Abstract: The embodiments herein discloses a linear seal system for interconnecting flow controller modules in a fluid flow controller. The system comprises a flow sensing module is coupled to an inlet connection module to measure a fluid flow rate to generate a sensor output signal. A flow control valve module is coupled to the flow sensing module to provide a user desired flow rate through an outlet connection module. An electronic control system is configured to regulate an operation of the flow sensing module and the flow control valve module based on the command signal to achieve a desired flow rate. A linear track system provided to support all the modules in a linear arrangement, includes a dovetail locking configuration. The linear track has two rod/screws to compress the seals between the modules.

Abstract: The embodiments herein discloses a linear seal system for interconnecting flow controller modules in a fluid flow controller. The system comprises a flow sensing module is coupled to an inlet connection module to measure a fluid flow rate to generate a sensor output signal. A flow control valve module is coupled to the flow sensing module to provide a user desired flow rate through an outlet connection module. An electronic control system is configured to regulate an operation of the flow sensing module and the flow control valve module based on the command signal to achieve a desired flow rate. A linear track system provided to support all the modules in a linear arrangement, includes a dovetail locking configuration. The linear track has two rod/screws to compress the seals between the modules.

Abstract: A turbine wheel flow measuring transducer located in a fluid receiving chamber is provided for measuring low flow rates of fluids, whether liquids, gases, or mixtures, and in controlling the fluid flow rates. The transducer is in the form of a small diameter turbine wheel having a plurality of semi-circular lateral openings in its outer periphery. The openings are sequentially presented to the incoming fluid into the chamber and the turbine wheel rotates according to the fluid flow rate. Measuring and controlling of fluid flow rates as low as 4-5 milliliters per minute and as high as 100 milliliters per minute is permitted.

Abstract: A flow system includes a proportional valve constructed of chemically inert materials (PTFE) to produce variable fluid flow rates of liquids including inert, and high purity, and even highly corrosive liquids. Gases of many varieties can also be flow controlled. The valve may be precisely set, either manually, or by use of an actuating motor, remotely or electronically, for various flow rates for the required fluid. The valve allows for specific proportional flow parameters to be programmed into valve structure and configuration to provide precise and repeatable highest resolution flow control for a wide variety of complex flow conditions (pressure, temperature and viscosity).

Abstract: The flow of a fluid at low flow rates is measured in a flow sensing assembly and controlled without introducing measuring devices into the fluid flow path. The flow sensing assembly is enclosed in a housing to lessen ambient and fluid temperature change effects on the measurements obtained. As the fluid is flowing through tubing in the flow sensing assembly, the tubing is heated to impart heat to the fluid. Heat sensors are attached at spaced positions from each other along the tubing in the direction of fluid flow to sense temperatures. The amount of heat applied to the tubing is controlled to maintain an established temperature differential between the heat sensors. The amount of heat applied is measured to provide an accurate and proportional indication of the fluid flow rate.

Abstract: A flow system includes a proportional valve constructed of chemically inert materials (PTFE) to produce variable fluid flow rates of liquids including inert, and high purity, and even highly corrosive liquids. Gases of many varieties can also be flow controlled. The valve may be precisely set, either manually, or by use of an actuating motor, remotely or electronically, for various flow rates for the required fluid. The valve allows for specific proportional flow parameters to be programmed into valve structure and configuration to provide precise and repeatable highest resolution flow control for a wide variety of complex flow conditions (pressure, temperature and viscosity).

Abstract: The flow of a fluid at low flow rates is measured in a flow sensing assembly and controlled without introducing measuring devices into the fluid flow path. The flow sensing assembly is enclosed in a housing to lessen ambient and fluid temperature change effects on the measurements obtained. As the fluid is flowing through tubing in the flow sensing assembly, the tubing is heated to impart heat to the fluid. Heat sensors are attached at spaced positions from each other along the tubing in the direction of fluid flow to sense temperatures. The amount of heat applied to the tubing is controlled to maintain an established temperature differential between the heat sensors. The amount of heat applied is measured to provide an accurate and proportional indication of the fluid flow rate.

Abstract: The flow of a fluid at low flow rates is measured and controlled without introducing measuring devices into the fluid flow path. As the fluid is flowing through tubing, the tubing is heated to impart heat to the fluid. Heat sensors are attached at spaced positions from each other along the tubing in the direction of fluid flow to sense temperatures. The amount of heat applied to the tubing is controlled to maintain an established temperature differential between the heat sensors. The amount of heat applied is measured to provide an accurate and proportional indication of the fluid flow rate.

