GB1466269A - Liquid-level sensors - Google Patents

Liquid-level sensors

Info

Publication number
GB1466269A
GB1466269A GB1843973A GB1843973A GB1466269A GB 1466269 A GB1466269 A GB 1466269A GB 1843973 A GB1843973 A GB 1843973A GB 1843973 A GB1843973 A GB 1843973A GB 1466269 A GB1466269 A GB 1466269A
Authority
GB
United Kingdom
Prior art keywords
thermistor
leads
holder
liquid
encapsulated
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
GB1843973A
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.)
Philips Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB1843973A priority Critical patent/GB1466269A/en
Publication of GB1466269A publication Critical patent/GB1466269A/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)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Level Indicators Using A Float (AREA)

Abstract

1466269 Liquid level indication MULLARD Ltd 29 April 1974 [17 April 1973] 18439/73 Headings G1H and G1N A liquid level sensor, e.g. for sensing the water, oil or brake fluid level in a vehicle or the water level in a washing machine, comprises an encapsulated semi-conductor thermistor 4 secured to one side of a holder 2 through which extend tubular connectors 9, 10, in which electrical leads 5, 6 to the thermistor are secured, the thermistor being adjacent a wall of its encapsulation so as to allow heat exchange between the thermistor and any liquid surrounding the sensor. The thermistor 4 may be encapsulated in, and soldered to one wall of, a sealed metal can 3 as shown in Fig. 2, the lead 6 being connected to the can wall and the lead 5 via a metal strip 8 to the thermistor 4, both leads 5, 6 extending through a glass seal 7. Instead of a can, the thermistor can be encapsulated in a glass coating. The holder 2, for attachment to the wall of a liquid container, is of plastics, e.g. polypropylene, or other insulating material and comprises a boss 21, shoulder portion 22 and two partially cylindrical lugs (25), 26 to be positioned around the encapsulated thermistor. As in Figs. 4-6 (not shown) holes (27), (28) in the holder 2 accommodate the tubular connectors 9, 10 for external leads 15, 16 connected to leads 5, 6. In an alternative embodiment Figs. 7-10 (not shown) the holder 2 has two main body portions (30), (31) connected by two struts (32), (33) which accommodate the tubular connectors 9, 10. The leads 15, 16 may be connected in series with a battery (18) and signal lamp (17), as in Fig. 3 (not shown), such that the lamp will light or not depending on whether the sensor is immersed in liquid.
GB1843973A 1974-04-29 1974-04-29 Liquid-level sensors Expired GB1466269A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1843973A GB1466269A (en) 1974-04-29 1974-04-29 Liquid-level sensors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1843973A GB1466269A (en) 1974-04-29 1974-04-29 Liquid-level sensors

Publications (1)

Publication Number Publication Date
GB1466269A true GB1466269A (en) 1977-03-02

Family

ID=10112465

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1843973A Expired GB1466269A (en) 1974-04-29 1974-04-29 Liquid-level sensors

Country Status (1)

Country Link
GB (1) GB1466269A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6685296B2 (en) 2000-06-16 2004-02-03 Canon Kabushiki Kaisha Ink tank and ink jet recording apparatus provided with the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6685296B2 (en) 2000-06-16 2004-02-03 Canon Kabushiki Kaisha Ink tank and ink jet recording apparatus provided with the same
US6997535B2 (en) 2000-06-16 2006-02-14 Canon Kabushiki Kaisha Ink tank and ink jet recording apparatus provided with the same

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Legal Events

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