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GB1480349A - Liquid detectors - Google Patents

Liquid detectors

Info

Publication number
GB1480349A
GB1480349A GB5993473A GB5993473A GB1480349A GB 1480349 A GB1480349 A GB 1480349A GB 5993473 A GB5993473 A GB 5993473A GB 5993473 A GB5993473 A GB 5993473A GB 1480349 A GB1480349 A GB 1480349A
Authority
GB
United Kingdom
Prior art keywords
heater
thermistors
line
resistors
sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB5993473A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SPX Flow Technology Crawley Ltd
Original Assignee
APV Corp Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by APV Corp Ltd filed Critical APV Corp Ltd
Priority to GB5993473A priority Critical patent/GB1480349A/en
Priority to DE19742461323 priority patent/DE2461323A1/en
Priority to NL7416924A priority patent/NL7416924A/en
Priority to FR7500837A priority patent/FR2256398B3/fr
Publication of GB1480349A publication Critical patent/GB1480349A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring 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
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring 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 by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/246—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring 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 by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices
    • G01F23/247—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring 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 by measuring variations of resistance of resistors due to contact with conductor fluid thermal devices for discrete levels

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

1480349 Liquid detection probe A P V CO Ltd 19 Dec 1974 [28 Dec 1973] 59934/73 Heading G1N A probe for detecting whether liquid is present e.g. for use as a liquid level detector comprises a heater R16, R17 and two thermally responsive elements TH2, TH1 mounted in a sleeve 1, one element TH2 being adjacent the heater and the other TH1 remote therefrom. Sleeve 1 may be of stainless steel, the heater may be a pair of resistors R16, R17 in parallel, and the thermally responsive elements may be a pair of thermistors, the resistors and thermistors being encapsulated within the sleeve. As shown in Fig. 2, the thermistors and resistors R12, VR2, R11 form a bridge circuit which is connected between the heater power line 23 and line 21. The bridge unbalance is detected by amplifier Al, the output of which controls transistors T 2 , T 1 which control the potential of line 23 to maintain a constant temperature difference between the thermistors TH1, TH2. The current supplied to the heater to maintain the constant temperature difference is sensed by differential amplifier A2 connected across resistor R7 in the line 23 and the output of A2 operates a relay RL1 via transistor T 4 according to whether the heater current is above or below a predetermined value. Transistor T3 may be mounted on the probe and may be replaced by two transistors in cascade.
GB5993473A 1973-12-28 1973-12-28 Liquid detectors Expired GB1480349A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB5993473A GB1480349A (en) 1973-12-28 1973-12-28 Liquid detectors
DE19742461323 DE2461323A1 (en) 1973-12-28 1974-12-24 PROBE FOR DETERMINING THE PRESENCE OR ABSENCE OF A LIQUID
NL7416924A NL7416924A (en) 1973-12-28 1974-12-27 DEVICE FOR DETECTING THE PRESENCE OF A LIQUID.
FR7500837A FR2256398B3 (en) 1973-12-28 1975-01-13

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5993473A GB1480349A (en) 1973-12-28 1973-12-28 Liquid detectors

Publications (1)

Publication Number Publication Date
GB1480349A true GB1480349A (en) 1977-07-20

Family

ID=10484687

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5993473A Expired GB1480349A (en) 1973-12-28 1973-12-28 Liquid detectors

Country Status (4)

Country Link
DE (1) DE2461323A1 (en)
FR (1) FR2256398B3 (en)
GB (1) GB1480349A (en)
NL (1) NL7416924A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5691466A (en) * 1995-06-28 1997-11-25 J.T.L. Systems Ltd. Liquid-sensing apparatus and method
GB2302725B (en) * 1995-06-28 2000-02-16 Jtl Systems Ltd Heat transfer system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0008508B1 (en) * 1978-08-23 1981-10-28 LUCAS INDUSTRIES public limited company Liquid level sensing apparatus
JPS57203996A (en) * 1981-06-10 1982-12-14 Tokyo Shibaura Electric Co Device for monitoring inside of reactor
IT8353823V0 (en) * 1983-10-14 1983-10-14 Foredit Spa LEVEL MEASURING DEVICE FOR LIQUIDS PARTICULARLY FOR THE DETECTION OF THE LUBRICANT LEVEL IN INTERNAL COMBUSTION ENGINES

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5691466A (en) * 1995-06-28 1997-11-25 J.T.L. Systems Ltd. Liquid-sensing apparatus and method
GB2302725B (en) * 1995-06-28 2000-02-16 Jtl Systems Ltd Heat transfer system

Also Published As

Publication number Publication date
DE2461323A1 (en) 1975-07-10
FR2256398B3 (en) 1977-09-30
FR2256398A1 (en) 1975-07-25
NL7416924A (en) 1975-07-01

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee