S.I. No. 67/1973 - European Communities (Measuring Instruments) Regulations, 1973.

I, JUSTIN KEATING, Minister for Industry and Commerce, in exercise of the powers conferred, on me by section 3 of the European Communities Act, 1972 (No. 27 of 1972), hereby make the following Regulations:

1 Citation

1. These Regulations may be cited as the European Communities (Measuring Instruments) Regulations, 1973.

2 Application

2. These Regulations apply to the following instruments:

( a ) medium accuracy weights of the following nominal values:

(i) rectangular bar weights of 5, 10, 20 and 50 kg:

(ii) cylindrical weights of 1, 2, 5, 10, 20, 50, 100, 200, 500g and 1, 2, 5 and 10 kg;

( b ) liquid meters, being volumetric meters for liquids other than water in which the liquid causes the movement of mobile walls of measuring chambers and which permit the measurement of any volumes;

( c ) gas volume meters of the following types:

(i) volumetric meters:

—meters with deformable walls,

—meters with rotary pistons:

(ii) non-volumetric meters:

—turbine meters.

3 Construction

3. The Sale of Gas Act, 1859, as amended, the Gas Regulation Act, 1920 , and the Gas Regulation Act, 1928 (in these Regulations referred to as the Gas Acts) and these Regulations shall be construed as one so far as the Regulations relate to gas volume meters and the Weights and Measures Acts, 1878 to 1961, and these Regulations shall be construed as one so far as the Regulations relate to other instruments.

4 Inspectors

4. For the purposes of these Regulations—

( a ) every inspector (including a special inspector) under the Gas Acts shall be an inspector so far as the Regulations relate to gas volume meters, and

( b ) every inspector (including an ex-officio inspector) under the Weights and Measures Acts, 1878 to 1961, shall be an inspector so far as these Regulations relate to other instruments.

5 Initial Verification Marks and Pattern Approval Symbols

5. (1) The EEC initial verification marks referred to in these Regulations are those described in and conforming with Schedule 1, which have been inscribed by the competent authority of a member State.

(2) The EEC pattern approval symbols referred to in these Regulations are those described in and conforming with Schedule 2.

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6. (1) Any medium accuracy weight may be used for trade if it bears the final EEC verification mark and the mark has not been cancelled by an inspector under these Regulations.

(2) Any liquid meter or gas volume meter may be used for trade if it bears the EEC pattern approval symbol and the final EEC verification mark and the mark has not been cancelled by an inspector under these Regulations.

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7. (1) Where any instrument is submitted to an inspector for EEC initial verification he shall examine the instrument in accordance with Schedule 3 and the special provisions applicable to an instrument of its category under these Regulations.

(2) If the inspector is satisfied after examination that the instrument meets the requirements prescribed he shall affix on the instrument the appropriate EEC initial verification mark.

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8. The medium accuracy weights which may receive the EEC initial verification marks are described in Schedule 4. They are exempt from EEC pattern approval.

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9. The liquid meters which may receive the EEC initial verification marks are described in Schedule 5. Only meters of a pattern that has received EEC pattern approval may be admitted to EEC initial verification and these meters shall be accepted as satisfying the construction requirements in Schedule 5.

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10. The gas volume meters which may receive the EEC initial verification marks are described in Schedule 6. Only meters of a pattern that has received EEC pattern approval may be admitted to EEC initial verification and these meters shall be accepted as satisfying the construction requirements in Schedule 6.

11 Inspection of Instruments in Service

11. (1) When an inspector inspects instruments in service which bear the EEC marks of initial verification he shall apply the tests and the required level of tolerances where they are prescribed in the Weights and Measures (General) Regulations, 1928 (S.R. & O., No. 71 of 1928), provided that the maximum errors permitted for these instruments on inspection shall bear the same ratio between inspection and initial verification as the ratio for other instruments not covered by the present Regulations.

(2) If the instrument does not satisfy the tests and level of tolerances applicable under this Regulation the inspector shall cancel the EEC initial verification mark.

12 Offences

12. (1) Any person who forges or counterfeits any stamp used for stamping under these Regulations or wilfully makes an alteration in an instrument so as to affect its accuracy shall on summary conviction be liable to a fine not exceeding œ200 or, at the discretion of the court, to imprisonment for a term not exceeding 6 months or both.

(2) Any person who knowingly uses, sells, utters, disposes of or exposes for sale any instrument with such forged or counterfeit stamp or an instrument so altered or an instrument bearing marks or inscriptions liable to be confused with EEC marks or symbols shall on, summary conviction be liable to a fine not exceeding œ100.

13 Prosecution of Offences

13. An offence under these Regulations may be prosecuted by the Minister for Industry and Commerce or an inspector.

SCHEDULE 1.

EEC INITIAL VERIFICATION MARKS(¹).

(¹)Council Directive No. 71/316/EEC, Annex II, 3.1.1., 3.3, amended by Act of Accession, 22 January, 1972, Annex I.X (Technical Barriers), 12.

