Abstract: Enhancements to an air handler of an air conditioning system. The enhancements can include a scent dispersion system, a heat exchanger rinse system, and/or an air handler condensation drain pipe flush system. The scent dispersion system employs a pressure differential established within the air handler to draw a scent mist from a scent reservoir. The scent is disbursed throughout the structure by the air conditioning ventilation system. The heat exchanger rinse system dispenses a rinse fluid onto the heat exchanger. A cleaning composition can be injected into the rinse fluid to aid in the cleaning process. The flush system automatically configures a check valve upstream of the flush injection point. A flush fluid flows through the drain pipe applying a pressure to dislodge a blockage therein. A chemical composition can be added into the flush fluid to assist in the dislodging process.

Abstract: A substrate processing apparatus configured to perform a preset processing on a substrate includes a pipe through which a liquid flows; a liquid leakage collector configured to receive the liquid leaking from the pipe; a first detector provided within the liquid leakage collector, and configured to detect the liquid; a second detector provided at a position higher than the first detector within the liquid leakage collector, and configured to detect the liquid; an indicator configured to notify liquid leakage information indicating a liquid leakage; a power supply configured to perform a power feed to the substrate processing apparatus; and a controller configured to control the indicator to notify the liquid leakage information based on a detection result of the first detector, and control the power supply to stop the power feed to the substrate processing apparatus based on a detection result of the second detector.

Abstract: A water safety garment and apparatus configured to avoid drowning can be configured to permit submergence for a predetermined period of time without inflation. After the predetermined time has passed, the garment or other apparatus can be configured to inflate to help a person wearing the garment float on top of the water to avoid drowning or other potentially harmful condition that may result from being underwater for too long. In some embodiments, a circuit may be utilized to detect the submergence condition of a person wearing the apparatus or garment. Upon a determination that the detected submergence condition has occurred continuously for a pre-determined period of time, an inflation mechanism can be actuated to force the person wearing the apparatus or garment to float to the top of the water.

Abstract: A structure for detecting a leak, wherein the structure is supported upon a supporting surface, the structure including a leak detector; and a bottom-facing surface comprising an inverted depression in which the leak detector is disposed, the inverted depression is configured to be suitable for inducing capillary actions in a liquid collected on the supporting surface, wherein when the inverted depression comes in contact with the liquid at its periphery, the liquid is drawn to the leak detector to be detected.

Abstract: A fluid sensing system and approach having a leak sensor. The leak sensor may output a signal when a fluid is detected. The signal may go to an alarm circuit which can sound a warning or alert. The signal may also go to a control interface of a piece of equipment, such as a water heater, to shut off the piece equipment in an event that it is causing a leak of fluid. Also, the sensing system may have a low battery sensor and indicator in case a battery supplying power for the sensing system is running low. The sensing system may be made of analog circuitry and discrete components.

Abstract: A residential and commercial hot water and steam boiler safety system and device that includes at least one hollow pipe, with one plugged or sealed end and a fitting on the other end for connecting the pipe in a substantially vertical mounting position, and at least one two float switch disposed in the pipe and electrically connected in series with a limit switch in the boiler, where the pipe is adopted for the flow and accumulation of water, so that float switch activates as the pipe fills with water and shuts off the boiler by turning off the gas valve, promoting safer boiler and steam boiler operation. Additional float switches positioned above or below in the hollow pipe may provide additional functions, such as a warning light and sound to the owner, or a notification via a telephone or cell phone system or through the home network or Wi-Fi system.

Abstract: A magnetometer includes a measurement value transducer that supplies a signal to a first amplifier device; a summation element that reduces an output signal range of an output signal of the first amplifier device; a second amplifier device that amplifies an output signal of the summation element; a low-pass filter filtering an output signal of the second amplifier device; an analog-digital converter converting output of the filter into digital form; and a correction element that divides the digital signal by a correction factor that corresponds to the defined gain factor of the second amplifier device and adds a digital correction signal to the quotient to form a resulting signal, where a scope of the correction signal corresponds to the defined attenuation of the output signal of the first amplifier device.

