Water Meters Verification Unit

Our Water Meters Verification Unit operates as a type C inspection body, accredited under UNI CEI ISO/IEC 17020, and is listed in the National Registry of the Italian Union of Chambers of Commerce (Unioncamere). It carries out the metrological verification of water meters to ensure the quality of the measurement of the delivered volume.

We assist operators in verifying compliance with UNI EN ISO 4064 standards during the acceptance phase and in meeting the requirements for periodic verification of water meters with capacities up to 40 m3/h, as specified by Ministerial Decree 93/2017.

The measuring process is automated, using gravimetric determination (weighing) of the water volume that transits through the test circuit, and the constant monitoring of flow and relevant physical variables (temperature, pressure, humidity). This allows us to determine:

• errors in measurement of cold water meters;
• the metrological curve (from 3 up to 12 points);
• repeatability test;
• vertical tests.

The Water Meters Verification Unit provides a modern test bench for water meters, compliant with EU Directives 2004/22/EC and 2021/32/EU (MID) and UNI EN ISO 4064 (OIML R49), with the following technical specifications:

• mechanical or static meters with DN 15 to DN 50;
• flow rates from 3l/h to 320 m3/h (maximum potential; the actual accreditation limit is 40 m3/h);
• modular water circuit with two alternative test lines;
• process control with dedicated management software;
• control panel, command board, and extensive electromechanical instrumentation for flow regulation;
• weighing system with calibrated digital scales according to ISO/IEC 17025:2017 (measurement range from 1 kg to 3,000 kg, sensitivity 0,001 kg);
• calibrated sensors (thermometers, water pressure sensors, weather station).