Indicator and limit value alarm device
AssigneeDr. Eduard Fresenius Chemisch-pharmazeutische Industrie KG, Apparatebau KG
InventorsHorst Ewert, Wilfried Schael
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Abstract
The present electronic indicator or display device is equipped with adjustable upper and/or lower limit value markers to provide a respective alarm if such limit values are exceeded or not reached. The display itself comprises an electronic circuit and optical display elements such as light emitting diodes connected to the display circuit. An input to the display circuit is adapted to receive rated or limit value input signals which are displayed as respective markers and the position of which is adjustable. A time multiplexing circuit controls the timed sequence of the signals supplied to the display elements. A comparator compares the measured signal value with the rated value or values and monitors the proper function of the system.
Claims11
An indicator and limit value alarm circuit arrangement, comprising analog multiplexing means (103) including input means (105, 106;
- 111, 112, 113) for supplying input values including measured value representing signals, rated value representing signals, and limit value representing signals to said analog multiplexing means (103), clock generator means (104) operatively connected to said analog multiplexing means (103) for sequentially processing said signals through said analog multiplexing means, said clock generator means providing a clock signal having a clock frequency above the resolution of the human eye, display means (101) comprising a plurality of display elements arranged in a row, analog-to-digital converter means (101) operatively interconnecting said display means to said analog multiplexing means whereby any one of said display elements may be energized sequentially, said clock frequency assuring a simultaneous display to the observer, said clock generator means controlling said analog multiplexing means in such a manner that the switched-on durations differ for different input values for distinguishing said different input values on said display means by the different brightnesses resulting from said different switched-on durations.
Dependencies are inferred from the claim text.