Title: Safe start checking liquid processing system

Abstract: A self checking system is disclosed in various forms, and is specifically shown as applied to a system which checks the level of water in a boiler before an associated fuel burner system is initiated. Before the liquid or water in the system can be processed, the liquid level is either caused to be depressed or is simulated as depressed, and this depression in the liquid level is sensed and the level verified before a circuit is completed in the liquid processing system.

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Inventors: Deziel, Frederick T. (Bloomington, MN, US)

Application Number: 669777
Filing Date: 1976-03-24
Publication_date: 1978-04-18
Assignee: Honeywell Inc. (Minneapolis, MN)
Primary Class(es): 122/504 340/618, 392/458
Other Classes:
US Patent Ref:

3109415	Nov, 1963	Rowell	122/504.
3834357	Sep, 1974	Kaczmarek et al.	122/504.
4007713	Feb, 1977	De Leonardis et al.	122/504.

Other Refs:
Primary Examiner: Wayner, William E.
Assistant Examiner:
Attorney: Feldman; Alfred N.