Legacy Meters, specifically Legacy Electricity Meters, are those meters which do not communicate remotely; and were traditionally thought of as being that metering that existed in NZ before the advent of the “smart meter”.
They are the meters which have traditionally been read by meter readers visiting the site to read them.
Legacy meters fall into two broad groups, electro-mechanical induction meters and electronic meters.
- The electromechanical induction meters operate by counting the revolutions of a metal disc which rotates at a speed proportional to the power passing through the meter. The number of revolutions is thus proportional to the energy usage.
- Electronic meters do not have any moving parts (other than some that utilise a rotating drum-register of numbers for the ‘reading’) and typically use special hardware and circuitry to record the electricity usage. The electronic meters display the readings either on a rotating dial (like some electromechanical meters) or on an LCD screen.
Traditional Legacy meters do not have the facility to be remotely contacted, or send data. In contrast, advanced (smart) meters typically have two-way remote communications and are normally continuously connected to a communications network.