Liquid level measuring apparatus

• US 4,065,968 A
• Filed: 12/29/1976
• Issued: 01/03/1978
• Est. Priority Date: 12/30/1975
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Tokyo Keikio
• Original Assignee: Kabushiki Kaisha Tokyo Keikio
• Inventors: Sunagawa, Yoshihiko
• Primary Examiner(s): Woodiel, Donald O.
• Application Number:
  US05/755,395
• Time in Patent Office: 370 Days
• Field of Search: 73/313, 73/308, 73/321, 340/236
• US Class Current: 73/313
• CPC Class Codes: G01F 23/0023 with a probe suspended by a wire or thread with floats G01F23/40
• CPC Class Codes: G01F 23/44 using electrically actuated indicating means

Abstract

A liquid level measuring apparatus consisting of a mechanism to convert the change in the liquid level into a rotational movement, a scanning apparatus to successively scan the magnetic-field generating electric conductors provided on a disc by means of a magneto-sensitive head caused to rotate by said mechanism, an electronic circuit to produce measured figures of said electric conductors scanned by said scanning apparatus as pulse signals, and a digital indicator caused to be operated by means of said signals produced by said electronic circuit.

Claims

1. A liquid level measuring apparatus comprising:

a. a mechanism to convert the change in the liquid level into the rotational movement;

b. an insulating stationary disc, through the center of which a rotary output shaft of said mechanism extends, a large number of electric conductors designed to provide a magnetic field on being energized being provided radially on one side of said disc;

c. a magneto-sensitive head, provided on an arm which forms a part of said rotary output shaft and adapted to rotate together with said rotary output shaft in parallel with said electric conductors provided on said disc in order to detect the magnetic field provided by said electric conductors and to generate a stop pulse;

d. a circuit designed to put out a total number of energization of said electric conductors, the total number corresponding to the number of electric current pulses necessary for consecutively providing the magnetic field during the time commencing with the stage when a start pulse is generated simultaneously with the generation of the magnetic field from the basic electric conductor and ending with the stage when said stop pulse is generated, as a pulse signal; and

e. a digital indicator to be operated by said pulse signal.

2. A liquid level measuring apparatus comprising:

a. a mechanism to convert the change in the liquid level into the rotational movement;

b. an insulating stationary disc, through the center of which a rotary output shaft of said mechanism extends, a large number of electric conductors designed to provide a magnetic field on being energized being provided radially on one side of said disc;

c. a magneto-sensitive head, provided on an arm which forms a part of said rotary output shaft and adapted to rotate together with said rotary output shaft in parallel with said electric conductors provided on said disc in order to detect the magnetic field provided by said electric conductors and to generate a stop pulse;

d. a pulse current output circuit (103) adapted to consecutively apply the electric current to said electric conductors of said disc on receiving a clock pulse signal (P1) from a clock pulse generator;

e. a flip-flop circuit (116) to which a reset pulse (P3) and a start pulse (P4) which is in synchronized relation with the energization of said basic electric conductor are applied;

f. a flip-flop circuit (117) to which a reset pulse (P3) and a stop pulse (P5) from said magneto-sensitive head are applied;

g. an "and" gate circuit (118) to which said clock pulse (P1) and outputs a, b each from said flip-flop circuits (116), (117) are applied; and

h. a digital indicator (170) to be operated by the output from the "and" gate.

3. A liquid level measuring apparatus comprising:

a. a mechanism to convert the change in the liquid level into the rotational movement;

b. an insulating stationary disc, through the center of which a rotary output shaft of said mechanism extends, a large number of electric conductors designed to provide a magnetic field on being energized being provided radially on one side of said disc;

c. a magneto-sensitive head, provided on an arm which forms a part of said rotary output shaft and adapted to rotate together with said rotary output shaft in parallel with said electric conductors provided on said disc in order to detect the magnetic field provided by said electric conductors and to generate a stop pulse;

d. a clock pulse generator (113) and a counter circuit (114) to which a signal from said clock pulse is appled;

e. a decoder (115) to be operated by a signal from said counter circuit;

f. a pulse current output circuit (103) adapted to consecutively energize the electric conductors one by one provided on said disc on receipt of a signal from said decoder;

g. a flip-flop circuit (116) to which a reset pulse (P3) and a start pulse (P4) which is in synchronized relation with the energization of said basic electric conductor are applied;

h. a flip-flop circuit (117) to which a reset pulse (P3) and a stop pulse (P5) from said magneto-sensitive head are applied;

i. an "and" gate circuit to which outputs a,b each from said flip-flop circuits (116), (117) are applied; and

j. a digital indicator to be operated on receipt of an output from said "and" gate circuit.