R85/2008-A-NL1-26.02 Rev. 1
OIML Certificate
OIML Member State The Netherlands
Number R85/2008-A-NL1-26.02 revision 1
Project number 4100100
Page 1 of 3
Issuing authority NMi Certin B.V. Person responsible: M.Ph.D. Schmidt
Manufacturer RTI Management Groups Co., Ltd Room 215, Building C, No.11 Fengxiangsanyuan, Yangsong Town Huairou District, Beijing China
Identification of the certified type An automatic level gauge (servo principle) with temperature and density displacer sensor Manufacturers mark: RTI Type: RTG-800 series
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 85-1&2:2008 "Automatic level gauges for measuring the level of liquid in stationary storage tanks"
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 May 2026
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.
OIML Certificate
OIML Member State The Netherlands
Number R85/2008-A-NL1-26.02 revision 1
Project number 4100100
Page 2 of 3
The conformity was established by the results of tests and examinations provided in the associated report(s):
No. NMi-2579596-01 $ ^{1} $ dated 14 June 2022 that includes 29 pages;
No. NMi-2579596-02 dated 14 June 2022 that includes 23 pages;
No. NMi-3866763-01 dated 25 May 2025 that includes 29 pages;
No. NMi-3866764-01 dated 27 June 2025 that includes 11 pages.
Characteristics of the measuring instrument
In Table 1 the general characteristics of the measuring instrument are presented.
The construction of the measuring instrument is recorded in Documentation folder number R85-2008-A-NL1-26.02-2.
The automatic level gauge is intended to measure by serve principle automatically and display the level of liquid contained in a tank. Herewith the following displacer types can be used:
SF displacer with no additional sensors;
TF displacer including temperature sensor;
MF displacer including temperature sensor and density sensor.
Table 1 General characteristics
| Maximum measuring range level | 50 metres | |
| Ambient temperature range | -40-+70℃; condensing humidity | |
| Temperature displacer measuring range | -5-+35℃(only applicable for TF and MF displacers) | |
| Density displacer measuring range | 600-1020kg/m3(only applicable for MF displacers)at maximum viscosity of 5mPa·s | |
| Power supply voltage | 200-240V AC;50/60Hz or24-48V DC | |
| Software identification | Level gaugeVersion number:V50.8-Checksum:31452TF or MF displacerVersion number:V10.9-Checksum:63162 | |
| Data communication | Inputs | -HART |
| Outputs | -Modbus-BPM-HART-4-20mA analog output | |
OIML Certificate
OIML Member State The Netherlands
Number R85/2008-A-NL1-26.02 revision 1 Project number 4100100
Page 3 of 3
Certificate history:
| Revision | Date | Description of the modification |
| 0 | 28 April 2026 | Initial issue. Parallel of R85/2008-A-NL1-22.02R2 |
| 1 | 7 May 2026 | Removing applicant and update documentation folder with RTI's documents |