... Features of the introduced series The introduced new generation of intelligent modelAssembled and manufactured in domestic, BELL and SD series ... , H: foot-plate,Control model:L: Two types, switch, switch quantity input, abbreviation: Integral-model and proportional modulating type,4 ... type, 4---20mA inputY: Remote-control type, the switch quantity inputPart-turn type BELL series type(with liquid crystal ...