R137/2012-A-NL1-22.02 Rev. 0
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-22.02 revision 0
Project number 2486983
Page 1 of 2
Issuing authority
NMi Certin B.V.
Person responsible: M.Ph.D. Schmidt
EDMI Limited 47 Yishun Industrial Park A, Singapore 768724 Singapore
Identification of the certified type
An ultrasonic gas meter Type: GC-25AU
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
1,5
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 7 June 2022
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
OIML Member State The Netherlands
Number R137/2012-A-NL1-22.02 revision 0 Project number 2486983 Page 2 of 2
The conformity was established by the results of tests and examinations provided in the associated report(s):
No. NMi-2450887-01 dated 6 May 2021 that includes 46 pages;
No. NMi-2486983-01 dated 7 June 2022 that includes 46 pages.
Characteristics of the measuring instrument
In Table 1 the general characteristics of the measuring instrument are presented.
Table 1 General characteristics
| Destined for the measurement of | Gas volume |
| Environmental classes | M1/E2 |
| Accuracy class | 1,5 |
| Maximum pressure(bar g) | 0,5 |
| Ambient temperature range | -10-+55℃ |
| Gas temperature range | -10-+55℃ |
| Designed for | Condensing humidity |
| Power supply voltage | 3,5-3,6V DC |
| Software identification | Version number:01.02.02.05 Checksum:D3B853D2 |
| Minimum flow rate $ Q_{\min} $ (m3/h) | 0,16 |
| Transitional flow rate $ Q_{t} $ (m3/h) | 2,5 |
| Maximum flow rate $ Q_{\max} $ (m3/h) | 25 |
| Overload flow rate $ Q_{r} $ (m3/h) | 30 |
| Indicating range(m3) | 999999,99 |
| Verification scale interval(m3) | 0,00025 |
Certificate history:
This revision replaces the previous version.
| Revision | Date | Description of the modification |
| Initial | 7 June 2022 | Initial issue |