Abstract: An improved lower cost sight glass and a method for producing the same is disclosed, whereby the sight glass is made by placing a transparent component in secure contact with a metallic ring. The contact may optionally be effectuated by temporarily altering the relative dimensions of the metallic ring and the transparent component, placing the transparent component into the inner space of the metallic ring, and then reversing the altered relative dimensions of the metallic ring and the transparent component. A hermetic seal is formed between the transparent component and the metallic ring is by the application of an inorganic sealing compound.

Abstract: An optical configuration suited to the monitoring of a process flow through the wall of a containment vessel for producing a high-quality, high-NA sample focus and reduced residual positive spherical aberration. The invention includes an optical path with a window extending through, and sealed to, the wall of the containment vessel, and an optical surface disposed in the optical path associated with minimizing aberration, increasing numerical aperture, or both. The window has a surface facing into the process flow and a surface facing away from the process flow and, the surface facing away from the process flow is associated with minimizing aberration or increasing numerical aperture. A lens is disposed outside the containment vessel and in the optical path, with the surface of the window facing the lens being substantially spherical. With such an arrangement, the light rays of the optical path are generally normal to the surface of the window facing the lens.

Abstract: An armored sight gauge assembly of the type having a sight tube that is placed between first and second spaced apart fittings to show a liquid level comprising an elongated main body positioned between and permanently connected to the first and second fittings. The main body incorporates a flanged U-shaped frame member to which there is removably affixed a transparent sight tube shield. A sight tube assembly substantially surrounded by the flanged U-shaped frame member on three sides and is insertably captured by the first and second fittings. A valve assembly and ball check shutoff is incorporated within the internal portion of each of the first and second fittings as is a misalignment union which is removably attached to each fitting.

Abstract: A washing agent dispenser is described, for a household washing machine, namely a dishwasher, said dispenser including a tank for containing a liquid washing agent, to which a device is associated for the visual control of the level of said liquid washing agent. According to the invention, said control device has a plurality of elements of a substantially transparent material, which are inserted in respective passages extending between said tank and the outside of the body of the dispenser. The parts of each one of said transparent elements which are visible outside said body form the steps of a scale indicating the level of said liquid washing agent contained in the tank.

Abstract: An improved fluid level verification apparatus for use on liquid filled containers and configured to reduce inherent mechanical stresses on the inspection tube and resist leakage due to environmental, chemical, thermal or mechanical expansion cycles by using a protective shield member to encase the inspection sight member, and, also, a method for permanently sealing the fluid level detection apparatus.

Abstract: A gauge includes a translucent tube assembly having metallic tubular end segments. The end segments are endwise embedded within the ends of the translucent tube and permit dispensing with packing when joined to shut off valves at the ends of the tube assembly. The shut off valves are in communication with vertically spaced apart ports in a liquid storage tank. Liquid level in the tube assembly corresponds to the level liquid in the storage tank.

Abstract: An observation window of a hyperbaric oxygen chamber includes a frame, and a transparent member. The frame is fixedly joined to a wall of the chamber. The frame includes an outer annular connecting portion, and an inner annular holding portion, which is encircled by the outer portion, and which defines a central observation hole; an annular space is formed between the connecting portion and the holding portion to help reduce effects of deformation of the connecting portion on the holding portion so that the transparent member can still be fitted into the holding portion with precision after solder welding is used to secure the frame in position. An O-shaped ring is fitted between the transparent member and the holding portion to prevent compressed gas inside the chamber from leaking and to prevent the transparent member from falling off the frame.

Abstract: A redundant level measuring system comprises a chamber for fluidic coupling to a process vessel whereby material level in the vessel equalizes with material level in the chamber. A float including a magnet in the chamber rises and falls with material level in the chamber. A magnet actuated visual indicator is mounted to the chamber for indicating level of the magnet in the chamber. A measurement instrument includes a probe and a measurement circuit. The instrument is mounted atop the chamber with the probe extending downwardly into the chamber. The measurement circuit measures a characteristic of the probe representing level of the material in the chamber. A shield in the chamber isolate the float from the probe.

Abstract: A sight glass apparatus has a liquid level indicator for identifying the level of a clear to slightly translucent liquid in tube by a change in color of the indicator. The indicator has a transparent body with a convex lens, and a concave lens at opposite ends of the body, and V-grooves open to opposite sides of the body. A moisture indicating medium on the body functions to identify the presence of water in refrigeration and air-conditioning systems.