1. Description of EEC initial verification marks

1.1. EEC initial verification marks which are affixed shall be as follows:

1.1.1. The final EEC verification mark shall be composed of two stamps:

( a ) the first consists of a letter "e" containing:

—in the upper half, the distinguishing capital letter of the State where the original check is carried out (B for Belgium, DK for Denmark, D for the Federal Republic of Germany, F for France, IR for Ireland, I for Italy, L for Luxembourg, NL for the Netherlands and UK for the United Kingdom) together where necessary, with one or two numbers identifying a territorial or administrative subdivision

—in the lower half, the identification number of the verifying agent or office;

( b ) the second stamp shall consist of the last two digits of the year of the verification, in a hexagon.

1.1.2. The mark of EEC partial verification shall consist solely of the first stamp. It shall also serve as a seal.

2. Affixing the marks

2.1. The final EEC verification mark shall be affixed at the appointed location on the instrument when the latter has been completely verified and is recognised to conform to EEC requirements.

2.2. The partial EEC verification mark shall be affixed:

2.2.1. When verification is made in several stages on the instrument or part of an instrument which fulfils the conditions laid down for operations other than those at the place of installation, at the place where the stamp-date is affixed or in any other place specified in the special provisions.

2.2.2. In all cases as a seal, in the places specified in the separate schedule for that category of instrument.

3. The stamps for use by Inspectors to affix EEC initial verification marks shall be as prescribed by the Minister for Industry and Commerce.

SCHEDULE 2.

EEC PATTERN APPROVAL SYMBOLS(¹).

1. (i) The EEC pattern approval symbols shall be a stylised letter Σ containing:

—in the upper part, the distinguishing capital letter of the State which granted the approval (B for Belgium, DK for Denmark, D for the Federal Republic of Germany, F for France, IR for Ireland, I for Italy, L for Luxembourg, NL for the Netherlands and UK for the United Kingdom) and the last two digits of the year of approval.

—in the lower part, a designation to be determined by the metrological service which granted approval (an identification number).

(¹)Council Directive No. 71/316/EEC, Annex I, 3.1, amended by Act of Accession, 22 January, 1972, Annex I. X (Technical Barriers), 12.

(ii) In the case of EEC limited approval, the letter P, having the same dimensions as the stylised letter Σ shall be placed before this letter.

2. The signs mentioned above must be affixed at a visible point on each instrument and must be legible and indelible.

3. The appropriate symbols of EEC pattern approval may be affixed by the manufacturer or his authorised representative to instruments of a pattern for which an EEC pattern approval certificate has been issued by the competent authority of a member State.

SCHEDULE 3.

EEC INITIAL VERIFICATION(¹).

General provisions applicable to instruments covered by this Order.

1. General Points

1.1. The EEC initial verification may be carried out in one or more stages (usually two).

1.2. Subject to the special provisions for each category of instrument;

1.2.1. The EEC initial verification shall be carried out in one stage on instruments which constitute a whole on leaving the factory, that is to say instruments which, theoretically, can be transferred to their place of installation without first having to be dismantled.

1.2.2. The EEC initial verification shall be carried out in two or more stages for instruments whose correct functioning depends on the conditions in which they are installed or used.

1.2.3. The first stage of the verification procedure must ensure, in particular, that the instrument conforms to the approved pattern or, in the case of instruments exempt from pattern approval, that they conform to the relevant provisions.

2. Place of the EEC initial verification

2.1. Instruments which have to be verified in two or more stages shall be verified by the metrological service territorially competent.

2.1.1. The last stage of a verification must be carried out at the place of installation.

2.1.2. The other verification stages of a verification may be carried out by the competent authority of a member State.

2.2. In particular, when the verification takes place outside the office of verification the Inspector carrying out the verification may require the applicant:

—to put at his disposal the standards and the appropriate means in material and assisting personnel for the performance of the verification,

—to provide a copy of the EEC certificate of approval.

(¹)Council Directive No. 71/316/EEC, Annex II. 1, 2.

SCHEDULE 4.

MEDIUM ACCURACY WEIGHTS(¹).

I. RECTANGULAR BAR WEIGHTS

1. Shape, constituent material and method of manufacture

1.1. Parallelepiped shape with a rigid non-projecting handle for gripping.

1.2. Material used:

1.2.1. Body of the weight: grey cast iron

1.2.2. Type 1: handle of seamless steel tubing of standard diameter

Type 2: handle of cast iron, integral with the body of the weight.

2. Adjustment cavity

Type 1

2.1. Internal cavity made up of the interior of the tubular gripping handle.

2.2. The cavity is closed by a screw-plug of drawn brass or by a brass plug in the form of a smooth disc. The screw-plug has a screwdriver slot and the smooth disc has a central lifting hole.

2.3. The plug is sealed by a lead pellet driven into an internal circular groove or into the thread of the tube.

Type 2

2.4. Internal cavity cast in one of the uprights of the weight and opening on the upper surface of this upright.

2.5. The cavity is closed by a small mild steel plate.

2.6. The plate is sealed by a lead pellet driven into a recess as shown in Illustration A.

3. Adjustment

3.1. After adjustment of the new weight by means of lead shot, two thirds of the total volume of the cavity remains empty.

4. Positioning of the EEC initial verification mark

4.1. The final EEC verification mark is stamped on the lead seal of the adjustment cavity.

5. Markings and distinctive symbols

5.1. The indications stating the nominal value of the weight, and the manufacturer's identification mark, appear on the upper surface of the central part of the weight, either indented or in relief.

