Rs 941.241 Order Of Fdjp's March 19, 2006, On The Quantities Of Gas Measuring Instruments

Original Language Title: RS 941.241 Ordonnance du DFJP du 19 mars 2006 sur les instruments de mesure de quantités de gaz

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941.241 order of FDJP on instruments for measuring quantities of gas from March 19, 2006 (State 1 January 2013) the federal Department of justice and police (FDJP), having regard to the art. 5, al. 2, 8, al. 2, 11, al. 2, 24, al. 3, and 33 of the Ordinance of 15 February 2006 on measuring instruments (Ordinance on measuring instruments), stop: art. 1 purpose this fixed order: a. the requirements relating to the quantities of gas measuring instruments; b. the procedures for placing on the market of these measuring instruments; c. procedures to maintain the stability of these measuring instruments measurement.

S. 2 scope this order applies to measuring instruments for measuring the quantities of gas which are used in medium residential, commercial or light industrial.

S. 3 definitions for the purposes of this order, means: a. gas meter: an instrument designed to measure, memorise and display the quantity of gas (volume or mass) fuel passing by him; b. conversion device: a device fitted to a gas meter that works independently and that automatically converts the quantity measured under the conditions of measurement in a quantity in the basic conditions.

S. 4 reference conditions the reference conditions (basic conditions) for the determination of quantities of gas are: a. pressure 101 325 Pa;

b. temperature 273.15 K.

S. 5 accuracy allowed measurements to residential use in class, the counters class 1,5 or class 1.0 with a report Qmax/Qmin equal or greater than 150 are admitted.
During measurements to commercial or light industrial use, all meters class 1.5 or 1.0 are permitted.

S. 6 essential requirements quantities of gas measuring instruments must meet the essential requirements laid down in Schedule 1 of the Ordinance on measuring instruments and in the annex to this order.

S. 7 procedures for placing on the market the conformity of measuring instruments for gases with the essential requirements mentioned in art. 6 can be evaluated and certified at the choice of the manufacturer according to one of the following procedures laid down in annex 2 of the Ordinance on measuring instruments: a. type-examination (module B) supplemented by the declaration of conformity to type on the basis of an audit of the product (module F); b. type examination (module B) supplemented by the declaration of conformity to type based on the assurance of the quality of the manufacturing process (module D); c. declaration of compliance on the basis of insurance comprehensive quality and an examination of the design (module H1).

S. 8 procedures for maintaining stability of measurement quantities of gas measuring instruments are subject to later verification according to annex 7, c. 1, of the Ordinance on the measuring instruments, performed by a verification laboratory authorized.
Subsequent verification of the instruments for measuring quantities of gas mentioned below should occur: a. all fourteen years for meters with deformable walls; b. all eleven years for meters with rotary pistons; c. every six years for meters turbine and turbulence, as well as for the ultrasonic meters or any other new measuring principle; d. every two years for conversion devices.

The subsequent verification shall take place every two years for all other quantities of gas measuring instruments. The federal Office of Metrology (federal office) may extend the period of validity of the verification up to three years permitting the construction of the measuring instrument and the possibilities of user control.

S. 9 obligations of the user the user the responsibility specified in art. 21, al. 1, of the Ordinance on measuring instruments, but also that: a. to enforce the manufacturer's instructions for mounting and commissioning of the measuring instrument and to ensure that persons responsible for the mounting have skills necessary; b. to maintain the instrument in good condition and to periodically review the parts subject to wear Aging or contamination.

S. 10 control register users maintain a register of measuring instruments used in their field of activity.
Registry must indicate for each measuring instrument: a. when and under what procedure it has been placed on the market; b. when maintaining stability of measurement procedure is prescribed; c. when the maintenance of stability of measurement procedure has been applied for the last time; d. where it is in service.

Concerned gas consumers and the bodies responsible for the implementation of this order may consult the register at any time.
In case of disagreement, the federal agency decides if the records meet the requirements.

S. 11 maximum permissible errors during checks the applicable maximum permissible errors during challenge results of measures within the meaning of art. 29, al. 1, of the Ordinance on instruments of measurement or when the official control of a measuring instrument done outside the audit are twice the maximum permissible errors for the complete gas measuring instruments laid down in the annex to this order.

S. 12 the law in force the order of August 4, 1986, on the quantities of gas measuring instruments is repealed.

[1986 1491 RO]

S. 13 transitional instruments for measuring quantities of gas checked before the entry into force of this order may continue to be checked later. On the subsequent verification, they must comply with the maximum errors permissible in accordance with the previous provisions.
The quantities of gas measuring instruments that have been approved under previous law may be placed on the market and initially verified according to annex 5, ch. 2, of the Ordinance on measuring instruments for ten years from the entry into force of this order. After the expiry of those ten years, they may still be checked subsequently.

S. 14 entry into force this order comes into force on October 30, 2006.

Annex (art. 6) specific requirements relating to the quantities of gas A Definitions minimum flowrate (Qmin) measuring instruments: the lower rate at which the gas meter provides indications that satisfy the requirements relating to the maximum permissible errors (MPES).

