Abstract: A water monitor for a toilet flush tank includes a sensing system and an alarm system. The sensing system includes a tube having a constricted aperture in the base. The tube is normally filled with water. When the flush tank is emptied water begins to drain slowly from the tube. A float in the control tube responds to the water level in the tube. A contact attached to the float closes contacts on the control tube if the flush tank does not refill. The closing of the contact is used to trigger an alarm signal. The monitor includes a self cleaning drainage aperture for the control tube and a flexible mounting belt which provides for simple mounting and adjustment.

Abstract: A washing machine overflow prevention device for use with an automatic washing machine and a conventional fixed drain conduit. The device includes a float switch adapted to be removably positioned below the drain hose of the washing machine within the drain conduit and to be actuated from a normally open to a closed mode when the water level backs up to a predetermined level in the drain conduit. The float switch comprises an elongated protective cover thereover defining a first closed end positioned proximal to the top of the drain conduit and a second open end positioned distally to the top of the drain conduit to protect the float switch from waste water flowing thereover from the washing machine drain hose.

Abstract: The gauge has an outer tube sealed at its lower end and adapted for attachment to the top wall of the tank, and an inner tube axially movable within the outer tube. A float encircles the outer tube and moves freely therealong. First and second magnets respectively attached to the float and to the lower end of the inner tube provide magnetic coupling therebetween so that a rising liquid causes the inner tube to rise with the float. Magnets within the inner tube operate a switch to signal when the first and second magnets are in position for magnetic coupling therebetween. Another magnet is fixed by a set screw to the outside of the inner tube in position for operating the switch when the tank is substantially full. Retaining clips are also disclosed for holding the latter magnet in place.

Abstract: The invention is an electronic sensor for producing an indication of fluid level in a hose or tube and an electronic indicating circuit that uses the sensor's indication of fluid level for asserting one of three indicators depending upon whether the fluid level is above a reference by a small distance, within the small distance of the reference, or below the reference by the small distance. A float retaining a core having a relative magnetic permeability significantly greater than one is supported by fluid near three vertically disposed coils. The center coil is excited by a source of alternating current and the position of the core above or below the center coil determines the voltages present in the top and bottom coil. The voltages present in the top and bottom coils are rectified and added in polarity opposition to produce an indication of fluid level. A plurality of voltage comparators, supplied by the indication of fluid level and fixed voltages, are used to assert the appropriate indicator.

Abstract: A liquid-level detecting structure includes a housing disposed in a tank in proximity to a wall surface of the tank, a float disposed inside the housing and adapted to be moved by the liquid which has entered the housing, and a passage provided for introducing the liquid into the housing and having an opening facing the wall surface of the tank. When acceleration has acted toward the wall surface of the tank with the liquid level being close to a minimum level, the liquid is biased toward the wall surface. Accordingly, the opening of the passage is immersed in the liquid, preventing the float from being further lowered. Meanwhile, when acceleration has acted toward a wall surface opposite to the adjacent wall surface, this acceleration is oriented in an opposite direction to the direction in which the liquid flows out of the opening of the passage, so that the liquid in the housing is prevented from flowing out of the passage.

Abstract: A level indicating assembly for use in a tank mounted in a vehicle, such as an RV or boat, includes a fitting body for mounting the assembly in the top of the tank, and probes extending through the body into the tank. At least one of the probes has a hollow probe shaft which is of a flexible material such as flexible pvc. One of the probes provides an "empty" indication for the tank, while the other probes provide a "full" indication, and a mid-level indication. A socket or like element with a knock-out plug optionally provides a vent in the fitting body. During installation the position of the probe shafts with respect to the fitting body are adjusted, and any unneeded portion of the probe shaft above the shaft fitting is cut off.

