G - Physics – 01 – F
Patent
G - Physics
01
F
354/31, 341/38
G01F 1/68 (2006.01) G01F 1/684 (2006.01) G01F 1/696 (2006.01) G01F 1/698 (2006.01) G01P 5/12 (2006.01)
Patent
CA 1321266
AIR VELOCITY TRANSMITTER DEVICE Abstract of the Disclosure An air velocity transmitter device that is arranged to measure air, velocity (with minimum influence of ambient temperature), and over a wide range of temperatures and velocities, and provide an electrical output signal that is linear with respect to air velocity and is independent of the temperature variations of the measured air flow, for controlling commercial and industrial energy management systems, and especially wherever air flow is to be measured and controlled; the device comprises a unit having an anemometer type probe that is employed to measure the air flow, and a housing containing electronic circuitry that, when powered by either an alternating or direct current power supply provides a signal in the industry preferred 4-20 milliamp range. The probe has two sensing elements; one is a self heated thermistor that serves as the air velocity sensor, and a second sensing element in the form of a chip thermistor, that are separately but simultaneously exposed, in the use of the instrument probe, to the air flow, with the the self heated thermistor and the thermistor chip are incorporated in a self regulating bridge circuit, that, when the unit is powered, generates a non-linear signal that is applied to signal processing circuitry within the unit housing to adjust same for gain and off set with the resulting signal being applied to a linearizer circuit also within the unit housing wherein the signal is electronically processed to supply the unit output signal in the familiar 4-20 milleamp range. The transmitter device is arranged to be powered by either an alternating current or direct current supply that is in the range of about 22 volts to about 28 volts.
600894
Dwyer Instruments Inc.
Macrae & Co.
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