R137/2012-NL1-2017.07
OIML Certificate of Conformity
OIML Member State The Netherlands
Number R 137/2012-NL1-17.07 Project number 1901121 Page 1 of 4
Issuing authority NMi Certin B.V.
Person responsible: C. Oosterman
Applicant and Flow Meter Group B.V.
Manufacturer Meniststraat 5c
7091 ZZ Dinxperlo
The Netherlands
Identification of the An ultrasonic gas meter certified type Type: FMU
Characteristics See page 2 and further
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
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
16 November 2017
C. Oosterman Head Certification Board
NMi Certin B.V.
Hugo de Grootplein 1
3314 EG Dordrecht
the Netherlands
T +31 78 6332332
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
OIML Certificate of Conformity
OIML Member State The Netherlands
Number R 137/2012-NL1-17.07
Project number 1901121
Page 2 of 4
The conformity was established by the results of tests and examinations provided in the associated report(s):
No. NMi-16200107-01 dated 28 October 2016 that includes 51 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.
The construction of the measuring instrument is recorded in the Documentation folder no. T1094-3.
Table 1 General characteristics
| Destined for the measurement of | Gas volume | |
| Environmental classes | M1/E2 | |
| Accuracy class | 0,5 | |
| Maximum pressure | 103 bar a | |
| Ambient temperature range | -25-+55℃ | |
| Gas temperature range | -25-+55℃ | |
| Designed for | condensing humidity | |
| Orientation | All orientations | |
| Power supply voltage | 18,28V DC | |
| Software identification | Main version:1.0.3FPGA version:1.0.0 | Checksum:E9B0C4B7 |
| Main version:1.0.4FPGA version:1.0.1 | Checksum:77A54A9D | |
| Main version:1.0.6FPGA version:1.0.4 | Checksum:43F6D289 | |
| Main version:1.0.7FPGA version:1.0.4 | Checksum:544882BB | |
OIML Certificate of Conformity
OIML Member State The Netherlands
Number R 137/2012-NL1-17.07
Project number 1901121
Page 3 of 4
Table 2 General characteristics of the family of instruments
| Diameter | Vmin[m/s] | Vt[m/s] | Vmax[m/s] | |
| Nominal Size[-] | Inner diameter[mm] | |||
| 4"/DN100 | 80~105 | 0,51 | 1/10Vmax | 33,50 |
| 6"/DN150 | 130~155 | 0,40 | 30,00 | |
| 8"/DN200 | 180~210 | 0,30 | ||
| 10"/DN250 | 230~260 | |||
| 12"/DN300 | 270~320 | |||
| 14"/DN350 | 300~345 | 28,00 | ||
| 16"/DN400 | 350~390 | 27,00 | ||
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. $
Installation conditions:
Installation of the gas meter
The meter needs to be installed with minimally 5D+a NOVA 50E design compliant flow conditioner + 10D of straight inlet pipe upstream and 4D of outlet pipe. A thermowell may be mounted at 2-5D 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.
OIML Certificate of Conformity
OIML Member State The Netherlands
Number R 137/2012-NL1-17.07
Project number 1901121
Page 4 of 4
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. Additional information is recorded in document no. 10947/1-01.