The Measuring Instruments (Non-Prescribed Instruments) Regulations 2006 (revoked)

PART 2 U.K. INSTRUMENT SPECIFIC REQUIREMENTS

Part A U.K. Water Meters

15.  The relevant requirements of Part 1 and the specific requirements of this Part apply to water meters. U.K.

Definitions U.K.

16.  In this Schedule—

“minimum flowrate (Q₁)” means the lowest flowrate at which the water meter provides indications that satisfy the requirements concerning the maximum permissible errors (MPEs);

“overload flowrate (Q₄)” means the highest flowrate at which the meter operates in a satisfactory manner for a short period of time without deteriorating;

“permanent flowrate (Q₃)” means the highest flowrate at which the water meter operates in a satisfactory manner under normal conditions of use, i.e. under steady or intermittent flow conditions;

“transitional flowrate (Q₂)” means the flowrate value occurring between the permanent and minimum flowrates, at which the flowrate range is divided into two zones, the “upper zone” and the “lower zone”. Each zone has a characteristic MPE.

Rated Operating Conditions U.K.

17.  The manufacturer shall specify the rated operating conditions for the instrument, in particular—

(1) The flowrate range of the water.

(a) The values for the flowrate range shall fulfil the following conditions—

(i) Q₃/Q₁ ≥ 10;

(ii) Q₂/Q₁ = 1.6;

(iii) Q₄/Q₃ = 1.25;

(b) For 5 years from the date of entry into force of these Regulations the ratio Q₂/Q₁may be: 1.5, 2.5, 4 or 6.3.

(2) The temperature range of the water.

(a) The values for the temperature range shall fulfil the following conditions—

(i) 0.1°C to at least 30°C, or

(ii) 30°C to at least 90°C.

(b) The meter may be designed to operate over both ranges.

(3) The relative pressure range of the water, the range being 0.3 bar to at least 10 bar at Q₃.

(4) For the power supply: the nominal value of the AC voltage supply and/or the limits of DC supply.

MPE U.K.

18.—(1) The MPE, positive or negative, on volumes delivered at flowrates between the transitional flowrate (Q₂) (included) and the overload flowrate (Q₄) is—

(a) 2% for water having a temperature ≤ 30 °C,

(b) 3% for water having a temperature > 30°C.

(2) The MPE, positive or negative, on volumes delivered at flowrates between the minimum flowrate (Q₁) and the transitional flowrate (Q₂) (excluded) is 5% for water having any temperature.

Permissible Effect of Disturbances U.K.

19.—(1) Electromagnetic immunity

(a) The effect of an electromagnetic disturbance on a water meter shall be such that—

(i) The change in the measurement result is no greater than the critical change value as defined in paragraph 19(1)(c), or

(ii) the indication of the measurement result is such that it cannot be interpreted as a valid result, such as a momentary variation that cannot be interpreted, memorised or transmitted as a measuring result.

(b) After undergoing an electromagnetic disturbance the water meter shall—

(i) recover to operate within MPE, and

(ii) have all measurement functions safeguarded, and

(iii) allow recovery of all measurement data present just before the disturbance.

(c) The critical change value is the smaller of the two following values—

(i) the volume corresponding to half of the magnitude of the MPE in the upper zone on the measured volume;

(ii) the volume corresponding to the MPE on the volume corresponding to one minute at flowrate Q₃.

(2) Durability

(a) After an appropriate test, taking into account the period of time estimated by the manufacturer, has been performed, the following criteria shall be satisfied—

(i) The variation of the measurement result after the durability test, when compared with the initial measurement result, shall not exceed—

(aa) 3 % of the metered volume between Q₁included and Q₂ excluded;

(bb) 1.5 % of the metered volume between Q₂ included and Q₄ included.

(ii) The error of indication for the volume metered after the durability test shall not exceed—

(aa) ± 6 % of the metered volume between Q₁ included and Q₂ excluded;

(bb) ± 2.5 % of the metered volume between Q₂ included and Q₄ included for water meters intended to meter water with a temperature between 0.1°C and 30°C;

(cc) ± 3.5 % of the metered volume between Q₂ included and Q₄ included for water meters intended to meter water with a temperature between 30°C and 90°C.

Suitability U.K.

20.—(1) The meter shall be able to be installed to operate in any position unless clearly marked otherwise.

(2) The manufacturer shall specify whether the meter is designed to measure reverse flow. In such a case, the reverse flow volume shall either be subtracted from the cumulated volume or shall be separately recorded. The same MPE shall apply to both forward and reverse flow.

(3) Water meters not designed to measure reverse flow shall either prevent reverse flow or shall withstand an accidental reverse flow without any deterioration or change in metrological properties.

Units of Measurement U.K.

21.  Metered volume shall be displayed in cubic metres.

Putting into Use U.K.

F1 22.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Textual Amendments

F1 Sch. 1 para. 22 omitted (30.10.2006) by virtue of The Measuring Instruments (Amendment) Regulations 2006 (S.I. 2006/2625), regs. 1, 2(b)

Part B U.K. Heat Meters

23.  The relevant requirements of Part 1 and the specific requirements in this Part apply to heat meters. U.K.

Definitions U.K.

24.  In this Schedule—

“θ” means the temperature of the heat-conveying liquid;

“θ_in ” means the value of θ at the inlet of the heat exchange circuit;

“θ_out ” means the value of θ at the outlet of the heat exchange circuit;

“Δ θ” means the temperature difference θ_in — θ_out with Δθ ≥ 0;

“θ_max ” means the upper limit of θ for the heat meter to function correctly within the MPEs;

“θ_min ” means the lower limit of Δθ for the heat meter to function correctly within the MPEs;

“Δθ_max ” means the upper limit of θ for the heat meter to function correctly within the MPEs;

“Δθ_min ” means the lower limit of θ for the heat meter to function correctly within the MPEs;

“q” means the flow rate of the heat conveying liquid;

“q_s” means the highest value of q that is permitted for short periods of time for the heat meter to function correctly;

“q_p” means the highest value of q that is permitted permanently for the heat meter to function correctly;

“q_i” means the lowest value of q that is permitted for the heat meter to function correctly;

“P” means the thermal power of the heat exchange;

“P_s” means the upper limit of P that is permitted for the heat meter to function correctly.

Rated operating conditions U.K.

