GB1392207A - Means for indicating temperature changes - Google Patents

Means for indicating temperature changes

Info

Publication number
GB1392207A
GB1392207A GB634972A GB634972A GB1392207A GB 1392207 A GB1392207 A GB 1392207A GB 634972 A GB634972 A GB 634972A GB 634972 A GB634972 A GB 634972A GB 1392207 A GB1392207 A GB 1392207A
Authority
GB
United Kingdom
Prior art keywords
strip
temperature change
temperature
flow
duration
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
GB634972A
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.)
Canetty Clarke P E
LATTER CO Ltd A
Original Assignee
Canetty Clarke P E
LATTER CO Ltd A
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 Canetty Clarke P E, LATTER CO Ltd A filed Critical Canetty Clarke P E
Priority to GB634972A priority Critical patent/GB1392207A/en
Publication of GB1392207A publication Critical patent/GB1392207A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K5/00—Measuring temperature based on the expansion or contraction of a material
    • G01K5/48—Measuring temperature based on the expansion or contraction of a material the material being a solid
    • G01K5/56—Measuring temperature based on the expansion or contraction of a material the material being a solid constrained so that expansion or contraction causes a deformation of the solid
    • G01K5/62—Measuring temperature based on the expansion or contraction of a material the material being a solid constrained so that expansion or contraction causes a deformation of the solid the solid body being formed of compounded strips or plates, e.g. bimetallic strip
    • G01K5/70—Measuring temperature based on the expansion or contraction of a material the material being a solid constrained so that expansion or contraction causes a deformation of the solid the solid body being formed of compounded strips or plates, e.g. bimetallic strip specially adapted for indicating or recording

Abstract

1392207 Temperature change indicator A LATTER & CO Ltd and P E CANETTYCLARKE 9 May 1973 [10 Feb 1972] 6349/72 Heading G1D A temperature change, for example a temperature departure from a required temperature in a cold store for foodstuffs, is indicated by the initiation and extent of flow of microgranular material, for example sand, through an aperture which is initially closed by a bi-metallic strip. Since the dimensions of the strip-thickness t and length L are related to the strip deflection d and temperature change T by the equation where K is a constant for any given strip material suitable choice of strip dimensions will initiate strip flow at any required temperature change. The apparatus comprises a box having a sloping partition which separates an upper compartment from a lower. By reversal of the bi-metallic strip, flow may be initiated by a lowering of temperature. More than two vertically spaced compartments may be used to indicate a series of temperature variations. Layers of different coloured sand may be initially placed in the upper compartment so that the duration of a temperature change may be more easily estimated. The action of the strip may, alternatively, unlatch a ratchet wheel of a timing mechanism to record the duration. The aperture is preferably approximately eight times the grain size in diameter.
GB634972A 1972-02-10 1972-02-10 Means for indicating temperature changes Expired GB1392207A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB634972A GB1392207A (en) 1972-02-10 1972-02-10 Means for indicating temperature changes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB634972A GB1392207A (en) 1972-02-10 1972-02-10 Means for indicating temperature changes

Publications (1)

Publication Number Publication Date
GB1392207A true GB1392207A (en) 1975-04-30

Family

ID=9812872

Family Applications (1)

Application Number Title Priority Date Filing Date
GB634972A Expired GB1392207A (en) 1972-02-10 1972-02-10 Means for indicating temperature changes

Country Status (1)

Country Link
GB (1) GB1392207A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5143453A (en) * 1988-10-04 1992-09-01 G.I.R. Temperature monitoring device containing at least one element of an alloy which memorizes its shape

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5143453A (en) * 1988-10-04 1992-09-01 G.I.R. Temperature monitoring device containing at least one element of an alloy which memorizes its shape
US5335994A (en) * 1988-10-04 1994-08-09 G.I.R. Temperature monitoring device containing at least one element of an alloy which memorizes its shape

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees