R137/2012-A-NL1-22.03 Rev. 1
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-22.03 revision 1
Project number 3512545
Page 1 of 4
Issuing authority
NMi Certin B.V.
Person responsible: M.Ph.D. Schmidt
Applicant and Manufacturer
Zhejiang Cangnan instrument Group Co., Ltd.
No.345, Strait Avenue, Lingxi Town, Cangnan County
Wenzhou City, Zhejiang Province
P.R. China 325800
Identification of the certified type
A rotary displacement gas meter Type:RM Series
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
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 19 June 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
OIML Certificate
Number R137/2012-A-NL1-22.03 revision 1 Project number 3512545 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.
NMi-3512545-01 dated 30 June 2022 that includes 20 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.
Table 1 General characteristics
| Destined for the measurement of | Gas volume |
| Environmental classes | M1/E2 |
| Accuracy class | 1,0 |
| Maximum pressure | 20 bar |
| Ambient temperature range | -25℃/+55℃ |
| Gas temperature range | -25℃/+55℃ |
| Designed for | Condensing humidity |
| Orientation Non MPV* | horizontal, vertical up |
| Orientation MPV* | horizontal, vertical up and vertical down(all orientations) |
| Flow direction | Uni-directional(indicated with arrow) |
| Power supply voltage | Not applicable |
| Software identification | Not applicable |
- MPV, see table 2 for further specification.
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-22.03 revision 1
Project number 3512545
Page 3 of 4
Table 2 General characteristics of the family of instruments
| Cyclic volume[dm3] | Type | Version | Qmax[m3/h] | Qt[m3/h] | Qmin[m3/h] | Nominal diameter[mm] |
| 0,26 | G16 | - | 25 | 1,25 | 0,5 | 40 |
| G25 | - | 40 | 2 | 0,5 | 40 | |
| 0,69 | G10 | MPV | 16 | 1,25 | 0,5 | 40/50 |
| G16 | MPV | 25 | 1,25 | 0,5 | 40/50 | |
| G25 | MPV | 40 | 2 | 0,5 | 40/50 | |
| G40 | MPV | 65 | 3,25 | 0,5 | 40/50 | |
| G65 | MPV | 100 | 5 | 0,5 | 40/50 | |
| 1,11 | G40 | MPV | 65 | 3,25 | 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 | 10 | 1,25 | 80 |
| G100 | MPV | 160 | 12,5 | 1,25 | 80 | |
| G160 | MPV | 250 | 12,5 | 1,25 | 80 | |
| 2,98 | G100 | MPV | 160 | 8 | 2 | 80/100 |
| G160 | MPV | 250 | 12,5 | 2 | 80/100 | |
| G250 | MPV | 400 | 20 | 2 | 80/100 | |
| 3,88 | G250 | SYNC MPV | 400 | 20 | 3,25 | 100/150 |
| G400 | SYNC MPV | 650 | 32,5 | 3,25 | 100/150 | |
| 5,97 | G400 | SYNC MPV | 650 | 32,5 | 5 | 150 |
| G650 | SYNC MPV | 1000 | 50 | 5 | 150 |
Remarks regarding table 2:
MPV indicates that the meter optionally can be manufactured as a Multi Position Version.
SYNC indicates that the meter is always equipped with a double pair of impellers.
The overload flow rate $ \left( Q_{\mathrm{r}} \right) $ for all rotary meters is equal to $ 1,2\cdot Q_{\mathrm{m a x}}. $
The working pressure range for all rotary displacement gas meters is atmospheric up to and including 20 bar(g).
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-22.03 revision 1
Project number 3512545
Page 4 of 4
Table 3 Verification scale interval
| Type | Cyclic volume | number of drums | control-element[m3] | |
| before the comma | behind the comma | |||
| G10-G100 | ≤1,11 | 6 | 2 | 0,002 |
| G100-G650 | ≤2,31 | 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.
Revision history
| Revision | Date | Description of the modification |
| Initial | 30 June 2022 | Initial issue |
| 1 | 19 June 2023 | Address Update |