Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1981-11-30
1984-05-22
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
With particular system function
324 711, G08B 2900, G01N 2700
Patent
active
044504357
ABSTRACT:
A debris alarm device for use with a particle analyzing apparatus of the Coulter.RTM. type generates discrete particle pulses in response to liquid suspended particles passing through a sensing aperture, the debris alarm comprising threshold circuitry for generating a threshold pulse for each particle pulse; circuitry for generating, for each threshold pulse, a normal pulse of predetermined duration; a first current source and a second current source for providing currents of opposite polarity to an integrator, when said current sources are triggered, respectively, by the threshold pulses and the normal pulses; and debris indicator circuitry, including an alarm, for determining when the output voltage of the integrator, which initially is set to zero, falls out of a predetermined voltage window. In an alternative embodiment, the same polarity first and second currents are fed to separate integrators and the debris indicating circuit detects when the outputs of the two integrators exceed a preset relative percent difference and thereafter enables the alarm.
REFERENCES:
patent: 2656508 (1953-10-01), Coulter
patent: 3259842 (1966-07-01), Coulter et al.
patent: 3259891 (1966-07-01), Coulter et al.
patent: 3444463 (1969-05-01), Coulter et al.
patent: 3700867 (1972-10-01), Gogg
patent: 3733547 (1973-05-01), Coulter et al.
patent: 3757213 (1973-09-01), Coulter et al.
patent: 3801901 (1974-04-01), Hogg
patent: 3820019 (1974-06-01), Doty et al.
patent: 3882385 (1975-05-01), Coulter et al.
patent: 4001678 (1977-01-01), Berg
patent: 4212175 (1983-10-01), Maynarez
Caldwell Sr. John W.
Hibnick Gerald R.
James Bobby Dencil
Myer Daniel
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