Abstract: A sensor for detecting changes in fringe capacitance responsive to at least one of a target animal and a target pest by mutual capacitance sensing may include a plurality of conductors including an electrically conductive sensor conductor, which is a transmit electrode, and two electrically conductive un-grounded conductors, which are each a receive electrode, disposed on opposing sides of the sensor conductor defining a triplet. The plurality of conductors may be supported on an un-grounded conductive substrate which is electrically isolated, via an electrical insulator, from the plurality of conductors. Each conductor of the plurality of conductors may have a width and a thickness, and may be disposed spaced apart from the other conductors of the plurality of conductors and the un-grounded conductive substrate by a distance such that a directional fringe field responsive to the at least one of the target animal and the target pest is generatable.

Abstract: A multi-directional water sensor comprises a housing having multiple conductive pads on the outer surface of the housing at locations spaced around the periphery of the housing, an electrical power source located inside the housing, a buzzer located inside the housing, and multiple electrical conductors located inside the housing and connecting multiple pairs of the contacts so that electrical current can flow between different pairs of the contacts when they are connected by water. The buzzer produces a sound when electrical current flows between any pair of the contacts.

Abstract: A device with controllable switch terminal voltage, comprising: a switch signal unit for outputting a corresponding switch signal according to the state of a switch, wherein the switch is coupled between the switch signal unit and an output of a power supply; a biasing unit coupled to the switch signal unit for outputting a bias voltage to the switch signal unit; wherein when the switch is open and a conductive liquid and/or the stream of conductive liquid exists inside the switch, the biasing unit cooperates with the switch signal unit so as to control the terminal voltage of the switch and the current flowing through the switch. The disclosed switch design allows the switch terminal voltage to be less than 1V when the switch is opened, which greatly depresses the electrochemical reaction of the switch, thus prolonging the switch life, and avoiding the possibility of hydrogen explosion.

Abstract: An exemplary monitoring assembly includes a sensor that provides a first output when a lubricant reservoir holds a first amount of a contaminant, and a different, second output when the lubricant reservoir holds a different, second amount of the contaminant. A lubrication system monitoring controller operatively coupled to the sensor and configured to initiate a maintenance mode in response to the second output.

Abstract: A moisture management apparatus monitors an area for moisture events and wirelessly transmits moisture-related information to one or more notification devices. An embodiment of the moisture management apparatus includes a substrate and one or more sensors supported by the substrate. The sensor(s) emit wireless signals indicative of the moisture-related information. A sensor event communication system forwards the sensor signals to another device, such as a notification device. The sensor event communication system may monitor other types of patient events. Portions of the moisture management apparatus and/or the moisture event communication system may be embodied in a patient support apparatus, such as a bed.

Abstract: The present disclosure relates to a water detection device that includes a water-activated battery configured to supply an electrical voltage upon contact with water, an electronic circuit configured to receive the electrical voltage from the water-activated battery, where the electronic circuit is configured to communicate with an external, electronic device upon receipt of the electrical voltage, and a housing configured to receive the water-activated battery and the electronic circuit, where the housing has passageways configured to facilitate movement of water into the housing and toward the battery.

Abstract: An apparatus comprising: a humidity-dependent electrical energy source configured to provide electrical energy when an environment occupied by the humidity-dependent electrical energy source becomes humid; and an electrically activated visual indicator coupled to receive provided electrical energy from the humidity-dependent electrical energy source and configured to provide a visual indication that the environment occupied by the humidity-dependent electrical energy source has become humid.

Abstract: A leak detection system for flat commercial roof structures is disclosed in order to detect and subsequently repair a leak as soon as possible such that any damage to the roof, as well as to other structural and/or insulation components of the overall roof structure, can be minimized due to the absorption or migration of the water. The leak detection system may comprise elongated water detection sensor strips to be fixedly secured to at least two edge portions of insulation board assemblies, or alternatively, electrical circuits may be provided over the entire expanse of the major upper surface portion of each insulation board assembly, or alternatively still further, rolls of water detection sensor strips may be applied to different regions of the flat commercial roof structure.

Abstract: A dryness sensor uses a block of superabsorbent polymer that absorbs liquid and increases in size as liquid is absorbed. When the block of superabsorbent polymer increases in size in the presence of liquid, the block of superabsorbent polymer contacts one or more electronic components coupled to a moisture detection circuit that provides an indication of moisture. When the block of superabsorbent polymer loses moisture, it decreases in size until the block of superabsorbent polymer no longer contacts the one or more electronic components. The moisture detection circuit detects when the block of superabsorbent polymer no longer contacts the one or more electronic components, and provides an alert indicating a lack of moisture. The dryness sensor could be used, for example, to monitor the moisture content of soil in a pot that has a house plant growing in the pot.

