Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-10-22
1987-06-09
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
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.
Extance Phillip
Hancock Nicholas K.
Pitt Gilles D.
Scott Brian J.
Verrells Michael V.
International Standard Electric Corporation
Lombardi Menotti J.
Nelms David C.
Oen William L.
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