25.  The values of the rated operating conditions shall be specified by the manufacturer as follows—

(a) for the temperature of the liquid: θ_max, θ_min,

for the temperature differences Δθ_max, θ_min,

subject to the following restrictions: Δθ_max /Δθ_min ≥ 10; Δθ_min = 3K or 5K or 10K,

(b) for the pressure of the liquid: The maximum positive internal pressure that the heat meter can withstand permanently at the upper limit of the temperature.

(c) for the flow rates of the liquid: q_s, q_p, q_i, where the values of q_p and q_i are subject to the following restriction: q_p /q_i≥ 10.

(d) for the thermal power: P_s.

Accuracy classes U.K.

26.  The following accuracy classes are defined for heat meters:

(i) 1,

(ii) 2, and

(iii) 3.

MPE applicable to complete heat meters U.K.

27.  The maximum permissible relative errors applicable to a complete heat meter, expressed in percent of the true value of each accuracy class, are—

• For class 1: E = E_f + E_t + E_c, with E_f, E_t, E_c according to paragraphs 31 (a) to (c)

• For class 2: E = E_f + E_t + E_c, with E_f, E_t, E_c according to paragraphs 31 (a) to (c)

• For class 3: E = E_f + E_t + E_c, with E_f, E_t, E_c according to paragraphs 31 (a) to (c)

Permissible influences of electromagnetic disturbances U.K.

28.—(1) The instrument shall not be influenced by static magnetic fields and by electromagnetic fields at mains frequency.

(2) The influence of an electromagnetic disturbance shall be such that the change in the measurement result is not greater than the critical change value as laid down in sub-paragraph (3) or the indication of the measurement result is such that it cannot be interpreted as a valid result.

(3) The critical change value for a complete heat meter is equal to the absolute value of the MPE applicable to that heat meter (see paragraph 27).

Durability U.K.

29.—(1) After an appropriate test, taking into account the period of time estimated by the manufacturer, has been performed, the following criteria shall be satisfied—

(a) Flow sensors— The variation of the measurement result after the durability test, when compared with the initial measurement result, shall not exceed the critical change value.

(b) Temperature sensors—The variation of the measurement result after the durability test, when compared with the initial measurement result, shall not exceed 0.1°C.

Inscriptions on a heat meter U.K.

30.  The following must be inscribed on the meter—

(a) accuracy class;

(b) limits of flow rate;

(c) limits of temperature;

(d) limits of temperature difference;

(e) place of the flow sensor installation: flow or return;

(f) indication of the direction of flow.

Sub-assemblies U.K.

31.  The provisions for sub-assemblies may apply to sub-assemblies manufactured by the same or different manufacturers. Where a heat meter consists of sub-assemblies, the essential requirements for the heat meter apply to the sub-assemblies as relevant. In addition, the following apply—

(a) The relative MPE of the flow sensor, expressed in %, for accuracy classes—

(i) Class 1: E_f = (1 + 0.01 q_p /q), but not more than 5%,

(ii) Class 2: E_f = (2 + 0.02 q_p /q), but not more than 5%,

(iii) Class 3: E_f = (3 + 0.05 q_p/q), but not more than 5%,

where the error E_f relates the indicated value to the true value of the relationship between flow sensor output signal and the mass or the volume.

(b) The relative MPE of the temperature sensor pair, expressed in %—

E_t = (0.5 + 3 Δθ_min /Δθ),

where the error E_t relates the indicated value to the true value of the relationship between temperature sensor pair output and temperature difference.

(c) The relative MPE of the calculator, expressed in %—

E_c = (0.5 + Δθ_min /Δθ),

where the error E_c relates the value of the heat indicated to the true value of the heat.

(d) The critical change value for a sub-assembly of a heat meter is equal to the respective absolute value of the MPE applicable to the sub-assembly (see sub-paragraphs (a), (b) or (c)).

(e) Inscriptions on the sub-assemblies—

(i) Flow sensor—

(aa) Accuracy class;

(bb) Limits of flow rate;

(cc) Limits of temperature;

(dd) Nominal meter factor (e.g. litres/pulse) or corresponding output signal;

(ee) Indication of the direction of flow;

(ii) Temperature sensor pair—

(aa) Type identification (e.g. Pt 100);

(bb) Limits of temperature;

(cc) Limits of temperature difference;

(iii) Calculator—

(aa) Type of temperature sensors:

— Limits of temperature;

— Limits of temperature difference;

— Required nominal meter factor (e.g. litres/pulse) or corresponding input signal coming from the flow sensor;

— Place of the flow sensor installation: flow or return.

Putting into use U.K.

F2 32.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Textual Amendments

F2 Sch. 1 para. 32 omitted (30.10.2006) by virtue of The Measuring Instruments (Amendment) Regulations 2006 (S.I. 2006/2625), regs. 1, 2(b)

Part C U.K. Measuring System for the Continuous and Dynamic Measurement of Quantities of Liquids other than Water

33.—(1) The relevant requirements of Part 1 and the specific requirements of this Part apply to measuring systems intended for the continuous and dynamic measurement of quantities (volumes or masses) of liquids other than water. U.K.

(2) If appropriate, the terms “volume” and “L” in this Part can be read as “mass” and “kg”.

Definitions U.K.

34.  In this Part C—

“associated measuring instrument” means an instrument connected to the calculator for measuring certain quantities which are characteristic of the liquid, with a view to making a correction and/or conversion;

“base conditions” means the specified conditions to which the measured quantity of liquid at metering conditions is converted;

“calculator” means a part of a meter that receives the output signals from the measurement transducer(s) and possibly, from associated measuring instruments and displays the measurement results;

“conversion device” means a part of the calculator which by taking account of the characteristics of the liquid (e.g. temperature, density) measured using associated measuring instruments, or stored in a memory, automatically converts—

(a)

the volume of the liquid measured at metering conditions into a volume at base conditions and/or into mass, or

(b)

the mass of the liquid measured at metering conditions into a volume at metering conditions and/or into a volume at base conditions;

Note: A conversion device includes the relevant associated measuring instrument.

“direct indication” means the indication, either volume or mass, corresponding to the measure and that the meter is physically capable of measuring;

Note: The direct indication may be converted into another quantity using a conversion device.