Abstract: A child safety boundary alarm system, for warning caregivers of a dangerous situation when a child passes a boundary near a hazard such as a swimming pool. The system includes a base unit, an auxiliary unit, and a bracelet worn by the child. The caregivers have portable electronic devices. The base unit and auxiliary unit have annunciators and the system is connected to a computer network. When the base unit determines that the child has crossed the boundary, audible and visual warnings are generated by the annunciators and notifications are provided to the electronic devices of the caregivers using the computer network.

Abstract: The invention relates to an on-load tap changer (2) according to the reactor switching principle for uninterrupted load switching between different tap windings of a tapped transformer (1), comprising: —an inductor (3) which is designed as an inductive transition reactance; —the inductor (3) being part of the on-load tap changer (2).

Abstract: An inspection apparatus of an electrolyte membrane is provided. The apparatus includes a lower supporter having a gas line through which gas flows or a concave portion that stores the gas. An upper supporter is disposed at an upper side of the lower supporter, and includes an opening. A membrane-electrode assembly is disposed between the lower supporter and the upper supporter. An upper cover covers an upper portion of the opening, and is formed with a plurality of partitions. An exhaust port is formed at the upper supporter to exhaust deionized water.

Abstract: A magnetic tracking tag for animals may detect the occurrence of a predation event. The tag may include a pH sensitive material that degrades in the environment of a predator's gut. The degradation of the pH sensitive material causes a change in a detectable magnetic field of the tag, which allows the tag to detect the predation event and adjust its operation accordingly.

Abstract: An automatic air conditioner condensate drain line clean-out system (1) having a flushing line (6) which is preferably supplied by a home's hot water heater and connected to a condensate drain line (3). A supply valve (10) that supplies the hot water preferably controlled by a timer (11) that allows the system to be activated on a reoccurring basis. A drain valve (13) is located on the condensate drain line subsequent to a point of connection between the flushing line and the condensate drain line to prevent backflow of water from the flushing line into a drain pan (2) of the air conditioning system.

Abstract: A rain sensor can be configured to shut off one or more irrigation devices during and/or after a period of rainfall. The rain sensor can include a moisture basin mounted therein. The moisture basin houses an absorbent element configured to expand in at least one direction when wetted. Expansion of the absorbent element can activate a signal actuator to generate a shut off signal to one or more irrigation devices. The moisture basin can retain excess moisture when the absorbent element is fully saturated.

Abstract: Provided herein are devices, systems and methods for the in situ monitoring of a fire burning area. The device comprises a flotation unit having a body housing, an electronic unit with a radiofrequency antenna exteriorly disposed thereon configured to monitor, record and transmit/receive data obtained from within a burning fire, such as an oil fire, wirelessly to a primary collecting unit and, optionally, an ignition unit to ignite the fire. The system comprises the flotation units, means for connecting the units for deployment on the water and the hardware/software necessary to run the system and analyze and calculate temperature, position and surface area of the burn. The flotation devices communicate wirelessly to each other and to a primary collecting unit which provides the communicated data to a processing unit.

Abstract: A detecting element is provided for detecting leaks of an electrically nonconductive liquid, in particular of hydrocarbons, as well as a detection cable and a detection system using such a detecting element. The detecting element includes a detection member made of a material which inflates upon contact with the liquid and which is loaded with electrically conductive particles, to be conductive when not contaminated by the liquid, and to lose the conductivity when inflating from contact with the liquid. The detection member is electrically connected to an electronic management module, which is arranged for detecting the presence of the liquid by noticing a decrease in the conductivity of the detection member. In a preferred embodiment, the detection cable includes four insulated conductive wires, one of which is embedded in the detection member which is itself protected by an inflatable casing, which is also insulating and water-proof.

Abstract: Methods and apparatus are provided herein for sensing rain fall for use in irrigation control. In one embodiment, a wireless rain sensor comprises a housing at least partially covering a first sensor, a controller and a wireless transmitter. The first sensor comprises a moisture absorptive material located to be contacted by rain fall and configured to expand in response to the contact with the rain fall and contract in response to an absence of the rain fall. The controller is coupled to the first sensor and configured to output signals corresponding to a variable amount of expansion and contraction of the moisture absorptive material. The wireless transmitter is configured to transmit wireless signals, at least one wireless signal comprising data corresponding to the variable amount of expansion and contraction of the moisture absorptive material.

