Device for the photometric measurement of the content of a...

Radiant energy – Invisible radiant energy responsive electric signalling – Ultraviolet light responsive means

Reexamination Certificate

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Reexamination Certificate

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07339178

ABSTRACT:
A device for photometric measurement of the concentration of a chemical substance in a solution, including: a lamp, which emits electromagnetic radiation in a predetermined wavelength range; a first receiving unit in a measuring branch (MB), which receives the radiation transmitted through the solution at a first wavelength; a second receiving unit in a reference branch (RB), which receives the radiation transmitted through the solution at a second wavelength; and a control/evaluation unit, which, depending on the conditions present at the measuring site, uses the intensity values determined either by the measurement branch (MB) or by the reference branch (RB), in order to control the intensity of the radiation emitted by the lamp, such that the resulting, measured values are highly plausible.

REFERENCES:
patent: 4627284 (1986-12-01), Gersh et al.
patent: 4873470 (1989-10-01), Myers
patent: 5745243 (1998-04-01), Wilcox et al.

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