Mark L Eldridge

US Patent:

6883389, Apr 26, 2005

Filed:

Aug 21, 2003

Appl. No.:

10/644842

Inventors:

Mark F. Eldridge - Monterey CA, US

Assignee:

Eldridge Products, Inc. - Monterey CA

International Classification:

G01F001/46

US Classification:

7386165

Abstract:

A flow meter of the pitot type. The meter incorporates a series of apertures along a probe body for exposure to a fluid stream. The result is a number of datum which are averaged and correlated to be representative of the flow within a conduit. Aberrations encountered in noncircular ducting or other irregularities are compensated by correction. The disclosure further sets forth the use of an apparatus to effect the measurements.

US Patent:

7054767, May 30, 2006

Filed:

Feb 12, 2004

Appl. No.:

10/776321

Inventors:

Mark F. Eldridge - Monterey CA, US

Assignee:

Eldridge Products, Inc. - Monterey

International Classification:

G01F 17/00

US Classification:

702 50, 7317012

Abstract:

A thermal mass flowmeter with temperature correction. The flowmeter includes a bridge, a signal conditioner, and a balancer. The balancer provides a bridge signal as feedback to the bridge that balances a flow sensor signal and the temperature sensor signal from the bridge. The flow sensor signal or the temperature sensor signal are adjusted by an overheat factor and a temperature correction factor. The temperature correction factor is determined using a predetermined function of a temperature of the fluid. Methods of determining parameters of the predefined function and using the flowmeter for determining a flow rate of the fluid are disclosed. The flowmeter provides device for determining a flow rate of a fluid over a wide range of temperature and flow rates as well as providing device for determining the temperature of the fluid.