Abstract: An oil-gauge for the axle-end of a vehicle includes a transparent or translucid lid (15) for inspecting the level of oil in a chamber (13) housing the wheel-mounting bearings. A disk partition (23) is bolted to the inside of the lid to form a shallow subchamber (25). The disk is provided with orifices for oil level in the subchamber to follow the oil level in the main chamber. The visible surface (29) of the disk is painted white and the subchamber houses one or more loose elements (31) to wipe the inside of the lid clean.

Abstract: An inner combustion chamber access door member for a fuel-fired water heater has main and pilot burner structures respectively supported thereon by gas supply tubes sealingly extending through and anchored to the door member, and is further provided with a wire pass-through tube and a sight glass opening. After the door member has been externally secured to a side wall portion of the water heater over an access opening therein, with the main and pilot burner structures disposed in the combustion chamber of the water heater, a lighting wand is extended through the sight glass opening to light and test the burners. Subsequently, a sight glass structure is snapped into the sight glass opening to complete the installation of the door/burner assembly. Thermocouple and igniter wires extend through the pass-through tube, and are sealed therein by a laterally split resilient cylindrical sealing plug member.

Abstract: An inner combustion chamber access door member for a fuel-fired water heater has main and pilot burner structures respectively supported thereon by gas supply tubes sealingly extending through and anchored to the door member, and is further provided with a wire pass-through tube and a sight glass opening. After the door member has been externally secured to a side wall portion of the water heater over an access opening therein, with the main and pilot burner structures disposed in the combustion chamber of the water heater, a lighting wand is extended through the sight glass opening to light and test the burners. Subsequently, a sight glass structure is snapped into the sight glass opening to complete the installation of the door/burner assembly. Thermocouple and igniter wires extend through the pass-through tube, and are sealed therein by a laterally split resilient cylindrical sealing plug member.

Abstract: A system for returning residual liquid remaining in a loading line to a liquid cargo container after loading or unloading of the cargo container. This system includes a liquid return line extending between the loading line and the cargo container. A pump is positioned to move liquid from the loading line, through the liquid return line, and into the cargo container. A vapor line communicates between a vapor space in the cargo container and the loading line. The system may include an optical liquid level sensor. The level sensor includes a light tube having two substantially straight sections joined by a substantially continuous curvature bend. The bend has a rounded cross-section and the light pipe is formed of a light conducting material. An optical emitter is positioned at the end of one of the straight sections of the pipe and an optical detector is positioned at the other straight section of the pipe. A micro-controller activates the optical emitter and monitors the optical sensor.

Abstract: An improved fluid level verification apparatus which may be manufactured or otherwise fabricated as a kit and assembled at a remote location for use on liquid filled containers and configured to reduce inherent mechanical stresses on the inspection tube and resists leakage due to environmental, chemical, thermal or mechanical expansion cycles by using internal grooves and entrapped o-rings.

Abstract: A redundant level measuring system comprises a chamber for fluidic coupling to a process vessel whereby material level in the vessel equalizes with material level in the chamber. A float including a magnet in the chamber rises and falls with material level in the chamber. A magnet actuated visual indicator is mounted to the chamber for indicating level of the magnet in the chamber. A measurement instrument includes a probe and a measurement circuit. The instrument is mounted atop the chamber with the probe extending downwardly into the chamber. The measurement circuit measures a characteristic of the probe representing level of the material in the chamber. A shield in the chamber isolate the float from the probe.

Abstract: Methods and apparatus for mechanical fluid level monitoring device, which are particularly suited for a water jacket of an incubator are disclosed. The present invention provides a mechanical fluid level mechanism for monitoring water jacket levels in an incubator, including a liquid level gauge having a scale, which is mounted on the incubator.

Abstract: A sight glass assembly for a water heater flame trap and a method of making same is disclosed. A rectangular-shaped sight glass frame casing being comprised of a thin metal plate further comprising a rounded rectangular cut-out window and two metal tabs on opposite sides of the casing acting as a retainer to hold the planar transparent material of the sight window tight to the rectangular-shaped gasket. The metal frame casing of the sight glass assembly attaches to the exterior of the flame trap compartment of the hot water heater by: (a) either inserting the tabs, further comprising metal clips, into the gasket whereby they expand, locking the metal frame casing in place; or in a second embodiment (b) riveting the tabs, now in the shape of a flange, directly to the hot water heater shell. The metal frame casing is formed by a metal stamping procedure that allows for easier and more economic manufacture of the sight glass retainer.

