Liquid level measuring apparatus
This paper discusses a liquid level measuring apparatus. It comprises spaced reed switches vertically aligned for positioning in a liquid, each reed switch vertically overlapping the adjacent above and below reed switches, the longitudinal axis of the reed switches being at an angle to the vertical, a float carrying magnetic means movably positioned coaxially about the switches, the magnetic polarity of the magnetic means being vertically aligned, the magnetic means having a magnetic field in which the vertical strength is effective for sequentially and alternately actuating only one and then two switches as the float movers relative to the switches without actuating any other switches. The magnetic field is oriented relative to the reed switches and at a distance from the switches to provide a single defined actuation of each switch as the magnetic means moves relative to the switches, a digital driver circuit connected to each reed switch, and electrical indicating means, connected to the digital driver circuits, for indicating a vertical position of the float relative to the switches, wherein the reed switches, the magnetic means and the indicating means are configured so that the indicating means has a resolution corresponding to a half of the distance between the spaced reed switches.
- Assignee:
- NOV; NOV-91-015320; EDB-91-150618
- Patent Number(s):
- US 4976146; A
- Application Number:
- PPN: US 7-501407
- OSTI ID:
- 5211699
- Country of Publication:
- United States
- Language:
- English
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47 OTHER INSTRUMENTATION
DESIGN
DIGITAL SYSTEMS
FLUIDS
LEVEL INDICATORS
LIQUIDS
MAGNETS
MEASURING INSTRUMENTS
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