Maximum flowrate (Qmax): the highest flowrate at which the gas meter provides indications that satisfy the requirements regarding MPE.

Transitional flowrate (Qt): flow between the maximum 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.

Overload flowrate (Qr): rate the highest at which the meter operates for a short period of time without deteriorating.

Basic conditions: specified conditions to which the measured quantity of combustible gas is converted.

B metrological requirements relating to gas meters 1 nominal operating Conditions the manufacturer shall specify the rated operating conditions of the gas meter, so, it must take account of the following: 1.1 the scope of gas flow must at least meet the following conditions: table 1 class Qmax/Qmin Qmax/Qt Qr/Qmax 1.5 ³ 150 ³ 10 1.2 1.0 ³ 20 ³ 5 1.2 1.2 the scope of gas temperature It is at least 40 ° C.1.3 Conditions relating to gas combustiblesLe gas meter shall be designed for the range of gases and pressures of power of the country of destination. The manufacturer must indicate: - the family or gas group; - the maximum operating pressure.

1.4 one specifies at least 50 ° C environment climatique.1.5 the nominal value of supply current alternative and/or limits the power current DC.

2 EMT 2.1 gas meter indicating the volume at metering conditions or mass table 2 class 1.5 1.0 Qmin ≤Q ≤Qt 3% 2% Qt ≤Q ≤Qmax 1.5% 1% when the errors between Qt and Qmax all have the same sign, they shall not exceed 1% for class 1,5 and 0,5% for class 1,0.
2.2 in the case of a counter with conversion device temperature indicating only the converted volume, the MPE of the meter is increased by 0,5% in a range of 30 ° C extending systematically share and other temperature specified by the manufacturer that lies between 15 ° C and 25 ° C. Outside this range, an additional increase of 0.5% is permitted for each 10 ° C range.

3 allowable effects of disturbances 3.1 immunity electromagnetique3.1.1 the effect of an EMI on a gas meter or a conversion device shall be such:-that the variation of the measurement result is greater than the critical change value laid down in clause 3.1.3 or - that the indication of the measurement result is done in such a way that it can not be interpreted as a valid result as is the case during a momentary variation, stored in memory or transmitted as a measuring result.

3.1.2 after undergoing an electromagnetic disturbance, the gas meter shall: - recover to operate within MPE; - safeguard all measuring functions, and - recover all measurement data present just before the disturbance.

3.1.3 the critical change value is the smaller of the following values:

-the quantity corresponding to half of the MPE in the upper zone of the measured quantity; - the quantity corresponding to the MPE on the quantity corresponding to one minute at the maximum flowrate.

3.2 effect of disturbances of the flow upstream and avalDans the installation conditions specified by the manufacturer, the effect of the flow disturbances shall not exceed one-third of the MPE.

4 sustainability after an adequate trial has been carried out taking into account a period estimated by the manufacturer, the following criteria must be met: 4.1 the class meters 1,54.1.1 after the durability test, the variation of the measurement result compared with the initial measurement result for the flow rates in the range Qt to Qmax must not exceed the result of measuring over 2%. 4.1.2 the error of indication after the durability test shall not exceed twice the EMT in ch. 2.4.2 class 1,04.2.1 meters after the durability test, the variation of the measurement result compared with the initial measurement result must not be greater than one-third of the MPE laid down in ch. 2.4.2.2 the error of indication after the durability test should not exceed the MPE laid down in Chapter 2.

5 fitness 5.1 a gas meter powered from the mains (alternating or direct current) must be equipped with an emergency power supply device or other means ensuring the safeguarding of all measuring functions during a failure of the power supply electric principale.5.2 an autonomous power supply must have a lifetime of at least five years. After 90% of its lifetime an appropriate warning shall be affiche.5.3 an indicating device shall have a sufficient number of digits so the amount passing during 8000 hours at Qmax does not reduce figures to their values initiales.5.4 the gas meter must be able to be installed so that it can operate in any position declared by the manufacturer in its instructions for installation.5.5 the gas meter must include a component of test which allows to perform tests within one raisonnable.5.6 the gas meter shall respect the MPE regardless of the direction of the stream, or only in the direction of flow when it is clearly indicated.

6 units metered quantity shall be displayed in m or kg.

C conversion devices for metrological requirements essential requirements for gas meters are also to conversion devices if they are relevant. They must also satisfy the following requirements: 1 Basic Conditions for converted quantities the manufacturer shall specify the basic conditions for converted quantities.

2 EMT - 0.5% at an ambient temperature of 20 ° C ± 3 ° C, ambient humidity 60% ± 15%, nominal values for power supply;
-0.7% for conversion devices depending on the temperature in the conditions of operation nominal; - 1% for other conversion in nominal operating conditions devices.

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

3 adequacy 3.1 an electronic conversion device shall be capable of detecting an operating outside the operating range specified by the manufacturer for parameters that are important for the accuracy of measurement. In this case, the conversion device must stop integrating the converted quantity and can be totaled separately the size converted during the time where it is outside the range of fonctionnement.3.2 an electronic conversion device shall be capable to display all relevant data for the measurement without additional equipment.

State on January 1, 2013

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