R137/2012-A-NL1-20.10 Rev. 10
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-20.10 revision 10 Project number 3874399 Page 1 of 7
Issuing authority
NMi Certin B.V.
Person responsible: M.Ph.D. Schmidt
Applicant and Manufacturer
MeteRSit Viale dell'Industria,34 35129 Padova Italy
Identification of the certified type
A thermal-mass flow gas meter Type: x485xxx
Characteristics
See following page(s)
This OIML Certificate is issued under scheme A.
This Certificate attests the conformity of the above identified type (represented by the sample(s) identified in the OIML Type Evaluation Report) with the requirements of the following Recommendation of the International Organization of Legal Metrology (OIML):
R 137-1:2012 "Gas meters"
Accuracy class
This Certificate relates only to the metrological and technical characteristics of the type of measuring instrument covered by the relevant OIML International Recommendation identified above. This Certificate does not bestow any form of legal international approval.
This certificate and supporting reports comply with the requirements of OIML-CS-PD-07 clause 6.2.
Important note: Apart from the mention of the Certificate's reference number and the name of the OIML Member State in which the Certificate was issued, partial quotation of the Certificate and of the associated OIML Type Evaluation Report(s) is not permitted, although either may be reproduced in full.
Issuing Authority
NMi Certin B.V., OIML Issuing Authority NL1 4 February 2025
Certification Board
This document is issued under the provision that no liability is accepted and that the applicant shall indemnify third-party liability.
OIML Certificate
Number R137/2012-A-NL1-20.10 revision 10 Project number 3874399 Page 2 of 7
The conformity was established by the results of tests and examinations provided in the associated report(s):
No. NMi-15200299-02 dated 15 March 2016 that includes 45 pages;
No. NMi-16200387-02 dated 17 October 2016 that includes 61 pages.
No. NMi-SO16204082-01 dated 10 November 2016 that includes 15 pages;
No. NMi-16200852-01 dated 8 May 2017 that includes 13 pages;
No. NMi-1901756-02 dated 23 March 2018 that includes 12 pages;
No. NMi-1900623-02 dated 29 May 2017 that includes 17 pages;
No. NMi-1901029-02 dated 11 October 2017 that includes 14 pages;
No. NMi-1901403-02 dated 1 February 2018 that includes 21 pages;
No. NMi-1902208-02 dated 25 July 2018 that includes 14 pages;
No. NMi-2268368-02 dated 6 December 2018 that includes 10 pages;
No. NMi-2327085-02 dated 13 June 2019 that includes 3 pages;
No. NMi-1902287-02 dated 17 February 2020 that includes 18 pages;
No. NMi-2188742-02 dated 3 June 2020 that includes 16 pages;
No. NMi-2364857-02 dated 23 November 2020 that includes 26 pages;
No. NMi-2477858-02 dated 2 April 2021 that includes 19 pages;
No. NMi-2548615-01 dated 1 July 2021 that includes 17 pages;
No. NMi-2587901-02 dated 7 October 2021 that includes 16 pages;
No. NMi-2893273-02 dated 10 February 2022 includes 16 pages;
No. NMi-3093042-02 dated 10 February 2022 that includes 13 pages;
No. NMi-3476264-01 dated 3 May 2022 that includes 12 pages;
No. NMi-3543194-02 dated 28 July 2023 that includes 15 pages;
No. NMi-3766785-01 dated 3 September 2024 that includes 31 pages;
No. NMi-3777055-01 dated 3 October 2024 that includes 29 pages;
No. NMi-3874399-01 dated 4 February 2025 that includes 19 pages.
Characteristics of the measuring instrument
In Table 1 the general characteristics of the measuring instrument are presented. In Table 2 the software versions and associated checksums are presented. In Table 3 and 4 the characteristics of the family of instruments are presented. The construction of the measuring instrument is recorded in the Documentation folder no. T10362-56.
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-20.10 revision 10
Project number 3874399
Page 3 of 7
Table 1 General characteristics
| Destined for the measurement of | Gas volume of natural gas, type H or L or Gas volume of natural gas, type H, L and E, with a Gross Wobbe Index between 39,1 MJ/m3 and 54,7 MJ/m3 at 15℃ and 1,01325 bar, including mixtures with a hydrogen concentration of up to 23% by volume. |
| Environmental classes | M1/E2 |
| Accuracy class | 1.5 |
| Maximum pressure | 500 mbar |
| Ambient temperature range | -25-+55℃ |
| Gas temperature range | -25-+55℃ |
| Designed for | Condensing humidity |
| Orientation | Horizontal |
| Power supply voltage | Battery powered |
Table 2 Software identification
| Software identification | Version number | Checksum | Meter size |
