WO1992003712A1 - Improvement in temperature monitoring - Google Patents
Improvement in temperature monitoring Download PDFInfo
- Publication number
- WO1992003712A1 WO1992003712A1 PCT/GB1991/001441 GB9101441W WO9203712A1 WO 1992003712 A1 WO1992003712 A1 WO 1992003712A1 GB 9101441 W GB9101441 W GB 9101441W WO 9203712 A1 WO9203712 A1 WO 9203712A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- data
- glazed window
- temperature recording
- recording
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/10—Thermometers specially adapted for specific purposes for measuring temperature within piled or stacked materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
Definitions
- This invention relates to the monitoring of temperature in a controlled temperature enclosure which is subject to occasional temperature-disturbing effects disturbing its contents.
- More especially it relates to monitoring of the temperature at any point within an open-fronted chill cabinet utilizing circulated cold air and provided for the display of and access to chilled foodstuffs.
- a typical display cabinet is a tall chest with insulated walls and an open front. It carries in the base part or all of a refrigerating unit providing cold air.
- the inlets for this air are in the base of the cabinet, and the air is reduced to the necessary temperature, pumped through ducting up within the back of the cabinet, and allowed to spill outwards and forwards from vents at the back and at the top.
- the downward passage of the colde air encounters articles on the shelves so that the cold air is distributed in its passage over all of the shelves and down again to the base for recirculating.
- the design of the cabinet can be such that only a minimum of cold air escapes into the surrounding and so that the contents are held at a nominal temperature of for example 5°C with immediate access fo the customer.
- thermometer or thermometer either permanently or successively at different locations within the cabinet. For convenience, the locations of particular risk are usually chosen.
- the temperature of the thermometer is noted at intervals a a guide to the refrigeration condition of the cabinet and the quality of the contained foodstuffs.
- thermometers can become dislodged or broke especially if they are of the glass-bulb mercury or alcohol type.
- the retail staff must remember to take readings at frequent, and if possible regular, intervals and may in future, to comply with regulations need to preserve those readings in a uniform manner.
- a possible solution involving the use of an associated notebook kept in or near the cabinet would be accordingly liable to loss, damage or misuse.
- thermometer reading is in excess of an upper limit
- Conscientous staff may decide to withdraw from sale all of the material in the cabinet, with consequent loss, even though the high reading may be purely transient.
- the present invention sets out to provide equipment for monitoring temperature within an at least partially enclosed temperature-controlled container susceptible to temperature-influencing access to articles within th container.
- the invention consists in a temperature recording and monitoring device for articles located within a temperature-controlled enclosure and liable to individual retrieval from the enclosure, comprising a housing containing thermal performance components and temperature recording components; the surface and composition of the housing, and the mass and nature of the thermal performance components being such as to mimic the temperature changes in a typical one of said articles engendered by contacting air or absorbed radiation; and temperature recording component comprising means for retrieving at intervals data relative to temperature of the thermal performance components, means to store such data, and means to transmit such data during external interrogation.
- the temperature recording and monitoring device defined above is therefore particularly valuable for recording and monitoring temperatures within a vertical open-fronted chill-cabinet through which cold air is circulated from vents at the top.
- the housing of the device is typically of a straight sided box nature, which can comprise, for example, a suitably matt or coloured generally rigid synthetic polymer.
- the thermal performance components will tend to comprise a heat sink, eg in the form of a lump of metal, and surrounding thermally insulating layers such as a layer or layers of elastomeric foam.
- the box may be of a size generally to resemble the size of a tray of cooked chilled foodstuffs, for example chicken pieces, and should be of the same thermal performance under cabinet conditions.
- the temperature recording components are typically connected to the metallic heat sink of the thermal performance components, and are electrical in nature.
- the readings can be fed to a conventional electronic memory store, for occasional retrieval from outside of the housing. While this retrieval can be done by plugging in a lead to an external device, it is preferred within this form of the invention to provide a glazed window such that an interrogatable component beneath the window can both be actuated by and reflect an infra red beam from outside, thereby facilitating transfer without trailing wires to a suitable hand-held external unit.
- the space within the housing preferably further comprises electrical circuitry such as to provide, from the data, computation such as to record a coefficient derived from any excess temperature reading and the tim of excess, said computational circuit being connected t an alarm system, for example, an externally visible light alarm for actuation if a predetermined computational limit is exceeded.
- electrical circuitry such as to provide, from the data, computation such as to record a coefficient derived from any excess temperature reading and the tim of excess, said computational circuit being connected t an alarm system, for example, an externally visible light alarm for actuation if a predetermined computational limit is exceeded.
- the invention further extends to the combination of a plurality of devices as defined above with one or more interrogation devices which can be selectively utilized to retrieve data from each temperature recording and monitoring device.
- the invention further extends to a method of temperatur recording and monitoring for articles located within a temperature controlled enclosure, in which the device a defined above is placed from time to time at different positions within the enclosure and the accumulated data relevant to internal temperature of the device is retrieved at intervals utilising a suitable interrogation means.
- Figure 1 shows diagramatically a typical display cabinet for chilled cooked food, the cabinet including a temperature recording and monitoring device according to the invention.
- Figure 2 shows diagramatically the exterior of such a temperature recording and monitoring device.
- FIG. 3 shows diagramatically the essential features on the interior of the device of Figure 2.
- Figure 4 shows a hand-held data retrieving device to retrieve the information from the temperature recording and monitoring device as a permanent record.
- the cabinet 1 shown in Figure 1 is of conventional form. It comprises a base region 2, upstanding glazed vertical insulated walls 3, a succession of polymer coated or painted shelves 4 held between the walls 3, and an insulated top 5. Within the base is part or all of a standard refrigeration unit (not shown) , and extending upwardly within the back wall 6, is cold air ducting (also not shown) fed by the refrigeration unit. This ducting distributes chilled air to holes 7 at the back of the cabinet, from which the air flows forwardly and at least in part re-enters air inlet holes 8.
- the materials 9 stored on the shelves can be any of a wide range of cook-chill foodstuffs.
- a major proportio of these are based upon chicken portions cooked in various styles and chilled so that they merely need to re-heated, without loss of flavour as might occur in th case of deep-frozen foodstuffs.
- Pieces of cooked chicken are of fairly thick dimensions for foodstuffs and are susceptible to consumer fears of growth of bacteria. In many respects they represent the most taxing of materials to display on a cook-chill basis. They have therefore been used to define the parameters of the present invention.
- the present invention is based at least in part upon the realisation that a more accurate indication of received temperature on a pack of foodstuffs can be ascertained not merely by measuring the temperature of the contacting air but by measuring the whole body temperature of the foodstuffs. This temperature is a consequence of all of the heat absorbed by the foodstuffs under given conditions. Thus, as well as contact with the air, so that the foodstuff is chilled by convection or conduction, there is an appreciable element of absorbtion of energy from the surroundings.
- the lights in the stores, and in the cabinet itself, provide radiant energy and this is absorbed by the package 9 of foodstuff and converted to heat. This absorbtion is however dependent upon the temperature of the emitting source and also upon any reflected or absorbtive areas in the packaging, together with the internal composition of the package 9 and its behaviour under fluctuating absorbtion of energy.
- the temperature recording and monitoring device is accordingly configured typically as shown at Figures 2 and 3, rather than being a simple bulb (or electronic) thermometer sensor responsive only to the cold air.
- the external appearance of the temperature recorder and monitor is that of a straight sided box 10.
- the box 10 is made of more or less rigid synthetic polymer with a mat finish and a neutral greyish colour.
- the exterior of the box is provided with two small alarm lights 12, 13, and a glazed window 14.
- the box 10 is used by placing it from time to time in different places within the cabinet 1, especially in those places most subject to the risk of temperature fluctuation. Since, as described below, the lights are alarm lights the device is preferably placed with the lights 12, 13 facing forwards.
- Figure 3 shows diagramatically the essential features o the interior of the box 10.
- the essential thermal sink of the box is a cube or block of iron 15, perhaps 2 or 3cms in its length, wrapped in a layer of elastomeric foam 16 which is of the order of 1cm in thickness.
- This combination is located between the walls of the box 10 as a predominant heat absorbing structure with a close resemblance, in its heat absorbing and temperature change characteristics, to a typical cook-chilled meal of chicken pieces. The effect of this is therefore tha the temperature recording and monitoring device fluctuates in temperature within the cabinet in the same way as such a packaged foodstuffs having regard to the cold air temperature and the absorbtion of other energies from store lighting or cabinet lighting, etc.
- the device 10 shown clearly needs to have a volume and a surface typical for the stated temperature behaviour. This volume facilitates storage within the box of other components which, without affecting the temperature characteristics, are of considerable value in its operation.
- a battery 13 a temperature sensor 17 responsive to the temperature of the metal block 15 itself, means 18 for operating the sensor at intervals, and preferably at regular intervals; means 19 for recording the temperature thereby measured, in the form of a readable memory store; computational means 20 for taking a measure of excess temperature and a measure of elapsed time and deriving jointly from them a coefficient of acceptability of performance; circuitry whereby an excess value of said computation operates one of the lights 12 at the exterior of the casing; means responsive to a low output from the battery to operate the other of the alarm lights 13 and thereby indicate the need for battery change; and interrogatable output means 22 behind the glazed window 14 for said temperature values held in memory.
