R117/2019-A-NL1-23.02 Rev. 1
OIML Certificate
OIML Member State The Netherlands
Number R 117/2019-A-NL1-23.02 revision 1
Project number 3739563
Page 1 of 5
Issuing authority NMi Certin B.V. Person responsible: M.Ph.D. Schmidt
Applicant and Oil & Gas Measurement Limited Manufacturer Denmark House, St. Thomas Place ELY, Cambridgeshire, CB7 4EX United Kingdom
An ultrasonic measurement transducer intended to be used as a part of a non-interruptible dynamic measuring system.
Brand: Metering & Technology SAS
Type: DFX-MM
DFX-LV
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 117-1:2019 "Dynamic measuring systems for liquids other than water"
Accuracy class 0,3;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 5 July 2024
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
Number R 117/2019-A-NL1-23.02 revision 1 Project number 3739563 Page 2 of 5
The conformity was established by the results of tests and examinations provided in the associated reports:
No. NMi-16200659-01 dated 23 February 2016 that includes 6 pages;
No. NMi-16200659-02 dated 23 February 2016 that includes 13 pages;
No. NMi-3595548-01 dated 11 April 2023 that includes 44 pages;
No. NMi-3739563-01 dated 05 July 2024 that includes 43 pages.
Characteristics of the measuring instrument
In Table 1 the general characteristics of the DFX series common to both DFX-MM and DFX-LV are presented.
In table 2 and table 3 the characteristics of DFX-MM are presented.
In table 4 and table 5 the characteristics of DFX-LV are presented.
The construction of the DFX series measuring instrument is recorded in the Documentation folder no. 16200659-2.
Table 1 General characteristics of DFX series
| Manufacturer's trademark | Oil & Gas Measurement Limited |
| Accuracy class | 0,3 or 1,0; See table 2 and 4 for type DFX-MM and type DFX-LV |
| Measurement principle | Ultrasonic |
| Path angle | Various |
| Sound frequency | 1 MHz-2 MHz |
| Environment Classes | M1/E2/H3 |
| Ambient temperature range | -25℃...+55℃ |
| Straight pipe length requirements | Upstream 10D(+flow straightener)Downstream 5D |
| Electrical power | 230VAC/50Hz;24VDC;Earth connection of the internal power supply not to be connected. |
| Identification of software | Version:15.1110/Checksum:0x6C428B12 |
| Version:20.0514/Checksum:0x2D298303 |
OIML Certificate
OIML Member State The Netherlands
Number R 117/2019-A-NL1-23.02 revision 1 Project number 3739563 Page 3 of 5
Table 2 Characteristics of type DFX-MM
| Number of sound paths | 32(total 16 transducers) |
| Liquid temperature range | -5℃...+35℃;(accuracy class0,3)-25℃...+55℃(accuracy class1,0) |
| Density range | 725...1050kg/m3 |
| Maximum viscosity | 1398mPa·s |
| Minimum Reynolds number | 1.000 |
| Maximum pressure | 105bar(g) |
Table 3 Characteristics of the DFX-MM family of instruments
| Type | Size | Minimum flow rate[m3/h] | Maximum flow rate[m3/h] | MMQ[m3] | Remarks |
| DFX-MM04 | 4"(100mm) | 15 | 400 | 0,5 | |
| DFX-MM06 | 6"(150mm) | 30 | 800 | 2 | |
| DFX-MM08 | 8"(200mm) | 60 | 1500 | 2 | |
| DFX-MM10 | 10"(250mm) | 90 | 2500 | 5 | |
| DFX-MM12 | 12"(300mm) | 130 | 3200 | 5 | |
| DFX-MM14 | 14"(350mm) | 160 | 3800 | 10 | |
| DFX-MM16 | 16"(400mm) | 200 | 5000 | 10 | |
| DFX-MM18 | 18"(450mm) | 310 | 5000 | 20 | |
| DFX-MM20 | 20"(500mm) | 390 | 5000 | 20 |
OIML Certificate
OIML Member State The Netherlands
Number R 117/2019-A-NL1-23.02 revision 1 Project number 3739563 Page 4 of 5
Table 4 Characteristics of type DFX-LV
| Number of sound paths | 15(total 10 transducers) |
| Liquid temperature range | -5℃...+35℃(accuracy class0,3) |
| Density range | 630...950kg/m3 |
| Maximum viscosity | 19,8mPa·s |
| Minimum Reynolds number | 10.000 |
| Maximum pressure | 10bar(g) |
Table 5 Characteristics of the DFX-LV family of instruments
| Type | Size | Minimum flow rate[m3/h] | Maximum flow rate[m3/h] | MMQ[m3] | Remarks |
| DFX-LV04 | 4"(100mm) | 15 | 322 | 0,5 | |
| DFX-LV06 | 6"(150mm) | 65 | 644 | 2 | |
| DFX-LV08 | 8"(200mm) | 120 | 644 | 2 | |
| DFX-LV10 | 10"(250mm) | 200 | 644 | 5 | Requires an automatic checking device to detect and generate an alarm when the flow rate is outside the restricted flow range |
| DFX-LV12 | 12"(300mm) | 250 | 3000 | 5 | |
| DFX-LV14 | 14"(350mm) | 320 | 3200 | 10 | |
| DFX-LV16 | 16"(400mm) | 400 | 4000 | 10 | |
| DFX-LV18 | 18"(450mm) | 520 | 5200 | 10 |
Note : Before taken into use the DFX-LV meter shall be calibrated on the product it is going to measure or on a product with similar properties (density and viscosity) at operating temperature and pressure (if possible).
This calibration should cover the entire Reynolds range (taking into account the operating ranges e.g. flow rate and viscosity) of the measuring system in which the measurement device is used.
OIML Certificate
OIML Member State The Netherlands
Number R 117/2019-A-NL1-23.02 revision 1
Project number 3739563
Page 5 of 5
Certificate history:
This revision replaces the previous version
| Revision | Date | Description of the modification |
| 0 | 11 April 2023 | First release |
| 1 | 5 July 2024 | Addition of the meter type DFX-MM. Extension of the meter specification for type DFX-LV. |