Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-03-21
1998-04-14
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340590, 116268, 116272, G08B 2100
Patent
active
057397554
ABSTRACT:
A sensor for monitoring a cooling liquid circulating in a circuit of a heat exchanger of an automobile, for example, includes a support for mounting the sensor on a pipe of the circuit so that the liquid is in contact with at least a part of the sensor, a corrodible membrane in contact with the liquid, and a visual indicator reacting to the degree of corrosion of the liquid. The visual indicator includes a piston movable under the combined effect of the breaking of the corrodible membrane and of the pressure difference between inside and outside of the pipe, at least one seal mounted on the movable piston, and the visual indicator protruding from the pipe and/or from the support when the membrane is corroded.
REFERENCES:
patent: 3068831 (1962-12-01), Witchell
patent: 3402690 (1968-09-01), Willis
patent: 4147596 (1979-04-01), Baboian et al.
patent: 4306127 (1981-12-01), Payne
patent: 4313042 (1982-01-01), Ehrhart
patent: 4325059 (1982-04-01), Jaye
patent: 4745876 (1988-05-01), Whiting
patent: 5181536 (1993-01-01), Argyle et al.
patent: 5339764 (1994-08-01), Singbartl
Hofsass Jeffery
Institut Francais du Pe'trole
Tweel , Jr. John
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