Inmetro satisfied with centralized metering systems


Brasilia, Brazil — (METERING.COM) — January 30, 2009 – Brazil’s national metrology body Inmetro (Instituto Nacional de Metrologia, Normalização e Qualidade Industrial) has completed what it regards as a satisfactory inspection of 1,305 centralized metering systems in and around Rio de Janeiro, finding that 95 percent of the meters were performing satisfactorily.

The sample of meters, located in Duque de Caxias, São Gonçalo, Niterói, Itaboraí and Magé, is representative of a universe of 300,000 systems installed by Ampla in homes and other establishments in its concession area within the state of Rio de Janeiro. The objective of the inspection was to monitor the performance of these meters.

The centralized metering system comprises a meter mounted outside the home, usually in a group of a number of meters, and a customer information terminal within the home.

The installed systems were developed by CAM and Landys+Gyr, and were installed by Ampla from May 2005 onwards. The inspections were undertaken by Inmetro from September 2007 to December 2008.

Of the inspected meters, 65 meters – five percent – were found to have a measurement error greater than the maximum permissible 4 percent. Of these 33 meters were polyphase meters, out of a total of 182 polyphase meters in the sample. As a result Inmetro has temporarily suspended the use of such meters until Ampla has been able to rectify the problem and the meters have been re-inspected.

The technological innovations brought by the centralized metering system led Inmetro in September 2007 to amend Ordinance 371. In terms of the Ordinance meters already in use can continue to be used, as long as they function within the admissible margin of error. However, any new meters to be installed must meet the new requirements of the Ordinance. So far no manufacturers have obtained any approvals, but with the granting of an approval the way will be open to install centralized metering throughout the country.