GB2235780A - A Temperature monitoring apparatus - Google Patents
A Temperature monitoring apparatus Download PDFInfo
- Publication number
- GB2235780A GB2235780A GB9017395A GB9017395A GB2235780A GB 2235780 A GB2235780 A GB 2235780A GB 9017395 A GB9017395 A GB 9017395A GB 9017395 A GB9017395 A GB 9017395A GB 2235780 A GB2235780 A GB 2235780A
- Authority
- GB
- United Kingdom
- Prior art keywords
- temperature
- monitoring apparatus
- display
- product
- record
- 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.)
- Withdrawn
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
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/16—Sensors measuring the temperature of products
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/42—Circuits effecting compensation of thermal inertia; Circuits for predicting the stationary value of a temperature
- G01K2007/422—Dummy objects used for estimating temperature of real objects
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
Abstract
A temperature monitoring apparatus for monitoring the product temperature of food stuffs comprises a simulator 1, with such insulation 2 so as to be a temperature mid-way between deep temperature and surface temperature of a specific foodstuff (e.g. a chicken), a temperature sensing means 3 and a display means 4. The temperature sensing means is inserted into the simulator which comprises a methyl-cellulose compound 1' in paste form in a spill-proof container 5. The temperature sensed by the temperature sensing means 3 is displayed via a display means 4, said display means portraying and recording both historic and/or current temperature conditions lying outwith pre-selected limits. The apparatus also includes an alarm to indicate that a high or low temperature condition exists or has existed. <IMAGE>
Description
'*Temperature Monitoring Apparatus" This invention relates to temperature monitoring apparatus, especially but not exclusively for monitoring the temperature of items retained, stored, or displayed in refrigerated cabinets or hot cabinets.
Conventionally, the temperature of modulated environments has been accessed by sensing air temperature, for example around items of food stored in a display cabinet. The sensors of such systems register the rapid changes in cabinet temperature that can be brought about by, for example, a customer breaking the insulating air curtain during selection of a food item; on registering increase or decrease in temperature, the system activates the chilling or heating means in order that the temperature is corrected to within pre-determined limits.
However, such systems do not register the temperature of the product stored in the refrigerator, display cabinet or the like. There is increasing public concern, in particular regarding the degradation of biological material and consumables, especially for human consumption, and thus there is increasing demand and need for means to monitor the temperature of the product, and to inform the retailer, customers and the like of any possible harmful condition.
Hitherto, product temperature has been measured by invasive means (e.g. food probes) which damage the item selected for sampling; since such sampling (to be statistically viable) frequently requires more than one item to be sampled, there is considerable wastage of product. Furthermore, if the probe is removable and sampling (and thus monitoring) is only periodic, significant temperature changes may go unrecorded. If a probe remains permanently in an item, there is a likelihood that the probe, together with the item, will be removed intentionally or unwittingly by a customer.
According to a first aspect of the present invention there is provided temperature monitoring apparatus for monitoring the temperature of a product, the apparatus comprising a simulator, simulating the product, temperature sensing means to sense the temperature of the simulator, and means to record and display a temperature change outwith a pre-selected temperature range.
Preferably, the apparatus includes an alarm, whereby the recording of a temperature change outwith the pre-selected range is apparent.
Preferably, the simulator comprises material whose characteristics under temperature change are similar to a specific product over a specific temperature range.
Preferably, the simulator comprises a methyl-cellulose compound and an insulating medium therearound; most preferably, the methyl-cellulose compound is in paste form in a plastic spill-proof container having a thermopocket therein for the temperature sensing means.
The temperature sensing means may be a temperature sensor in the form of a PRT, PRC, or thermistor.
The display means such as an LCD (liquid crystal display) preferably permits display of current temperature and any historic temperature that lay outwith the pre-selected range; still more preferable, the apparatus is provided with record means to record temperature against time and means to permit authorised users to access the record of the record means.
The means to permit authorised access to the record or to display information may comprise recessed push-buttons, a first button being for current temperature display and a second being for display of current or historic low or high temperature outwith the range and the time that such low/high temperature was maintained.
There may be microprocessing means included so as to allow the simulator characteristics to be modified so as to be in accordance with deep or surface product temperature, or so as to permit a catalogue of products, the product from the catalogue being selected via a third recessed push-button.
According to the present invention there is provided a simulator for a food product, which simulator's characteristics to temperature change are similar to the product over a specific temperature range, the simulator comprising a methyl-cellulose or like compound with insulating medium therearound.