Abstract: A linear sensing device containing an electrically conductive reed strip which, in the presence of an external actuating horseshoe magnet, makes electrical contact to a resistive strip at the location of that magnet. The conductive reed strip is attached along one end to a supporting member, formed from a material with coefficient of thermal expansion similar to the reed strip, to prevent warping of the reed strip over a range of environmental temperatures. The sensing device is of a modular construction with elongate cap, to which the resistive strip is attached, and an elongate base, to which the reed strip support member is attached. The cap and base mate together to form an inner container which then slides into an outer container.

Abstract: A fluid level maintenance sensor or use in a tank test system and which includes an upper sensor coil and a lower sensor coil mounted on a level sensing tube. A float carrying a ferromagnetic ring is operatively mounted in the level sensing tube which causes a fluid transfer signal to be generated when the float and ring are moved upwardly or downwardly to transfer fluid out or into the level sensing tube to maintain a selected fluid level in the tube.

Abstract: A reservoir, provided with a device for warning when the level of an operation fluid to be supplied to a fluid pressure master cylinder drops below a given level, comprises a fluid tank for storage of the operation fluid and a float chamber with an upper wall provided on the side portion of the fluid tank. A reed switch for the fluid level drop warning device is provided at the lower portion of the float chamber, and a float having a magnet is retained in the float chamber. A partition for restricting the movement of the float is detachably mounted at the communicating section between the fluid tank and float chamber. This arrangement facilitates the mounting and replacement of the float and reed switch.

Abstract: An oil level sensing apparatus has a body which defines a volume having an open bottom. A float in the volume supports a permanent magnet and moves within the volume in accordance with the oil level therein. A reed-switch is affected by the magnet supported on the float to detect a low oil level. A temperature sensitive plate closes the open bottom of the volume at low temperatures in order to prevent false readings. Additionally, in order to prevent false readings during transient oil level fluctuations at higher oil temperatures, a spring opposes the opening of the plate such that a restriction is formed in the path for draining oil from the volume. This delays the oil drainage from the chamber and any resulting low oil level signal.

Abstract: In a hydraulic reservoir of a master cylinder for vehicle including: a main body having an internal space for storing brake fluid; a float provided with permanent magnet, so arranged as to be vertically movable in the internal space of the main body; a reed switch attached to the outside surface of the main body, the reed switch being actuated by magnetic force of the permanent magnet, when the float with permanent magnet is positioned under a predetermined level; and a hollow for attaching the reed switch to the outside surface of the main body, the reed switch is supported by a support member in the hollow, a rubber bush is tightly and elastically fitted to the inside wall of the hollow and a fixing member is so fitted to the hollow as to push the rubber bush to the support means, terminals of the reed switch being inserted tightly through holes of the rubber bush whereby the reed switch is held in the hollow.

Abstract: A drain overflow alarm for a washing machine drain, which alarm is mounted in a vertical drain line offset provided with a check valve and extending from the vertical fixed drain line or standpipe of a structure. In a preferred embodiment the alarm includes a float switch located in the top end of the drain line offset and a transformer, relay, alarm and optical reset button, all provided in a control housing. The float switch is electrically connected to the transformer, relay and alarm, such that obstruction of the fixed drain line causes water to rise in the fixed drain line and through the check valve into the drain line offset. The rising water raises the float element of the float switch and closes the switch to activate the transformer relay and alarm, as well as terminate operation of the washing machine.

Abstract: A liquid level response electrical switch assembly responsive to the level of a monitored liquid is shown as having a body and a chamber-like or containment portion, electrical conductors are carried by the body for connection to as associated electrical load, a reed switch is carried by and within the body for opening and closing an electrical circuit through the electrical conductors, and a magnet positioned by a buoyant float responsive to the level of the monitored liquid is effective for actuating the reed switch.

Abstract: An apparatus for providing a signal to indicate liquid level above a pre-determined level in a container. The apparatus includes a device for defining a fixed reference level. An alarm unit having an alarm and an alarm actuator is connected to the defining device. A float is connected to the alarm unit and rests on the surface of the liquid. The float actuates the alarm actuator to activate the alarm when the surface of the liquid reaches the pre-determined level.

