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Best Practice: National Institute of Metrology

Best Practice: National Institute of Metrology

Best Practice: National Institute of Metrology

Product catalog summary
Introduction
The National Institute of Metrology (NIM) in Beijing was tasked with establishing a system to document individual hot water consumption. This required a calibration system using flow and temperature measurements to determine usage, with a precise weighing solution implemented for various capacities.
Application
Minebea Intec developed a high-resolution weighing solution for measuring water mass with capacities of 60 kg, 600 kg, and 6,000 kg.
Products
  • IS digital weighing platform with IP67 rating
  • Weight indicators Combics 3 with IP69K rating
Customer Benefits
  • High accuracy and repeatability (+/-2 d)
  • High IP rating for harsh environments
  • Quick and easy built-in calibration and adjustment
Customer Background
The National Institute of Metrology in Beijing, founded in 1955, is China's technical center for legal metrology. It supports economic growth and social sustainability by providing accurate measurements. The institute was tasked with finding a solution when the Chinese government decided to charge citizens for heating based on consumption.
Best Practice
In 2010, China adopted new criteria for utility billing, shifting from surface area to hot water consumption. A 1,800 m² laboratory was constructed with a 20 million RMB investment to support the installation of three million water meters annually. The calibration system needed to analyze flow and temperature, maintaining uncertainty below 0.1% and supporting a maximum flow rate of 600 m³/h.
Technical Solution
Minebea Intec provided high-resolution scales with IS weighing platforms using Electromagnetic Force Compensation Technology (EMFC). The scales, made of high-quality stainless steel with IP67 ratings, were connected to Combics 3 weight indicators with IP69K rating and RS485 serial interface. This setup allowed for a resolution of 600,000 d, exceeding the required 120,000 d.
Project Goal and Implementation
The project aimed to provide accurate weight readouts and easy integration into the customer's application. The large displays of Combics 3 weight indicators ensured excellent visibility even in unfavorable conditions.
Conclusion
The new facilities enhance heat meter calibration and showcase the quality of Minebea Intec's products, as noted by Mr. Zhang Lihe from NIM, Beijing.
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Catalog excerpts

Best Practice: National Institute of Metrology-1

Best practice Minebea Intec stepped in when China changed its policy on charging for heating consumption When the Chinese government decided to charge its citizens for heating on a consumption basis, the National Institute of Metrology in Beijing was required to find a solution. Key facts The National Institute of Metrology in Beijing was faced with the task of laying the foundations for documenting the hot water consumption of individual users. The new calibration system was to employ flow and temperature to determine usage. A precise weighing solution for different capacities was successfully implemented. Minebea Intec developed a weighing solution with high-resolution scales for the measurement of water mass, with capacities of 60 kg, 600 kg and 6,000 kg. Products digital weighing platform IS with IP67 rating Weight indicators Combics 3 with IP69K rating Customer The National Institute of Metrology in Beijing is China’s technical centre of legal metrology. It was founded in 1955 as a non-profit institution with the purpose of providing accurate, reliable and traceable measurements to support China’s economic growth and social sustainability. Customer benefits High level of accuracy High IP rating for rough operating environments +/-2 d repeatability Quick and easy built-in calibration and adjustment feature/functio

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Best Practice: National Institute of Metrology-2

Project goal and implementation In 2010, the Chinese government adopted new criteria to calculate utility bills, moving away from using the surface area of dwellings to instead charge on a hot water consumption basis. Resolution higher than 120,000 d High IP ratings for adverse environment conditions Digital displays with inherent communication interference The solution Minebea Intec proposed was the range of For that purpose, 20 million RMB (about €2.5 million) was high-resolution scales with IS weighing platforms, which is invested for the construction of a 1,800 m² laboratory. The based on...

 Open the catalog to page 2

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