R137/2012-A-NL1-26.01 Rev. 0
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-26.01 revision 0 Project number 2719927 Page 1 of 3
Issuing authority NMi Certin B.V. Person responsible: M.Ph.D. Schmidt
Applicant and Manufacturer
Identification of the certified type
Goldcard Smart Group Co., Ltd.
No.158 Jinqiao Street, Qiantang District, Hangzhou
Zhejiang 310018
P.R. China
An ultrasonic gas meter
Manufacturers mark:
Goldcard
JGU-yyxxS
Type:
Characteristics See following page(s)
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 3 February 2026
Certification Board
This document is issued under the provision that no liability is accepted and that the applicant shall indemnify third-party liability.
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-26.01 revision 0 Project number 2719927 Page 2 of 3
The conformity was established by the results of tests and examinations provided in the associated report(s):
- No. NMi-2719927-01c dated 25 March 2024 that includes 11 pages;
Page 2 of 3
No. NMi-2719927-02c dated 25 March 2024 that includes 19 pages;
No. NMi-2719927-03 dated 3 February 2026 that includes 58 pages;
No. NMi-2719927-04 dated 3 February 2026 that includes 49 pages.
Characteristics of the measuring instrument
In Table 1 the general characteristics of the measuring instrument are presented.
In Table 2 the characteristics of the family of instruments are presented.
The construction of the measuring instrument is recorded in the Documentation folder no. T12307-1.
Table 1 General characteristics
| Maximum pressure | 0,5 bar |
| Environmental classes | M1/E2 |
| Ambient temperature range | -25-+55℃; condensing humidity |
| Gas temperature range | -25-+55℃ |
| Orientation | Connection ports vertical |
| Intended for the measurement of | Natural gas types H,L and E,with a Gross Wobbe Index between 39,1MJ/m3and 54,7MJ/m3at15℃and1,01325 bar,including mixtures with a hydrogen concentration of up to 23% by volume. |
| Power supply voltage | 3,6VDC internal battery |
| Software identification | Version number:02203603Checksum:0x247F69C9 |
| Communication module(yyinJGU-yyxxS) | G GPRSNB-IoTLoRaWANSF Sigfox |
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-26.01 revision 0
Project number 2719927
Table 2 General characteristics of the family of instruments
Page 3 of 3
| Meter type(xx in JGU-yyxxS) | 1.6 | 2.5 | 4W | 4 | 6W | 6 | 10 | 16W | 16 | 25 |
| Minimum flow rate $Q_{\mathrm{min}}$(m3/h) | 0,016 | 0,025 | 0,016 | 0,04 | 0,04 | 0,06 | 0,1 | 0,1 | 0,16 | 0,25 |
| Transitional flow rate $Q_{\mathrm{t}}$(m3/h) | 0,25 | 0,4 | 0,25 | 0,6 | 0.6 | 1 | 1,6 | 1,6 | 2,5 | 4 |
| Maximum flow rate $Q_{\mathrm{max}}$(m3/h) | 2,5 | 4 | 6 | 6 | 10 | 10 | 16 | 16 | 25 | 40 |
| Overload flow rate $Q_{\mathrm{r}}$(m3/h) | 3 | 4,8 | 7,2 | 7,2 | 12 | 12 | 19,2 | 19,2 | 30 | 48 |
| Indicating range(m3) | 99 999,9999 | 999 999,999 | ||||||||
| Verification scale interval(m3) | 0,0001 | 0,001 | ||||||||
| Centreline distance[mm] | 90110130 | 110130152,4160 | 152,4160180 | 180200220 | ||||||
| Connection size | M30G 3/4"G 7/8"G 1 1/4" | M36M42G 1 1/4"G 1 1/2" | M42M64G 1 1/4"G 1 1/2"G 2"G 2 1/2"G 2 3/4" | M64M80G 1 3/4"G 2"G 2 1/2"G 2 3/4" | ||||||
Certificate history:
| Revision | Date | Description of the modification |
| 0 | 03-02-2026 | Initial issue |