Liquid quality monitor having a plurality of photodiodes for det

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

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Details

250575, 356343, G01N 1506, G01N 2100

Patent

active

046722165

ABSTRACT:
A power station boiler condensate water monitor employs a light-scatter cell for the detection of oil and/or particulates in the water. In order to determine background scatter levels, provision is made to alternatively pass clean water through the cell (FLUSH). The offset voltages obtained from the detector outputs when clean water is employed are compensated for differences in temperature between the boiler condensate water and the clean water before substraction from the detector outputs when boiler condensate water is employed. The monitor is capable of detecting oil levels of less than 2 parts per million.

REFERENCES:
patent: 3576558 (1971-04-01), DeVries
patent: 3770351 (1973-11-01), Wyatt
patent: 4146799 (1979-03-01), Pitt et al.
patent: 4153837 (1979-05-01), Ross
patent: 4201471 (1980-05-01), Pitt et al.
patent: 4221485 (1980-09-01), Schulze
patent: 4265535 (1981-05-01), Pitt
patent: 4265536 (1981-05-01), Carson et al.
patent: 4497577 (1985-02-01), Sato et al.

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