Abstract: A liquid level indicator for storage tanks including a cover member for covering an opening at the top of the storage tank, a central rod extending downwardly from the cover member into the storage tank, and a float movably disposed on the central rod. A vertically movable first rod assembly is connected to an upper portion of the central rod, and a vertically movable second rod assembly is connected to a lower portion of the central rod, with the float being disposed therebetween so that the float contacts and moves the first rod assembly when the storage tank is substantially filled, and the float contacts and moves the second rod assembly when the storage tank is near empty. Switches are associated with each of the first and second rod assemblies to activate signal members when either of the first and second rod assemblies are vertically moved to indicate when the storage tank is substantially filled or when the storage tank is near empty.

Abstract: A cylindrical alarm-functioned accessory device for intravenous infusion procedure comprising a cylindrical body connected through a drip tube to receive fluid from a fluid bottle thereinto, an enclosed cylindrical float which senses the condition of a fluid pool formed in the cylindrical body, and a contact-type switch extending into the cylindrical body with connection to a sound and light alarm assembly. As the bottled fluid drains, the cylindrical float descends according to the descending of the fluid pool, pressing against the contact-type switch to activate the alarm assembly.

Abstract: An alarm kit for notifying a user of a noncommercial water purification system that the level of liquid with the chemical tank of the system is below a predetermined level includes a float, a housing, an alarm, an activation device and a connection member. This alarm kit can be easily installed by a homeowner or other user of the system and will allow the user to avoid complete depletion of the liquid from the chemical tank. The float either floats on top of the liquid or is submerged therein and will cause movement of the connection member when the liquid level drops below the predetermined level. The connection member will then pivot an arm of the activation device to cause the alarm to be activated in order for the user to be alerted that the liquid within the tank needs to be replaced. The predetermined level is determined by the usual rate of withdrawal of liquid from the tank and the usual time required to replenish the fluid, such as the response interval of a vendor to a request for service.

Abstract: A disposable container for shipping a hazardous or ultra-high purity liquid material is disclosed, having a body of substantially vapor-impermeable organic polymer material, such as fluorinataed linear high-density polyethylene, a bubbler tube extending from the top of the container having an open end near the bottom of the container, a liquid level detector, and an outlet tube on the top of the container having an open bottom end near the top of the container. A vapor-impermeable metal coating is provided on the outside of the container by vapor deposition or sputtering. A frangible seal is provided at the top of both the inlet tube and the outlet tube. A metal-coated polymer valve is provided on the bubbler, having vapor-impermeable seals isolating the metal exterior from the metal interior, and also having means for rupturing the frangible seal.

Abstract: In a device for monitoring the liquid level in a tank, utilizing a reed switch projecting into the tank in an internally cylindrical hollow rod and a float provided with a permanent magnet and guided on the hollow rod, the reed switch is constructed as an independent exchangeable part introducible into the hollow rod with an accurate fit and with a small assembly outlay. The slide-in part has three radially resilient abutment zones distributed uniformly around the circumference. In order to accurately introduce the slide-in part into the hollow rod, with a minimum of force, three axial guide grooves associated with the resilient abutment zones are formed radially outwards in the inner envelope surface of the hollow rod. In order to achieve the final accurate fit, the slide-in part, introduced completely into the hollow rod, is rotated until the resilient abutment zones are located in regions between the guide grooves of the hollow rod.

Abstract: A sewer alarm is provided for warning of overflow conditions in a house trap installed in a sewer line, the sensing mechanism consisting of a magnetic float switch with no moving parts other than the float itself and with the magnetic activating switch sealed from the hostile environment found in a house trap. The alarm cap member housing the magnetic float switch has physical dimensions similar to a typical cap installed in an unalarmed house trap and substantially has only wires protruding from its exterior face.

