R137/2012-A-NL1-22.02 Rev. 1
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-22.02 revision 1 Project number 3506247 Page 1 of 4
Issuing authority
NMi Certin B.V.
Person responsible: M.Ph.D. Schmidt
Applicant and Manufacturer
ZENNER Metering Technology (Shanghai) Ltd.
NO.6558, East Yinggang Road
Qingpu Industrial Zone
Shanghai
P.R. China
Identification of the certified type
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 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 20 January 2023
Certification Board
NMi Certin B.V.
Thijsseweg 11
2629 JA Delft
The Netherlands
T +31 88 636 2332
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
Reproduction of the complete document only is permitted.
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.
OIML Certificate
Number R137/2012-A-NL1-22.02 revision 1 Project number 3506247 Page 2 of 4
The conformity was established by the results of tests and examinations provided in the associated report(s):
No. NMi-2238753-02 dated 28 February 2022 that includes 29 pages.
No. NMi-3506247-02 dated 20 January 2023 that includes 12 pages.
Characteristics of the measuring instrument
In Table 1, the general characteristics of the measuring instrument are presented. Tables 2 and 3 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/E1 |
| Accuracy class | 1,0 |
| Maximum pressure | 16 bar(g) |
| Ambient temperature range | -25...+55℃ |
| Gas temperature range | -25...+55℃ |
| Designed for | Non-condensing humidity/condensing humidity |
| Orientation | Horizontal, vertical up and vertical down all orientations |
| Flow direction | Uni-directional(indicated with arrow) |
| Lubrication | Aeroshell Fluid 10 |
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-22.02 revision 1
Project number 3506247
Page 3 of 4
Table 2 Essential characteristics of the family of instruments
| Nominal diameter [mm] | Type | Cyclic volume [dm3] | Qmin[m3/h] | Qt[m3/h] | Qmax[m3/h] |
| 25 | G10 | 0,22 | 0,4 | 1,6 | 16 |
| 25 | G16 | 0,4 | 2,5 | 25 | |
| 40 | G16 | 0,4 | 2,5 | 25 | |
| 40 | G25 | 0,4 | 4 | 40 | |
| 50 | G25 | 0,70 | 0,65 | 4 | 40 |
| 50 | G40 | 0,65 | 6,5 | 65 | |
| 50 | G65 | 0,65 | 10 | 100 | |
| 80 | G65 | 1,11 | 0,65 | 10 | 100 |
| 80 | G100 | 0,65 | 16 | 160 | |
| 80 | G160 | 2,06 | 1,6 | 25 | 250 |
| 100 | G160 | 2,55 | 1,6 | 25 | 250 |
| 100 | G250 | 3,97 | 2,5 | 40 | 400 |
| 100 | G400 | 2,5 | 65 | 650 | |
| 150 | G400 | 10,83 | 4 | 65 | 650 |
| 150 | G650 | 13,38 | 6,5 | 100 | 1000 |
| 200 | G1000 | 17,45 | 10 | 160 | 1600 |
Table 3 Verification scale interval
| Type | Number of drums | Control element[m3] | |
| Before the comma | Behind the comma | ||
| G10-G100 | 6 | 2 | 0.002 |
| G160-G1000 | 7 | 1 | 0.02 |
Installation conditions:
For this rotary gas meter, no specific installation conditions are applicable.
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-22.02 revision 1
Project number 3506247
Page 4 of 4
History file
This revision replaces the previous version.
| Revision | Date | Description of the modification |
| Initial | 1 March 2022 | Initial issue |
| 1 | 20 January 2023 | Additional testing, lower Qmin |