“flowrate range” means the range between the minimum flowrate (Q_min ) and maximum flowrate (Q_max);

“fuel dispenser” means a measuring system intended for the refuelling of motor vehicles, small boats and small aircraft;

“interruptible/non interruptible” means the liquid flow can/cannot be stopped easily and rapidly;

“measuring system” means a system that comprises the meter itself and all devices required to ensure correct measurement or intended to facilitate the measuring operations;

“meter” means an instrument designed to measure continuously, memorise and display the quantity at metering conditions of liquid flowing through the measurement transducer in a closed, fully charged conduit;

“minimum measured quantity (MMQ)” means the smallest quantity of liquid for which the measurement is metrologically acceptable for the measuring system;

“self-service arrangement” means an arrangement that allows the customer to use a measuring system for the purposes of obtaining liquid for his own use;

“self-service device” means a specific device that is part of a self-service arrangement and which allows one or more measuring systems to perform in this self-service arrangement.

Rated operating conditions U.K.

35.—(1) The manufacturer shall specify the rated operating conditions for the instrument, in particular—

(2) The flowrate range.

The flowrate range is subject to the following conditions—

(a) the flowrate range of a measuring system shall be within the flowrate range of each of its elements, in particular the meter.

(b) meter and measuring system—

Table 2

Specific measuring system	Characteristic of liquid	Minimum ratio of Qmax : Qmin
Fuel dispenser	Not liquefied gases	10:1
	Liquefied gases	5:1
Measuring system	Cryogenic liquids	5:1
Measuring systems on pipeline and systems for loading ships	All liquids	Suitable for use
All other measuring systems	All liquids	4:1

(3) The properties of the liquid to be measured by the instrument by specifying the name or type of the liquid or its relevant characteristics, for example—

(a) temperature range;

(b) pressure range;

(c) density range;

(d) viscosity range.

(4) The normal value of the AC voltage supply and/or limits of the DC voltage supply.

(5) The base conditions for converted values.

Note: Sub-paragraph (4) is without prejudice to the member States' obligations to require use of a temperature of either 15°C in accordance with Article 3(1) of Council Directive 92/81/EEC of 19th October 1992 on the harmonisation of the structures of excise duties on mineral oils M1 or, for heavy fuel oils, LPG and methane, another temperature pursuant to Article 3(2) of that Directive.

Marginal Citations

M1 OJ L 316, 31.10.92, p. 12. Directive abolished by Directive 2003/96/EC (OJ L 283, 31.10.03, p.51).

Accuracy classification and maximum permissible errors (MPEs) U.K.

36.—(1) For quantities equal to or greater than 2 litres the MPE on indications is:

Table 3

	Accuracy class
	0.3	0.5	1.0	1.5	2.5
Measuring systems (A)	0.3%	0.5%	1.0%	1.5%	2.5%
Meters (B)	0.2%	0.3%	0.6%	1.0%	1.5%

(2) For quantities less than two litres the MPE on indications is:

Table 4

Measured volume V	MPE
V < 0.1 L	4 × value in Table 3, applied to 0.1 L
0.1 L ≤ V < 0.2 L	4 × value in Table 3
0.2 L ≤ V < 0.4 L	2 × value in Table 3, applied to 0.4 L
0.4 L ≤ V < 1 L	2 × value in Table 3
1 L ≤ V < 2 L	Value in Table 3, applied to 2 L

(3) However, no matter what the measured quantity may be, the magnitude of the MPE is given by the greater of the following two values—

(a) the absolute value of the MPE given in Table 3 or Table 4;

(b) the absolute value of the MPE for the minimum measured quantity (E_min ).

(4)  

(a) For minimum measured quantities greater than or equal to 2 litres the following conditions apply—

(i) Condition 1—

E_min shall fulfil the condition: E_min ≥ 2 R, where R is the smallest scale interval of the indication device.

(ii) Condition 2—

E_min is given by the formula: E_min = (2MMQ) × (A/100), where—

(aa) MMQ is the minimum measured quantity,

(bb) A is the numerical value specified in line A of Table 3.

(b) For minimum measured quantities of less than two litres, condition 1 applies and E_min is twice the value specified in Table 4, and related to line A of Table 3.

(5) Converted indication—

In the case of a converted indication the MPEs are as in line A of Table 3.

(6) Conversion devices—

(a) MPEs on converted indications due to a conversion device are equal to ± (A–B), A and B being the values specified in Table 3.

(b) Parts of conversion devices that can be tested separately—

(i) Calculator

MPEs on quantities of liquid indications applicable to calculation, positive or negative, are equal to one-tenth of the MPEs as defined in line A of Table 3;

(ii) Associated measuring instruments

Associated measuring instruments shall have an accuracy at least as good as the values in Table 5—

Table 5

MPE on measurements	Accuracy classes of the measuring system
	0.3	0.5	1.0	1.5	2.5
Temperature	± 0.3 °C	± 0.5 °C			± 1.0 °C
Pressure	Less than 1 MPa: ± 50 kPa From 1 to 4 MPa: ± 5 % Over 4 MPa: ± 200 kPa
Density	± 1kg/m3		± 2kg/m3		± 5kg/m3

These values apply to the indication of the characteristic quantities of the liquid displayed by the conversion device.

(iii) Accuracy for calculating function—

The MPE for the calculation of each characteristic quantity of the liquid, positive or negative, is equal to two fifths of the value fixed in (ii).

(7) The requirement (i) in sub-paragraph (6) applies to any calculation, not only conversion.

Maximum permissible effect of disturbances U.K.

37.—(1) The effect of an electromagnetic disturbance on a measuring system shall be one of the following—

(a) the change in the measurement result is not greater than the critical change value as defined in sub-paragraph (2), or

(b) the indication of the measuring result shows a momentary variation that cannot be interpreted, memorised or transmitted as a measuring result. Furthermore, in the case of an interruptible system, this can also mean the impossibility to perform any measurement, or

(c) the change in the measurement result is greater than the critical change value, in which case the measuring system shall permit the retrieval of the measuring result just before the critical value occurred and cut off the flow.

(2) The critical change value is the greater of MPE/5 for a particular measured quantity or E_min.

Durability U.K.

38.  After an appropriate test, taking into account the period of time estimated by the manufacturer, has been performed, the following criterion shall be satisfied—

The variation of the measurement result after the durability test, when compared with the initial measurement result, shall not exceed the value for meters specified in line B of Table 3.

Suitability U.K.

39.—(1) For any measured quantity relating to the same measurement, the indications provided by various devices shall not deviate one from another by more than one scale interval where devices have the same scale interval. In the case where the devices have different scale intervals, the deviation shall not be more than that of the greatest scale interval.