5.2. The nominal value of the weight is indicated in the form:

5 kg, 10 kg, 20 kg, 50 kg.

6. Dimensions and tolerances

6.1. The dimensions to be complied with for the different weights are laid down in Illustration A (dimensions in millimetres).

6.2. The tolerances applicable to the various dimensions are the normal manufacturing tolerances.

(¹)Council Directive No. 71/317/EEC, Annexes I to IV.

ILLUSTRATION A.

RECTANGULAR BAR WEIGHTS.

dimensions a and d, be and e may be reversed.

7. Maximum permissible errors

8. Surface finish

8.1. If necessary, weights are protected against corrosion by a suitable coating resistant to wear and impact.

II CYLINDRICAL WEIGHTS

1. Shape, constituent material and method of manufacture

1.1. Cylindrical shape with a flat knob for gripping.

1.2. Material used: any material with a density of 7 to 9·5 g/cm³, of a hardness at least equal to that of cast brass, not less resistant to corrosion and not more friable than grey cast iron, and with a surface comparable to that of grey cast iron carefully cast in a mould of fine sand.

Grey cast iron may not be used for weights of a nominal value of less than 100 g.

1.3. The method of manufacture to be appropriate to the material chosen.

2. Adjusting cavity

2.1. Internal cylindrical cavity with a larger diameter in the top part of the cavity.

2.2. The cavity is closed by a screw plug of drawn brass or by a brass plug in the form of a smooth disc. The screw plug has a screwdriver slot and the smooth disc has a central lifting hole.

2.3. The plug is sealed by a lead cap driven into a circular groove cut out in the wider part of the cavity.

2.4. Weights of 1, 2, 5 and 10 g do not have an adjustment cavity.

2.5. An adjustment cavity is optional for those of 20 and 50 g.

3. Adjustment

3.1. After adjustment of the new weight by means of lead shot, two thirds of the total volume of the cavity remains empty.

4. Positioning of the EEC initial verification mark

4.1. The final EEC verification mark is stamped on the lead seal of the adjustment cavity.

4.2. Weights without adjustment cavities are stamped on the base.

5. Markings and distinctive symbols

5.1. The indications stating the nominal value of the weight, as well as the manufacturer's identification mark, appear on the upper surface of the head of the weight, either indented or in relief.

ILLUSTRATION B.

CYLINDRICAL WEIGHTS.

5.2. The nominal value of the weight may be indicated on the body of weights of from 500 g to 10 kg.

5.3. The nominal value of the weight is indicated in the form:

1 g, 2 g, 5 g, 10 g, 20 g, 50 g, 100 g, 200 g, 500 g, 1 kg, 2 kg, 5 kg, 10 kg.

6. Dimensions and their tolerances

6.1. The dimensions to be complied with for the different weights are laid down in Illustration B (dimensions in millimetres).

6.2. The tolerances applicable to the various dimensions are the normal manufacturing tolerances.

7. Maximum permissible errors

8. Surface finish

8.1. If necessary, weights are protected against corrosion by a suitable coating resistant to wear and impact; they may be polished.

SCHEDULE 5.

LIQUID METERS(¹).

INTRODUCTION

1. (i) "Volumetric meter for Liquids" means an instrument composed solely of a measuring device and an indicating device. It generally forms part of a measuring system.

(¹)Council Directive No. 71/319/EEC, Articles 2 and 5.

(ii) "Measuring systems for Liquids" means a measuring instrument comprising, as well as the meter itself and the ancillary equipment which may be associated with it, all the devices necessary for ensuring correct measurement and any devices which have been added in order, in particular, to facilitate the operations. Measuring systems are not covered by this schedule.

2. When measuring assemblies for liquids which incorporate volumetric meters for liquids bearing EEC marks and symbols are subject to initial verification, the maximum permissible errors shall be those laid down in Chapter II.

CHAPTER 1.

SPECIFICATIONS FOR METERS FOR LIQUIDS OTHER THAN WATER.

1. DEFINITIONS

1.1. "Minimum delivery" means the smallest volume of liquid which may be measured by a particular pattern.

1.2. "Cyclic volume" means the volume of liquid corresponding to the operating cycle of the measuring device, that is to say to the whole of the movements at the end of which all the internal moving parts of the measuring device return, for the first time, to their original position.

1.3. "Periodic variation" means the maximum difference, during one working cycle, between the volume displaced by the moving components and the corresponding volume shown by the indicator, the latter being connected to the measuring device without play or slip and in such a way that it indicates at the end of the cycle and for this cycle a volume equal to the cyclic volume. This difference may be reduced by a suitable calibration device.

2. INDICATING MECHANISMS

2.1. Meters must incorporate an indicating mechanism showing the measured volume in cubic centimetres or millilitres, in cubic decimetres or litres or in cubic metres.

2.2. In an indicating mechanism having one or more elements, that which is marked with the smallest scale intervals is called the "first element".

2.3. The drive between the indicating mechanism and the measuring device must be reliable, durable and effected by means of a mechanical connection or by a permanent magnet device.