Abstract: A moisture concentration detecting device including a gas chamber; a pair of porous electrodes facing each other in the gas chamber; a solid electrolyte membrane sandwiched between the electrodes; a case which covers the electrodes and the solid electrolyte membrane and on a surface of which a pleated portion is provided; an impedance measuring circuit measuring an AC impedance between the electrodes by applying an AC voltage to the electrodes; a storage device storing therein conversion information for converting an AC impedance between the electrodes into a moisture concentration in the insulating gas; and a computing unit obtaining a moisture concentration in the insulating gas from a measured value of the AC impedance by referring to the conversion information stored in the storage device with respect to the measured value of the AC impedance input from the impedance measuring circuit.

Abstract: A condensate overflow detection device includes a frame, a housing, an affixing device, a surface placement mechanism, a float and an actuator. The housing has a bottom and a plurality of pan engagement side surfaces extending upwardly from the bottom, each of which is disposed at a different angle relative to the bottom surface. The housing defines a vent structure passing therethrough that allows water to pass into the housing. The affixing device clamps a pan engagement side surface to a sidewall of a secondary condensate pan. The surface placement mechanism places one of the pan engagement side surfaces opposite from the affixing device. The float, disposed within the housing, has a first position when no water has entered the housing and a second position when a predetermined level of water has entered the housing. The actuator causes an event when the float is in the second position.

Abstract: The invention relates to an electrical isolating device (2) comprising a first connecting part (4a), a second connecting part (4b), an isolation point (6) which in the closed state forms a current path between the first and the second connecting parts (4a, 4b) and is located spatially between the connecting parts, wherein in the isolated state the isolation point (6) isolates the current path between the connecting parts (4a, 4b), and further comprising an auxiliary drive (8) which influences isolation of the isolation point (6). Particularly reliable isolation is ensured in that a flowable medium (10) driven by the auxiliary drive is disposed in such a way that it surrounds the isolation point (6) at least partially at least at the moment of isolation.

Abstract: Absorbent articles incorporating sensory element members are disclosed. The absorbent articles may be disposable pant like garments designed to assist urinary toilet training such as of young children. Upon urination by the wearer, the article produces a feedback response which is transmitted to the wearer by the sensory element member. Wetness based, temperature based and other feedback responses are disclosed. The feedback response should be immediate and unmistakable to the wearer and also be temporary and harmless.

Abstract: A leak detector assembly uses fluid collected from a leaking conduit to automatically prohibit flow. The assembly includes a housing having a bottom, a top and a perimeter wall extending between the bottom and the top. A basin is coupled to the top of the housing. A drain opening is positioned in the basin. A collection pan is positioned below the drain opening to collect fluids passed through the drain opening from the basin. An electrical circuit is coupled to the collection pan. A sponge is coupled to the collection pan positioned over and contacting spaced contacts whereby the sponge completes the electrical circuit when the sponge becomes wet. A stop valve is coupled to a fluid conduit providing fluid to a position over the basin. The stop valve is operationally coupled to the electrical circuit whereby the stop valve closes upon the electrical circuit being completed.

Abstract: A disposable diaper with wireless alarm system includes a) a disposable diaper structure; b) a disposable diaper telltale conductive strip; c) an attachable, removable, reusable battery-powered sensor-transmitter device; and d) a wireless receiver with an alarm signal. Multiple diapers with different frequencies and optional disconnect sensors may be included and controlled by local or remote computer.

Abstract: A toothbrush can include a handle and a head. At least one bristle can be attached to the head. The toothbrush can also have an illumination member, an illumination circuit and an activation device. The activation device can include two contact members fixed in a non-contact position on an outside of the handle. A method can include causing conduction between the contact members to activate the illumination circuit. The toothbrush can be an electric toothbrush. The electric toothbrush can have an illumination member positioned such that light from the illumination member can be seen by a user in a mirror facing the user.

Abstract: An absorbent article includes a liner and an outercover in facing relation and at least one conductive element located between the liner and the outercover. At least a portion of the conductive element is exposed through the liner and/or the outercover to define at least one external contact point. The external contact point defines a perimeter and the liner and/or the outercover is sealed about the perimeter. The contact points provide external access to the internal conductive elements.