(2) In the case of a self-service arrangement the scale intervals of the main indicating device on the measuring system and the scale intervals of the self-service device shall be the same and results of measurement shall not deviate one from another.

(3) It shall not be possible to divert the measured quantity in normal conditions of use unless it is readily apparent.

(4) Any percentage of air or gas not easily detectable in the liquid shall not lead to a variation of error greater than—

(a) 0.5 % for liquids other than potable liquids and for liquids of a viscosity not exceeding 1 mPa.s, or

(b) 1 % for potable liquids and for liquids of a viscosity exceeding 1 mPa.s.

The allowed variation shall never be smaller than 1% of MMQ. This value applies in the case of air or gas pockets.

(5) Instruments for direct sales

(a) A measuring system for direct sales shall be provided with means for resetting the display to zero.

(b) It shall not be possible to divert the measured quantity.

(c) The display of the quantity on which the transaction is based shall be permanent until all parties in the transaction have accepted the measurement result.

(d) Measuring systems for direct sales shall be interruptible.

(e) Any percentage of air or gas in the liquid shall not lead to a variation of error greater than the values specified in sub-paragraph (4).

(6) Fuel Dispensers

(a) Displays on fuel dispensers shall not be capable of being reset to zero during a measurement.

(b) The start of a new measurement shall be inhibited until the display has been reset to zero.

(c) Where a measuring system is fitted with a price display, the difference between the indicated pride and the price calculated from the unit price and the indicated quantity shall not exceed the price corresponding to E_min. This difference need not be less than the smallest monetary value.

Power supply failure U.K.

40.  A measuring system shall either be provided with an emergency power supply device that will safeguard all measuring functions during the failure of the main power supply device or be equipped with means to save and display the data present in order to permit the conclusion of the transaction in progress and with means to stop the flow at the moment of the failure of the main power supply device.

Putting into use U.K.

41.   

Table 6

1 However, Member States may require measuring systems of accuracy class 0.3 or 0.5 when used for the levying of duties on mineral oils when (un)loading ships and rail and road tankers. Note: However, the manufacturer may specify a better accuracy for a certain type of measuring system
Accuracy Class	Types of Measuring system
0.3	Measuring systems on pipeline
0.5	All measuring systems if not differently stated elsewhere in this Table, in particular: — fuel dispensers (not for liquified gases), — measuring system on road tankers for liquids of low viscosity (< 20 mPa.s), — measuring systems for (un)loading ships and rail and road tankers1, — measuring systems for milk, — measuring systems for refuelling aircraft.
1.0	Measuring system for liquefied gases under pressure measured at a temperature equal to or above -10°C Measuring systems normally in class 0.3 or 0.5 but used for liquids— — whose temperature is less than -10°C or greater than 50°C; — whose dynamic viscosity is higher than 1000 mPa.s; — whose maximum volumetric flowrate is not higher than 20 L/h.
1.5	Measuring systems for liquefied carbon dioxide Measuring systems for liquefied gases under pressure measured at a temperature below –10ºC (other than cryogenic liquids)
2.5	Measuring systems for cryogenic liquids (temperature below –153ºC)

Units of measurement U.K.

42.  The metered quantity shall be displayed in millilitres, cubic centimetres, litres, cubic metres, grams, kilogram or tonnes.

Part D U.K. Automatic Weighing Instruments

43.  The relevant requirements of Part 1 and the specific requirements of this Part apply to the automatic weighing instruments set out below, intended to determine the mass of a body by using the action of gravity on that body. U.K.

Rated Operating Conditions U.K.

44.  The manufacturer shall specify the rated operating conditions for the instrument as follows—

(a) For the measurand—

The measuring range in terms of its maximum and minimum capacity.

(b) For the electrical supply influence quantities—

(i) in case of AC voltage supply: the nominal AC voltage supply, or the AC voltage limits;

(ii) in case of DC voltage supply: the nominal and minimum DC voltage supply, or the DC voltage limits.

(c) For the mechanical and climatic influence quantities—

(i) the minimum temperature range is 30°C unless specified otherwise in this Part.

(ii) the mechanical environment classes according to Part 1, paragraph 3(5)(b) are not applicable. For instruments which are used under special mechanical strain, e.g. instruments incorporated into vehicles, the manufacturer shall define the mechanical conditions of use.

(d) For other influence quantities (if applicable)—

(i) the rate(s) of operation;

(ii) the characteristics of the product(s) to be weighed.

Suitability U.K.

45.—(1) Means shall be provided to limit the effects of tilt, loading and rate of operation such that maximum permissible errors (MPEs) are not exceeded in normal operation.

(2) Adequate material handling facilities shall be provided to enable the instrument to respect the MPEs during normal operation.

(3) Any operation control interface shall be clear and effective.

(4) The integrity of the display (where present) shall be verifiable by the operator.

(5) Adequate zero setting capability shall be provided to enable the instrument to respect the MPEs during normal operation.

(6) Any result outside the measurement range shall be identified as such, where a printout is possible.

Automatic Catchweighers U.K.

46.—(1) In addition to the requirements set out in paragraphs 44 and 45, the following specific requirements shall apply in relation to automatic catchweighers.

(2) Definitions—

“weight labeller” means an automatic catchweigher that labels individual articles with the weight value;

“weight/price labeller” means an automatic catchweigher that labels individual articles with the weight value, and price information.

(3) Accuracy Classes

(a) Instruments are divided into primary categories designated by X or Y as specified by the manufacturer.

(b) These categories are divided into four accuracy classes—

(i) XI, XII, XIII and XIV and

(ii) Y(I), Y(II), Y(a) and Y(b)

which shall be specified by the manufacturer.

(c) Category X applies to instruments used to check pre-packages made up in accordance with the requirements of Council Directive 75/106/EEC of 19 December 1974 on the approximation of the laws of the member States relating to the making-up by volume of certain pre-packaged liquids M2 and of Council Directive 76/211/EEC of 20th January 1976 on the approximation of the laws of the member States relating to the making-up by weight or by volume of certain pre-packaged products M3 applicable to pre-packages.

(d) The accuracy classes are supplemented by a factor (x) that qualifies the maximum permissible standard deviation as specified in sub-paragraph (3)(b).

(e) The manufacturer shall specify the factor (x), where (x) shall be ≤ 2 and in the form 1 × 10^k, 2 × 10^k or 5 × 10^k, where k is a negative whole number or zero.

