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Liquid Meters

Working Group 1.51

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If liquids are sold or accepted in the course of trade, they are subject to legal control in accordance with the Measures and Verification Act [1] and the Measures and Verification Ordinance [2]. All tasks associated with PTB in this context - conformity assessment and / or certification of the corresponding measuring instruments, regulation and standardization committee work as well as consulting - are dealt with in working group 1.51 "Liquid Meters".

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Research/Development

The focus of the work of working group 1.51 is in the area of legal metrology. Research and development activities are covered by the working groups 1.52 and 1.53.

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Services

Conformity Assessment and Certification

PTB is a notified body for the European Measuring Instruments Directive 2014/32 / EU. Working Group 1.51 is responsible for the conformity assessment of measuring instruments of Annexes III (water meters) and VII (measuring systems for liquids other than water) of the Directive.

In addition, the tasks of the working group include the conformity assessment of nationally regulated measuring instruments for liquids at rest, fuel dispensers for high-pressure natural gas and additional equipment to measuring instruments according to the Measures and Verification Ordinance

 

Calibration of pipettes

Furthermore, working group 1.51 is responsible for the realization and dissemination of the volume of liquids at rest. As part of the international harmonization of liquid measurements, comparative measurements are also carried out by means of static volume standards (calibration flasks and pipettes).

The working group's pipette test bench uses distilled water and is designed for volumes between 1 l and 50 l. The extended measurement uncertainty of the test stand of 0.004 % has been repeatedly verified by international comparisons.

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Information

The standards listed below, recommendations of the International Organization for Legal Metrology (OIML) and Guides of the European Organization for Legal Metrology (WELMEC), regulate the technical specifications and test requirements for the essential and meter specific requirements for water meters and for measuring systems for the continuous and dynamic measurement of quantities of liquids other than water:

 

 

  • OIML R49-1 "Water meters for cold potable water. Part 1: Metrological and technical requirements“ (2013 E)
  • OIML R49-2 "Water meters for the metering of cold potable water. Part 2: Test methods“ (2013 E)

 

 

  • DIN EN ISO 4064 "Water meters for cold potable water. Part 1: Metrological and technical requirements“ (2014)
  • DIN EN ISO 4064 "Water meters for cold potable water. Part 2: Test methods
  • DIN EN ISO 4064 "Water meters for cold potable water. Part 5: Installation requirements“ (2014)

 

 

  • OIML R 117-1 "Dynamic measuring systems for liquids other than water. Part 1: Metrological and technical requirements" (2007 E)
  • OIML R 117-2 "Dynamic measuring systems for liquids other than water. Part 2: Test methods" (2014 E)

 

 

 

The relevant normative-technical documents for liquid meters at rest, high-pressure natural gas fuel dispensers and ancillary equipment are:

 

 

  • OIML R 71 "Fixed storage tanks. General requirements“ (2008 E)
  • OIML R 80 "Road and rail tankers with level gauging”. Part 1: Metrological and technical requirements (2009 E)
  • OIML R 85 "Automatic level gauges for measuring the level of liquid in stationary storage tanks”. Part 1: Metrological and technical requirements (2008 E)
  • OIML R 85 "Automatic level gauges for measuring the level of liquid in stationary storage tanks”. Part 1: Metrological control and tests (2008 E)
  • OIML R 139-1 "Compressed gaseous fuel measuring systems for vehicles. Part 1: Metrological and technical requirements“ (2014 E)
  • OIML R 139-2 "Compressed gaseous fuel measuring systems for vehicles. Part 2: Metrological controls and performance tests“ (2014 E)

 

 

  • WELMEC 7.2 "Software Guide“ (2015)

 

 

  • PTB-Anforderung PTB-A 4.2 "Lagerbehälter und deren Messgeräte“ (12/2010)
  • PTB-Anforderung PTB-A 4.3 "Transport-Messbehälter“ (2/1994)
  • PTB-Anforderung PTB-A 4.5 "Volumenmessanlagen mit Transport-Messbehälter und elektronischer Füllstandsmessung“ (12/2002)

 

[1] Measures and Verification Act of 25.07.2013

[2] Measures and Verification Ordinance of 11.12.2014

[3] Directive 2014/32/EU of the European Parliament and of the Council of 26 February 2014

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