Abstract: A signaling device is provided for sensing and indicating the presence of a body exudate in an absorbent article, the device including a housing and a detection circuit disposed within the housing, the detection circuit including an induction coil and a marginal oscillator. A body exudate collection and detection system is also provided including an absorbent article and a signaling device adapted to be used in conjunction with the absorbent article, the signaling device including a housing and a detection circuit disposed within the housing, the detection circuit including an induction coil and a marginal oscillator. The signaling device can also include an attachment mechanism for removably attaching the housing to the absorbent article. The detection circuit can also include an electrical common and a conductor in electrical communication with the electrical common and with the body exudate.

Abstract: An excrement detection sensor in which two pairs of conductors 1, 2 and 3, 4 are formed between a carrier body 6 and a coating body 7 both having water-proof property and insulating property, wherein the cover body is formed with an urine introduction port 8 correlating the paired conductors and with a faeces introduction port 9 correlating the other paired conductors, and when urine enters into the urine introduction ports, the one pair of the conductors are short-circuited and when faeces enters into the faeces introduction ports, the other one pair of the conductors are short-circuited, whereby the urination and the evacuation can be distinctively detected.

Abstract: Embodiments of the invention are related to oxidative opening switches and related methods, amongst other things. In an embodiment, the invention includes a switch assembly including a first terminal, a second terminal, and an oxidative switch element in electrical communication with the first terminal and the second terminal, the switch element comprising a conductive material and an oxidizer, the switch element configured to interrupt electrical communication between the first terminal and the second terminal as a result of an oxidation reaction between the conductive material and the oxidizer. In an embodiment, the invention includes a fast opening switch for pulse power applications. Other aspects and embodiments are provided herein.

Abstract: Danger of electrocution and fire from high voltage systems in electric and hybrid electric vehicles is mitigated by isolating high voltage electric power sources, of vehicles involved in accidents, in a sealed enclosure. It involves the use of voltage disconnect devices to rapidly, manually or automatically disconnect and isolate the vehicle energy storage devices from the electrical system of the vehicle with ease and safety. The electrical power source may be a battery, a battery pack, a capacitor or other device which may be used to store electrical energy onboard a vehicle.

Abstract: An absorbent article includes a backsheet having a longitudinal axis, a topsheet attached to the backsheet and having a body-facing surface, and an absorbent core disposed between the backsheet and the topsheet. The article may also include barrier leg cuffs. The article further includes a sensation aspect, which sensation aspect may be provided between the core and the topsheet. The sensation aspect may be, for example, a temperature sensation aspect. A visible indicator may be associated with the sensation aspect.

Abstract: A method and apparatus for alerting a colostomate or medical attendant to the presence of fecal matter. The device includes a hollow plug detachably securable to a flexible port positioned about the stoma. The port carries an alarm circuit which is triggered when fecal matter enters the plug lumen which will alert the colostomate to an impending episode. The signal may be vibratory, audible or visible and may be transmitted to a remote location. The device includes an inflatable air cuff which, when inflated, presents a physical barrier to the passage of fecal matter. Gas may pass through filters in the tube. The method involves positioning the device in the stoma, inflating the cuff and generating an alarm when matter is sensed.

Abstract: The present invention provides an apparatus and method for removably attaching one or more electronic components to an article of clothing. Opposing magnets and attachment members for the magnets are placed on opposite sides of clothing.

Abstract: A method and apparatus for alerting a colostomate or medical attendant to the presence of fecal matter. The device includes a hollow plug detachably securable to a flexible port positioned about the stoma. The port carries an alarm circuit which is triggered when fecal matter enters the plug lumen which will alert the colostomate to an impending episode. The signal may be vibratory, audible or visible and may be transmitted to a remote location. The device includes an inflatable air cuff which, when inflated, presents a physical barrier to the passage of fecal matter. Gas may pass through filters in the tube. The method involves positioning the device in the stoma, inflating the cuff and generating an alarm when matter is sensed.

Abstract: A fluid leak detection system includes a reservoir, a predetermined quantity of a disinfecting liquid contained within such a reservoir, and at least a pair of elongated conduits. A mechanism for automatically opening the distal end of the at least one conduit includes a leaking fluid absorbent member disposed along the distal end of each of the conduits. The fluid-dissolvable member is dissolved by the leaking fluid and absorbed by the member to permit the conduit to be unfolded and allow the disinfecting liquid to flow outwardly from the distal end of the at least one conduit. The system further includes a support frame attached to a support surface, an interface, a communications device electrically coupled to a switch, a monitoring station, and a communications link connecting the communications device to the monitoring station.