2.4.1. Reading of the indications must be reliable, easy and unambiguous.

2.4.2. If the indicating mechanism incorporates several elements, the indicating mechanism as a whole must be so constructed that the reading of the indication can be performed by simple juxtaposition of the indications of the different elements.

2.5. The maximum capacity of the indicating mechanism must be of the form 1 x 10ⁿ, 2 x 10ⁿ or 5 x 10ⁿ authorised units of volume, n being a whole positive or negative number, or zero.

2.6. The movement of an element may be either continuous or discontinuous

2.7. When the moving part of an element has a continuous movement, a graduated scale and a datum mark must enable the measured quantity to be determined for every position at which the element might come to rest.

2.8. Scale intervals on the first element must be in the form 1 x 10ⁿ, 2 x 10ⁿ or 5 x 10ⁿ authorised units of volume.

2.9. Except for the element which corresponds to the maximum capacity of the indicating mechanism, the value of one revolution of an element must be of the form 10ⁿ authorised units, when the graduated scale on this unit is completely visible.

2.10. When an element consists of a fixed circular scale and a rotating pointer, the direction of rotation of this pointer must be clockwise.

2.11. On an indicating mechanism having several elements, each rotation of the moving part of the elements of which the graduation is entirely visible must correspond to the value of the scale interval of the next element.

2.12. On an indicating mechanism having several elements, the indication of an element with a discontinuous movement, other than the first element, must move forward by one figure while the preceeding element moves through not more than one-tenth of its revolution. This forward movement must cease when the preceding element indicates zero.

2.13. When an indicating mechanism has several elements and when only a part of the scale of the second and subsequent elements is visible in the windows, the movements of the latter elements must be discontinuous. The movement of the first element may be continuous or discontinuous.

2.14. If the indication is given by figures in-line and if the movement of the first element is discontinuous, the marking of one or more fixed zeros to the right of this element is permissible.

2.15. When the first element has only a portion of its scale visible in a window and has a continuous movement, there can be a resulting ambiguity in the reading which should be eliminated so far as is possible. To this end, and in order to allow for reading by interpolation, the relevant window must have, parallel to the movement of the scale, a dimension not less than 1·5 times the distance between the centre lines of two consecutively numbered graduation marks, in such a way that at least two graduation marks of which one will have a figure, are always visible. The window may be assymmetrical relative to the datum mark.

2.16. On scales having graduation marks, the marks must have the same thickness, constant along the length of the mark, which shall not exceed one quarter of the distance between the centre lines of two consecutive marks.

Marks corresponding to 1 x 10ⁿ, 2 x 10ⁿ or 5 x 10ⁿ authorised units shall only be distinguished by difference in their lengths.

2.17. The actual or apparent distance between the axes of two consecutive graduation marks must not be less than 2 millimetres.

2.18. The actual or apparent height of the figures must not be less than 4 millimetres.

3. CALIBRATING DEVICES

3.1. Meters must incorporate a calibrating device which can vary the relationship between the indicated and actual volumes of liquid passing through the meter.

3.2. When this device changes this relationship in a discontinuous manner, the consecutive increments of this relationship must never differ by more than 0·002.

3.3. Regulation by means of a bypass arrangement on the meter is prohibited.

4. SPECIAL CONDITIONS CONCERNING THE MINIMUM DELIVERY

4.1. The minimum delivery must be such that each of the following values shall be not greater than the maximum permissible error for such delivery as specified in items 2 and 3 of Chapter II:

1. the volume corresponding to a movement of 2 millimeters of the scale of the first element of the indicating mechanism and to one-fifth of the value of the scale interval, when the first element has a continuous movement;

2. the volume corresponding to two consecutive movements of the figures when the first element has a discontinuous movement;

3. the error which, under normal operation conditions, is caused by play or slip in the drive between the measuring device and the first element of the indicating mechanism;

4. twice the periodic variation.

4.2. In the determination of this minimum delivery, account must also be taken, where necessary, of the effect of the additional components on the measuring equipment, in accordance with the requirements stated in the provisions concerning this equipment.

4.3. The minimum delivery must be in the form 1 x 10ⁿ, 2 x 10ⁿ or 5 x 10ⁿ authorised units, n being a whole positive or negative number, or zero.

5. MAXIMUM AND MINIMUM RATES OF FLOW

5.1. The maximum and minimum rates of flow are specified in the certificate of approval in accordance with results obtained during the examination. The meter must be capable of operation for a determined period specified in the certificate of approval, at approximately its maximum rate of flow without showing any noticeable change in its measuring qualities.

5.2. The ratio between the maximum and minimum rates of flow must be at least equal to 10 for meters in general and to 5 for meters for liquefied gases.

6. EFFECT OF THE NATURE OF THE LIQUID, OF TEMPERATURE AND OF PRESSURE

6.1. The certificate of approval of a meter must specify the liquid or liquids for which the meter is intended, the temperature limits for the liquid to be measured where these limits are below –10° or above +50°C, as well as the maximum working pressure.

6.2. The examination carried out for the purpose of approving a model of a meter must show that the variations in error due to maximum variations in the properties of the liquids, to the pressure and the temperature of the liquid, within the limits which are to be specified in the certificate of approval, must not exceed, for each of these factors, one half of the values stated in items 1, 2 and 3 of Chapter II.