Abstract: The flow of a fluid at low flow rates is measured and controlled without introducing measuring devices into the fluid flow path. As the fluid is flowing through tubing, the tubing is heated to impart heat to the fluid. Heat sensors are attached at spaced positions from each other along the tubing in the direction of fluid flow to sense temperatures. The amount of heat applied to the tubing is controlled to maintain an established temperature differential between the heat sensors. The amount of heat applied is measured to provide an accurate and proportional indication of the fluid flow rate.

Abstract: A sensing circuit of a thermal mass flow sensor provides enhanced precision control of heating and temperature sensing coils used for fast sensing responses. The sensing circuit includes a pair of coil servo loops achieving servo loop control of the sensing coils in each servo loop. The current paths in the servo loop include a main current path carrying low levels of current and minor current paths carrying very small levels of current. These small levels of current have insignificant current levels compared to the levels of current in the main current path. The single main current path in the servo loop allows nearly all of the current from the primary servo amplifier to be used for driving the coils, thereby improving the efficiency of the coil servo loop. The heating and sensing coil in each servo loop is coupled to an integration network for measuring power provided to the coil.

Abstract: A sensing circuit of a thermal mass flow sensor provides enhanced precision control of heating and temperature sensing coils used for fast sensing responses. The sensing circuit includes a pair of coil servo loops achieving servo loop control of the sensing coils in each servo loop. The current paths in the servo loop include a main current path carrying low levels of current and minor current paths carrying very small levels of current. These small levels of current have insignificant current levels compared to the levels of current in the main current path. The single main current path in the servo loop allows nearly all of the current from the primary servo amplifier to be used for driving the coils, thereby improving the efficiency of the coil servo loop. The heating and sensing coil in each servo loop is coupled to an integration network for measuring power provided to the coil.

Abstract: A turbine wheel flow measuring transducer is provided for measuring low flow rates of corrosive fluids, whether fluids or gases. The transducer has a turbine wheel rotating in a housing fluid chamber at a rate set by the corrosive fluid flowing through the housing. Infrared light passing through the fluid is sensed and converted by an optical flow measurement circuit. The amount of light which passes through a rotating turbine wheel indicates flow rate. A processing circuit forms output signals indicative of fluid flow rate.

Abstract: A turbine wheel flow measuring transducer is provided for measuring low flow rates of corrosive fluids, whether fluids or gases. The transducer has a turbine wheel rotating in a housing fluid chamber at a rate set by the corrosive fluid flowing through the housing. Infrared light from an optical flow measurement circuit passes through spaced holes in the rotating turbine wheel. The amount of light which passes through the wheel indicates flow rate. The housing is made from a corrosion resistant synthetic resin which is also translucent to infrared light from the light source. The light source thus need not be in the housing fluid chamber, materially simplifying the transducer. Further, the turbine wheel is provided with an improved bearing support so that problems of thermal expansion of the housing are overcome.

Abstract: A scanning system (10) for reading bar code symbols including a portable hand-held scanning device (12) is provided. The portable hand-held scanning device (12) generates electrical signals descriptive of the bar code symbols and includes a manually actuatable trigger switch (26) for initiating reading of the bar code symbols each time the manually actuatable trigger switch (26) is actuated by the user when the portable hand-held scanning device (12) is supported by the user. The scanning system (10) further includes a fixture (14) for receiving and supporting the portable hand-held scanning device (12). The fixture includes a head portion (42) and a base portion (40). The hand-held scanning device (12) is supported by the head portion (42) a predetermined distance above the base portion (40) to allow objects bearing the bar code symbols to pass between the head portion (42) and the base portion (40).

Abstract: A reading device which uses both optical character recognition techniques and magnetic reading are combined in a reader wherein the magnetic reading head stays at a fixed position while the optical reading aperture may be varied to accomodate different documents. The slot through which checks, credit cards or other similar documents are passed is movable vertically to adapt to different media from which information is to be read.

Abstract: Described is a light pipe for transmitting light signals to and from a transmitter/receiving sensor. The light pipe is a homogeneous body made by injection molding an arcylic plastic material.

Abstract: A method and system is provided for driving a self-scanned photosensor array at high sensor cell scan rates, and sampling the sensor cells serially addressed by the array without comprising either image integrity or array frame rate.End of line (EOL) and end of frame (EOF) timing signals generated by the array are sensed and operated upon to limit the voltage amplitude swings of the signals, and to reduce noise modulation in the output video signal. A single synchronization signal is formed from the timing signals to accurately identify the last cell of a frame to be scanned, and to synchronize a row counter driving one of two flip-flops providing biphase array clock signals as the flip-flops have minimal pulse skew between complementary outputs, the effects of fixed pattern odd/even noise in the output video signal are substantially reduced. Further, the flip-flops uniquely provide large voltage amplitude swings without attendant heat generation problems.