Although water most closely follows a food product temperature decrease, the latent heat phase in cooling makes water alone unsuitable. The substance, i.e.
methyl-cellulose, must be non-toxic, robust and non-leaking.
Preferably, the depth of methyl-cellulose and thickness of the insulating medium is variable to simulate different products. Chicken, for example, may be selected, as the public associates fowl with food poisoning problems and chicken is conventionally one of the most difficult food items to keep at an optimum temperature.
According to the second aspect of invention there is provided temperature monitoring apparatus for monitoring the temperature of a product, the apparatus comprising temperature sensing means to sense the temperature of the environs of the product, and means to correct the temperature value sensed in accordance with product type, and means to record and display a change in corrected temperature outwith a pre-selected temperature range for the product type.
Preferably, the correcting means and the record and display means are associated with, or comprise, micro-processing means, with liquid crystal display (LCD) as the display means.
Preferably, the temperature readings sensed by the sensing means are fed into the correcting means which is a mathematical model in the form of a algorithmic mathematical thermo-model, the model being adjustable for a range of product types, e.g. dairy, meat, vegetables.
As the product characteristics in different environmental temperatures and ranges are known (in order to calculate the algorithms) only the environs (e.g. display case air temperature, casing temperature) need be measured for accurate prediction of product temperature; invasive means are not required. The product characteristics for the algorithms may be calculated by a series of preliminary investigations using actual product or using the simulator of the first aspect of the present invention.
Preferably, the apparatus includes an alarm, whereby the recording of a temperature outwith the pre-selected range is apparent.
The temperature sensing means may be a temperature sensor in the form of a PRT, PRC, or thermistor.
The display means such as an LCD preferably permits display of current temperature and any historic temperature that lay outwith the pre-selected range; still more preferable, the apparatus is provided with record means to record temperature against time and means to permit authorised users to access the record of the record means.
The means to permit authorised access to the record or to display information may comprise recessed push-buttons, a first button being for current temperature display and a second being for. display of current or historic low or high temperature outwith the range and the time that such low/high temperature was maintained.
The recording and/or display means of both the first and the second aspects of the present invention may comprise remote data-logging and display apparatus, which may only be accessible by authorised personnel.
The provision of remote data-logging permits the continuous monitoring of a number of display cases, all having product therein.
The apparatus of both the first and second aspects may be powered by battery or mains and the display means may be integral with the simulator and temperature sensing means, or remote therefrom, and/or a data-logging device is attachable to the simulator by a jack-plug and lead.
Remote read-out of the information may be achieved by a transmitter and receiver, in the form of a radio pager, to alert personnel.
Embodiments of the present invention will now be described, by way of example, with reference to the accompanying figures and table, in which:
Fig. 1 is a side elevational view of
temperature monitoring apparatus
according to the present invention;
Fig. 2 is a front elevational view of
the apparatus of Fig. 1;
Fig. 3 is a sectional view of the
apparatus of Fig. 2 on line X-X'; and
Table I is a schedule of the range of
display read-out and push-button
operations of the apparatus of Figs.
1 to 3.
Referring to the figures, there is shown temperature monitoring apparatus for monitoring the product temperature of foodstuffs kept in refrigerated display cabinets.
The illustrated apparatus is particularly suitable for the monitoring of the temperature of foodstuffs in the form of chickens or chicken pieces. The apparatus comprises a simulator, shown generally at 1, of a depth and with such insulation 2 so as to be a temperature mid-way between deep temperature and surface temperature of a chicken.
The apparatus also includes temperature sensing means, shown generally at 3, and display means, shown generally at 4, to display any temperature change which lies outwith pre-selected limits of a temperature range.
The simulator 1 comprises a methyl-cellulose compound 1' in paste form in a spill-proof container 5, having insulating medium 2 therearound and having a thermopocket 6 therein for insertion of the temperature sensing means 3 in the form of a PRT or PRC or thermistor 6', the junction between the thermistor 6' and its associated leads being a thermal seal 7.
The simulator 1, thermistor 6 and display means 4 are integral parts of a single unit having an outer metallic casing 8, insulating feet 9, and an apertured front facia panel 10, the apertures being in the form of a window 12 for a LCD 11 (liquid crystal display) attached to a circuit board 13 parallel to and rearwards of the front facia panel 10, and windows 14,15 for recessed push-buttons 14',15' being respectively a button 14' for display on the LCD 11 of current temperature, and a button 15' for display cf historic (or current) temperature conditions lying outwith the pre-selected limits, and more specifically the temperature in degrees centigrade and number of hours for which the low or high temperature was maintained.
