R137/2012-A-NL1-23.03 Rev. 0
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-23.03 revision 0
Project number 3466455
Page 1 of 3
Issuing authority
NMi Certin B.V. Person responsible: M.Ph.D. Schmidt
Applicant and Manufacturer
Zhejiang Chint Instrument & Meter Co., Ltd Wenzhou bridge Industrial Zone Yueqing CN 325603 Wenzhou Zheijang P.R. China
Identification of the certified type
A Diaphragm gas meter Type:
ZT-G1.6A ZT-G2.5A
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.
Issuing Authority
NMi Certin B.V., OIML Issuing Authority NL1 2 May 2023
Certification Board
OIML Certificate
Number R137/2012-A-NL1-23.03 revision 0 Project number 3466455 Page 2 of 3
The conformity was established by the results of tests and examinations provided in the associated report:
- No. NMi-3466455-01 dated 2 May 2023 that includes 44 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. T12326-1.
Table 1 General characteristics
| Maximum pressure | 0,5 |
| Environmental classes | M1/E2 |
| Ambient temperature range | -25-+55℃; condensing humidity |
| Gas temperature range | -25-+55℃ |
| Intended for the measurement of | Gas volume |
Table 2 General characteristics of the family of instruments
| Meter size | ZT-G1.6A | ZT-G2.5A |
| Minimum flow rate $Q_{\min}(m^{3}/h)$ | 0,016 | 0,025 |
| Transitional flow rate $Q_{t}(m^{3}/h)$ | 0,25 | 0,4 |
| Maximum flow rate $Q_{\max}(m^{3}/h)$ | 2,5 | 4 |
| Overload flow rate $Q_{r}(m^{3}/h)$ | 3 | 4,8 |
| Minimum working pressure $p_{\min}(bar a)$ | Atmospheric | |
| Maximum working pressure $p_{\max}(bar a)$ | 0,5 | |
| Indicating range $(m^{3})$ | 99999,999 | |
| Verification scale interval $(m^{3})$ | 0,002 | |
| Nominal diameter [mm] | 21 | 24 |
| Orientation | Vertical | |
OIML Certificate
OIML Member State The Netherlands
Number R137/2012-A-NL1-23.03 revision 0
Project number 3466455
Page 3 of 3
Certificate history:
This revision replaces the previous version.
| Revision | Date | Description of the modification |
| 0 | 2 May 2023 | Initial issue |