R137/2012-B-NL1-18.07
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-B-NL1-18.07 Project number 1901778 Page 1 of 4
Issuing authority NMi Certin B.V. Person responsible C.Oosterman
Applicant and GFO Flow Solutions B.V.
Manufacturer Magnesiumstraat 14
6031 RV Nederland
The Netherlands
Identification of the A rotary displacement gas meter certified type Type: GFO-RM
Characteristics See page 2 and 3
This OIML Certificate is issued under scheme B
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 1.0
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
24 May 2018
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
OIML Member State The Netherlands
Number R137/2012-B-NL1-18.07
Project number 1901778
Page 2 of 4
The conformity was established by the results of tests and examinations provided in the associated reports:
NMi-14200731-02 dated 4 June 2015 that includes 19 pages;
NMi-SO14200462-02 dated 20 February 2014 that includes 13 pages;
NMi-10200626-02 dated 29 May 2012 that includes 51 pages.
Characteristics of the gas meter
Table 1 gives the general characteristics of the meter type. Tables 2 and 3 specify in detail the essential characteristics and verification scale interval.
Table 1 General characteristics
| Destined for the measurement of | Gas volume |
| Mechanical class | M2 |
| Electromagnetic class | Not applicable(the meter has no electronics) |
| Ambient temperature range | -25℃/+55℃ |
| Gas temperature range | -25℃/+55℃ |
| Designed for humidity conditions | Not applicable(the meter has no electronics) |
| Orientation | Non MPV: horizontal, vertical upMPV: horizontal, vertical up and vertical down(all orientations) |
| Flow direction | Uni-directional(indicated with arrow) |
| Power supply voltage | Not applicable |
| Software identification | Not applicable |
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| Cyclic volume[dm3] | Type | Version | Qmax[m3/h] | Qt[m3/h] | Qmin[m3/h] | Nominal diameter[mm] |
| 0,26 | G10 | - | 16 | 125 | 0,5 | 40 |
| G16 | - | 25 | 125 | 0,5 | 40 | |
| G25 | - | 40 | 2 | 0,5 | 40 | |
| 0,69 | G10 | MPV | 16 | 125 | 0,5 | 40/50 |
| G16 | MPV | 25 | 125 | 0,5 | 40/50 | |
| G25 | MPV | 40 | 2 | 0,5 | 40/50 | |
| G40 | MPV | 65 | 325 | 0,5 | 40/50 | |
| G65 | MPV | 100 | 5 | 0,5 | 40/50 | |
| 1,11 | G40 | MPV | 65 | 325 | 0,8 | 50/80 |
| G65 | MPV | 100 | 5 | 0,8 | 50/80 | |
| G100 | MPV | 160 | 8 | 0,8 | 50/80 | |
| 2,31 | G65 | MPV | 100 | 125 | 125 | 80 |
| G100 | MPV | 160 | 125 | 125 | 80 | |
| G160 | MPV | 250 | 125 | 125 | 80 | |
| 2,98 | G100 | MPV | 160 | 8 | 2 | 80/100 |
| G160 | MPV | 250 | 125 | 2 | 80/100 | |
| G250 | MPV | 400 | 20 | 2 | 80/100 | |
| 3,88 | G250 | SYNC MPV | 400 | 20 | 325 | 100/150 |
| G400 | SYNC MPV | 650 | 325 | 325 | 100/150 | |
| 5,97 | G400 | SYNC MPV | 650 | 325 | 5 | 150 |
| G650 | SYNC MPV | 1000 | 50 | 5 | 150 |
Remarks regarding table 2:
SYNC indicates that the meter is always equipped with a double pair of impellers.
The overload flow rate $ \left(Q_{r}\right) $ for all rotary meters is equal to $ 1,2\cdot Q_{\mathrm{max}}. $
The working pressure range for all rotary displacement gas meters is atmospheric up to and including 20 bar(g).
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| Type | number of drums | control-element[m3] | |
| before the comma | behind the comma | ||
| G10-G65 | 6 | 2 | 0,002 |
| G100-G650 | 7 | 1 | 0,02 |
Installation conditions
Non MPV meters can be installed in two flow directions, left to right or top to bottom.
MPV meters can be installed in horizontal, vertical up and vertical down position.
Regarding flow disturbance there are no specific installation requirements.