Abstract: An alarm device for dripping injection comprising a floating barrel which vertically moves up or down according to fluid volume in the dripping liquid barrel, a touch switch and sealing means which are provided in the upper area of the lower part of dripping liquid barrel, a socket which is provided in the dripping liquid barrel lower part for connection to touch switch, and a power lead and plug provided by a separate action box or a patient room's call assembly to plug the socket. As the contained fluid is used near empty and the fluid volume in the dripping liquid barrel diminishes meantime, the floating barrel, when loosing support by the fluid volume, moves down and touches the touch switch with its own weight, thereby conducting open the separate action box or the patient room's call assembly to alarm nurses or hospital orderly to come to handle.

Abstract: The gauge has an outer tube sealed at its lower end and adapted for attachment to the top wall of the tank. The gauge also has an inner tube axially movable within the outer tube. A float encircles the outer tube. Magnets respectively attach to the float and to the lower end of the inner tube, whereby a rising liquid causes the inner tube to rise as well. When the liquid level reaches a predetermined high level, a pencil-type magnet mounted within the inner tube operates a switch in an alarm box mounted in the top of the outer tube.

Abstract: The liquid level sensor comprising a tubular case with an inner surface, a base plate having a wiring and disposed in the case so as to extend lengthwise of the case is disclosed. A switch member is disposed on the base plate and is electrically connected with the wiring. A float is disposed outside of the case and is movable in accordance with a displacement of the liquid surface of the liquid in the reservoir tank. A driving member is disposed on the float so as to drive the switch member. A retaining member is disposed on at least one of the inner surface of the case and the base plate so as to support and secure the base plate in the case.

Abstract: A remote oil tank display apparatus is set forth in combination with an oil tank for the indication of oil tank volume. The sending unit is encased in a hermetically sealed container to prevent oil fume propagation throughout an area. A combination digital and light emitting diode display is set forth and is remotely positioned relative to the oil tank to enable individuals of diminished physical capacity to receive and display information of oil volume remaining in an oil tank. Further, an audio means may be selectively employed in concert with the visual displays to assist individuals of diminished hearing capacity.

Abstract: A water level and temperature detector alarm device and more particularly to an alarm device which includes a buoy type detector to alternately detect water level or water temperature so as to provide an audio alarm signal through a buzzer when water level or water temperature reaches the predetermined range. The detector is connected to the expansible end of a conduit and includes a sleeve having set therein two reed switches and a thermswitch and having mounted thereon a body which includes therein a circular magnet. An alarm device is connected to the other end of the conduit which is having a movable positioning rack mounted thereon for positioning of the whole assembly. Following the rising of water level, the magnet of the buoy alternatively drives the reed switched to turn on the alarm device to buzz or, when water temperature reaches the predetermined range, the thermoswitch will be turned on to drive the alarm device to buzz.

Abstract: A display control apparatus for use in an internal combustion engine includes: a CDI type ignition circuit; an overspeed preventing circuit which can limit the engine speed to a restricted value; a first LED display unit of the light on/off type to display the amounts of oil and/or cooling water; a second LED display unit to display the circulation state of the oil and/or cooling water; and a drive circuit which switches the first and second display units to an alarm display mode and causes the overspeed preventing circuit to limit engine speed when abnormal states of the oil and/or cooling water are detected by oil level switches or by water and oil flow sensors. If power ceases, the display state is held by keep relays. When an abnormal state is detected, the driver is warned by lighting up of red LEDs and by generating a beeping sound from a buzzer.

Abstract: A signalling device for signalling danger from water over a low water crossing area is provided. The device has a support post, a message panel, and flashing lights in electrical connection with an energy source, the electrical connection being completed by triggering a switch lever by either a tank float rigidly mounted to a bottom end of a centrally disposed elongate guide member or by a donut-shaped tank float received about the elongate guide member and stopped by a stop member, either the rigidly mounted float pushing the elongate rod upwards and triggering the switch lever, or the donut shaped tank float and stop pushing the elongate rod upwards and triggering the switch lever.

