                MEETING ADR 15/00 REQUIREMENTS


Issue 2:                                             Page 13 of 15                                CIRCULAR 15/01-9-1
CIRCULAR 15/01-9-1                 TEST PROCEDURES



                                       ANNEX      B
TEST EQUIPMENT DATA




                                                          MANIKIN SR POINT WITH SEAT IN
                                                         REARMOST NORMAL DRIVING AND
                                                         RIDING POSITION




  PLA N VIEW EYE ELLIPSE
  LOCATION FOR BENCH SEATS




                      (a) SAMPLE EYE ELLIPSE INSTALLATION DIAGRAMS

 CIRCULAR 15/01-9-1                      Page 14 of 15                                Issue 2:
                                 TEST PROCEDURES                      CIRCULAR 15/01-9-1



                                     ANNEX B
  TEST EQUIPMENT DATA




                                                             AREA A
                                                    AREA B




                        (b) SAMPLE DIAGRAM OF VEHICLE WINDSCREEN
                            SHOWING POSITION OF CRITICAL AREAS




                   (c) SAMPLE STEAM GENERATOR CALIBRATION CURVE



Issue 2:                            Page 15 of 15                      CIRCULAR 15/01-9-1

				
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