(f) Category Y applies to all other automatic catchweighers.

(4) MPE

(a) Mean error Category X and MPE Category Y Instruments

Table 7

Net Load (m) in verification scale intervals (c)								Maximum permissible mean error	Maximum permissible error
XI	Y(1)	XII	Y(II)	XIII	Y(a)	XIV	Y(b)	X	Y
0 < m ≤ 50 000		0 < m ≤ 5 000		0 < m ≤ 500		0 < m ≤ 50		± 0.5 e	±1 e
50 000 < m ≤ 200 000		5 000 < m ≤ 20 000		500 < m ≤ 2 000		50 < m ≤ 200		± 1.0 e	±1.5 e
200 000 < m		20 000 < m ≤ 100 000		2 000 < m ≤ 10 000		200 < m ≤ 1 000		± 1.5 e	± 2 e

(b) Standard deviation—

Maximum permissible value for the standard deviation of a class X (x) instrument is the result of the multiplication of the factor (x) by the value in Table 8 below.

Table 8

Net Load (m)	Maximum permissible standard deviation for class X(1)
m ≤ 50g	0.48%
50 g < m ≤ 100 g	0.24 g
100 g < m ≤ 200 g	0.24 %
200 g < m ≤ 300 g	0.48 g
300 g < m ≤ 500 g	0.16 %
500g < m ≤ 1 000 g	0.8 g
1 000 g < m ≤ 10 000 g	0.08 %
10 000 g < m ≤ 15 000 g	8 g
15 000 g < m	0.053 %
For class XI and XII (x) shall be less than 1. For class XIII (x) shall be not greater than 1. For class XIV (x) shall be greater than 1.

(c) Verification scale interval – single interval instruments

Table 9

Accuracy classes		Verification scale interval	Number of verification scale intervals n= Max/e
			Minimum	Maximum
XI	Y(I)	0.001 g ≤ e	50 000	–
XII	Y(II)	0.001 g ≤ e ≤0.05 g	100	100 000
		0.1 g ≤ e	5 000	100 000
XIII	Y(a)	0.1 g ≤ e ≤ 2 g	100	10 000
		5 g ≤ e	500	10 000
XIV	Y(b)	5 g ≤ e	100	1 000

(d) Verification scale interval – multi-interval instruments

Table 10

1 For i = r the corresponding column of Table 9 applies with e replaced by er.
Accuracy classes		Verification scale interval	Number of verification scale intervals n=Max/e
			Minimum value1 n = Maxi/e (i+1)	Maximum n=Maxi/ei
XI	Y(I)	0.001 g ≤ ei	50 000	–
XII	Y(II)	0.001 g ≤ei≤0.05 g	5 000	100 000
		0.1 g ≤ ei	5 000	100 000
XIII	Y(a)	0.1 g ≤ ei	500	10 000
XIV	Y(b)	5 g ≤ ei	50	1 000

Where:

(i) i= 1, 2, ...r

(ii) i = partial weighing range

(iii) r = total number of partial ranges

(5) Measurement Range

In specifying the measurement range for class Y instruments the manufacturer shall take account that the minimum capacity shall not be less than:

(a) class Y(I): 100 e

(b) class Y(II): 20 e for 0.001 g ≤ e ≤ 0.05 g, and 50 e for 0.1 g ≤ e

(c) class Y(a): 20 e

(d) class Y(b): 10 e

(e) Scales used for grading, e.g. postal scales and garbage weighers: 5 e

(6) Dynamic setting

(a) The dynamic setting facility shall operate within a load range specified by the manufacturer.

(b) When fitted, a dynamic setting facility that compensates for the dynamic effects of the load in motion shall be inhibited from operating outside the load range, and shall be capable of being secured.

(7) Performance under influence factors and electromagnetic disturbances

(a) The MPEs due to influence factors are—

(i) For category X instruments—

(aa) for automatic operation, as specified in Tables 7 and 8;

(bb) for static weighing in non-automatic operation, as specified in Table 7.

(ii) For category Y instruments—

(aa) for each load in automatic operation, as specified in Table 7;

(bb) for static weighing in non-automatic operation, as specified in category X in Table 7.

(b) The critical change value due to a disturbance is one verification scale interval.

(c) Temperature range

(i) For class XI and Y(I) the minimum range is 5° C.

(ii) For class XII and Y(II) the minimum range is 15° C.

Marginal Citations

M2 OJ L 42, 15.2.75, p.1. Directive as last amended by Directive 89/676/EEC (O) L 398, 30.12.89, p. 18).

M3 OJ L 46, 21.2.76, p.1. Directive as last amended by the EEA Agreement.

Automatic gravimetric filling instruments U.K.

47.—(1) In addition to the requirements set out in paragraphs 44 and 45, the following specific requirements shall apply in relation to automatic gravimetric filling instruments.

(2) Accuracy classes

(a) The manufacturer shall specify both the reference accuracy class Ref(x), and the operational accuracy class(es) X(x).

(b) An instrument type is designated a reference accuracy class Ref(x), corresponding to the best possible accuracy for instruments of the type. After installation, individual automatic gravimetric filling instruments are designed for one or more operational accuracy classes, X(x), having taken account of the specific products to be weighed. The class designation factor (x) shall be ≤ 2, and in the form 1 × 10^k, 2 × 10^k or 5 × 10^k where k is a negative whole number or zero.

(c) The reference accuracy class, Ref(x) is applicable for static loads.

(d) For the operational accuracy class X(x), X is a regime relating accuracy to load weight and (x) is a multiplier for the limits of error specified for class X(1) in sub-paragraph 3(b)

(3) MPE

(a) Static weighing error

(i) For static loads under rated operating conditions, the MPE for reference accuracy class Ref(x), shall be 0.312 of the maximum permissible deviation of each fill from the average: as specified in Table 11; multiplied by the class designation factor (x).

(ii) For instruments where the fill may be made up from more than one load (e.g. cumulative or selective combination weighers) the MPE for static loads shall be the accuracy required for the fill as specified in sub-paragraph (3)(b) (i.e. not the sum of the maximum permissible deviation for the individual loads).

