Title: Liquid level detecting devices

Abstract: A liquid level detecting device for vapour generators is characterized by a stack tube for connection to the vapour generator and preferably two separate side tubes in the form of loops each having an upper vapour inlet to the stack tube and a lower outlet disposed respectively at a low water level and a high water level. In use the loops fill with cooled condensate. When the water level moves past either of the cooling tube outlets the condition of that tube is disturbed, and the cooled water is displaced from one portion of the loop to another and steam occupies the previously cooled portion of the tube. The temperature change is sensed and used to give an alarm.

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Inventors: Benham, Hugh Michael (London, EN)

Application Number: 433408
Filing Date: 1974-01-14
Publication_date: 1976-02-03
Assignee: ABTEC Limited (London, EN)
Primary Class(es): 73/295 116/109, 340/622
Other Classes:
US Patent Ref:

2091319	Aug, 1937	Howse et al.	116/109.
2632419	Mar, 1953	Topping	116/109.
3048036	Aug, 1962	Van Ham	73/290.
3132514	May, 1964	Plessinger	73/295.
3512412	May, 1970	Weining	73/295.

Other Refs: 447,843

Apr, 1948	CA

Primary Examiner: Queisser, Richard C.
Assistant Examiner: Roskos, Joseph W.
Attorney: Oblon, Fisher, Spivak, McClelland & Maier