Processing

Please wait...

Settings

Settings

Goto Application

1. WO2000033035 - LIQUID LEVEL GAUGE

Publication Number WO/2000/033035
Publication Date 08.06.2000
International Application No. PCT/US1999/022154
International Filing Date 24.09.1999
Chapter 2 Demand Filed 17.05.2000
IPC
G01F 23/292 2006.1
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
23Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
22by measurement of physical variables, other than linear dimensions, pressure, or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
28by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
284Electromagnetic waves
292Light
CPC
G01F 23/2925
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
23Indicating or measuring liquid level, or level of fluent solid material, e.g. indicating in terms of volume, indicating by means of an alarm
22by measurement of physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
28by measuring the variations of parameters of electric or acoustic waves applied directly to the liquid or fluent solid material
284Electromagnetic waves
292Light ; , e.g. infra-red or ultra-violet
2921for discrete levels
2922with light-conducting sensing elements, e.g. prisms
2925using electrical detecting means
Applicants
  • CASCO PRODUCTS CORPORATION [US]/[US]
Inventors
  • SANDER, Willy, M.
  • MATTIS, Donald
Agents
  • BITTMAN, Mitchell, D.
Priority Data
09/204,79003.12.1998US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) LIQUID LEVEL GAUGE
(FR) INDICATEUR DU NIVEAU DE LIQUIDE
Abstract
(EN) A liquid level gauge for a tank or vessel, consists of a p-c board (22) having electrical circuitry thereon, a light source (66) mounted on and connected to the p-c board to direct light laterally thereof, and a light-responsive device (68) mounted on and connected to the p-c board to receive light which is directed to the board laterally thereof. There is a tubular probe (54, 56) connected with the p-c board (22), providing a path for light from the source to travel to the tip of the probe. The probe tip (70) is conical and as such, provides a similar path for light reflected therefrom, to travel back to the light-responsive device, depending on whether or not the tip is immersed in liquid. The tip (70) of the probe (54, 56) is provided with an extension (72) which functions to break any drops that might otherwise form due to capillarity or surface tension of the liquid. Thus, when the liquid level in the tank falls below the tip, for the most part, residual liquid is substantially completely drawn off from the area around the cone of the tip. There is thus encountered no interference from erroneous reflections arising from liquid drops at the tip.
(FR) L'invention concerne un indicateur du niveau de liquide conçu pour un réservoir ou une cuve, comprenant une carte à circuit imprimé (22) sur laquelle repose un circuit électrique, une source de lumière (66) montée sur et reliée à la carte à circuit imprimé de manière à orienter la lumière latéralement ainsi qu'un dispositif photosensible (68) monté sur et relié à la carte à circuit imprimée de manière à recevoir la lumière qui est dirigée latéralement vers la carte. On prévoit aussi une sonde tubulaire (54, 56) reliée à la carte à circuit imprimé (22) assurant une trajectoire à la lumière de la source en direction du bout conique (70) de la sonde. Ce bout assure, en fonction de son immersion ou non dans le liquide, une trajectoire similaire à la lumière réfléchie sur le dispositif photosensible. Le bout (70) de la sonde (54, 56) présente un prolongement (72) servant à empêcher que des gouttes ne tombent à cause de la capillarité et de la tension superficielle du liquide. Aussi, lorsque le niveau du liquide contenu dans le réservoir descend en-dessous du bout, la plus grande partie du liquide restant est presque complètement éliminée de la zone entourant le bout conique. Les erreurs de réflexion dues aux gouttes de liquide sur le bout n'entraînent donc aucune interférence.
Latest bibliographic data on file with the International Bureau