Secure electronic meter measuring heating costs, has casing with front and rear sections, with switch on printed circuit board to detect opening of casing

摘要

The meter (1) has front and rear sections (3a, 3b) forming a sealed casing (2) which contain the circuit board (4). On the front (18) of the board, two spaced contact surfaces (26) are electrically-connected by a disc (15) on a spring section (25) when the front of the casing is raised up from the rear.