941.241
DFJP Ordinance on Gas Quantities Measurement Instruments
19 March 2006 (State 1 Er January 2013)
Federal Department of Justice and Police (DFJP),
Having regard to art. 5, para. 2, 8, para. 2, 11, para. 2, 24, para. 3, and 33 of the order of 15 February 2006 on measuring instruments (Ordinance on measuring instruments) 1 , 2
Stops:
This Order fixes:
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A.
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The requirements for measuring quantities of gas;
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B.
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The procedures for placing these measuring instruments on the market;
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C.
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Procedures to maintain the stability of measurement of these measuring instruments.
This order applies to measuring instruments intended to measure quantities of fuel gas that are used in a light residential, commercial or industrial environment.
For the purposes of this order:
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A.
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Gas meter: An instrument designed to measure, store and display the amount of fuel gas (volume or mass) passing through it;
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B.
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Conversion device: A device mounted on a gas meter that operates independently and automatically converts the measured quantity into the measurement conditions in a quantity under the basic conditions.
The reference conditions (basic conditions) for the determination of quantities of gas are:
|
A. |
Pressure |
101 325 Pa; |
|
B. |
Temperature |
273.15 K. |
1 When measuring for residential use, meters in class 1.5, or Class 1.0 having a report Q Max /Q Min Equal to or greater than 150 are allowed.
2 In commercial or light industrial measurement, all meters in class 1.5 or 1.0 are allowed.
Gas measuring instruments shall meet the essential requirements set out in Schedule 1 of the Ordinance on Measuring Instruments and the Schedule to this Order.
The conformity of the measuring instruments of gas quantities with the essential requirements referred to in Art. 6 may be evaluated and certified at the manufacturer's choice in accordance with one of the following procedures set out in Schedule 2 of the Ordinance on Measuring Instruments:
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A.
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Type examination (module B) completed by the declaration of conformity to the type on the basis of a product verification (module F);
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B.
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Type examination (module B) completed by the declaration of conformity to the type on the basis of quality assurance of the manufacturing process (module D);
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C.
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Declaration of conformity on the basis of comprehensive quality assurance and design control (module H1).
1 The instruments for measuring quantities of gas shall be subject to the subsequent verification in accordance with Annex 7, c. 1, of the order on measuring instruments, carried out by an authorized verification laboratory.
2 Subsequent verification of the following quantities of gas measuring instruments shall be carried out:
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A.
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Every fourteen years for diaphragm meters;
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B.
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Every eleven years for rotary meters;
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C.
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Every six years for turbine and turbulence meters, as well as for ultrasonic meters or other new measurement principles;
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D.
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Every two years for conversion devices.
3 The subsequent verification shall take place every two years for all other instruments for measuring quantities of gas. The Federal Office of Metrology (Federal Office) may extend the validity of the audit for up to three years if the construction of the measuring instrument and the user's control possibilities permit.
The user assumes the responsibility specified in s. 21, para. 1, of the order on measuring instruments, but also the order:
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A.
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To ensure compliance with the manufacturer's instructions for the assembly and commissioning of the measuring instrument and to ensure that the persons responsible for the assembly have the necessary skills;
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B.
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Maintain the measuring instrument in good condition and periodically review the parts subject to wear, aging or fouling.
1 Users maintain a control log of the measurement instruments used in their field of activity.
2 The register shall specify for each measuring instrument:
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A.
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When and according to what procedure it has been placed on the market;
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B.
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The procedure for maintaining measurement stability is prescribed;
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C.
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When the maintenance of measurement stability procedure was last applied;
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D.
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Where it is in service.
3 The gas consumers concerned and the bodies responsible for the enforcement of this order may consult the register at any time.
4 In case of disagreement, the Federal Office shall decide whether the registers meet the requirements.
The maximum permissible errors applicable in the challenge of results of measures within the meaning of Art. 29, para. 1, of the order on measuring instruments or in the official control of an instrument of measurement carried out outside the verification are the double of the maximum permissible errors for the instruments of measuring the quantities of complete gas fixed To the schedule to this order.
The order of 4 August 1986 on instruments for measuring quantities of gas 1 Is repealed.
1 Quantities of gas measured prior to the coming into force of this order may continue to be verified at a later date. At the time of the subsequent verification, they must comply with the maximum tolerated errors in accordance with the previous provisions.
2 The instruments for measuring quantities of gas that have been approved under the earlier right may be placed on the market and verified initially according to Annex 5, c. 2, of the order on instruments of measurement for ten years from the coming into force of this order. After the expiry of these ten years, they may still be verified at a later date.
This Order comes into force on October 30, 2006.
(art. 6)
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Minimum Rate (Q Min ): The lowest flow rate at which the gas meter provides indications that meet the Maximum Tolerated Error (TRM) requirements.
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Maximum rate (Q Max ): The highest rate at which the gas meter provides indications that meet the requirements for LEMs.
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Transition Rate (Q T ): The flow rate between the maximum and minimum flow rates, to which the flow is divided into two zones, the "upper zone" and the "lower zone", each zone having a characteristic EMT.
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Overload rate (Q R ): The highest rate at which the meter operates for a short period of time without deterioration.