(b) Deviation from average fill

Table 11

Value of the mass of the fills (m) in grams	Maximum permissible deviation of each fill from the average for class X(1)
m ≤ 50	7.2%
50 < m ≤ 100	3.6 grams
100 < m ≤ 200	3.6 %
200 < m ≤ 300	7.2 grams
300 < m ≤ 500	2.4 %
500 < m ≤ 1 000	12 grams
1 000 < m ≤ 10 000	1.2 %
10 000 < m ≤ 15 000	120 grams
15 000 < m	0.8 %
Note: The calculated deviation of each fill from the average may be adjusted to take account of the effect of material particle size

(c) Error relative to pre-set value (setting errors)

For automatic gravimetric filling instruments where it is possible to pre-set a fill weight, the maximum difference between the pre-set value and the average mass of the fills shall not exceed 0.312 of the maximum permissible deviation of each fill from the average, as specified in Table 11.

(4) Performance Under Influence Factor and Electromagnetic Disturbance

(a) The MPE due to influence factors shall be as specified in sub-paragraph (3)(a).

(b) The critical change value due to a disturbance is a change of the static weight indication equal to the MPE as specified in sub-paragraph (3)(a) calculated for the rated minimum fill, or a change that would give equivalent effect on the fill in the case of instruments where the fill consists of multiple loads. The calculated critical change value shall be rounded to the next higher scale interval (d).

(c) The manufacturer shall specify the value of the rated minimum fill.

Discontinuous Totalisers U.K.

48.—(1) In addition to the requirements set out in paragraphs 44 and 45, the following specific requirements shall apply in relation to discontinuous totalisers.

(2) Accuracy Classes

Discontinuous totalisers are divided into four accuracy classes, as follows—

(i) 0.2;

(ii) 0.5;

(iii) 1; and

(iv) 2.

(3) MPE

Table 12

Accuracy class	MPE of Totalised load
0.2	±0.10%
0.5	±0.25%
1	±0.50%
2	±1.00%

(4) Totalisation scale interval

The totalisation scale interval (d_t) shall be in the range:

0.01 % Max ≤ d_t ≤ 0.2 % Max

(5) Minimum Totalised Load (Σ_min)

The minimum totalised load (Σ_min) shall be not less than the load at which the MPE is equal to the totalisation scale interval (d_t) and not less than the minimum load as specified by the manufacturer.

(6) Zero Setting

Instruments that do not tare weigh after each discharge shall have a zero setting device. Automatic operation shall be inhibited if zero indication varies by—

(a) 1 d_t on instruments with automatic zero setting device; or

(b) 0.5 d_t on instruments with a semi-automatic, or non-automatic, zero setting device.

(7) Operator Interface

Operator adjustments and reset function shall be inhibited during automatic operation.

(8) Printout

On instruments equipped with a printing device, the reset of the total shall be inhibited until the total is printed. The printout of the total shall occur if automatic operation is interrupted.

(9) Performance under influence factors and electromagnetic disturbances

(a) The MPE due to influence factors shall be as specified in Table 13.

Table 13

Load (m) in totalisation scale intervals dt	MPE
0 < m ≤ 500	±0.5dt
500 < m ≤ 2 000	±1.0dt
2 000 < m ≤ 10 000	±1.5dt

(b) The critical change value due to a disturbance is one totalisation scale interval for any weight indication and any stored total.

Continuous Totalisers U.K.

49.—(1) In addition to the requirements set out in paragraphs 44 and 45, the following specific requirements shall apply in relation to continuous totalisers.

(2) Accuracy Classes

Continuous totalisers are divided into three accuracy classes, as follows—

(a) 0.5;

(b) 1; and

(c) 2.

(3) Measurement Range

(a) The manufacturer shall specify the measurement range, the ratio between the minimum net load on the weighing unit and the maximum capacity, and the minimum totalised load.

(b) The minimum totalised load Σ_min shall not be less than—

(i) 800 d for class 0.5,

(ii) 400 d for class 1,

(iii) 200 d for class 2,

where d is the totalisation scale interval of the general totalisation device.

(4) MPE

Table 14

Accuracy class	MPE for totalised load
0.5	± 0.25%
1	± 0.5%
2	± 1.0%

(5) Speed of the Belt

The speed of the belt shall be specified by the manufacturer. For single-speed beltweighers, and variable-speed beltweighers having a manual speed setting control, the speed shall not vary by more than 5% of the nominal value. The product shall not have a different speed than the speed of the belt.

(6) General Totalisation Device

It shall not be possible to reset the general totalisation device to zero.

(7) Performance under influence factor and electromagnetic disturbance

(a) The MPE due to influence factor, for a load not less than Σ_min, shall be 0.7 times the appropriate value specified in Table 14, rounded to the nearest totalisation scale interval (d).

(b) The critical change value due to a disturbance shall be 0.7 times the appropriate value specified in Table 14, for a load equal to Σ_min, for the designated class of beltweigher, rounded up to the next higher totalisation scale interval (d).

Automatic Rail-weighbridges U.K.

50.—(1) In addition to the requirements set out in paragraphs 44 and 45, the following specific requirements shall apply in relation to automatic rail-weighbridges.

(2) Accuracy classes

Automatic rail-weighbridges are divided into four accuracy classes as follows:

(i) 0.2;

(ii) 0.5;

(iii) 1; and

(iv) 2.

(3) MPE

(a) The MPEs for weighing-in-motion of a single wagon or a total train are shown in Table 15.

Table 15

Accuracy class	MPE
0.2	± 0.1 %
0.5	± 0.25 %
1	± 0.5 %
2	± 1.0 %

(b) The MPEs for the weight of coupled or uncoupled wagons weighing-in-motion shall be one of the following values, whichever is the greatest:

(i) the value calculated according to Table 15, rounded to the nearest scale interval;

(ii) the value calculated according to Table 15, rounded to the nearest scale interval for a weight equal to 35% of the maximum wagon weight (as inscribed on the descriptive markings);

(iii) one scale interval (d).

(c) The MPEs for the weight of train weighing-in-motion shall be one of the following values, whichever is the greatest:

(i) the value calculated according to Table 15, rounded to the nearest scale interval;

(ii) the value calculated according to Table 15, for the weight of a single wagon equal to 35% of the maximum wagon weight (as inscribed on the descriptive markings) multiplied by the number of reference wagons (not exceeding 10) in the train, and rounded to the nearest scale interval;

(iii) one scale interval (d) for each wagon in the train, but not exceeding 10 d.

(d) When weighing coupled wagons; the errors of not more than 10% of the weighing results taken from one or more passes of the train may exceed the appropriate MPE given in paragraph 3(b), but shall not exceed twice the MPE.