The push-buttons 14',15' are recessed to prevent unauthorised access, the recesses 14,15 necessitating the insertion of a tool, such as a pen or pencil, to permit operation.
The electronic components and circuitry comprise the temperature sensing means 3, a sensor analogue amplifier circuit, an analogue to digital circuit and
LCD, alarm threshold latch circuits, elapsed alarm time and time counter circuits, and various logic circuits related to display formats and push-button operation.
The apparatus includes an alarm to indicate that a high or low temperature condition exists or has existed, the alarm being the display of respectively a plus (+) or minus (-) sign on the LCD.
The various display formats, being both alarm signals and information recorded or monitored by the unit, are shown in Table I, together with the push-button operations required and an explanation of the temperature condition that each display format indicates.
The illustrated unit is battery 16 operated and this allows for "retro-fit" in existing display cabinets,
Other (not shown) embodiments may run from mains power.
These and other embodiments (also not shown) may have remote display means, being data-logging devices with display in the form of electronic read-outs or paper read-outs, and preferably with a facility to record changes in temperature against time.
The apparatus can also be used in hot cabinets, refrigerators and in other environments where knowledge of the temperature of an item therein is important and/or required. For consumables it is imperative that retailers know when food, be it hot or chilled, falls outwith a safe temperature range and for how long. The illustrated embodiment permits a display on the LCD 11 of up to 9 hours only of unacceptable temperature conditions. As any retailer would be removing the food from display if the food had been outwith the temperature range for even this length of time, a record of the length of longer periods would not be required in these circumstances.
The operational features of the shown apparatus are as follows:1. The LCD has a resolution of l/lOth of a degree centigrade and a maximum temperature range of -100C to +600C; (if the display means 4 is remote and connected to the simulator 1, etc., by jackplug and lead, the temperature range is -99.90C to +99.90C).
2. Accuracy of +0.50C.
3. All display formats as shown on Table I, with built in hours counter to display up to 9 hours, all being only accessible to authorised or trained individuals.
4. Shelf-standing unit requiring no additional power supply.
5. The methyl-cellulose does not freeze until a specified sub-zero temperature has been achieved, so that the simulator will continue to fall in temperature, whereas the actual product alongside would pass through a freezing curve (as most food items have a large percentage of their weight as water); this allows the low temperature alarm threshold to be achieved in the simulator in time to save the actual product from freezing (which may, for example, damage nutrients therein or the taste thereof).
Alternative simulators can be made to be representative of different products and the important relationships (to ensure the correct temperature retention) are between: - 1) simulator product substance (e.g. methyl-cellulose paste); 2) simulator product volume; 3) plastic enclosure, both dimension and shape; 4) thickness of surrounding insulating medium; and 5) material of surrounding insulating medium.
Methyl-cellulose has been found to be preferable as simulator product substance especially for food in low temperature environments, as it is non-toxic and without a shelf-life restriction. Alternatives include water with glycerol, particularly if it is for a short shelf-life simulator.
The illustrated embodiment is particularly suitable for use in refrigerated display cabinets or hot food cabinets. Other embodiments are provided with, for example, a handle to be readily portable and permit temperature monitoring, from initial food processing to retaii display, including use in non-modulated environments, such as loading bays.
In other (not illustrated) embodiments, the apparatus is provided with a microchip and microprocessing means; it is possible therewith to select surface or deep temperature monitoring, and/or to select simulation of different products, the menu of products being displayed on the LCD by means of a third push-button recessed mid-way between the existing two push-button apertures.
In still other (not illustrated) embodiments, the apparatus comprises temperature sensing means to sense the environs (e.g. display cabinet internal air temperature) and means to correct the temperature value sensed, the correction being in accordance with product type. The means for the correcting includes micro-processing means using an algorithmic mathematical thermo-model calibrated for various different products and for those different products over particular environmental temperature ranges such that the temperature sensed is corrected by a factor(s) to generate a value indicative of deep or surface temperature of the product dependent not only on current display case air temperature but also historic display case air temperature. The apparatus also includes means to record and display a change in corrected temperature value if it goes outwith (i.e.
above or below) a pre-determined temperature range for product type.
