Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1997-01-06
1998-08-25
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
34030915, 2503381, 25033911, G08B 2100
Patent
active
057986991
ABSTRACT:
An improved method and apparatus for monitoring, in real time, the quality of a flowing fluid stream and of automatically taking samples therefrom when the level of particulate matter in the flow stream exceeds an acceptable limit for a predetermined period of time. The apparatus includes a particle monitor and at least one three-way valve electronically linked via a programmable logic controller to the particle monitor. Not only is the latter an instrument for continuously measuring, on-line, numbers known as particle indices which are indicative of particulate matter concentrations in the flow stream, but also the particle monitor generates electronic signals. Both these signals and the particle index are proportional to fluctuations in the intensity of a light beam traversed by particles which are present in a portion of the flow stream during a fixed interval of time. Importantly, the particle monitor can detect relatively short-lived "spikes" in the level of 0.50 micron or larger particles which may be present in the flow stream. Utilizing this sensitivity of the particle monitor to such "spikes", the apparatus can be set to automatically take samples when excursions in the levels of particulate matter occur rather than at random intervals. As a result, the method can facilitate the diagnosis of an impending process equipment breakdown/malfunction in its early stages, while its observable effect is only an infrequent "spike".
REFERENCES:
patent: 3845480 (1974-10-01), Steinberg
patent: 4639718 (1987-01-01), Gasper
patent: 5578995 (1996-11-01), Bryant et al.
Bryant Robert L.
Veal Charles R.
Chemtrac Systems, Inc.
Hofsass Jeffery
Leon Harry I.
Lieu Julie B.
Steadman Vivian L.
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