R137/2012-A-NL1-20.07 Rev. 5

OIML Member State The Netherlands

Number R137/2012-A-NL1-20.07 revision 5 Project number 3937886 Page 1 of 6

Issuing authority Person responsible:

NMi Certin B.V.

M.Ph.D. Schmidt

Applicant and Manufacturer

Elster GmbH

Steinern Straße 19-21

55252 Mainz-Kastel

Germany

Identification of the certified type

An Ultrasonic Gas Meter

Manufacturers mark: Type:

Elster $ \mathrm{Q. S o n i c}^{\mathrm{m a x}}, $ $ \mathrm{Q. S o n i c}^{\mathrm{m a x} 6} $

Characteristics

See page 2 and further

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

0. 5; 1.0 for Q.Sonic $ ^{\mathrm{max}} $ 1.0 for Q.Sonic $ ^{\mathrm{max}6} $

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 14 July 2025

NMi Certin B.V.

Thijsseweg 11

2629 JA Delft

The Netherlands

T +31 88 636 2332

certin@nmi.nl

www.nmi.nl

Certification Board

This document is issued under the provision that no liability is accepted and that the applicant shall indemnify third-party liability.

The notification of NMi Certin B.V. as Issuing Authority can be verified at www.oiml.org

This document is digitally signed and sealed. The digital signature can be verified in the blue ribbon at the top of the electronic version of this certificate.

Number R137/2012-A-NL1-20.07 revision 5

Project number 3937886

Page 2 of 6

The conformity was established by the results of tests and examinations provided in the associated reports:

• NMi-9200288-01 dated 18 January 2012 that includes in total 48 pages;

• NMi-16200535-01 revision 1 dated 1 September 2017 that includes 35 pages;

• NMi-1902121-01 dated 12 October 2018 that includes 14 pages.

• NMi-2326650-01 dated 12 October 2020 that includes 20 pages.

• NMi-2500011-01 dated 29 June 2021 that includes 21 pages.

• NMi-3567045-01 dated 13 December 2022 that includes 19 pages.

• NMi-3684021-01 dated 6 June 2025 that includes 40 pages.

• NMi-3715752-01 dated 6 June 2025 that includes 15 pages.

Characteristics of the measuring instrument

In Table 1 the general characteristics of the measuring instrument are presented.

Table 2 gives an overview of the software versions of the electronics.

Table 3 and Table 4 give an overview of the general characteristics of the family of instruments.

The construction of the measuring instrument is recorded in documentation folder number T10586-5.

OIML Member State The Netherlands

Number R137/2012-A-NL1-20.07 revision 5

Project number 3937886

Page 3 of 6

Notes:

(★) These software modules are only mandatory if volume conversion is performed by the instrument. If this is not the case, the software modules are optional.

OIML Member State The Netherlands

Number R137/2012-A-NL1-20.07 revision 5 Project number 3937886 Page 4 of 6

OIML Member State The Netherlands

Number R137/2012-A-NL1-20.07 revision 5 Project number 3937886

Page 5 of 6

For tables 3 and 4, the corresponding flow rates can be calculated as follows:

$$ Q = V \cdot \frac {1}{4} \cdot \pi \cdot I D ^ {2} \cdot 3 6 0 0 = 9 0 0 \cdot \pi \cdot I D ^ {2} \cdot V $$

Where:

Q = flow rate [m $ ^{3} / \mathrm{h} ]$

V = velocity [m/s]

ID = inner diameter [m]

Notes:

[1] If higher values are chosen for Qmin and/or Qt and/or lower values for Qmax, it has to be taken into account that: 5 $ \leq $ $ Q_{\mathrm{max}}/Q_{\mathrm{min}}<50 $ $ Q_{\mathrm{max}}/Q_{t}\geq 5 $ $ - $ $ Q_{\mathrm{max}}/Q_{\mathrm{min}}\geq 50 $ $ Q_{\mathrm{max}}/Q_{t}\geq 10 $

Installation conditions:

Installation of the ultrasonic gas meter

For mild and severe flow disturbances the meter needs to be installed with the following minimum straight piping configuration as upstream inlet:

The flow conditioner (FC) can be of the following types and shall always be placed at the exact distance from the ultrasonic gas meter as indicated in the table above:

• CPA50 type A

• NOVA 50E

The outlet piping shall comply with:

• ≥3D

Any components which could affect the gas flow must be avoided within the above prescribed inlet pipe length. The necessary straight pipe length is stated on the name plate of the meter. The inlet pipe must be designed as a straight pipe section of the same nominal diameter as the gas meter with a maximum tolerance of $ \pm 3% $

OIML Member State The Netherlands

Number R137/2012-A-NL1-20.07 revision 5 Project number 3937886 Page 6 of 6

Bi-directional flow measurement

During conformity assessment it is sufficient to verify a bi-directional meter only in one direction.

Temperature sensor

The installation of a temperature sensor is at 2-5D from the outlet of the meter or of a dedicated measuring skid section (as described in chapter Measuring skid with two meters in series). For bidirectional applications, an additional temperature sensor can be installed 2-5D upstream of the meter or of a dedicated measuring skid section. The pipe spools including the thermowell(s) shall be installed and considered during the examination for putting into use of the gas meter.

Measuring skid with two meters in series

A conformity assessment is needed when the meter will be used in series with another ultrasonic meter (same or different type) and the length of the straight piping between the two meters is smaller than the minimum inlet or outlet length as mentioned in chapter 3.1 or if the meters are direct connected (flange to flange) to each other.

The conformity assessment has to be done on the complete measuring skid (USM package, including meter tubes, flow conditioner and thermowells) and the upstream meter must fulfil the inlet requirements of the downstream meter.

Alternative welded installation

The meters can be welded directly without flanges to the inlet and outlet pipes. The inlet and outlet pipe length shall be according the requirements as prescribed above for mild and/or severe disturbances. The complete meter package (meter including welded piping) shall be calibrated in order to guarantee compliance with Class 0.5 for Q.Sonic $ ^{\mathrm{max}} $ or Class 1.0 for Q.Sonic $ ^{\mathrm{max}} $ or Q.Sonic $ ^{\mathrm{max}} $ .

Interchangeable components:

The ultrasonic transducers and the electronics can be replaced with units of the same type and the meter still meets the requirements without the need for recalibration. After exchange of a part of the system, a diagnostic check shall be carried out. After exchange of an electronic board all parameters of the old electronics board need to be transferred to the replacement board.

Certificate history:

This revision replaces the previous version.