Measuring and testing – Fluid pressure gauge – U-tube liquid column
Patent
1983-01-06
1984-07-24
Swisher, S. Clement
Measuring and testing
Fluid pressure gauge
U-tube liquid column
73706, 200 816, 324 714, G01L 718, H01H 2928
Patent
active
044611811
ABSTRACT:
A manometer is provided for metering samples of fluid flowing in devices wherein particle concentration in the fluid is being counted or measured. Such devices include particle counters for determining blood cell concentration in body fluid. The device includes low permeable stretchable diaphragms in the device connections for containing the mercury therein, and a slide valve in the vent connection to restrict the movement of the mercury during storage or shipment. The arrangement herein includes, also, a one-way valve downstream of the "stop" point to stop flow substantially immediately upon the cessation of the measurement interval to reduce unwanted airflow to the counting aperture. A start and stop arrangement in the mercury flow path for causing the leading edge of the mercury meniscus at the axis thereof to engage the electrode contacts includes simple wire tips extending into the mercury flow path to the axis thereof for engaging the axis of the mercury meniscus. A preset fixed sample volume metering chamber is provided which eliminates the need for calibration.
REFERENCES:
patent: 1642615 (1927-09-01), Lommel
patent: 1917637 (1933-07-01), Dwyer
patent: 1997437 (1935-04-01), Smith
patent: 2475602 (1949-07-01), Forst
patent: 2819616 (1958-01-01), Hinkle
patent: 2869078 (1959-01-01), Coulter
patent: 3122924 (1964-03-01), Pall
patent: 3208284 (1965-09-01), Rivero
patent: 3248948 (1966-05-01), Keller
patent: 3433077 (1969-03-01), Gilmont
patent: 3446076 (1969-05-01), Dieterich
patent: 3492871 (1970-02-01), Rainero
patent: 3541858 (1970-11-01), Bonczek
patent: 3611811 (1971-10-01), Lissau
patent: 3921006 (1975-11-01), Pontigny
Becton Dickinson and Company
Grindle R. P.
Swisher S. Clement
LandOfFree
Control for sample volume metering apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control for sample volume metering apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control for sample volume metering apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-93486