| EL10 | ADB2 | G1.6 | |
| EL40 | A7345A73 | G2.5 | |
| EL40 | 3F8C0F42 | G4 extended | |
| EL10 | ADB2 | G4MMU6 | |
| E132 | 03EF | ||
| E167 | D029 | ||
| G182 | A1A8 | ||
| G192 | 18FB | ||
| G193 | 03B6 | ||
| G194 | 1CCF | ||
| GL01 | 5812 | ||
| GL10 | 8096 | ||
| GL10 | 1FA8 | ||
| I192 | 8F41 | ||
| GL20 | 1B98163C | ||
| GL20 | E06D5DC3 | ||
| GL20 | 8EE0A289 | ||
| GL40 | 8AAEF5ED | ||
| GL40 | 9658D989 |
OIML Member State The Netherlands
OIML Certificate
Number R137/2012-A-NL1-20.10 revision 10
Project number 3874399
Page 4 of 7
| GL45 GL45 | 8C4516C6 423BE916 | |
| GL26 | 923DD39B | G4 MMU6 dot display |
| A132 A167 J182 J192 J193 J194 JL01 JL10 L192 JL40 JL40 | CA53 7199 BDC1 3484 4586 5FFA B0DE 7EEA D8DD A7BCEB12 568CB31F | G6 |
| B166 B183 B192 B194 BL01 BL10 BL40 BL80 BL80 | 6CA4 82D8 B8EF 22FA BD57 4175 AE0F5A61 A29F2615 228C7D05 | G10 MMU16 |
| C182 C192 C194 CL01 CL10 CL11 F154 F166 CL13 CL40 | C9BE BC94 F780 62F5 B51F F7E8 E336 7D4C D1DD9B83 306988F6 | G16 MMU25 |
| D182 D192 D194 DL01 DL10 DL11 H154 H166 DL13 DL40 | E589 E889 416D CBFE 38FA 3EF9 6B95 F29E 050A7042 52840ABD | G25 MMU40 |
| ML38 | D38DC219 | G40 |
OIML Member State The Netherlands
OIML Certificate
Number R137/2012-A-NL1-20.10 revision 10 Project number 3874399
Page 5 of 7
| MMU-Hydrogen | DH25 | 35A7CF47 | MMU40 |
| GH25 | 6B004CFA | MMU6 | |
| Metrology processing software | EL30 | 3CA2E7AF | G1.6G2.5G4 extended |
| EL31 | FCCC0334 | ||
| EL32 | 98ED4B7A | ||
| EL37 | DAE8303A | ||
| GL30 | 457E70AC | G4 | |
| GL31 | 7B3F312A | ||
| GL32 | 2044FB12 | ||
| GL35 | A1919F0B | ||
| Bootloader | JL30 | 917875FB | G6 |
| JL31 | 9F7F23C6 | ||
| JL32 | 1D9A869B | ||
| Bootloader | O430 | 375B8BF8 | GPRS |
| O431 | C6ECD32B | NB-IoT | |
| U530 | CD16D523 | WMBUS | |
| W530 | CD16D523 | Walk-By |
Table 3 General characteristics of the family of instruments
| Meter size | G1.6 | G2.5 | G4MMU6 | G4 ext. | G6 |
| Minimum flow rate $Q_{\mathrm{min}}$(m3/h) | 0,016 | 0,025 | 0,04 | 0,016 | 0,06 |
| Transitional flow rate $Q_{\mathrm{t}}$(m3/h) | 0,25 | 0,4 | 0,6 | 0,25 | 1 |
| Maximum flow rate $Q_{\mathrm{max}}$(m3/h) | 2,5 | 4 | 6 | 6 | 10 |
| Overload flow rate $Q_{\mathrm{r}}$(m3/h) | 3 | 4,8 | 7,2 | 7,2 | 12 |
| Indicating range(m3) | 99999 or 999999 | ||||
| Verification scale interval(m3) | 0,001 | ||||
| Nominal diameter[mm] | 19 or32 | 32 | |||
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-20.10 revision 10 Project number 3874399
Page 6 of 7
Table 4 General characteristics of the family of instruments
| Meter size | G10MMU16 | G16MMU25 | G25MMU40 | G40 |
| Minimum flow rate $ Q_{\min} $ (m3/h) | 0,1 | 0,16 | 0,25 | 0,4 |
| Transitional flow rate $ Q_{t} $ (m3/h) | 1,6 | 2,5 | 4 | 6,5 |
| Maximum flow rate $ Q_{\max} $ (m3/h) | 16 | 25 | 40 | 65 |
| Overload flow rate $ Q_{r} $ (m3/h) | 19,2 | 30 | 48 | 78 |
| Indicating range (m3) | 999999 | |||
| Verification scale interval (m3) | 0,001 | |||
| Nominal diameter [mm] | 1 1/4" BS746or 50 | 65 | Flange type02 PN16 DN65 | |
Certificate history:
This revision replaces the previous versions.
| Revision | Date | Description of the modification |
| Initial | - | |
| 1 | 27 November 2020 | Addition of report No. NMi-2364857-02 and software update |
| 2 | 7 October 2021 | Addition of meter types using SGM63xx measurement sensor Software updates |
| 3 | 11 February 2022 | Addition of reports No. NMi-2893273-02 and NMi-3093042-02 for revised PCBs. |
| 4 | 3 May 2022 | Addition of G1.6 version with SGM6101 Software update |
| 5 | 6 October 202228 July 2023 | Addition of new housing for MMU6/Software versions addedAddition of pulse output battery cover for G10,G16,G25,MMU25 and MMU40 models. |
| 6 | 22 November 2022 | New combined communication versionSoftware update |
| 7 | 21 August 2023 | Correction of typo in revision number |
OIML Member State The Netherlands
OIML Certificate
Number R137/2012-A-NL1-20.10 revision 10
Project number 3874399
Page 7 of 7
| Revision | Date | Description of the modification |
| 8 | 11 September 2024 | Dot display MMU6, new pcb and software version |
| 9 | 3 October 2024 | Addition of G40 with parallel SGM6325 sensors. These sensors are fitting in a new housing with new sealing and use a new software version. |
| 10 | 4 February 2025 | Addition of a G10/MMU16 version which contains 2 parallel SGM6306 sensors instead of a singular SGM6104 sensor. These sensors are fitted in a standard MMU6 housing with 1 1/4” BS746 connections and a new connector to the index. |