Structure of fluid level controller of piping type

Claim 1

A pipe joint type fluid level controller for a tank, comprising: a plurality of joint pipes connected in series to form a pipe assembly; a plurality of reed elements disposed within a plurality of sleeve members and sealably arranged within said joint pipes and in direct abutting relationship with one another, each reed element having a single reed switch contained therein, a conductor connected to a common terminal of said reed switch and a conductor connected to an active terminal of said reed switch; a single magnetic floating member sleeved on said pipe assembly and slidable from one end to the other end thereof; a main control circuit connected to said reed elements and comprised of at least one latching relay and at least one fluid controller, said main control circuit comprising a plurality of conductors, latching relays in quantity one less than the quantity of said reed elements, and fluid controllers in quantity equal to said latching relays, said latching relays each comprising two coils, said coils respectively having a first terminal connected in series with said common terminal of said reed switches for further connection to a power supply and a second terminal connected with at least one active terminal of said reed switches, and each said latching relay is respectively connected to one fluid controller; wherein said main control circuit performs fluid level control operation by alternatively turning its respective fluid controller on and off in response to said magnetic floating member following a fluid level by moving up and down along said pipe assembly and alternatively turning said reed switches on and off and wherein the number of said joint pipes and said reed elements are changed to control a different number of level steps with an equal number of controlling reed elements to accommodate different size tanks.