7. MAXIMUM PERMISSIBLE ERRORS ON A METER ALONE

7.1. When the initial verification of a measuring system is preceded by metrological examination of the meter alone, the maximum permissible errors at the time of this examination are equal to one half of the maximum permissible errors specified in items 1, 2 and 3 of Chapter II but not less than 0·3% of the measured quantity, if the liquid used is the same as that for which the meter is intended.

7.2. However, if the precision of measurement is not sufficient to permit the application of this requirement, the certificate of approval may increase the maximum permissible errors, within the limits of those specified in items 1, 2 and 3 of Chapter II.

7.3. Moreover, the certificate of approval may reduce and/or vary the maximum permissible errors where the verification referred to above will be carried out either with only one of the liquids provided for or with a different liquid.

In the latter case (that is to say when the liquid used in the verification is different from that for which the meter is intended), the certificate of approval may specify the rates of flow during testing at rates other than those which lie between the maximum and minimum rates of flow.

8. LEGEND

8.1 Each meter must carry, in a legible and indelible manner, either on the dial of the indicating mechanism or on a special plate, the following information:

( a ) the EEC pattern approval symbol

( b ) the identification mark or name of the manufacturer

( c ) the manufacturer's description, if any

( d ) serial number of meter and the year of manufacture

( e ) the cyclic volume.

( f ) the maximum and minimum rates of flow

( g ) the maximum working pressure

( h ) the temperature range in the case where the liquid can be measured at a temperature below –10° or above +50°C

( i ) the nature of the liquid or liquids to be measured and the limits of viscosity, kinematic or dynamic, where an indication of the nature of the liquid alone is not sufficient to determine their viscosity.

8.2. The following items must be visibly marked on the dial of the indicating mechanism:

( a ) the unit in which the measured volumes are expressed or the symbol for this unit,

( b ) the minimum delivery.

8.3. Where there is a possibility of ambiguity the direction of movement of the liquid must be indicated by an arrow on the meter casing.

8.4. On meters which measure potable liquids and which can be dismantled, the serial number or the three last figures of this number must be repeated on parts whose replacement can affect the measurement results.

8.5. The indicating mechanism may carry a special description and identifying number.

9. PLACING OF SEALS AND VERIFICATION MARKS

9.1. Sealing devices must prevent access to parts which can alter the calibration and, the dismantling, even partially, of the meter where such dismantling is not authorised in the certificate of approval (meters which measure potable liquids and which can be dismantled).

9.2. A firm location on an essential part, visible without dismantling, must be provided on the measuring device, on the indicating mechanism or on their housing for the application of the EEC verification mark.

9.3. The certificate of approval may require a location for the application of a stamp on interchangeable components of meters which can be dismantled, alongside the serial number referred to in item 8·4 in this Chapter.

CHAPTER II.

MAXIMUM PERMISSIBLE ERRORS ON MEASURING SYSTEMS.

1. When a meter is incorporated in a measuring system, the maximum permissible errors, in excess or in deficiency, at the initial verification of this syteem, under the normal working conditions and within the working limits specified in the certificate of approval, are laid down by the following table, in terms of the measured quantities:

2. However, the maximum permissible error on the maximum delivery is double the value laid down in item 1 of Chapter II and, whatever might be the measured quantity, the maximum permissible error is never less than that permitted on the minimum delivery.

3. Because of difficulties inherent in the testing facilities, the maximum permissible errors are double those given in items 1 and 2 of Chapter II where these are applicable to measuring equipment for liquid gases or other liquids measured at a temperature below – 10°C or above + 50°C as well as for equipment for which the minimum rate of flow is not greater than 1 litre per hour.

4. If, on initial verification, the errors are all of the same sense, one at least amongst them must not exceed the limits laid down in item 7.1. of Chapter I.

SCHEDULE 6.

GAS VOLUME METERS(¹).

CHAPTER I.

A. DEFINITIONS.

1. RANGE OF LOAD

The range of load of a gas meter is bounded by the maximum flow Qmax and the minimum flow Qmin.

2. CYCLIC VOLUME OF A VOLUMETRIC METER

"Cyclic volume V of a volumetric meter" means the volume of gas corresponding to a cycle of operation of the meter, that is to say to the whole of the movements of the moving components of the meter at the end of which all these components except the indicator and the intermediate transmissions return, for the first time, to their original position.

⁽¹⁾ Council Directive No. 71/318/EEC, Annex.

It is calculated by multiplying the value of the volume represented by a complete revolution of the test element, by the transmission ratio of the measuring device to the index counter.

3. OPERATING PRESSURE AND REFERENCE PRESSURE

3.1. Operating pressure

The operating pressure of a gas meter is the difference between the pressure of the gas at the inlet of the meter and the atmospheric pressure.

3.2. Reference pressure

The reference pressure pr of a gas meter is the gas pressure to which the indicated volume of gas is related.

The pressure tapping for measuring the reference pressure is laid down in Chapter III.

4. PRESSURE ABSORPTION

The pressure absorption of a gas meter is the difference between the pressures measured at the inlet and outlet of the meter during the flow of a gas.