Abstract: An apparatus for indicating a fluid level in a reservoir includes a conduit for communication with a reservoir and including a sight glass. A buoyant primary float is provided within the conduit, and a stop is provided within the conduit for engaging the primary float to prevent travel of the primary float beyond an upper portion of the conduit. A buoyant secondary float in the conduit is moveable together with the primary float when the primary float is not engaged by the stop, and is moveable separately from the primary float when the primary float is engaged by the stop and a fluid level in the conduit exceeds the level of the stop such that a portion of the secondary float may travel separately within the upper portion of the conduit. The secondary float preferable includes an elongate portion that passes through an aperture in the primary float, and a buoyant upper portion that is located above the primary float and is larger than the aperture in the primary float.

Abstract: A viewing port for a medium transfer line has a tubular glass member through which a medium can pass during fluid transfer, a clear plastic barrier surrounding the tubular glass member for containing a glass and a medium in the event of a breakage, and a connection for connecting the tubular member together with the barrier to a medium transfer line.

Abstract: The present liquid level gauge for a liquid holding tank is comprised of a first tube with an inner section positioned inside the tank, and an outer section positioned vertically outside the tank. A larger diameter transparent tube is positioned around the outer section of the first tube, and has a sealed lower end. The outer end of the first tube is open to the interior of the transparent tube. The inner end of the first tube is connected to a bladder positioned at the bottom of the tank. The bladder and the first tube are filled with an indicator fluid. The transparent tube is partially filled with the indicator fluid that flow from the outer end of the first tube. The height of the indicator fluid in the transparent tube is the same as the level of the liquid in the tank.

Abstract: An oil-gauge for the axle-end of a vehicle includes a transparent or translucid lid (15) for inspecting the level of oil in a chamber (13) housing the wheel-mounting bearings. A disk partition (23) is bolted to the inside of the lid to form a shallow subchamber (25). The disk is provided with orifices for oil level in the subchamber to follow the oil level in the main chamber. The visible surface (29) of the disk is painted white and the subchamber houses one or more loose elements (31) to wipe the inside of the lid clean.

Abstract: An inner combustion chamber access door member for a fuel-fired water heater has main and pilot burner structures respectively supported thereon by gas supply tubes sealingly extending through and anchored to the door member, and is further provided with a wire pass-through tube and a sight glass opening. After the door member has been externally secured to a side wall portion of the water heater over an access opening therein, with the main and pilot burner structures disposed in the combustion chamber of the water heater, a lighting wand is extended through the sight glass opening to light and test the burners. Subsequently, a sight glass structure is snapped into the sight glass opening to complete the installation of the door/burner assembly. Thermocouple and igniter wires extend through the pass-through tube, and are sealed therein by a laterally split resilient cylindrical sealing plug member.

Abstract: A weight vessel adapted for constructing a database for correcting outputs of load measurement sensing devices, in which the weight of the weight vessel can be changed in a desired arbitrary pitch without requiring any superfluous labor, any equipment such as a balance weight, and any dangerous work. The weight vessel includes: a vessel body shaped like a hollow box so that a liquid can be reserved in the inside of the vessel body. An injection inlet is formed in an upper portion of the vessel body and a discharge outlet is formed in a lower portion of the vessel body. A scale is formed on a side portion of the vessel body for indicating a value corresponding to the amount of the liquid reserved in the vessel body. At least the side portion provided with the scale thereon in the sides of the vessel body is formed of a transparent or semitransparent member so that the amount of the liquid in the vessel body can be seen through the transparent or semitransparent member.

Abstract: A fluid level indicating device comprises a transparent tube having a venturi section. A light-weight bead is disposed immediately above the venturi section. The transparent tube has a lower end which extends into a container, which container is to be filled with a liquid. The tube's lower end is positioned at the full level of the container. Air rising through the tube and accelerated in the venturi section will cause the bead to move and indicate when fluid is at the level of the end of the tube in the container. In a preferred embodiment of the invention, the tube is coupled to a specially designed funnel.

Abstract: A plug is provided for sealing a port of a downhole tool or other device. In one aspect, the plug includes a disk that has an upper surface, a lower surface and an annular groove in the lower surface. The annular groove has an inner wall and a outer wall. An annular seal member is positioned in the annular groove. An annular member is positioned in the annular groove between the annular seal member and the and the outer wall to retain the annular seal member in the annular groove. A member is provided that has least one external thread for engaging the at least one internal thread of the port whereby rotation of the member in a given direction moves the disk toward and compresses the annular seal member against the bottom surface. The plug provides excellent fluid sealing capability with a short axial dimension suitable for small O.D. and thin-walled tools.