Abstract: A liquid level control in a refrigeration system operates a solenoid valve to maintain the level of liquid refrigerant in a vessel within a range defined by predetermined lower and upper liquid levels, sounds an alarm if the upper level is exceeded and stops a pump if the lower level is violated. The control comprises a float assembly and a switching assembly. The float assembly comprises a float chamber connected to the vessel, a float ball therein, a vertically extending float rod connected to the float ball and movable along a vertical path, and a pair of spaced apart stop members on the float rod disposed within the switching assembly. The switching assembly comprises a switch actuator permanent magnet, having magnet poles at opposite ends, slidably mounted on the float rod between the stop members and movable thereby along the said path.

Abstract: A system and sensor for remotely monitoring the state of the condition of the electrolyte within each of the battery cells of a power supply is disclosed. The system includes a sensor having a dual ball-float and track arrangement for shuttering a pair of light sources and so as to independently detect and differentiate predetermined low electrolyte specific gravity and a low level of the electrolyte. Two multiplexing units receive the sensor signals and display separate indications of each battery and the states detected. The detector uses a gravity responsive ball disposed within a track that shutters one light source at a predetermined low specific gravity and a second level responsible ball within a second track located above the gravity track and ball. The level ball has a specific gravity which is less than that of the specific gravity responsive ball and shutters the second light source at a predetermined low electrolyte level independently of changes in the specific gravity of the electrolyte.

Abstract: Apparatus for detecting the level of a liquid. A metal-detecting proximity sensor is placed near a non-metallic, vertically-positioned guide shaft. A float is placed on the liquid. A tube has one end attached to the float and the other end insertably placed within the guide shaft. A piece of metal is placed within the tube. When the apparatus is used for determining when the level of the liquid reaches a predetermined value, the metal piece has a boundary which is located at the height of the proximity sensor only when the liquid level is at its predetermined value. When the apparatus is used for measuring the level of the liquid, the proximity sensor has an output signal proportional to the distance from itself to metal and the metal piece has an outer surface whose distance to the proximity sensor at the height of the proximity sensor, changes with changes in the liquid level.

Abstract: A disposable container for shipping a hazardous or ultra-high purity liquid material is disclosed, having a body of substantially vapor-impermeable organic polymer material, such as fluorinated linear high-density polyethylene, a bubbler tube extending from the top of the container having an open end near the bottom of the container, a liquid level detector, and an outlet tube on the top of the container having an open bottom end near the top of the container. A vapor-impermeable metal coating is provided on the outside of the container by vapor deposition or sputtering. A frangible seal is provided at the top of both the inlet tube and the outlet tube. A metal-coated polymer valve is provided on the bubbler, having vapor-impermeable seals isolating the metal exterior from the metal interior, and also having means for rupturing the frangible seal.

Abstract: To improve the denseness of a reservoir telltale sounding device of a reservoir for a hydraulic brake system, while reducing the costs of manufacture and assembly, the plug portion comprises a first face and a second face which are respectively connected, in liquid-tight manner, to the housing of the reservoir telltale sounding device and the cover.

Abstract: Disclosed is a device for indicating the filling level in a fluid reservoir of a hydraulic brake system, wherein a magnet is arranged in a radial recess of the float with the side walls of the recess being provided with retaining means for securing the magnet in its installed position.

Abstract: An improved rain gauge in which a large rain collector feeds collected rain into a receptacle having 1/5 the cross-sectional area, and in which a float and counterweight connected by a flexible strand passing over a pulley mechanism creates electrical impulses with each 1/100 inch of rainfall added to the receptacle, and in which the receptacle is periodically emptied by a syphon device of generally U-shaped contour providing intake leg and discharge leg, wherein complete emptying of the syphon tube is facilitated by incorporating within the discharge leg thereof a small diameter tube closed at the top end, open at the bottom end, and having a plurality of small holes spaced longitudinally thereof, whereby air entering the small tube and passing through the longitudinally spaced holes therein, serves to equalize air pressure and permit the full discharge of liquid from the syphon tube.