(4) Scale interval (d)

The relationship between the accuracy class and the scale interval shall be as specified in Table 16.

Table 16

Accuracy class	Scale interval (d)
0.2	d ≤ 50 kg
0.5	d ≤ 100 kg
1	d ≤ 200 kg
5	d ≤ 500 kg

(5) Measurement range

(a) The minimum capacity shall not be less than 1 t, and not greater than the value of the result of the minimum wagon weight divided by the number of partial weighings.

(b) The minimum wagon weight shall not be less than 50 d.

(6) Performance under influence factor and electromagnetic disturbance

(a) The MPE due to an influence factor shall be as specified in Table 17.

Table 17

Load (m) in verification scale intervals (d)	MPE
0 < m ≤ 500	± 0.5 d
500 < m ≤ 2 000	± 1.0 d
2 000 < m ≤ 10 000	± 1.5 d

(b) The critical change value due to a disturbance is one scale interval.

Part E U.K. Material Measures

51.—(1) The relevant essential requirements of Part 1 and the specific requirements of this Part apply to material measures of length and capacity serving measures. U.K.

(2) The requirement for the supply of a copy of declarations of conformity may be interpreted as applying to a batch or consignment rather than each individual instrument.

Material measures of length U.K.

52.—(1) Reference Conditions

(a) For tapes of length equal to or greater than five metres, the maximum permissible errors (MPEs) are to be met when a tractive force of fifty newtons or other force values as specified by the manufacturer and marked on the tape accordingly, or in the case of rigid or semi-rigid measures no tractive force is needed, is applied.

(b) The reference temperature is 20°C unless otherwise specified by the manufacturer and marked on the measure accordingly.

(2) MPE

(a) The MPE, positive or negative in mm, between two non-consecutive scale marks is (a + bL), where—

(i) L is the value of the length rounded up to the next whole metre; and

(ii) a and b are given in Table 18 below.

(b) When a terminal interval is bounded by a surface, the MPE for any distance beginning at this point is increased by the value c given in Table 18.

Table 18

1 Applies to the tape/dip weight combinations
2 If the nominal tape length exceeds 30m, an additional MPE of 0.75 mm shall be permitted for each 30m of tape length.
Accuracy Class	a (mm)	b (mm)	c (mm)
I	0.1	0.1	0.1
II	0.3	0.2	0.2
III	0.6	0.4	0.3
D – special class for dipping tapes1 Up to and including 30 m2	1.5	zero	Zero
S – special class for tank strapping tapes For each 30 m length when the tape is supported on a flat surface	1.5	zero	Zero

(c) Dip tapes may also be of Classes I or II in which case for any length between two scale marks, one of which is on the sinker and the other on the tape, the MPE is ± 0.6 mm when application of the formula gives a value of less than 0.6 mm.

(d) The MPE for the length between consecutive scale marks, and the maximum permissible difference between two consecutive intervals, are given in Table 19 below.

Table 19

Length i of the interval	MPE or difference in millimetres according to accuracy class
	I	II	III
i ≤ 1 mm	0.1	0.2	0.3
1 mm < i ≤ 1 cm	0.2	0.4	0.6

(e) Where a rule is of the folding type, the jointing shall be such as not to cause any errors, supplementary to those above, exceeding 0.3 mm for Class II, and 0.5 mm for Class III.

(3) Materials

(a) Materials used for material measures shall be such that length variations due to temperature excursions up to ± 8°C about the reference temperature do not exceed the MPE. This does not apply to Class S and Class D measures where the manufacturer intends that thermal expansion corrections shall be applied to observed readings where necessary.

(b) Measures made from material whose dimensions may alter materially when subjected to a wide range of relative humidity, may only be included in Classes II or III.

(4) Markings

The nominal value shall be marked on the measure. Millimetre scales shall be numbered every centimetre and measures with a scale interval greater than 2 cm shall have all scale marks numbered.

Capacity serving measures U.K.

53.—(1) The requirement for the instrument to bear information in respect of its accuracy shall not apply.

(2) Definitions

In these Regulations—

“brim measure” means a capacity serving measure for which the internal volume is equal to the nominal capacity;

“capacity” means the internal volume for brim measures or internal volume to a filling mark for line measures.

“line measure” means a capacity serving measure marked with a line to indicate nominal capacity;

“transfer measure” means a capacity serving measure from which it is intended that the liquid is decanted prior to consumption;

(3) Reference Conditions

(a) Temperature: the reference temperature for measurement of capacity is 20°C.

(b) Position for correct indication: free standing on a level surface.

(4) MPE

Table 20

	Line	Brim
Transfer of measures
< 100 ml	± 2 ml	- 0 + 4 ml
≥ 100 ml	± 3 %	- 0 + 6%
Serving measures
< 200 ml	± 5 %	- 0 + 10%
≥ 200 ml	± 5 ml + 2.5%	- 0 + 10 ml + 5%

(5) Materials

Capacity serving measures shall be made of material which is sufficiently rigid and dimensionally stable to maintain capacity within the MPE.

(6) Shape

(a) Transfer measures shall be designed so that a change of contents equal to the MPE causes a change in level of at least 2 mm at the brim or filling mark.

(b) Transfer measures shall be designed so that the complete discharge of the liquid being measured will not be impeded.

(7) Marking

(a) The nominal capacity declared shall be clearly and indelibly marked on the measure.

(b) Capacity serving measures may also be marked with up to three clearly distinguishable capacities, none of which shall lead to confusion one to the other.

(c) All filling marks shall be sufficiently clear and durable to ensure that MPE are not exceeded in use.

Part F U.K. Dimensional Measuring Instruments

54.  The relevant essential requirements of Part 1 and the specific requirements of this Part apply to dimensional measuring instruments. U.K.

Requirements common to all dimensional measuring instruments U.K.

55.—(1) Electromagnetic immunity

(2) The effect of an electromagnetic disturbance on a dimensional measuring instrument shall be such that—

(a) the change in measurement result is no greater than the critical change value as defined in paragraph (3); or

(b) it is impossible to perform any measurement; or

(c) there are momentary variations in the measurement result that cannot be interpreted, memorised or transmitted as a measuring result; or

(d) there are variations in the measurement result severe enough to be noticed by all those interested in the measurement result.

(3) The critical change value is equal to one scale interval.

Length measuring instruments U.K.