Claims (15)
1 A temperature monitoring apparatus for monitoring the temperature of a product, said apparatus comprising a simulator, temperature sensing means adapted to sense the temperature of the simulator, and means to record and display said temperature.
2 A temperature monitoring apparatus as claimed in
Claim 1, wherein the simulator comprises material whose characteristics under temperature change are similar to a specific product over a specific temperature change.
3 A temperature monitoring apparatus as claimed in
Claim 1 or 2, wherein the simulator comprises a methyl-cellulose compound and an insulating medium therearound.
4 A temperature monitoring apparatus as claimed in
Claim 3, wherein the methyl-cellulose compound is in paste form.
5 A temperature monitoring apparatus as claimed in any one of the preceding Claims, wherein the apparatus includes micro-processing means adapted to allow the simulated characteristics to be modified in accordance with deep or surface product temperatures, or so as to permit a catalogue of products, and means to select a product from the catalogue.
6 A temperature monitoring apparatus for monitoring the temperature of a product, comprising temperature sensing means to sense the temperature of the environs of the product, and means to correct the temperature value sensed in accordance with product type, and means to record and display a change in corrected temperature outwith a pre-selected temperature range for the product type.
7 A temperature monitoring apparatus as claimed in
Claim 6, wherein the means to correct the temperature values sensed in accordance with product type, is associated with, or comprises, micro-processing means.
8 A temperature monitoring apparatus as claimed in
Claim 6 or Claim 7, wherein the temperature sensed by the sensing means is fed into the correcting means, and wherein the correcting means is a mathematical model in the form of an algorithmic mathematical thermo-model, the model being adjustable for a range of product types.
9 A temperature monitoring apparatus as claimed in any of the preceding claims, wherein said apparatus includes an alarm, whereby the recording of a temperature outwith a pre-selected range is apparent.
10 A temperature monitoring apparatus as claimed in any one of the preceding Claims, wherein the temperature sensing means is a temperature sensitive resistor.
11 A temperature monitoring apparatus as claimed in any one of the preceding Claims, wherein the means to record and display the temperature records and displays a current temperature and any historic temperature that lay outwith a pre-selected range.
12 A temperature monitoring apparatus as claimed in any one of the preceding Claims, wherein the means to record the temperature is adapted to record temperature against time.
13 A temperature monitoring apparatus as claimed in any one of the preceding Claims, wherein the means to record and display the temperature includes a transmitter and receiver whereby the temperature may be known at a remote location.
14 A temperature monitoring apparatus as claimed in any one of the preceding Claims, wherein the means to record and display the temperature includes means to permit only authorised users to access the recorded information and display.
15 A temperature monitoring apparatus as claimed in Claim 14, wherein the means to permit authorised users to access the recorded information and display comprises recessed push-buttons, a first button being for current temperature display and a second button being for display of current or historic low or high temperatures outwith the range, and the time that such low or high temperatures were maintained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9017395A GB2235780A (en) | 1989-09-05 | 1990-08-08 | A Temperature monitoring apparatus |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB898920030A GB8920030D0 (en) | 1989-09-05 | 1989-09-05 | Temperature monitoring apparatus |
| GB898926049A GB8926049D0 (en) | 1989-11-17 | 1989-11-17 | Temperature monitoring apparatus |
| GB9017395A GB2235780A (en) | 1989-09-05 | 1990-08-08 | A Temperature monitoring apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9017395D0 GB9017395D0 (en) | 1990-09-19 |
| GB2235780A true GB2235780A (en) | 1991-03-13 |
Family
ID=27264672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9017395A Withdrawn GB2235780A (en) | 1989-09-05 | 1990-08-08 | A Temperature monitoring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2235780A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2356454A (en) * | 1999-11-16 | 2001-05-23 | Universal Master Products Ltd | Internally-mounted thermal sensor for monitoring food |
