R137/2012-A-NL1-20.11 Rev. 4

OIML Member State The Netherlands

Number R137/2012-A-NL1-20.11 revision 4 Project number 3603909 Page 1 of 5

Issuing authority

NMi Certin B.V.

Person responsible: M.Ph.D. Schmidt

Applicant and Manufacturer

Pietro Fiorentini S.p.A. Via E.Fermi, 8/10 36057 Arcugnano (VI) Italy

Identification of the certified type

An ultrasonic gas meter Type: FSN-4P

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 and/or 1,0 (depending on installation conditions & $ Q_{\mathrm{min}} $ flow rate)

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.

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 6 March 2023

Certification Board

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

Reproduction of the complete document only is permitted.

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

Number R137/2012-A-NL1-20.11 revision 4 Project number 3603909 Page 2 of 5

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

• No. NMi-1901574-01 dated 2 November 2017 that includes 13 pages.

• No. NMi-16200107-01R1 dated 15 December 2016 that includes 52 pages.

• No. NMi-2258343-01 dated 20 September 2019 that includes 17 pages.

• No. NMi-2258343-02 dated 23 April 2020 that includes 11 pages.

• No. NMi-2607480-01 dated 26 April 2021 that includes 36 pages

• No. NMi-3603909-01 dated 6 March 2023 that includes 30 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 general characteristics of the family of instruments.

OIML Member State The Netherlands

Number R137/2012-A-NL1-20.11 revision 4 Project number 3603909 Page 3 of 5

The meter consists of a cylindrical spool piece with 4 horizontal paths. Multiple configurations can be combined in a single housing:

• 4 paths configuration Single meter;

• 4+1 configuration 4 pay and 1 check;

• 4+2 configuration 4 pay and 2 check;

• 4+3 configuration 4 pay and 3 check;

• 4+4 configuration Either as Pay and check or as 2 separate meters.

When the meter is equipped with a double meter configuration, the pay and check meter shall have a different indicator. A clear distinction between Pay and check indicator shall be present, both meters must have their own nameplate with unique serial number.

Table 2 General characteristics of the family of instruments

The corresponding flow rates can be calculated as follows:

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

Where:

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

v = velocity [m/s]

D = internal diameter [m]

Higher values of $ Q_{\min} $ and lower values of $ Q_{\max} $ are allowed on condition that $ Q_{\min}\leq0,05 $ $ Q_{\max} $ and $ Q_{\max}/Q_{t}\geq5. $

OIML Member State The Netherlands

Number R137/2012-A-NL1-20.11 revision 4 Project number 3603909 Page 4 of 5

Installation conditions:

Installation of the gas meter

The meter needs to be installed according one of the following configurations for mild and/or severe flow disturbance:

• Mild and severe flow disturbance, class 0,5:

O Upstream: a minimum of 5D + NOVA 50E + 10D of straight pipe Downstream: a minimum of 4D straight pipe. The flow conditioner shall be a NOVA 50E compliant design.

• Mild and severe flow disturbance, class 0,5:

O Upstream: a minimum of 5D + PTB Flow conditioner + 5D of straight inlet pipe Downstream: a minimum of 3D straight pipe. The flow conditioner shall be a PTB compliant design.

• Mild flow disturbance, class 1,0:

O Upstream: a minimum of 2D + TI TWIN type flow conditioner + 3D of straight inlet pipe Downstream: a minimum of 3D straight pipe. The TI TWIN type flow conditioner shall be a PTB & NOVA 50E compliant design.

The detailed installation requirements and the construction of the TI TWIN type flow conditioner are recorded in EU-Type examination certificate T11816.

Thermowell

A thermowell may be mounted at 2D-5D from the outlet of the meter.

Bi-directional flow measurement

During conformity assessment it is sufficient to verify a bi-directional meter in one direction only. For bi-directional flow measurement the outlet pipe and flow conditioner shall be identical to the inlet. The installation of a temperature sensor is at 2-5D from the outlet of the meter. For bi-directional applications an additional temperature sensor can be installed 2-5D upstream of the meter. For bi-directional applications the meter and pipe spools including the thermo well(s), shall be calibrated as a meter package during the examination for putting into use of the gas meter.

For bidirectional meters $ V_{\mathrm{min}} $ limitations apply, see table 2.

Alternative welded configuration of the gas meter

The central meter body can be welded directly onto the flanges or to inlet and outlet pipes. The welding may not cause more than a 3% diameter step. The meter shall be installed as stated in "Installation of the gas meter". The central meter body, including welded piping or welded flanges shall be calibrated as a meter package during the examination for putting into use of the gas meter.

Maintenance

A transducer path pair can be exchanged without deterioration of the metrological performance.

The electronics mainboard can be exchanged without deterioration of the metrological performance.

OIML Certificate

OIML Member State The Netherlands

Number R137/2012-A-NL1-20.11 revision 4

Project number 3603909

Page 5 of 5