124 PatentsAL ER T

displays data in either text or graphics formats. Data including flow-related data, fluid condition data, as well as data from external devices, may be transferred from the data memory of the apparatus to an external computer, printer, or the like by use of a hand-held data transfer unit or a modem integrally provided in the apparatus.

collected and sample analysis is performed automatically to generate a certification report in approximately one-third the time presently required.

5509306

THERMAL TYPE FLOWMETER

5507190

FLOWMETER WITH IMPROVED END STOPS

Guttmann Emil J Morton Grove, IL, UNITED STATES assigned to Cole-Parmer Instrument Company

A flowmeter for measuring fluid flow rates in a controlled environment. The flowmeter has an inlet and an outlet and has a vertically disposed conduit and an appropriately dimensioned float disposed within the conduit to move vertically therein. The float moves in response to the opposing forces of the weight of the float and an upward force exerted on the float by an upward fluid flow longitudinally traversing the conduit. The flowmeter also comprises an inlet end stop disposed at the inlet end of the conduit. The inlet end stop comprises a base section and a flow-divider section, and, preferably, an upright section. The flow-divider section comprises a raised, transversely extending partitioning member. The partitioning member obstructs the vertical fluid flow emerging centrally from the bore thereby causing the fluid flow to diverge into a plurality of flow streams which divergently angle outwardly and upwardly toward the tapered inner surface of the conduit. The divergent flow streams are particularly effective in lowering the threshold fluid flow required to liR an annular float.

Yamamoto Noboru; Sugiura Yasushi assigned to Nippondenso Co Ltd

Kariya, JAPAN

A thermal type flowmeter for measuring a flow rate of a fluid which is equipped with a thermo-sensitive resistor provided within a fluid passage and arranged to heat while being energized. The flowmeter includes an electric power adjusting element provided in series with the thermo-sensitive resistor for adjusting the amount of electric power to be supplied to the thermo-sensitive resistor based on a current inputted to its input terminal. It also includes a constant current source circuit connected to said input terminal of the electric power adjusting element for supplying a predetermined constant current to the input terminal of the electric power adjusting element. A control circuit outputs an adjustment signal to adjust an amount of electric power supplied to the thermo-sensitive resistor so that the thermo-sensitive resistor has a predetermined temperature. A current adjusting circuit connected to the input terminal of the electric power adjusting element divides the constant current from the constant current source circuit in accordance with the adjustment signal from the control circuit so as to adjust the input current to the electric power adjusting element. This arrangement can reduce the minimum operating voltage for the flowmeter because the input current of the electric power adjusting element can be obtained from the constant current source circuit.

5509311

5507192

AUTOMATED GAS MEASUREMENT SYSTEM

Beaudin Allen Laguna Niguel, CA, UNITED STATES

A automated system includes a set of probes used to conduct gas flow measurement and sample gas collection. A mobile unit transports the automated gas measurement system to the test facility, and the devices are easily and quickly assembled for testing at standard ports located around a smoke stack or exhaust duct. Two or four probes automatically and simultaneously perform leak checks, calibrations, and purging. At each of the traverse points to be tested, stepping motors provide precise automatic positioning with commands from programmable logic controllers interfacing with a computer located in the mobile unit. Measurement data is

DYNAMICALLY ISOLATED VORTEX SENSING PRESSURE TRANSDUCER

Lew Hyok S Arvada, CO, UNITED STATES

A vortex flowmeter employs a differential pressure transducer converting an oscillation in a differential pressure to an alternating electrical signal, which differential pressure transducer is dynamically isolated from a structure including a flow passage in a relationship preventing the transmission of the mechanical vibrations of the structure including the flow passage to the differential pressure transducer, and receives two fluid pressures respectively existing at the two opposite cylindrical sides of a vortex generating bluff body disposed across the flow passage respectively through two small diameter tubings having a low stiffness, wherein the velocity of fluid moving through the flow passage is determined as a function of the frequency of the alternating electrical signal generated by the differential pressure transducer.