| EP1152315A3 (en) * | 2000-05-03 | 2005-02-09 | Computer Process Controls, Inc. | Wireless method and apparatus for monitoring and controlling food temperature |
| GB2405477A (en) * | 2003-09-01 | 2005-03-02 | Radio Tech Ltd | Temperature measuring apparatus for sensing ambient temperature |
| GB2465019A (en) * | 2008-11-06 | 2010-05-12 | Universal Master Products Ltd | Food simulant material for temperature control sensor |
| WO2013012546A1 (en) * | 2011-07-18 | 2013-01-24 | Lettuce Box, Llc | Temperature mimic probe for food products |
| FR3019276A1 (en) * | 2014-03-31 | 2015-10-02 | Metrosite | METHOD AND DEVICE FOR TRACKING THE DERIVATIVE IN TEMPERATURE OF THERMOSTATIC OR CLIMATIC SPEAKERS |
| EP3717879A4 (en) * | 2017-11-27 | 2021-08-25 | Supercool Asia Pacific Pty Ltd | HEAT ACTION PROBE AND PROCEDURE |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4184340A (en) * | 1977-11-03 | 1980-01-22 | Whirlpool Corporation | Temperature sensor mounting means |
| GB2164449A (en) * | 1984-08-23 | 1986-03-19 | Johnson Matthey Plc | Monitoring temperature induced deterioration of stored articles |
-
1990
- 1990-08-08 GB GB9017395A patent/GB2235780A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4184340A (en) * | 1977-11-03 | 1980-01-22 | Whirlpool Corporation | Temperature sensor mounting means |
| GB2164449A (en) * | 1984-08-23 | 1986-03-19 | Johnson Matthey Plc | Monitoring temperature induced deterioration of stored articles |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2356454B (en) * | 1999-11-16 | 2004-03-17 | Universal Master Products Ltd | Method and apparatus for controlling refrigeration apparatus |
| AU781471B2 (en) * | 1999-11-16 | 2005-05-26 | Universal Master Products Limited | Method and apparatus for controlling refrigeration |
| US6976368B1 (en) | 1999-11-16 | 2005-12-20 | Universal Master Products Limited | Method and apparatus for controlling refrigeration |
| GB2356454A (en) * | 1999-11-16 | 2001-05-23 | Universal Master Products Ltd | Internally-mounted thermal sensor for monitoring food |
| EP2287700A3 (en) * | 2000-05-03 | 2012-09-05 | Computer Process Controls, Inc. | Wireless method and apparatus for monitoring and controlling food temperature |
| EP1152315A3 (en) * | 2000-05-03 | 2005-02-09 | Computer Process Controls, Inc. | Wireless method and apparatus for monitoring and controlling food temperature |
| US7013661B2 (en) | 2000-05-03 | 2006-03-21 | Computer Process Controls, Inc. | Wireless method for monitoring and controlling food temperature |
| US7150156B2 (en) | 2000-05-03 | 2006-12-19 | Computer Process Controls, Inc. | Product simulating probe and method |
| EP2287699A3 (en) * | 2000-05-03 | 2012-09-05 | Computer Process Controls, Inc. | Wireless method and apparatus for monitoring and controlling food temperature |
| GB2405477A (en) * | 2003-09-01 | 2005-03-02 | Radio Tech Ltd | Temperature measuring apparatus for sensing ambient temperature |
| GB2405477B (en) * | 2003-09-01 | 2006-10-18 | Radio Tech Ltd | Temperature measuring apparatus and method therefor |
| WO2010052501A3 (en) * | 2008-11-06 | 2010-08-26 | Universal Master Products Limited | Food simulant material for temperature control sensor |
| GB2465019A (en) * | 2008-11-06 | 2010-05-12 | Universal Master Products Ltd | Food simulant material for temperature control sensor |
| GB2465019B (en) * | 2008-11-06 | 2015-08-12 | Universal Master Products Ltd | Food simulant material for temperature control sensor |
| WO2013012546A1 (en) * | 2011-07-18 | 2013-01-24 | Lettuce Box, Llc | Temperature mimic probe for food products |
| CN103620359A (en) * | 2011-07-18 | 2014-03-05 | 莴苣箱有限责任公司 | Temperature mimic probe for food products |
| EP2734821A4 (en) * | 2011-07-18 | 2015-01-28 | Lettuce Box Llc | Temperature mimic probe for food products |
| US9518943B2 (en) | 2011-07-18 | 2016-12-13 | Lettuce Box, Llc | Temperature mimic probe for food products |
| FR3019276A1 (en) * | 2014-03-31 | 2015-10-02 | Metrosite | METHOD AND DEVICE FOR TRACKING THE DERIVATIVE IN TEMPERATURE OF THERMOSTATIC OR CLIMATIC SPEAKERS |
| EP3717879A4 (en) * | 2017-11-27 | 2021-08-25 | Supercool Asia Pacific Pty Ltd | HEAT ACTION PROBE AND PROCEDURE |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9017395D0 (en) | 1990-09-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |