Fluid level detector test switch

Details Fluid level detector test switch Fluid level detector test switch

1979-03-21

1980-09-23

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular system function

340603, 340612, 340616, 340620, 324 65P, 307116, 361178, 73290R, 73304R, 137392, 200 612, G08B 2900, G01R 2702, G01F 2300, H01N 4712

Patent

active

042246067

ABSTRACT:
A fluid level control circuit with a safety test function for a boiler water level probe of a fail safe type is connected to a field effect transistor controlled amplifier having a well defined threshold of operation. A safety test switch means is provided to pull the amplifier's input down below the threshold point, but not to a shorted condition. By observing the output of the system it is possible to determine whether the fluid level detector is properly installed, and whether the amplifier has had any type of unsafe operating failure.

REFERENCES:
patent: 3593270 (1971-07-01), Walker
patent: 3683347 (1972-08-01), Melone
patent: 3834357 (1974-09-01), Kaczmarek et al.
patent: 4007713 (1977-02-01), De Leonardis et al.
patent: 4027172 (1977-05-01), Hamelink
patent: 4053874 (1977-10-01), Glaser

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