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7638042 |
System for monitoring the performance of fluid treatment cartridges
A fluid treatment system is provided, the system including a fluid treatment cartridge for treating fluid passing therethrough. The cartridge has an inlet through which untreated fluid enters the...
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7640077 |
Detection of clogged filter in an HVAC system
Static pressures are measured in an HVAC system and utilized to predict the condition of a filter in the HVAC system. As the filter becomes clogged, the static pressure can be expected to increase....
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RE39871 |
Particulate detection and air advice provision
A novel basic allergen/particulate data collection device and a novel multi-function personal air quality management device are disclosed. Both devices include sensor sub-assembly detecting and...
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7261762 |
Technique for detecting and predicting air filter condition
A method and system for detecting and predicting air filter condition for an air handling system operates by determining a system resistance to air flow. The system resistance is utilized to...
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7182855 |
Fuel filter with valve indicator
A fuel filter includes a first filter chamber, a second filter chamber and a valve assembly disposed between the first and second filter chambers. The valve assembly includes a valve casing with a...
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7098779 |
Method of providing notification of an air intake restriction
Notification of an air intake restriction is provided for an internal combustion engine ( 101 ). Readings from one or more air pressure sensors ( 117, 119 ) utilized with an internal combustion...
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7091868 |
Portable liquid level detector
A portable liquid level detector. The detector comprises a portable casing, a power supply unit disposed in the portable casing, a sensing device coupled to the power supply unit to sense a...
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7084778 |
Ammonia flow alarm and method therefor
A sensor system for monitoring cryogenic gas flow through a tube/pipe has at least one sensor coupled to the tube/piping. An alarm circuit is coupled to the sensor for receiving measurement signals...
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7075425 |
Apparatus and method for monitoring sewer system operation
Disclosed are methods and apparatus for monitoring a plurality of grinder pumps, and in particular, remotely over a communications network. Aspects of the invention include an alarm panel having a...
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7030766 |
Ambient condition detector with multi-function test
A device with a multi-function test feature for assessing or directing multiple sensor functions is provided for monitoring and interrogating air flow through Heating/Ventilation/Air-conditioning...
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7015820 |
Apparatus for monitoring a smoke detector
The proper function of a smoke detector of an enclosed space, such as a toilet or freight space or crew quarters in an aircraft, is monitored by at least two air pressure sensors which are so...
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6993414 |
Detection of clogged filter in an HVAC system
Static pressures are measured in an HVAC system and utilized to predict the condition of a filter in the HVAC system. As the filter becomes clogged, the static pressure can be expected to increase....
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6950029 |
Airflow blockage detection apparatus for a permanent split-capacitor single-phase fan motor
An airflow blockage detection apparatus for a permanent split-capacitor single-phase cooling fan motor measures and compares electrical currents in main and auxiliary windings of the motor to...
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6894620 |
Method and device for monitoring the service life of a filter
A method of monitoring the service life of a filter ( 1 ) in a filter system equipped with a fan, in particular a filter ( 1 ) in an air conditioning system of a motor vehicle, the instantaneous...
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6888466 |
Air filter timer
A novel air filter and timer for alerting persons responsible for changing or cleaning the air filter that it is time for servicing. An audible alarm is provided on the timer to emit a prolonged or...
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6842117 |
System and method for monitoring and indicating a condition of a filter element in a fluid delivery system
A filter condition sensing circuit includes current and voltage sensors and a data processor. The current and voltage sensors produce signals indicating magnitudes of electrical current and...
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6819232 |
Method of changing an air filter of vehicle air conditioning system
A method of signaling for a change of an air filter of a vehicle air conditioning system is disclosed. The present invention uses a sensor installed in a conventional air conditioner and the...
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6756904 |
Device for purifying exhaust gas of engines
The permeability of a DPF 21 mounted on a diesel engine 1 is evaluated by calculating the apparent passage area (A) based upon a difference in the pressure between the upstream and the...
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6734801 |
Switch frame electronic air filter alarming device
An alarming apparatus and methods for use with an air filter are disclosed herein. A filament can be stretched across a portion or section of an air filter frame, wherein the portion or section...
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6582295 |
Method of detecting clogging of an air filter and ventilation system employing such a method
A method of measuring clogging of an air filter in a system for ventilation, air conditioning and/or heating of a passenger compartment of a motor vehicle, includes starting up an electric motor (...
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6545609 |
Humidification system for fuel cell
A humidification system for a fuel cell includes a humidifier having a bundled plurality of tube type hollow thread members made of a water permeable membrane. The humidifier transfers a water...
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6507282 |
Filter monitoring system using a thermistor
A system for monitoring a percentage of filter life remaining of a filter assembly of filter-fan devices. The system uses a single thermistor that is operated in two separate modes for monitoring...
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6504474 |
Method and apparatus for detecting a restricted or bypassed transmission oil filter
A method and apparatus for detecting a restricted or bypassed transmission oil filter by providing pressure transducers on both sides of the oil filter whereby the pressure differential will...
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6448896 |
Air filter monitor for HVAC units
An electronic system for monitoring the condition of the filter in an HVAC unit includes a controller which issues at least one command to a circuit for the motor of the fan producing airflow...