Abstract: A reservoir, for retaining liquid such as coolant of a radiator of an automobile comprises a container having an opening and a deep portion. A switch case extends in the container, which has a flange at an end portion and a float cover at the other end portion. The flange is mounted on the periphery of the opening so as to suspend the switch case in the container. A reed switch is contained in the switch case. A float having a device for turning one and off the reed switch is slidably contained in the float cover. A tube extends into the container through the flange, through which tube the liquid is supplied into, and removed from the container. A holder is fixed on the float cover, which holds the tube in a fixed position. The flange of the switch case is positioned such that the tip portion of the tube is located at the deepest portion of the container.

Abstract: A fuel level sensor 16 comprises a vertical member 20 and float 22 wherein said vertical member 20 comprises a steel substrate 26 encased in porcelain 28 with a thick film cermet resistive track 34 deposited thereon. A nickel deposit 36 at the bottom portion of the vertical member 20 facilitates electrical continuity between the substrate 26 and the resistive track 34 such that the substrate acts as a buried conductor enabling proportionality between magnitude of resistance and liquid level while diminishing the likelihood of conductor erosion and float interference.

Abstract: An apparatus for checking the workability of a float assembly used to determine the level of liquid in a vessel is disclosed and comprises: a float extension associated with the float of the float assembly and movable when the float assembly is in working order in response to the movement of the float caused by changing the level of liquid in the vessel; a sensor located in spaced relation to the float extension and acting to provide a signal when the float extension is in a predetermined position; and a checking system capable of being activated to move the foat extension into the predetermined position without regard to the level of liquid in the vessel when the float assembly is workable.

Abstract: A monitor and filler assembly providing an easily observable reading as to the fluid level in a reservoir such as an automatic transmission or crankcase of an automobile. The filler may be integrally formed with the monitor to allow for easy replenishing of the reservoir fluid to ensure proper operation of the automobile.

Abstract: A combination hybrid float switch comprising float support means, float support means including a top and a bottom and an internal tube, the internal tube being sealed with respect to a liquid encountering the float support means. A float means is slidably positioned about the internal tube, the float means including a magnet means, the float means being responsive to the level of the liquid. A circuit board means is positioned within the internal tube and includes a plurality of magnetic reed switches. The reed switches are mounted upon the circuit board, the plurality including a first enable switch, second pump switch and a third alarm switch. The pump switch and the alarm switch are physically aligned in a parallel position above the enable switch, the enable switch and the alarm switch each being modified with one shortened lead, thereby modifying the reaction to a magnetic field. the modified reeds eliminate an otherwise conventionally act of state.

Abstract: Disclosed herein is a Hall-effect liquid level sensing apparatus and method. The device may be mounted on a liquid storage tank and includes at least one float suspended within the tank and floating upon a hollow tube for guidance. The float carries a permanent magnet and a Hall-effect sensor may be reciprocated within the hollow tube to sense the location of the permanent magnet and thereby the location of the float. The device further includes a control device including an optical encoder which enables the device to sense the depth in the hollow tube to which the Hall-effect device has travelled when it senses the height of the permanent magnet. The invention may be used in conjunction with a plurality of floats to determine not only the liquid level but also the level between the liquid and a diverse liquid contained within the same container.

Abstract: The device is of the type comprising a magnet carried by a float and a magnetically actuable electric contact carried by a support element which also performs the function of guarding the float. The most important characteristic of the device is that of providing positioning means which maintain the float constantly centered with respect to the support element during excursions of this latter caused by the hydrostatic thrust exerted by the liquid.