Abstract: A container for liquids having a receptacle suitable for containing a liquid, the receptacle having a wall portion and a floor portion joined to contain liquid, the wall portion having an aperture suitable for allowing a substantial portion of the liquid to be viewed therethrough; and a window means for allowing a user to view the liquid contained in the receptacle, the window means being located contiguous with the aperture so as to prevent liquid from escaping from the receptacle through the aperture.

Abstract: A fluid-level indicating device comprises a tube having an upper section provided with a visible, movable structure which indicates when a container is filled with liquid. In a first embodiment, the indicator is a solid bead positioned above a venturi section formed in the tube. In a second embodiment, the indicator takes the form of an indicator fluid forming a plug or seal disposed in a continuous loop section formed in the tube.

Abstract: The present invention provides an apparatus for indicating the level of contents within a drum. Specifically, a user can estimate the content level of a drum from a distance. The present invention is particularly useful for hunters who can determine the level of feed remaining in an automatic deer feeder from a distance. The level is discernable by virtue of a brightly colored level indicator rod, and the contents of the drum are protected from having moisture and other debris enter into the drum through the present inventions access hole by virtue of a clear or transparent cover tube.

Abstract: A fitting for hydraulic flow measurement includes a fitting housing containing a principal flow duct, a throttle point arranged in the principal duct, a bypass duct for conducting a partial flow connected behind the throttle point to the principal duct, and a flow measuring device with a movable measuring and indicating member for the partial flow. The fitting housing includes a side pipe piece forming a side chamber, wherein the side chamber is directly connected to the principal duct in front of and behind the throttle point in the housing interior. The flow measuring device provided with a measuring part and an indicating part is held in the side pipe piece by single hole mounting and closes off the side chamber to the outside, wherein the indicating part is located outside of the side pipe piece and only the measuring part is acted upon by the partial flow.

Abstract: An improved fluid level verification apparatus which may be manufactured or otherwise fabricated as a kit and assembled at a remote location for use on liquid filled containers and configured to reduce inherent mechanical stresses on the inspection tube and resists leakage due to environmental, chemical, thermal or mechanical expansion cycles by using internal grooves and entrapped o-rings.

Abstract: A water based level measuring system including a water containing container with a base portion, a bottom and an upright defining chamber for containing water. The water containing chamber has a lower portion with an access opening communicating with the water and having an upper end portion. A measuring indica mechanism is operably linked to the water containing container. The measuring indica mechanism has a housing with a front element and a back element with the front element having a retaining recess for a moveable marked indicator element. The back element of the measuring indica mechanism is configured having a pair of retaining grooves for receiving and retaining a corresponding pair of retaining edges in the front element of the measuring indica mechanism. A tube connects the access opening of the fluid containing container and the measuring indica mechanism.

Abstract: The present invention relates to a measuring device for measuring flux rate and temperature of a flowable medium, comprising an external pipe sleeve and an internal pipe provided within said external pipe sleeve, with the diameter of said internal pipe having been dimensioned such that a cavity is formed between said internal pipe and said external pipe sleeve, wherein medium is allowed to flow into said internal pipe via an aperture formed at a first end of said internal pipe, and an aperture is provided at the second end of said internal pipe via which the medium can flow out of the internal pipe and exit the measuring device via said cavity. A flux meter and a temperature meter are provided within or along this flow path formed in the measuring device.

Abstract: The present invention is directed to an insulated beverage carafe adapted for use in an automatic drip coffee maker fabricated from non-reactive metal, having a heat resistant plastic handle that includes a detachable substantially transparent tubular gauge adapted to measure the amount of beverage within the carafe. Also taught is a method for preparing and serving hot coffee suitable in beverage service in individually dispensed portions, reading the gauge to determine when the carafe is empty; and, cleaning the empty carafe in a commercial dishwasher. An article of manufacture comprising packaging material containing an insulated beverage carafe with a handle that includes a gauge adapted to measure the amount of beverage within the carafe is also taught. The packaging material includes a brochure that provides directions for the use of said carafe.

