Indicator circuit for a concentration measuring apparatus

Details Indicator circuit for a concentration measuring apparatus Indicator circuit for a concentration measuring apparatus

1991-01-15

1992-01-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356224, G01N 2100

Patent

active

050830368

ABSTRACT:
An indicator circuit is provided for an apparatus that measures the concentration of a selected component in a test sample. The apparatus generates a test voltage that represents the concentration of the component in the test sample. The circuit generates a series of range voltages, each of which represents a respective one of a series of potential concentration ranges of the component in the test sample. A switching circuit selects an adjacent pair of range voltages immediately above and below the test voltage and applies the selected range voltages across an incremental voltage divider such that the voltage difference of the selected range voltages is divided into a series of incremental voltages, each of which represents a respective one of a series of potential incremental concentration levels of the component within each concentration range. The test voltages are compared with each of the incremental concentration voltages and the actual incremental concentration level of the component in the test sample is determined. There is a group of incremental indicator elements, each of which represents and displays a respective incremental concentration level in each of the concentration ranges.

REFERENCES:
patent: 3973852 (1976-08-01), Moore et al.
patent: 4095117 (1978-06-01), Nagy
patent: 4908676 (1990-03-01), Bedell et al.

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