56.—(1) Characteristics of the product to be measured

(a) Textiles are characterised by the characteristic factor K. This factor takes the stretchability and force per unit area of the product measured into account and is defined by the following formula—

K = (G + 2.2 N/m²), where—

(i) is the relative elongation of a cloth specimen 1 m wide at a tensile force of 10 N;

(ii) G is the weight force per unit area of a cloth specimen in N/m².

(2) Operating conditions

(a) Range:

Dimensions and K-factor, where applicable, within the range specified by the manufacturer for the instrument. The ranges of K-factor are given in Table 21—

Table 21

Group	Range of K	Product
I	0 < K < 2 × 10-2 N/m2	low stretchability
II	2 x 10-2 N/m2 < K < 8 × 10-2 N/m2	medium stretchability
III	8 x 10-2 N/m 2 < K < 24 × 10-2 N/m2	high stretchability
IV	24 × 10-2 N/m2 < K	very high stretchability

(b) Where the measured object is not transported by the measuring instrument, its speed must be within the range specified by the manufacturer for the instrument.

(c) If the measurement result depends on the thickness, the surface condition and the kind of delivery (e.g. from a big roll or from a pile), corresponding limitations are specified by the manufacturer.

(3) MPE

(a) Instrument

Table 22

Accuracy class	MPE
I	0.125 %, but not less than 0.005 Lm
II	0.25 %, but not less than 0.01 Lm
III	0.5 %, but not less than 0.02 Lm

where L_m is the minimum measurable length, that is to say the smallest length specified by the manufacturer for which the instrument is intended to be used.

(b) The true length value of the different types of materials should be measured using suitable instruments (e.g. tapes of length). Thereby, the material which is going to be measured should be laid out on a suitable underlay (e.g. a suitable table) straight and unstretched.

(4) Other requirements

The instruments must ensure that the product is measured unstretched according to the intended stretchability for which the instrument is designed.

Area measuring instruments U.K.

57.—(1) Operating conditions

(a) Range

Dimensions within the range specified by the manufacturer for the instrument.

(b) Condition of the product

The manufacturer shall specify the limitations of the instruments due to the speed, and thickness of the surface conditions if relevant, of the product.

(2) MPE

58.  Instrument U.K.

The MPE is 1.0 % but not less than 1 dm².

Other requirements U.K.

59.—(1) Presentation of the product

In the case of pulling back or stopping the product, it should not be possible to have an error of measurement or the display must be blanked.

(2) Scale interval

The instruments must have a scale interval of 1.0 dm². In addition, it must be possible to have a scale interval of 0.1 dm² for testing purposes.

Multi-dimensional measuring instruments U.K.

60.—(1) Operating conditions

(a) Range

Dimensions within the range specified by the manufacturer for the instrument.

(b) Minimum dimension

The lower limit of the minimum dimension for all values of the scale interval is given in Table 23.

Table 23

Scale interval (d)	Minimum dimension (min) (lower limit)
d ≤ 2 cm	10 d
2 cm < d ≤ 10 cm	20 d
10 cm < d	50 d

(c) Speed of the product

The speed must be within the range specified by the manufacturer for the instrument.

(2) MPE

Instrument—

The MPE is ± 1.0 d.

Part G U.K. Volume Conversion Devices

61.  The relevant essential requirements of Part 1 and the specific requirements of this Part apply to volume conversion devices. U.K.

62.  A volume conversion device constitutes a sub-assembly for the purpose of these Regulations. U.K.

Rated operating conditions U.K.

63.  The manufacturer shall specify the rated operating conditions of the volume conversion device taking into account—

(a) the temperature range of the gas, with a minimum range of 40 °C;

(b) the volume conversion device shall be designed for the range of gases and supply pressures of the country of destination. In particular the manufacturer shall indicate—

(i) the gas family or group; and

(ii) the maximum operating pressure;

(c) a minimum temperature range of 50 °C for the climatic environment;

(d) the nominal value of the AC voltage supply and/or the limits of DC supply.

MPE U.K.

64.  The MPEs are—

(a) 0.5 % at ambient temperature 20 ° C ± 3 °C, ambient humidity 60 % ± 15 %, nominal values for power supply;

(b) 0.7 % for temperature conversion devices at rated operating conditions;

(c) 1 % for other conversion devices at rated operating conditions.

Note: The error of the gas meter is not taken into account.

Permissible effect of disturbances U.K.

65.—(1) Electromagnetic immunity

(2) The effect of an electromagnetic disturbance on a volume conversion device shall be such that—

(a) the change in the measurement result is no greater than the critical change value as defined in sub-paragraph (4), or

(b) the indication of the measurement result is such that it cannot be interpreted as a valid result, such as a momentary variation that cannot be interpreted, memorised or transmitted as a measuring result.

(3) After undergoing a disturbance, the volume conversion device shall—

(a) recover to operate within MPE, and

(b) have all measurement functions safeguarded, and

(c) allow recovery of all measurement data present just before the disturbance.

(4) The critical change value is the quantity corresponding to half of the magnitude of the relevant MPE as defined at paragraph 64.

Suitability U.K.

66.—(1) A volume conversion device powered from the mains (AC or DC) shall be provided with an emergency power supply device or other means to ensure, during a failure of the principal power source, that all measuring functions are safeguarded.

(2) A dedicated power source shall have a lifetime of at least five years. After 90% of its lifetime an appropriate warning shall be shown.

(3) An indicating device shall have a sufficient number of digits to ensure that the quantity passed during 8,000 hours at Q_max by the gas meter to which the volume conversion device is to be connected does not return the digits to their initial values.

(4) The volume conversion device shall be able to be installed to operate in any position declared by the manufacturer in its installation instruction.

(5) An electronic volume conversion device shall be capable of detecting when it is operating outside the operating range(s) stated by the manufacturer for parameters that are relevant for measurement accuracy. In such a case, the conversion device must stop integrating the converted quantity, and may totalise separately the converted quantity for the time it is operating outside the operating range(s).

(6) An electronic volume conversion device shall be capable of displaying all relevant data for the measurement without additional equipment.

Units U.K.

67.  Metered quantity shall be displayed in cubic metres or kilograms.

Base conditions for converted quantities U.K.

68.  The manufacturer shall specify the base conditions for converted quantities.

Putting into Use U.K.

69.  Any volume conversion device may be used in conjunction with any gas meter put into use in accordance with Annex MI-002 of the Directive.