Abstract: Disclosed is a system for sensing the level of a body of liquid within a container. The system includes a shaft secured parallel to a vertical axis of said container, said shaft having a magnetically responsive digital switch. Further provided is a toroidally-shaped reference element situated circumferentially about the shaft and secured at fixed level thereto, the reference element having a magnetic axis which is co-directional with the axis of the shaft. Also provided is a toroidally-shaped measuring sensing element also situated circumferentially about said shaft and vertically above said reference element but without securement thereto, said sensing element having a magnetic axis co-directional with the axis of said shaft and having a polarity of the magnetic axis which is repulsive in relationship to the magnetic axis of the reference element.

Abstract: An automatic alarm device for dripping injection fluid bottle, which is installed in the bottle neck portion, and it comprises of a case body, a buoyant power switching device, a buzzer, and a flashing device.

Abstract: A compensating reservoir for a hydraulic brake system includes an upper part provided with a fill socket and a lower part which is provided with an outlet. The parts are connected with each other in a liquid-tight manner along a separating or joint line. The fluid chamber, which communicates with a filling and supply opening of a brake master cylinder through the outlet, is subdivided into two chambers by a partition wall and contains an auxiliary chamber with a level indicating float. The auxiliary chamber communicates with the fluid chamber. In order to determine the actual fluid level by a float not arranged in the fluid level's areal center of gravity resulting from the shape of the reservoir, the two chambers hydraulically communicate with each other permanently, with the first chamber containing both the auxiliary chamber and the outlet and with the second chamber being closed in a liquid-tight manner.

Abstract: A liquid level electrical alarm apparatus includes a perforated hollow cylindrical sensor housing having upper and lower cup-shaped caps. A cylindrical float contained within the sensor housing contains a permanent magnet near its upper end, effective in closing the contact bars of a reed switch element mounted in the upper cap when the float rises a pre-determined level. The sensor body is suspended by a flexible electrical cable connected to the upper cap. Means are provided for adjusting the length of cable from which the sensor is suspended into a vessel, thereby permitting adjustment of the liquid level which trips the alarm.

Abstract: A water level indicator useful for signalling a plurality of different water levels within a bathtub. The device has clamping means for removably securing the indicator to the tub, a depending float chamber for projecting into the tub and a battery operated sound alarm system. A float and rod assembly are housed within the float chamber. The rod projects through an opening in the top of the indicator and is provided with a plurality of metallic bands which will complete an electrical circuit to sound the alarm.

Abstract: A liquid level indication device including a reed switch activating assembly having a magnet moveable in response to a change in the level of the liquid to effect the closing of the reed switch contact elements when a designated liquid level is reached. The device has a built-in time delay feature to prevent the premature actuation of the reed switch by the magnet should the liquid level in the container only temporarily drop.

Abstract: A liquid level sensing means for use in a tank or the like, adapted to hold a liquid which is partially withdrawn and/or replenished from time-to-time. Disposed within the liquid is a buoyant, upright, hollow reed switch-like float element having a longitudinal axis parallel with the direction of movement of the liquid level within the tank. The switch element is adapted to float upon the surface of the liquid whose level is to be sensed. It is provided with an upper reed and a lower reed, each in alignment with the longitudinal axis of the float element. The upper reed is rigidly secured to the upper end of an envelope of the float element, while the lower reed thereof is spring biasly secured to the lower end of the float element envelope. At a location medially between the upper and lower ends of the float element envelope, there exists an area of overlap between the unsecured ends of the upper and lower reeds respectively.

Abstract: A fluid flow chamber including a housing defining a chamber, a chamber inlet and a chamber outlet for flow of liquid therethrough, a float in the chamber, and a magnet and magnetic position sensor, one of which is carried by the float for movement with the change in liquid level in the chamber, the other of which is fixedly mounted with respect to the housing.

Abstract: An apparatus for stopping an electrically driven watering system in response to rainfall, said apparatus having a float activating a reed switch which is mounted within a rain-catching cylinder, said read switch then activating a relay switch to interrupt the flow of electricity in the system. Also included is a rigid mounting strap and pivot strap permitting the casing of the apparatus to be conveniently removed and the rain-catching system to be emptied by one standing on the ground.