Smart card controlled supply of energy supply to a building has a controller that compares credit amount on the card with the output of supply meter

摘要

The metering system for the supply of energy to a heating system in a building has a housing with a built in reader (1) for smart cards. This provides input to a controller (2) that operates a supply valve (3). The amount used is measured (4) and fed back to the controller. When the credit amount is reached the valve closes.