Overview over rules and prescriptive expulsions to the acquisition a national admission to the verification


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Overview over rules and prescriptive expulsions to the acquisition a national admission to the verification

Physikalisch-Technische Bundesanstalt, national metrology institute of Germany, Section 7.6 “ Heat „, Dr. J. Rose

To the consumption-dependent bill of heating and warm water-expenses in the scope in accordance with § 1 of the Ordinance over „Heizkostenabrechnung – HeizkostenVerordnung“ – is necessarily stipulated their §§ 4 and 5 appliances to the recording of consumption /1/.

The duty to the standardization defines heat meters for the measuring instrument in the Law over the Measures – and Verification in the § 2 Abs.4 and §S 25 abbr.1 (Eichgesetz) finally altered the Second Law to the Alteration of the Medicine-Product-Law through article 7 – 2. MPG-ÄndG – from the 13. December 2001, BGBl. I S. 3586.

The general rules of the Eichordnung (EO-AV) of the 12. August 1988 (BGBl. I S. 1657) are applied to the measuring instruments of the admitted construction at present, finally altered the Second Law to the Alteration of the Medicine-Product-Law (2. MPG-ÄndG) through article 8 from the 13. December 2001 (BGBl). I S. 3586, including the installation

Anlage 22, finally altered through the 3. Ordinance to the Alteration of the EO of the 18. August 2000 (BGBl). I S. 1307, just as the Requests of the Physikalisch-Technische Bundesanstalt at measuring instruments for thermal energy PTB-A 22 (1 and 2), edition July 1988, finally altered in March 1996.

For the responsible authorities of the Federal German countries, guidelines became lawful to the standardization through the introduction of the administration rules – general regulations, Verwaltungsvorschriften Gesetzliches Messwesen GM – ARY, no. 108a of the 15. June 2002 as well as with the decisions to the execution of the rules of the lawful measurements (Kieler Sammlung, present stand: July 2003). For verification examinations is valid the Technische Richtlinie K7 (TR K7) for the rules of the technical, published from the PTB in the agreement with the authorities for verification, edition 1/91.

For the measurements at verifications of flow sensors with help of warm water the requirements acc. „Richtlinie für die Eichung von Volumenmessgeräten für strömendes Wasser und Anforderungen an Normale, Teil 3“ (iss. by the German „Arbeitsgemeinschaft Mess- und Eichwesen AG ME“ of 06./07.03 2001) are basis.

Platin-Resistancethermometers and Platin-Resistances become complementary on respects and establishings of the German industry norm Industrielle Platin-Wider-standsthermometer und Platin-Messwiderstände DIN EN 60751:1995 + A2:1995, edition July 1996 referred.

For construction-admissions can be done, on proposition of the petitioner, since accordingly 30.07.1998 additional or deviant requests the supplement of the installation 22 to the order of verification, „Ergänzung der Anlage 22 zur Eichordnung (Ziffer 6 ff.), publishes is put 108, 1998, no. 3, in the PTB-Mitteilungen at the base. The requests at the construction and error limits stand for heat meters on the basis of the product norm DIN EN 1434:1997 + A1:2002 (D), with what into the lawful measurements only selected sections of the parts 1 (General Requirements), 4 (Type Approval Tests), and 5 (Initial Verification Tests) was taken on. This national edition of the norm is the German translation of the current edition of the European Norm EN 1434, that under cooperation of the PTB Section 7.6 of the Technical Committee CEN / TC 176 “ Heat Meters“ was worked for and is.

In the state recognized „Prüfstellen für Messgeräte für Wärme“ for heat meters 2,473,000 heat meters and sub-assemblies become a initial verification annually – or subsequent verification as well as result-examination subjected.

The full-meeting for the German Eichwesen decided in her session at the 26. November 2003 that in the result of the evaluations from in the time period 2000 to 2004 undertaken extensive examinations at used heat meters / sub-assemblies in accordance with the technical guideline TR K 20 the validity of verification of 5 years and the error limits are confirmed. These statements are however still valid only under extrapolation of the establishings of the full-meeting 2000, the restrictions of standardizations in certain metrological classes has fixed. In the result of the establishings, the following fact-stand is now applied to the practice of verification timewise unlimited:

Mechanical flow sensors and Magnetic-Inductive for sub-assemblies will expose the classes B and C of Qn as well as qp in the metrology classes independently. After class A admitted sensors, 1:10 are restricted with the measurement range. For Ultrasonic-Sensors with Qn as well as qp < 3,5 m³/h it is abandoned the restrictions in the metrology class of C. Annulments of these restrictions are regulated in the type approval documents done by the PTB Section „Heat“ through acknowledgment of the results

– until now present examinations acc. TR K20 or

– from examinations to the measurement durability in accordance with digit 6.8 after DIN

EN 1434-4:1997 + A1:2002 (D)

(among others in the framework of durability test cycles done by the AGFW) or

– from spot-tests of examinations for heat meters to the extension of the validity of


The full-meeting for the German Eichwesen 2003 has agreed in her session about another supplement of the procedure to the spot-test of examinations of heat meters furthermore, (published in the PTB-Mitteilungen no.103, 1993, iss. 4, p. 340): For long temperature sensors, with L>70 mm, in layer-technology can – in supplement to the identical regulations for wire-wound temperature sensors (as well as rake-works PTB-Mitteilungen no. 112, 2002, iss. 4, p. 316) – the validity of verification through a spot-test procedure alternatively instead of 3 years now about 5 years be extended, if the single error limit valid in each case is applied as spot-test error limit.

Modern time heat meters are software-controlled. To these measuring instruments, the new requirements PTB-A 50.7 are applied from 01.06.2002 „Requests at electronic and software-controlled measuring instruments and addition-facilities for electricity, gas, water and heat“. At his development the PTB Section „Heat“ was actively involved 7.6. These requirements are applied to measuring instruments in the lawful verification with relevant, complex addition-functions and are the national transposition in conformity to the WELMEC Guide 7.1. Background of the development of these requests is that the conformity explanation necessary in the framework of the Measuring Instrument Directive (MID) to the first put-into-use on the European community-market is handed over only for reason-functions defined in the MID. In the future, a national admission-seal is installed additionally after the set of the MID beside the conformity-labeling on appliances with complex addition-functions.

European Measurement Instrument Directive (MID)

In the appendixes of the MID, that means The Essential Requirements and annex MI-004, Specific Requirements are organized requests, error limits and referrals on test programs technically – as regards content on OIML-Recommendations and European product-standards, for heat meters and their sub-assemblies consequently on the OIML R 75 as well as EN 1434, at present heat-bearers exclusively water. Heat meters become after choices of the manufacturers after the modules B + F or B + D or H1 respects to the conformity assesses. The PTB Section „Heat“ is involved through active cooperations in the inner PTB-working party H1 with developments of regulations. For technical details of the heat meter he represents the stand of the PTB in cooperation with other national metrology institutes as well as with the first notified bodies in the sense to make uniform procedures.

International guideline for heat meters

Complementary to the composition of measuring guidlines is reminded on the international guideline revised in the year 2002 for the construction of heat meters done by the International Organization of Metrology (OIML, office Paris) from the project P1, the Technical Committee TC 11. The OIML Recommendation R 75 (heat meter) has got harmonizations of requests, error limits and instructions for verification current world-wide for orientations. In the historic development, her predecessor gave the presentation for the first national requests at the construction. For example the PTB Section 7.6 is tied in into this work for years and brought in the Draft of part 3 of the International Recommendation OIML R 75 (Heat meter). At the moment he processes the comments of the member states. [/toggle]