How zero-leak synthetic diaphragms and magnetic drives achieve EN 1359 & OIML R137 Class 1.5 accuracy.
Four measuring chambers separated by synthetic rubber-coated diaphragms. Precise displacement of 1.2 dm³ per revolution yields uncompromised linearity.
Magnetic coupling transfers mechanical crank rotation to the index counter through a hermetically sealed wall, eliminating shaft stuffing box leaks.
Reverse-flow stop pawl locks registry if reversed. Lead wire sealing applied under Government Approved Test Centre (GATC) for Gas Meters supervision.