Don B Sanders

US Patent:

20030037613, Feb 27, 2003

Filed:

Aug 21, 2001

Appl. No.:

09/934194

Inventors:

Michael Mulrooney - Downers Grove IL, US
Boyce Carsella - Ingleside IL, US
Paul Myatt - Naperville IL, US
Don Sanders - Baton Rouge LA, US

International Classification:

G01F023/30

US Classification:

073/323000, 073/306000, 340/623000

Abstract:

A redundant level measuring system comprises a chamber for fluidic coupling to a process vessel whereby material level in the vessel equalizes with material level in the chamber. A float including a magnet in the chamber rises and falls with material level in the chamber. A magnet actuated visual indicator is mounted to the chamber for indicating level of the magnet in the chamber. A measurement instrument includes a probe and a measurement circuit. The instrument is mounted atop the chamber with the probe extending downwardly into the chamber. The measurement circuit measures a characteristic of the probe representing level of the material in the chamber. A shield in the chamber isolate the float from the probe.