Measuring and testing – Liquid level or depth gauge – With other measuring device
Patent
1992-01-22
1993-09-14
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
With other measuring device
33715, 33716, 33720, 318642, 374142, G01F 2300, G01F 2322
Patent
active
052438600
ABSTRACT:
The invention relates to apparatus (1) for monitoring the level of a liquid within a vessel (3). The apparatus comprises a surface following sensing head (5) adapted to follow the surface (7) of the liquid. A gauging head (9) is mounted outside the vessel (3) at pre-determined fixed distance from the vessel (3). Rotatably mounted within the gauge head (9) is a reel (11) which has wound upon it a flexible elongate tape (13) having its free end (15) connected to the sensing head (5). The flexible tape (13) passes along a defined path of fixed length from the reel (11) to a reference point above the vessel and includes a plurality of level markers (17) which are equally spaced one from another along the length of the tape (13) each pair of adjacent markers (17) being of pre-determined fixed distance apart. A stepper motor (19) is mounted within the gauging head (9) and coupled to the reel (11) to rotate the reel (11) about its axis in two opposite directions. A step counter (21) is coupled to the stepping motor (19) to count the number of steps stepped by the motor (19) in the direction in which the steps are taken. A guide (23) has mounted within it a marker (25) through which the tape (13) passes to detect the presence or absence of the marker (17). A microprocessor (27) is mounted within the gauging head (9) and is coupled to the marker detector (25) and the step counter (21) to calculate and display the exact level of the liquid by calculating the Ullage.
REFERENCES:
patent: 4061901 (1977-12-01), Saunders et al.
patent: 4065968 (1978-01-01), Sunagawa
patent: 4255859 (1981-03-01), Klieman
patent: 4942351 (1990-07-01), Kronan
Enraf Nonius Delft, Specification Sheet 802-1-E, Solid State Reliability with Enraf 802 Series Precise Level Gauges, Nov. 1976.
Whessoe, Jaugeur Asseryi Type 1140, FIG. 1140 Servo Gauge, The Highest Degree of Accuracy in Level Measurement.
Enraf Nonius, Series 854 Advanced Technology Gauge, The Inventory Gauging System for the 90s.
Whessoe plc
Yasich Daniel M.
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