Elektropneumatischer Signalumformer

摘要

An electro-pneumatic converter device with modular components and with supporting housing structure enabling the device to be readily convertible from a current to pressure positioner to a current to pressure transducer. A valve positioner with an enclosure having a housing (202), a modular base (206), and a separable field terminal box (204). A self contained cover (208) mounted to the enclosure with no additional mounting components. A plastic pneumatic relay (48) ultrasonically welded together to eliminate metal mounting parts and lower assembly time. Open channels in a housing surface (282) cooperating with a gasket (310) to provide fluid passageways between the housing (202) and the modular base (206). Pressure gauges (264, 266) are removably mounted on a modular unit (206) for location completely within the housing. A floating interconnect terminal board (244) permits self-aligning of mating terminals as the modular unit is inserted into the housing. A supply biased pneumatic pressure relay (48) has supply pressure channeled to the supply port (126) and also to a supply bias cavity (162) through a capilliary hole (164).