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The task of the "Cold Water Meter Type Evaluation Program" issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China (AQSIQ [2015] No. 146") issued by the General Administration of Quality Supervision, Inspection and Quarantine on the Relevant Matters Concerning the Implementation of the National Metrology Technical Regulation System Revision (2015) The project schedule for measurement and technical regulation system revision and revision is planned by the National Traffic Capacity Measurement Technical Committee (MTC8) and the Zhejiang Provincial Metrology Science Research Institute is the main drafting unit to undertake specific revision tasks. Participating drafting bodies include the Beijing Academy of Metrology and Inspection, the Shandong Academy of Metrology, the Henan Academy of Metrology, and the water metering companies Ningbo Water Meter Co., Ltd. and Jiangxi Shanchuan Water Meter Co., Ltd.
The outline uses the redrafted law to amend the OIML49-1:2013 and OIMLR49-2:2013 international recommendations of the International Organization of Legal Metrology (OIML). Based on this, it combines the characteristics of existing water meter types in China, and increases the prepayment and remote transmission for China. Types of specific requirements for mechanical water meters with electronic devices. These specific requirements were merged with the relevant requirements of OIMLR49 to maintain overall compatibility with the OIMLR49.
Compared with the previous version evaluation outline JJG162-2009 Appendix A, in addition to the major changes in the format of the preparation, the main technical content changes as follows:
- The minimum value of Q3/Q1 is increased from 10 to 40 (measurement requirements);
—— Abolished the scope of application of the accuracy class 1 water meter (measurement requirements part);
——The optional Q2/Q1 equal to 2.5, 4 or 6.3 (requirements for metering requirements) has been cancelled for water gauges with a nominal diameter above DN50 or Q3 >16m3/h;
- Increased repetitive requirements (measurement requirements);
- Added specific requirements for adjustment and correction devices (measurement requirements);
- Increased the error requirements and test methods for cartridge replacement water meters and replaceable metering modules (measurement requirements and test methods);
——Changed the technical requirements of pressure loss and changed the pressure loss level from Δp63 to Δp10, Δp16, Δp25, Δp40, Δp63 and several optional levels (general technical requirements);
—— Added technical requirements and test methods for the overload water temperature of the temperature class T50 meter (measurement requirements and test methods);
——Adjust the order of the durability test of the water meter of Q3 ≤ 16m3/h. The intermittent flow durability test precedes the continuous flow durability test (general technical requirements and test methods);
- Removed the technical requirements and test methods for enclosure protection;
- Increased the type inspection and test methods of the inspection device;
- According to the provisions of JJF1015-2014, the requirements for the description of key components and materials of the water meter and the requirements for sample processing after the type evaluation has been added.
[China Instrument Network Instrument Standards] On May 11, the National Traffic Capacity Measurement Technical Committee issued the "Cold Water Meter Type Evaluation Program" (Draft for Comment) and began the second time for comments.