Abstract: The present invention relates to a fuel bowl for a carburetor for an internal combustion engine. The fuel bowl includes a fuel bowl housing (18) having an inner fuel cavity (22) and opposed lateral sides (54), and a sight glass (58) provided in at least one of the opposed lateral sides of the fuel bowl housing positioned such that the nominal operating fuel level within the fuel bowl is approximately level with the center of the sight glass. The sight glass includes an outer frame (62) and a clear panel (64), wherein the level of fuel contained within the inner fuel cavity of the fuel bowl can be viewed through the view window of the sight glass.

Abstract: A sight gauge assembly for an urn sight gauge includes an elongated extruded sight gauge shield. The shield has a longitudinal axis and a generally U-shaped cross section defining the shield to have a sight gauge receiving recess extending along its entire length. The recess is defined by an arcuate inner surface terminated on opposite ends by first and second edges, respectively, so that an open sight gauge viewing region is provided between the edges. A tubular sight gauge is placed in the recess of the extruded sight gauge shield, and the arcuate inner surface of the recess conforms to a portion of a curved outer surface of the tubular sight gauge. An end cap is fixedly secured to a first end of the sight gauge shield and the assembly includes means for operatively connecting it to an associated faucet.

Abstract: A safety liquid level sight gauge with a transparent sight tube coaxially disposed between mounting blocks and concentrically within a transparent shield tube which is protected by a metal sleeve with a sliding inspection window for observing the liquid level therein. The gauge includes a sight tube breakage shut off system, and a leak shut off system. The breakage shut off system includes the transparent sight tube coaxially aligned between a pair of check valves within each mounting block. A check valve push rod is concentrically disposed and supported within the bore of the sight tube and urges both check valves to an open position allowing liquid to enter the bore of the sight tube. When the push rod collapses, such as when the sight tube is either cracked or broken, the check valve move to a closed position.

Abstract: An air flow testing device for use with a clothes dryer to indicate an obstruction in the exhaust system. Three potential states of exhausted air are monitored by the testing device when the dryer's lint screen is removed from its opening. In the first state, when the exhaust system is unobstructed, an impeller of the device freely turns within a casing held against the lint screen opening as the dryer is operating. In the second state, when the exhaust system is blocked, the same impeller remains static and does not rotate. In the third state when the exhaust system is partially blocked, the impeller moves and may stop. If either a fully or partially blocked state is detected, a user can simply clear the system including the tubing and flapper to resolve this common dryer problem without calling in a repair person.

Abstract: An oil nozzle structure for pneumatic tools is provided and mainly characterized in that an oil nozzle is directly mounted into a receiving space provided at an outer end of a handle portion of a pneumatic tool, and that a clear inspection window and a through oil port are provided on a wall of the handle portion of the pneumatic tool corresponding to the receiving space, such that oil may be directly supplied into the receiving space via the oil port and penetrate into the oil nozzle before being sent into the pneumatic tool by supplied air to lubricate internal components of the tool, and that oil level in the receiving space may be conveniently observed via the clear inspection window to timely replenish the receiving space with oil.

Abstract: A sight glass filter and check valve apparatus for use in a fluid line. The apparatus includes a housing, first and second couplers connected to the housing, a sight glass assembly, a filter assembly, and a check valve assembly. The housing includes a pair of coordinated apertures. Each of the couplers includes a first end and a second end with the first ends threadedly received by the housing and the second ends connected to the fluid line. The sight glass assembly is disposed within the housing in alignment with the apertures. The filter assembly is disposed between the housing and the first coupler. The check valve assembly is disposed between the housing and the second coupler.

Abstract: A container of coolant used in a NIKON.TM. stepper is utilizing a transparent duct mounted on a side of the container of coolant to check a liquid level. The container of coolant can be conventional or other similar container of coolant.

Abstract: A low ink sensing system is combined with an ink cartridge detection system to enable a more efficient ink jet printer. An ink container which supplies ink to an associated printhead is modified by the incorporation of two light directing elements, in the preferred embodiment, a faceted prism and a roof mirror, into a transparent wall of the container housing. The cartridge, comprising the ink container and associated printhead, is mounted on a scan carriage. Periodically, the carriage is conveyed to a sensing station comprising a pair of light sources and a commonly used photosensor. A first light source is energized and a beam of light is directed to a location where the roof mirror, would be positioned if the cartridge is present. If the cartridge is absent, lack of a reflected return signal is sensed, indicating a cartridge has not been inserted. Print operation is halted until a cartridge is inserted.