5. OUTPUT DRIVE CONSTANT

The constant of an output drive is the value of the volume represented by a complete turn of the shaft of this drive; this value is calculated by multiplying the value of the volume represented by a complete turn of the test element by the transmission ratio of the index counter to this shaft.

B. GENERAL PROVISIONS FOR GAS VOLUME METERS.

1. GENERAL

1.1. Chapter I lays down the general provisions which must be satisfied by all gas volume meters covered by these regulations.

1.2. Chapters II and III lay down the special provisions relating to the meters concerned.

2. CONSTRUCTION

2.1. Materials

The meters must be manufactured of solid materials with low internal stresses, which change little with age, and which are sufficiently resistant to corrosion and attack by the various gases which are normally distributed or by any of their condensates.

2.2. Soundness of meters

The cases of meters must be gas-tight at the maximum operating pressure.

2.3. Protection against interference.

The meters must be so constructed that any interference which could affect the accuracy of measurement is impossible without damaging the verification marks or protective seals.

2.4. Direction of gas flow

For meters, whose indicating devices function positively only for one direction of flow, this direction must be indicated by an arrow.

This arrow is not required if the direction of gas flow is fixed by the construction.

5. Metrological properties

At a flow equal to Qmax a meter must be able to operate continuously for the time laid down in Chapter II or III without any change in its metrological performance beyond the limits specified in those chapters

3. ADDITIONAL DEVICES

3.1. Meters may be fitted with additional devices (for correction, recording supplementary indication etc.); their addition is subject to the EEC type approval procedure.

3.2. Meters may be fitted with output drives to operate a detachable indicator, a pre-payment device, or any other complementary or additional device.

3.2.1. When these controls are not used, the free end of the drive must be protected by a plug or similar arrangement which can be sealed.

3.2.2. In the case when this output drive is a shaft, it must carry an indication of the value of its constant in the form:

"I rev . . . m³" (or dm³).

3.3. Meters may be fitted with integral pulse generators.

The outlets for these generators should bear an indication of the corresponding value for one pulse in the form "1 pulse > . . . m³" (or dm³).

4. INSCRIPTIONS

4.1. Each meter must carry, grouped together either on the dial plate of the indicating device or on a special badge plate, the following inscriptions:

( a ) the number of the type approval of the meter

( b ) the identification mark or name of the manufacturer

( c ) the number and year of manufacture of the meter

( d ) the size designation of the meter: this has the form of a capital G followed by a number which is laid down in Chapters II and III

( e ) the maximum flow expressed as: ^Qmax = . . . m³/h

( f ) the minimum flow expressed as: ^Qmin = . . . m³/h (or dm³/h)

( g ) the maximum operating pressure expressed as:

Pmax . . . MN/m (or N/m ), or Pmax . . . bar (or . . . mbar)

( h ) for volumetric meters, the nominal value of the cyclic volume expressed as: V= . . . m³ (or dm³).

These inscriptions must be directly visible, easily legible, and indelible under the normal conditions of use of the meter.

4.2. The metrological service which issues the type approval may decide the cases in which the nature of the gas must also be specified on the badge plate.

4.3. The meter may also carry the commercial designation, a special series number, the name of the gas distributor, a mark indicating that it conforms to a European standard, and an indication relating to any repairs made. Unless specially authorised, any other indication or inscription is prohibited.

5. COUNTER AND TEST ELEMENT

5.1. Counter

5.1.1. The counters must be in the form of drums; however, the last element may be excepted from this rule. The drums must be calibrated in cubic metres or decimal multiples or submultiples of the cubic metre. The symbol m³ must be marked on the index plate.

5.1.1.1. The drums indicating the submultiples of the cubic metre if provided must be clearly distinguishable from the other drums, and separated from them by a clearly marked decimal point.

5.1.1.2. In cases in which the last drum is figured in decimal multiples of a cubic metre, the index plate must be marked with either:

( a ) one or more fixed zero's as appropriate after the last drum; or

( b ) the indication " x 10, x 100, x 1,000 etc" in such a way that the reading is always made in cubic metres.

5.1.2. The counter must have sufficient numbered drums to be able to indicate within one unit of the last drum, the volume passed during an operating period of one thousand hours at maximum flow rate.

5.2. Test element

5.2.1. Meters must be designed in such a way that checking can be done with sufficient accuracy. For this purpose they must incorporate in their design an integral test unit or arrangements permitting the connection of a portable test unit.

5.2.2. The integral test element may be the last element of the counter in one of the two following forms:

( a ) a continuously revolving drum carrying a graduated scale;

( b ) a pointer passing over a fixed dial having a graduated scale or a disc carrying a graduated scale moving past a fixed reference mark.

5.2.3. On the graduated scales of these test elements the unit of the graduations must be indicated clearly and unambiguously in m³ or decimal submultiples, of the m³; the beginning of the scale must be indicated by the figure zero.

5.2.3.1. The interval between, scale divisions must be constant throughout the scale and not less than 1 millimetre.

5.2.3.2. The value of the scale divisions must be in the form, 1 x 10ⁿ, 2 x 10ⁿ, or 5 x 10ⁿ m³, n being a whole positive or negative number or zero.

