Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-02-20
1998-08-25
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340620, 340622, 340654, 73290R, 73291, 73292, G08B 2100
Patent
active
057986983
ABSTRACT:
In cases of application where the critical temperature occurs or could occur, safe monitoring of the level of the liquid was not possible heretofore because the physical properties of the liquid and of the gaseous medium present above the latter in the container no longer differ at this temperature. The method includes the temperature in the container in the monitoring of the level of the liquid. Below a lower comparative temperature value (Tu), the output signal of the evaluator unit is determined by the measuring signal of the level sensor. The measuring signal of the level sensor is disregarded above this value (Tu). The evaluator unit supplies an output signal that is on the safe side with respect to the level of the liquid. The comparative temperature (Tu) is below the critical temperature to an extent such that the inaccuracies in the measurement of the level sensor and the temperature sensor have no interfering effect.
REFERENCES:
patent: 3893108 (1975-07-01), McBride, Jr. et al.
patent: 5211904 (1993-05-01), Oosterkamp
patent: 5253521 (1993-10-01), Abramovich et al.
Borchers Kerstin
Politt Joachim-Christian
Schroter Holger
Gestra GmbH
Hofsass Jeffery A.
Lieu Julie
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