Abstract: A by-pass level indicator includes a main tube in communication with a tank via a pair of by-pass tube members, a float containing a magnet and an indicator attachably mounted to the main tube and having a series of magnetic colored flags reacting with the magnet of the float for indicating level of the tank. Each of the by-pass tube members includes a T-joint having an upright tube receivably engaging with one end of the main tube and a transverse tube integrally extending from the upright tube communicating the main tube to the tank. The transverse tube has a male threaded end portion to partly receiving an O-ring. The by-pass tube member further has a combination of a union and a collar adapted to communicating the transverse tube with the tank. The collar is threadingly engaged with the male threaded end portion of the transverse tube and clamps a connecting tube of the union to the transverse tube simultaneously compressing a protruding portion of the O-ring, thereby achieving a fluid-tight seal.

Abstract: A sight window assembly and a method of making same, the assembly being comprised of a windowpane panel mounted directly and under radial compression within an annular window-opening of a vessel wall panel and having cooperative annular peripheral portions which are complementary in shape to the window-opening defining portions of the wall panel, said panels having cooperative, mechanical, annular, positive interlocking elements.

Abstract: A sealed observation element for viewing the flow of molten liquid during the operation of a sulfur recovery unit comprises at least one sight glass that is heated and which may be swept with a purge gas supplied through one or more bleed rings to prevent condensation or deposition of materials on the side of the sight glass exposed to the process stream.

Abstract: A trailer construction includes first and second spaced apart trailer side walls. A bottom wall is provided between the side walls and includes a forward sloping portion, a rear sloping portion and an intermediate portion therebetween. The forward and rear sloping portions of the bottom wall are curved in cross section, and the intermediate portion includes a continuous wall which is curved when viewed in a horizontal cross section and is also curved when viewed in a vertical cross section. A discharge opening is provided in the intermediate portion of the bottom wall.

Abstract: A sight glass for a fluid vessel that includes a housing with facility for mounting to a fluid vessel wall, and a transparent window mounted within the housing for viewing fluid within the vessel from outside of the vessel wall. A valve mounted within the housing has a normally open position for permitting passage of fluid from within the vessel to adjacent the window, and a closed position for blocking such fluid passage. The valve includes structure responsive to one or more predetermined conditions at the sight glass for moving the valve to the closed position so as to block passage of fluid to the window, and thereby provide a visual indication of occurrence of the predetermined conditions from outside of the vessel.

Abstract: The invention is directed to lubrication of pumps, wherein due to relative space limitations, pumps oriented at various positions are provided sufficient oiling fluid to accommodate lubrication of cylinder surfaces preventing excess wear, such that an expansion tube projecting from and in secured operative communication with the crankcase of the existing pump is such that the tube having a graduated exterior surface is provided. The graduations are oriented in a parallel relationship relative to the axis of the tube and permit ease of viewing of sufficient pump oil volume when such volume is visible via the graduations. The tube provides for a removable cap structure to permit the adding or removal of fluid relative to the pump crank case.

Abstract: The present invention is directed to an animal feeder sight glass device. The device is a single multi-layered component made of a foam gasket with a central opening which seats on a vessel having an outer wall with an opening in the wall, a transparent lens and an outer lens holder plate also with an opening aligned with the opening in the vessel. The multi-layered component is secured to the vessel with screws which pass through openings in the gasket and outer lens holder plate.

Abstract: A hydraulic system for a work machine includes a fluid supply tank, a visual sight gage assembly, and an air expansion tank. A plurality of tubes and lines connect the supply tank to the sight gage assembly and the air expansion tank to the sight gage assembly. An enclosure wall partially encloses the supply tank and is positioned at an angle greater than 90.degree. with a horizontal plane. The sight gage assembly is connected to the wall enclosure and is positioned at the same angle. The construction of the sight gage assembly prevents trapping of air in the assembly when the supply tank is filled with fluid. Thus false readings of the fluid level in the supply tank is avoided.

Abstract: A fluid level detector for determining the level of fluids in motor vehicle components such as engines and transmissions includes a cylinder mounted in parallel to the surface of the fluid. The cylinder has a diameter which spans the fluid range to be monitored and includes a first, open end and a second closed end. A piston is disposed within the cylinder and is biased towards the first end where fluid is admitted to the cylinder interior and can be moved towards the second end under the influence of an actuator. When moved, the openings in the cylinder are blocked by the piston to thereby trap the fluid in the cylinder. As the piston continues to move towards the closed end of the cylinder, air above the fluid surface is exhausted through an orifice. Once the air is exhausted from the cylinder, fluid exits the orifice resulting in an increase in operator effort required to move the piston.