5.2.3.3. The graduation lines must be fine and uniform. In cases in which the division is of the form 1 x 10ⁿ or 2 x 10ⁿ m³, all the lines representing multiples of 5, and in the case of a division of the form 5 x 10ⁿ m³, all the lines representing multiples of 2, must be distinguished by a greater length.

"The needle or the fixed mark must be sufficiently thin to permit a certain and easy reading.

The controller element must be able to be supplied with a mark detachable clearly and of a sufficient shape to allow the photoelectric scan. The mark must not recover the graduation; it can take, if such be the case, the place of the figure 0. This mark must not harm the precision of reading".

5.3. Diameters of drums and dials

The diameters of drums must be at least 16 millimetres.

The diameter of the graduated scales mentioned in Chapter I B 5.2.2. (b) must be at least 32 millimetres.

5.4. Reading of the counter

The counter must be so designed that it can be read by simple juxtaposition of the figures.

5.5. Advance of figures

The advance by one figure at any part of the index must be completed whilst the figure of the immediately next lower range describes the last tenth of its course.

5.6. Removal of the counter

Meters must be so designed that the counter may be removed easily during examination.

6. MAXIMUM PERMISSIBLE ERRORS

6.1. The measuring errors are expressed as a relative value by the ratio, as a percentage, of the difference between the volume indicated and the volume actually passed by the meter, to the latter volume.

6.2. These errors relate to the measurement of volumes of air having a reference density of 1:2 kg/m³. Under normal atmospheric conditions the ambient air in a test laboratory may be considered to satisfy this condition.

6.3. The maximum permissible errors are specified in Chapters II and III; they are valid for the authorised direction of flow.

7. PRESSURE ABSORPTION

7.1. Maximum permissible values

The maximum permissible values of pressure absorption are specified in Chapters II and III.

8. APPLICATION OF VERIFICATION MARKS AND SEALS

8.1. Purpose

The application of EEC verification marks and seals on a gas meter certifies solely that the meter meets the requirements of this schedule.

8.2.1. Location

The locations of the marks must be chosen in such a way that dismantling of the part sealed will involve destruction of the marks.

8.2.2. When the inscriptions mentioned in item 4.1 of Chapter I B are on a special badge plate, one of the marks should be fixed in such a manner that it is damaged if the special plate is removed.

8.2.3. Other locations.

Locations should be provided for verification marks or sealing:

( a ) on all plates carrying an inscription required by the present schedule;

( b ) on all parts of the casing which cannot otherwise be protected against interference liable to affect the accuracy of measurement.

9. INITIAL VERIFICATION

Meters submitted for the EEC initial verification shall be in working order. If the meters are to be used with additional devices operated by output drives, these accessories must have been connected during the examination unless a later connection has been expressly authorised.

10. VERIFICATION MARKS AND SEALS

Meters having undergone successfully the verification tests:

—shall be provided with a verification mark;

—shall receive seals in the locations provided for the protection of certain components against interference liable to affect the meter characteristics.

CHAPTER II.

PROVISIONS RELATING TO GAS VOLUME METERS WITH DEFORMABLE WALLS.

1. FIELD OF APPLICATION

This Chapter applies, together with the provisions of Chapter 1, to gas meters in which the measurement of gas passed through is effected by means of measuring chambers with deformable walls.

2. RANGE OF CAPACITY AND DESIGNATION

2.1. The following table gives the authorised values for maximum flow, the upper limits of the corresponding minimum flows, and the minimum values of cyclic volumes, corresponding to the designation (G) of the meters:

2.2. If for a type of meter the value of ^Qmin is lower than the number given in the table of item 2.1 of this Chapter, the numerical value of this ^Qmin must be expressed by a number in column 3 of this table or by a decimal submultiple of this number.

2.3. Meters having a cyclic volume less than the value given in the table of item 2.1 of this Chapter may be approved provided that the model satisfies the requirements of the special endurance test prescribed.

3. DETAILS OF CONSTRUCTION

3.1. For each of the meters the difference between the calculated value of the cyclic volume V and the value of this volume specified on the meter must not exceed 5% of the latter.

3.2. Meters G1·6 to G6 inclusive may be provided with a device to prevent operation of the counter when the gas flows in a non-authorised direction.

4. TEST ELEMENT

4.1. For meters G1·6 to G6 inclusive the test element is manufactured as indicated in item 5.2.2. of Chapter I. For meters G10 to G650 inclusive the test element is:

—either manufactured as in item 5.2.2. of Chapter I;

—or is detachable.

4.2. When the test element is manufactured as in item 5.2.2. of Chapter I B the value of the scale division of the element and its graduation must satisfy the requirements of the type as shown in the following table:

4.3. For meters of which the test element is manufactured as in item 5.2.2. of Chapter I B, the typical deviation for a series of at least 30 successive measurements, carried out at a flow of the order of 0·1 ^Qmax, and under the same conditions, of a volume of air specified below must not exceed the values in the following Table:

"The volumes of air to be measured can be replaced by the volumes most closely corresponding to a whole number of turns of the controller element".

5. MAXIMUM PERMISSIBLE ERRORS

5.1. General Provisions

5.1.1. The maximum permissible errors, positive and negative, are given in the following table:

5.1.2. In EEC initial verification the errors for a meter for flows Q between ^2Qmin and ^Qmax must not all exceed 1% if they are all of the same sign.

