R137/2012-B-NL1-18.03
OIML Certificate
OIML Member State The Netherlands
Number R 137/2012-B-NL1-18.03 Project number 16200607 Page 1 of 2
Issuing authority NMi Certin B.V. Person responsible: C. Oosterman
Applicant and Chengdu Qinchuan IoT Technology Co., Ltd.
Manufacturer No.10 Xingye Ave., Jiepai Industrial Park, Longquanyi District
610100 Chengdu
P.R. China
Identification of the A diaphragm gas meter certified type Type: Gx-xx
Characteristics See page 2 and further
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 1,5
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
25 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 R 137/2012-B-NL1-18.03 Project number 16200607 Page 2 of 2
The conformity was established by the results of tests and examinations provided in the associated report(s):
No. NMi-16200607-01 dated 18 January 2018 that includes 34 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.
The construction of the measuring instrument is recorded in the Documentation folder no. T10885-1.
Table 1 General characteristics
| Destined for the measurement of | Gas volume |
| Environmental classes | M1/E1 |
| Accuracy class | 1,5 |
| Maximum pressure | 0,5 bar |
| Ambient temperature range | -10-+40℃ |
| Gas temperature range | -10-+40℃ |
| Designed for | Condensing humidity |
Table 2 General characteristics of the family of instruments
| Meter size | G4 | G2,5 | G1,6 |
| Minimum flow rate $Q_{\mathrm{min}}$(m3/h) | 0,016 or 0,025 or 0,04 | 0,016 or 0,025 | 0,016 |
| Transitional flow rate $Q_{\mathrm{t}}$(m3/h) | 0,25 or 0,4 or 0,6 | 0,25 or 0,4 | 0,25 |
| Maximum flow rate $Q_{\mathrm{max}}$(m3/h) | 6 | 4 | 2,5 |
| Overload flow rate $Q_{\mathrm{r}}$(m3/h) | 7,2 | 4,8 | 3 |
| Cyclic volume(dm3) | 1,2 | 1,2 | 1,2 |
| Indicating range(m3) | 99999 | 99999 | 99999 |
| Verification scale interval(m3) | 0,0002 | 0,0002 | 0,0002 |