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US3855480A Expired / Lapsed US ⏱️ 0.0 years remaining

Fault-indicating circuit for a flow-metering system

Assignee: Merestechnikai Kozponti Kutato Laboratorium
•
Filing: 1973-11-14
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Granted: 1974-12-17
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Expires: 1993-11-14
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Abstract

Abstract The flow metering system includes a unit for establishing a flow of fluid through a fluid conduit, a unit for generating an electrical flow velocity signal indicative of the velocity of fluid flow through the conduit, a unit for registering the value of the electrical flow velocity signal over a period of time in order to determine the quantity of fluid passing through the conduit during such period of time, a source of biasing voltage for the registering unit, and an arrangement for simply determining the existence or nonexistence of fluid flow in the conduit. A fault-indicating circuit includes a first transistor having a base connected to receive a voltage corresponding to the electrical flow velocity signal, and a second transistor having a base connected to the collector of the first transistor. The collectors of the two transistors receive biasing voltages corresponding to the output voltage of the source of biasing voltage for the registering unit. The circuit includes a third transistor having an emitter connected to the emitter of the first transistor, and a parallel RC circuit connected across the base-emitter junction of the third transistor. A first charging circuit branch is connected between the emitter of the second transistor and the base of the third transistor and is operative for charging the capacitor of the parallel RC circuit with current flowing through the collector-emitter path of the second transistor. A second charging circuit branch is connected to the base of the third transistor and is connected to the unit which determines the existence or non-existence of fluid flow and is operative for charging the capacitor by applying to the input of the second charging circuit branch a predetermined voltage when the unit which detects the existence or non-existence of fluid flow in said conduit detects the existence of fluid flow in said conduit. A warning arrangement includes a fourth transistor having a base-emitter junction connected across the collectoremitter path of the third transistor and an indicating lamp connected between the collectors of the second and fourth transistors. The base of the fourth transistor is connected to the collector of the second transistor, and a relay is connected across the collector-emitter path of the fourth transistor.

Inventors

  • 👤 G Striker
  • 👤 B Gyurusi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 14:27
CPC Classifications
G; G01; G01F; G01F15/00; G01F15/02; G01F15/022; G01F15/024

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 371 words
In a flow metering system comprised of a fluid conduit, means for establishing a flow of fluid through said conduit, means for generating an electrical flow velocity signal indicative of the velocity of fluid flow through said conduit, means for registering the value of said electrical flow velocity signal over a period of time in order to determine the quantity of fluid passing through said conduit during such period of time, a source of biasing voltage for said means for registering, and means for detecting the existence or non-existence of fluid flow in said conduit, in combination therewith, a fault-indicating circuit including a first transistor, means for applying to the base of said first transistor a voltage corresponding to said electrical flow velocity signal, a second transistor having a base connected to the collector of said first transistor, means for applying to the collectors of said transistors a biasing voltage corresponding to the output voltage of said source of biasing voltage, a third transistor having an emitter connected to the emitter of said first transistor, a parallel RC circuit comprised of the parallel connection of a resistor and a capacitor connected across the base-emitter junction of said third transistor, a first charging circuit branch connected between the emitter of said second transistor and the base of said third transistor and operative for charging said capacItor with current flowing through the collector-emitter path of said second transistor, means including a second charging circuit branch connected to the base of said third transistor and connected to said means for determining the existence or non-existence of fluid flow and operative for charging said capacitor with current by applying to the input of said second charging circuit branch a predetermined voltage when said means for detecting the existence or nonexistence of fluid flow in said conduit detects the existence of fluid flow in said conduit, and warning means comprising a fourth transistor having a base-emitter junction connected across the collector-emitter path of said third transistor, an indicating lamp connected between the collectors of said second and fourth transistors, means connecting the base of said fourth transistor to the collector of said second transistor, and a relay connected across the collector-emitter path of said fourth transistor.
Claim 2
Dependent Claim 371 words
In a flow metering system comprised of a fluid conduit, means for establishing a flow of fluid through said conduit, means for generating an electrical flow velocity signal indicative of the velocity of fluid flow through said conduit, means for registering the value of said electrical flow velocity signal over a period of time in order to determine the quantity of fluid passing through said conduit during such period of time, a source of biasing voltage for said means for registering, and means for detecting the existence or non-existence of fluid flow in said conduit, in combination therewith, a fault-indicating circuit including a first transistor, means for applying to the base of said first transistor a voltage corresponding to said electrical flow velocity signal, a second transistor having a base connected to the collector of said first transistor, means for applying to the collectors of said transistors a biasing voltage corresponding to the output voltage of said source of biasing voltage, a third transistor having an emitter connected to the emitter of said first transistor, a parallel RC circuit comprised of the parallel connection of a resistor and a capacitor connected across the base-emitter junction of said third transistor, a first charging circuit branch connected between the emitter of said second transistor and the base of said third transistor and operative for charging said capacItor with current flowing through the collector-emitter path of said second transistor, means including a second charging circuit branch connected to the base of said third transistor and connected to said means for determining the existence or non-existence of fluid flow and operative for charging said capacitor with current by applying to the input of said second charging circuit branch a predetermined voltage when said means for detecting the existence or nonexistence of fluid flow in said conduit detects the existence of fluid flow in said conduit, and warning means comprising a fourth transistor having a base-emitter junction connected across the collector-emitter path of said third transistor, an indicating lamp connected between the collectors of said second and fourth transistors, means connecting the base of said fourth transistor to the collector of said second transistor, and a relay connected across the collector-emitter path of said fourth transistor.
Claim 3
Dependent Claim 35 words
The system defined in claim 1, wherein said first charging circuit branch comprises the series connection of a charging resistor and a charging diode, and wherein said second charging circuit branch comprises a charging diode.
Claim 4
Dependent Claim 26 words
The system defined in claim 2, wherein said means connecting the base of said fourth transistor to the collector of said second transistor comprises a resistor.

References Cited (Backward Citations)

US3008131A Cited
US3202804A Cited
US3318479A Cited
US3246176A Cited
US3408940A Cited
US3446986A Cited
US3443438A Cited
US3618069A Cited
US3626370A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-12-16 1978-06-17 1978-12-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-12-16 1982-06-17 1982-12-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-12-16 1986-06-17 1986-12-17 $7700.00 Window Closed / Lapsed

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