6. PRESSURE ABSORPTION

6.1. total pressure absorption

The total pressure absorption with a flow of air of density 1·2kg/m³ at a flow rate equal to ^Qmax must not exceed on average:

6.2. Mechanical pressure absorption

The mechanical pressure absorption, that is to say the absorption of pressure with a flow of air of density 1:2kg/m³ at a flow between ^Qmin and ^2Qmin must not exceed:

The above values relate to the maximum of the mechanical pressure absorption.

6.3. Special provision

For meters for which the operating pressure exceeds 0:1 MN/m (1 bar) the provisions of item 6.2. of this Chapter regarding the mechanical pressure absorption apply, but the total pressure absorption mentioned in item 6.1. of this Chapter of these meters is not taken into consideration.

7. EEC INITIAL VERIFICATION

7.1. Accuracy tests

A meter is considered to satisfy the requirements concerning maximum permissible errors if these requirements are met at the following flow rates:

( a ) at a flow rate between ^Qmin and ^2Qmin;

( b ) at a flow rate of the order of ^1/5Qmax;

( c ) at a flow rate of ^Qmax;

( d ) at a flow rate ^0.5Qmax for meters for which the operating pressure is greater than 0·1MN/m (1 bar).

If the examination is conducted under different conditions, the guarantees must be at least equal to those obtained by the tests mentioned above.

CHAPTER III.

PROVISIONS CONCERNING GAS METERS WITH ROTARY PISTONS OR TURBINES.

1. FIELD OF APPLICATION

The present Chapter applies, together with the provision of Chapter I, to:

1.1. Rotary piston gas meters

—in which the measurement of gas passed is effected by means of measuring chambers with rotary walls.

1.2. Turbine gas meters

—in which the axial flow of gas rotates a turbine wheel and the number of revolutions of the wheel represents the volume of gas passed.

2. RANGE OF CAPACITIES

2.1. Gas meters shall have only the ranges shown in the following table which correspond to their designation (G):

and decimal multiples of the last five lines.

3. DETAILS OF CONSTRUCTION

3.1. Rotary Piston Meters

3.1.1. Meters should include upstream and downstream static pressure tappings of 3 to 5 millimetre diameter to permit measurement of the pressure drop:the pressure measured upstream will constitute the reference pressure.

3.1.2. The meters may incorporate a manual arrangement for turning the pistons provided that it cannot be used in such a way as to interfere with the correct operation of the meter.

3.1.3. The bearings of the shafts of the rotary pistons of meters of sizes G160 and above may be constructed in such a way as to provide access to them without breaking the protective seals.

3.2. Turbine Meters

3.2.1. The meters must incorporate a pressure tapping permitting, if necessary indirectly, the determination of the pressure immediately upstream of the turbine wheel as a reference pressure.

3.2.1.1. If there is a device for throttling the gas flow upstream of the rotor, the meter may incorporate, as well as the pressure tapping required by item 3.2.1. of this Chapter, another pressure tapping immediately before the throttle to permit determination of the pressure drop across the throttling device.

3.3. Pressure Tappings

3.3.1. These pressure tappings must be provided with means for closing them.

3.3.2. The pressure tappings for the reference pressure must be clearly and indelibly marked "pr" and the pressure tapping should be indicated as "p".

4. TEST ELEMENT

4.1. In applying the provisions of item 5.1.1.2. (a) and (b) of Chapter I B, the maximum value of the scale unit of the test element must be:

4.2 The scale of the test element must be numbered:

5. MAXIMUM PERMISSIBLE ERRORS

5.1. The maximum permissible errors, positive and negative, are given in the following table:

5.2. The errors must not all exceed half the maximum permissible error if they are all of the same sign.

6. EEC INITIAL VERIFICATION

6.1. Accuracy tests

A meter is considered to satisfy the requirements concerning the maximum permissible errors if the requirements are met at the following flow rates:

( a ) For rotary piston meters:

—^Qmin, ^1.5Qmin, ^0.25Qmax, ^0.5Qmax and ^Qmax;

( b ) for turbine meters:

^Qmin, ^1.5Qmin, ^2.5Qmin, ^0.25Qmax, ^0.5Qmax, and ^Qmax.

If the test is effected in other conditions, these must guarantee a result identical to the verifications mentioned above.

If the examination is conducted under different conditions, the guarantees must be at least equal to those obtained by the tests mentioned above.

6.2. The values specified in item 6·1 of this Chapter may be varied by x 5 %.

GIVEN under my Official Seal this 21st day of March, 1973.

JUSTIN KEATING,

Minister for Industry and Commerce.

EXPLANATORY NOTE.

These regulations are made to give effect, so far as necessary, to Council Directive No. 71/316/EEC, as amended by the Act annexed to the Treaty of Accession, 22nd January, 1972, at Annex 1. X (Technical Barriers), item 12, and Council Directives Nos. 71/317/EEC, 71/318/EEC, and 71/319/EEC, on the approximation of the Laws of the Member States relating to measuring instruments and methods of metrological control for medium accuracy weights, liquid meters and gas volume meters.