Abstract: A sensor for detecting the presence of a liquid. The sensor includes a housing having a concave upper surface, a concave lower surface, and a peripheral wall connecting the upper surface and the lower surface, the wall extending above the upper surface and below the lower surface. A plurality of apertures are formed in the wall. A plurality of electrically conductive members extend above the upper surface and below the lower surface and are separated from one another by a gap in which a liquid can accumulate. The electrically conductive members are configured to generate an output signal when a conductive liquid comes into contact with the electrically conductive members and bridges the gap. An output connector is coupled to the plurality of electrically conductive members and is configured to carry the output signal.

Abstract: A wetness monitoring system is provided for an absorbent article, the wetness monitoring system including a signaling device including a counter to count the number of discrete insults, a timer to monitor the elapsed time that the article has been worn, and an alarm to indicate that the number of discrete insults has reached an insult limit or that the elapsed time has reached an elapsed time limit, whichever occurs first. The signaling device can be adapted to indicate one of first, second, and third conditions, the first condition being that the number of discrete insults has reached an insult limit, the second condition being that the elapsed time has reached an elapsed time limit, and the third condition being the first to occur of either of the first and second conditions, and wherein the condition to be indicated is selected by the wearer or by a caregiver.

Abstract: The present invention relates to a dehumidifier safety cut-off system. This invention is an after-market safety accessory for existing dehumidifiers which operate through the use of a condensate-pump. The safety cut-off system would automatically shut down a dehumidifier in the event of pump failure by disabling the power supply to the dehumidifier. This system would consist of a compact housing with an external power cord, a transformer, a normally closed relay, and a pair of external, low voltage leads that would be connected to the safety float switch leads of the condensate pump. The invention could also feature an alternative version that could be hard wired in place.

Abstract: An apparatus for monitoring environmental conditions favorable for mold, mildew and fungus growth includes a microprocessor having a data map, a temperature sensor attached to the microprocessor, a relative humidity sensor attached to the microprocessor, an indicator array attached to the microprocessor, and a power supply attached to the microprocessor. The indicator array may be a single warning light or an array with a plurality of warning lights. The indicator array may also be an audio speaker. The indicator array may also include a message display for digitally displaying one or more ambient condition.

Abstract: A battery operated moisture indicator for selective attachment to an existing diaper worn by a baby, having an audible alarm and having a liquid crystal display bulb, for providing an audible alert and a visual alert, respectively, when the diaper has been wet by the baby. The circuit includes a mechanism for selectively activating the alarm and the liquid crystal display bulb when an aqueous electrolyte-containing solution has wetted the diaper. The moisture indicator is provided with a diaphanous sac having a clip for selectively attaching the moisture indicator to the external surface of the front of an existing diaper, thereby providing a moisture indicator that is comfortable for a baby to wear.

Abstract: A pressure transmitter for transfer of a pressure prevailing in a first medium onto a second medium, including a pressure chamber 4 in a platform 1, which chamber is separated from the first medium by means of a dividing membrane 2, wherein the pressure can be transferred by means of the second medium to a pressure measurement cell. For timely recognition of an impending failure of the dividing membrane, an early warning detector is provided with a sensor chamber 6 having an opening, which faces the first medium; and a sensor 7, which monitors a property of a medium container in the sensor chamber; and a barrier facing the first medium, pressure-tightly sealing the opening, and which, under contact with the first medium and equal conditions as experienced by the dividing membrane 2, fails earlier than the dividing membrane, thus making possible a flow connection between the sensor chamber 6 and the first medium.

Abstract: A system and method for delaying the activation of a powered device, such as a battery powered device. The activation of the device is triggered by contact with a particular environmental characteristic encountered by the device. For example, the system can be configured to activate upon contact with a particular pH value. Upon contact with the particular environmental characteristic, the restraining component (such as a magnetic field or a separating member) that prevents activation of the device is moved, modified, or caused to yield such that the device is activated.

Abstract: A variable differential adjustor for a fluid pressure-actuated switch, with the fluid, in the preferred form of the invention, being air. The restrictor has a restrictor housing with a fluid passage in which a restrictor plug, typically a set screw, is engaged. By judicious adjustment of the position of the set screw, fluid flow to and from a pressure-actuated switch is controlled, controlling when the switch is activated to control apparatus such as a sump pump, and when the switch is deactivated.