- the device samples temperature, (17, 18) and stores the sample value in a memory for as long as may be required. Additionally, i performs a computation (20) upon the sampled value, usually only if such volume is in excess of a predetermined upper temperature range. Transient excesses of temperature are acceptable but, if the excess temperature, and the time over which the excess persists, jointly multiply to a coefficient of performance acceptability outside a predetermined value then the alarm light is triggered.
- the device as shown could be taken out each evening and interrogated by management staff so as to give a daily record of the cabinet performance.
- it could be interrogated whenever required so that the information in the memory can be retrieved and for example converted to a print-out of numerical values of temperature or as a graphical representation of such temperature.
- Figure 4 shows a hand-held device which can be used for such interrogation. It is again in the form of a box 3 of synthetic polymeric material the most important feature of which is a glazed window which can be put adjacent to the glazed window 31 of the temperature recording device (or, if desired, left at some distance from that glazed window) and subject to an infra red beam generated from within the hand-held recorder.
- the infra red beam traverses the glazed windows 31, 14, actuates the interrogatable means 22, and by reflection carries the information within the memory of the temperature recording and monitoring device into a memory of the hand-held device 30.
- This information in the hand-held device can be used to operate a suitable numerical or graphical print-out 32 as and when desired.
- the frequency and regularity of measurement is not dependent upon the conscientiousness of staff; the decision to dump the contents of the cabinet is taken on a rational time-temperature coefficient rather than an ad hoc transient temperature figure; a permanent record as now required by regulation is provided; the record can be interrogated without physically touching the device or otherwise altering its activity; and the device is caused to operate upon the more accurate concept of "whole body" recording of temperature as distinct from the recording of the temperature in the contacting cooled air only.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB909018687A GB9018687D0 (en) | 1990-08-24 | 1990-08-24 | Improvement in temperature monitoring |
GB9018687.5 | 1990-08-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992003712A1 true WO1992003712A1 (en) | 1992-03-05 |
Family
ID=10681225
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1991/001441 WO1992003712A1 (en) | 1990-08-24 | 1991-08-27 | Improvement in temperature monitoring |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0544793A1 (en) |
CA (1) | CA2090336A1 (en) |
GB (1) | GB9018687D0 (en) |
WO (1) | WO1992003712A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2997497A1 (en) * | 2012-10-25 | 2014-05-02 | Univ Lorraine | Method for measuring temperature of part during e.g. annealing operation in thermal heat-treat oven, involves installing sensor in gauge to present thermal characteristics similar to portions of part, where gauge is installed in oven |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1079895A (en) * | 1964-07-13 | 1967-08-16 | Clark Equipment Co | Refrigeration warning system |
US3964313A (en) * | 1974-08-21 | 1976-06-22 | Swift & Company | Canned food recyclable thermal simulator |
DE3139663A1 (en) * | 1981-10-06 | 1983-04-21 | Bernhard 7551 Au Bauer | Device for measuring time and temperature |
-
1990
- 1990-08-24 GB GB909018687A patent/GB9018687D0/en active Pending
-
1991
- 1991-08-27 WO PCT/GB1991/001441 patent/WO1992003712A1/en not_active Application Discontinuation
- 1991-08-27 EP EP19910915857 patent/EP0544793A1/en not_active Withdrawn
- 1991-08-27 CA CA 2090336 patent/CA2090336A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1079895A (en) * | 1964-07-13 | 1967-08-16 | Clark Equipment Co | Refrigeration warning system |
US3964313A (en) * | 1974-08-21 | 1976-06-22 | Swift & Company | Canned food recyclable thermal simulator |
DE3139663A1 (en) * | 1981-10-06 | 1983-04-21 | Bernhard 7551 Au Bauer | Device for measuring time and temperature |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 13, no. 305 (M-849)13 July 1989 & JP,A,01 095 247 ( SHARP CORP ) 13 April 1989 see abstract * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2997497A1 (en) * | 2012-10-25 | 2014-05-02 | Univ Lorraine | Method for measuring temperature of part during e.g. annealing operation in thermal heat-treat oven, involves installing sensor in gauge to present thermal characteristics similar to portions of part, where gauge is installed in oven |
Also Published As
Publication number | Publication date |
---|---|
EP0544793A1 (en) | 1993-06-09 |
CA2090336A1 (en) | 1992-02-25 |
GB9018687D0 (en) | 1990-10-10 |
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