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6377171 |
On-line filter monitoring system
A monitoring system ( 10 ) is disclosed for monitoring the condition of a filter ( 16 ) filtering a gas or liquid. Using various sensors, the permeability of the filter is monitored on a continuous...
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6338279 |
Flow detector to monitor a number of flow events or duration
A flow detector to detect and monitor the flow of fluid through a conduit comprising a first flow detection element selectively moveable between a first position and a second position and a second...
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6327902 |
Air filter restriction indicator gauge
A low cost air filter restriction indicator gauge for use in conjunction with an internal combustion engine can be achieved by both simplifying individual part configuration and reducing overall...
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6320513 |
Dirty filter indicator
A dirty filter indicator device adapted for use with a furnace, an air conditioning assembly and the like. As the filter collects dirt and dust, the overall airflow is restricted causing more air...
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6306290 |
Water filter replacement indicator
A water filter replacement indicator for apparatus that utilizes a filter for purifying water which has a power supply (20) and an auxiliary power supply (22). A timer (24) receives electrical...
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6307466 |
Two stage gauge with electrical signal output
A two stage air filter restriction indicating device communicates with the supply of air passing from an air filter to the air intake of an engine. The amount of vacuum required by the engine to...
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6268791 |
Switch gauge
An air filter restriction indicating device communicating with the supply of air passing from an air filter to the air intake of an internal combustion engine. The indicating device senses a...
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6161417 |
Restriction indicator for air cleaners
A restriction indicator for an air cleaner of an internal combustion engine. A bellows-type diaphragm is biased toward a retracted position by a first end of a compression spring. A calibration...
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6107923 |
Method and device for detecting the state of an air filter in a heating and/or air-conditioning installation of an automobile
The invention provides a method and device for detecting the state of an air filter in a ventilation system of the passenger compartment of an automobile vehicle. The installation is put into...
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6052058 |
Filter integrity monitoring system
A method and system for monitoring integrity of a filter (25) of a smoke or fire detector system. The system has a detector chamber (14) into which light is passed from a light source incorporated...
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6040777 |
Device and process for indicating the exhaustion of a filter
A device and a process for indicating the exhaustion of an adsorption filter to indicate a necessary filter change in time is provided. The monitoring device has a gas concentration-measuring...
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5955955 |
Drive-bay mounted cooling device
A cooling device is disclosed for a computer having a drive bay region with at least one drive bay adapted to receive a drive. The device comprises a case configured to mount within the drive bay...
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5887442 |
Refrigeration condenser filter system
A refrigeration system for an ice-making machine is provided with an inlet filter system having a replaceable filter element to trap dirt, dust and other airborne contaminants which would otherwise...
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5850183 |
Air filter restriction indicating device
An air restriction indicating device for measuring very low ranges of filter restriction (e.g., on the order of 0.0 to 1.5 inches of H 2 O or 0.0 to 0.54 psi) in a micronfilter used in vehicular...
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5774056 |
Gauge for monitoring air filters
An indicating device includes a housing that is separated into two sub-chambers by a flexible diaphragm. A indicating member is carried by the diaphragm so that the diaphragm and the indicating...
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5759492 |
End of life monitor for a gas filter
An end of life monitor apparatus for a filter that removes an undesirable gas including: (a) an elastic material, which degrades in the presence of the undesirable gas; (b) a support member coupled...
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5714939 |
Method of detecting the clogging of a filter installed in a washing machine
Disclosed is a method of detecting the clogging of a filter installed in a washing machine by which a user can recognize the clogging of the filter. The method comprises the steps of detecting a...
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5693926 |
Differential pressure indicators
A double differential pressure indicator has a housing containing two pistons arranged in contiguous bores and biased by a single spring extending between opposed ends of the pistons. The...
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5681988 |
Apparatus for indicating the degree of dirtiness of a filter
An apparatus for indicating the extent to which an air filter in an internal combustion engine is fouled. For this purpose the apparatus includes a pressure sensor, a sensor to detect the...
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5668535 |
Filter condition sensor and indicator
A filter condition sensor and indicator is disclosed. A filter condition sensor and indicator that responds to the presence of a predetermined collection of material in a filter operatively...
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5610592 |
Fire detecting apparatus
A first dust recovering part is disposed upstream in an air inlet passage from a fire detecting part. The air flow is deflected in the first dust recovering part so as to cause the dust to drop to...
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5606311 |
Air filter diagnostic
Significant restriction in an automotive internal combustion engine intake air filter is diagnosed over a wide range of engine operating conditions including low intake airflow rate conditions by...
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5604306 |
Apparatus and method for detecting a plugged air filter on an engine
An apparatus and method for detecting a plugged condition of an air filter uses a computer based model of the air restriction.
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5602373 |
Differential pressure switch with an adjusting piston driven by a restoring spring for an oil-separating air filter
A differential pressure switch particularly suitable for monitoring dirt accumulation on a filter element of an oil-separating air filter comprising a piston which is movable in response to a...
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5595138 |
Apparatus for detecting operational anomalies in pressurized fluid circuits
The present invention relates to an apparatus for detecting operational anomalies in a pressurized fluid circuit having a main pump, a fluid filter and a booster pump connected in series. The...
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5563585 |
Water pump monitor
A transparent housing for installation in a marine raw water line. The housing has an inlet chamber including a perforated plate disposed athwart the housing and comprising the downstream wall of...
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