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Basic conditions: Specified conditions to which the quantity of the measured fuel gas is converted.
| 1 |
Nominal Operating Conditions |
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The manufacturer must specify the nominal operating conditions of the gas meter, in order to do so, it must take into account the following:
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1.1
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The flow rate of the gas shall meet at least the following conditions:
Table 1
|
Class |
Q Max /Q Min |
Q Max /Q T |
Q R /Q Max |
|
1.5 |
³ 150 |
³ 10 |
1.2 |
|
1.0 |
³ 20 |
³ 5 |
1.2 |
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|
|
|
|
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1.2
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The temperature range of the gas is at least 40 ° C.
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1.3
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Conditions for fuel gas
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The gas meter shall be designed for the range of gases and supply pressures of the country of destination. The manufacturer shall include in particular:
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The family or gas group;
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Maximum operating pressure.
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1.4
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A temperature range of at least 50 ° C for the climate environment.
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1.5
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The nominal value of AC power and/or dc power limits.
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2.1
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Gas meter indicating volume to measurement conditions or mass
Table 2
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Class |
1.5 |
1.0 |
|
Q Min ≤Q ≤Q T |
3 % |
2 % |
|
Q T ≤Q ≤Q Max |
1.5 % |
1 % |
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|
|
|
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When errors between Q T And Q Max Have the same sign, they must not exceed 1 % for class 1.5 and 0.5 % for class 1.0.
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2.2
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In the case of a meter with temperature conversion device which indicates only the converted volume, the meter EMT shall be increased by 0.5 % in a range of 30 ° C systematically extending from both sides of the specified temperature By the manufacturer between 15 ° C and 25 ° C. Outside this range, an additional increase of 0.5 % is allowed for each 10 ° C interval.
| 3 |
Eligible Effect of Disturbances |
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3.1
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Electromagnetic immunity
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3.1.1
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The effect of electromagnetic disturbance on a gas meter or conversion device shall be such:
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That the variation of the measurement result is greater than the critical variation value defined in the c. 3.1.3, or
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That the indication of the result of the measurement is done in such a way that it cannot be interpreted as a valid result, as is the case during a momentary variation, put into memory or transmitted as a measurement result.
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3.1.2
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After an electromagnetic disturbance, the gas meter shall:
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Be able to operate within EMT limits;
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Save all metering functions, and
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To recover all measurement data present just prior to the disturbance.
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3.1.3
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The critical variation value is the smallest of the following values:
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The quantity corresponding to half of the EMT in the upper zone of the measured quantity;
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The quantity corresponding to the EMT applied to the quantity corresponding to one minute at the maximum flow rate.
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3.2
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Effect of upstream and downstream flow disturbances
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In the installation conditions specified by the manufacturer, the effect of flow disturbances shall not exceed one third of the EMT.
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After an adequate test has been carried out taking into account a period estimated by the manufacturer, the following criteria must be met:
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4.1
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Class 1.5 Meters
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4.1.1
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After the durability test, the variation of the result of the measurement in relation to the result of the initial measurement for the flows in the range Q T To Q Max Shall not exceed the result of the measurement of more than 2 %.
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4.1.2
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The error of indication after the durability test shall not exceed the double of the EMT provided for in the c. 2.
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4.2
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Class 1.0 Meters
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4.2.1
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After the durability test, the variation of the measurement result in relation to the initial measurement result shall not exceed one third of the EMT provided for in the c. 2.
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4.2.2
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The error of indication after the durability test shall not exceed the EMT provided for in the c. 2.
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5.1
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A gas meter supplied by the sector (alternating current or continuous current) shall be equipped with a back-up power supply or other means ensuring the safety of all the measuring functions during a failure of the Primary power source.
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5.2
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A stand-alone energy source must have a life span of at least five years. After 90 % of its life, an appropriate warning must be displayed.
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5.3
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An indicator device must have a sufficient number of digits to allow the quantity to flow for 8000 hours to Q Max Does not bring the numbers back to their original values.
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5.4
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The gas meter shall be capable of being installed in such a way that it can operate in any position declared by the manufacturer in its installation instructions.
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5.5
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The gas meter shall have a test element which allows for testing within a reasonable period of time.
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5.6
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The gas meter shall respect the EMT regardless of the direction of the flow, or only in the direction of the flow when clearly indicated.
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The measured quantity must be displayed in m 3 Or in kg.
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The essential requirements for gas meters are also applicable to conversion devices if they are relevant. They must also meet the following requirements:
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| 1 |
Basic conditions for converted quantities |
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The manufacturer must specify the basic conditions for the quantities converted.
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0.5 % at an ambient temperature of 20 ° C ± 3 ° C, an ambient humidity of 60 % ± 15 %, to the nominal values of the electrical supply;
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0.7 % for temperature conversion devices under nominal operating conditions;
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1 % for other conversion devices under nominal operating conditions.
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The gas meter error is not taken into account.
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3.1
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An electronic conversion device shall be capable of detecting an operation outside the operating range (s) indicated by the manufacturer for the parameters that are important for measurement accuracy. In this case, the conversion device must stop integrating the converted size and can aggregate the converted size separately during the time it is outside the operating range (s).
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3.2
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An electronic conversion device shall be capable of displaying all relevant data for measurement without additional equipment.
State 1 Er January 2013
