INTERNATIONAL OIML R 137-1 2 RECOMMENDATION
INTERNATIONAL
OIML R 137-1 & 2
RECOMMENDATION
Edition 2012 (E)
Including Amendment 2014
Gas meters
Part 1: Metrological and technical requirements Part 2: Metrological controls and performance tests
Compteurs de gaz Partie 1: Exigences m?trologiques et techniques Partie 2: Contr?les m?trologiques et essais de performance
OIML R 137-1 & 2 Edition 2012 (E)
ORGANISATION INTERNATIONALE DE M?TROLOGIE L?GALE
INTERNATIONAL ORGANIZATION OF LEGAL METROLOGY
INTERNATIONAL RECOMMENDATION
Amendment 2014 to OIML R 137-1 & 2
Edition 2012 (E)
Gas meters
Part 1: Metrological and technical requirements Part 2: Metrological controls and performance tests
Compteurs de gaz Partie 1: Exigences m?trologiques et techniques Partie 2: Contr?les m?trologiques et essais de performance
Amendment 2014 to OIML R 137-1 & 2 Edition 2012 (E)
ORGANISATION INTERNATIONALE DE M?TROLOGIE L?GALE
INTERNATIONAL ORGANIZATION OF LEGAL METROLOGY
Amendment (2014) to OIML R 137-1 & -2 (2012)
12.5
TYPE EVALUATION PROCEDURES
12.5.1 Software evaluation
The software evaluation procedure concerns evaluation of compliance to the requirements as described in part 2 Annex I and comprises a combination of analysis and validation methods and tests as shown in Table 6. The explanation of the abbreviations used and the relation to the methods as described in detail in OIML D 31 is shown in Table 7.
Table 1 Software validation procedures applicable for verification of compliance
I.1.1 I.1.2 I.1.3
I.2.1 I.2.2 I.2.3 I.2.3.1 I.2.4 I.2.3.4 I.2.3.5
Requirement Software identification Correctness of algorithms Fraud protection Parameter protection Separation of electronic devices and sub-assemblies Separation of software parts Storage of data, transmission via communication systems Data protection with respect to time of measurement Automatic storage Transmission delay Transmission interruption Time stamp
Evaluation procedure AD + VFTSw AD + VFTSw AD + VFTSw + DFA/CIWT/SMT1 AD + VFTSw + DFA/CIWT/SMT1 AD AD AD + VFTSw + CIWT/SMT1 AD + VFTSw + SMT1 AD + VFTSw AD + VFTSw AD + VFTSw AD + VFTSw
Table 2 Cross references of evaluation procedures to those described in Annex E
Abbreviation
Description
AD
VFTM
VFTSw DFA1 CIWT1 SMT1
Analysis of the documentation and validation of the design
Validation by functional testing of metrological functions
Validation by functional testing of software functions
Metrological data flow analysis
Code inspection and walkthrough
Software module testing
Related Annex E and OIML D 31:2008 Clause Annex E (E1) D 31 (6.3.2.1)
Annex E (E2) D 31 (6.3.2.2)
Annex E (E3) D 31 (6.3.2.3) Annex E (E4) D 31 (6.3.2.4) Annex E (E5) D 31 (6.3.2.5) Annex E (E6) D 31 (6.3.2.6)
1) If one of the three cases below applies, the execution of the evaluation methods DFA, CIWT and SMT is not necessary:
Case 1: no data transmission interface is incorporated in the gas meter, or
Case 2: a transmission interface is incorporated but only provides measurement data output from the gas meter, or
Case 3: no transmission of measurement data in open systems is possible.
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