NL9101088A - Method and device for measuring in a short time the temperature of a substance whose temperature is roughly known - Google Patents
Method and device for measuring in a short time the temperature of a substance whose temperature is roughly known Download PDFInfo
- Publication number
- NL9101088A NL9101088A NL9101088A NL9101088A NL9101088A NL 9101088 A NL9101088 A NL 9101088A NL 9101088 A NL9101088 A NL 9101088A NL 9101088 A NL9101088 A NL 9101088A NL 9101088 A NL9101088 A NL 9101088A
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- NL
- Netherlands
- Prior art keywords
- temperature
- meter
- milk
- substance
- measurement
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01J—MANUFACTURE OF DAIRY PRODUCTS
- A01J7/00—Accessories for milking machines or devices
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01J—MANUFACTURE OF DAIRY PRODUCTS
- A01J5/00—Milking machines or devices
- A01J5/013—On-site detection of mastitis in milk
- A01J5/0138—On-site detection of mastitis in milk by using temperature
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- 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
- G01K1/16—Special arrangements for conducting heat from the object to the sensitive element
- G01K1/18—Special arrangements for conducting heat from the object to the sensitive element for reducing thermal inertia
Abstract
Description
Titel: Werkwijze en inrichting voor het in korte tijd meten van de temperatuur van een stof met ongeveer bekende temperatuur.Title: Method and device for measuring the temperature of a substance with approximately known temperature in a short time.
De uitvinding heeft betrekking op een werkwijze voor het in korte tijd meten van de temperatuur van een stof met ongeveer bekende temperatuur.The invention relates to a method for measuring the temperature of a substance with an approximately known temperature in a short time.
Bij een bekende in het Amerikaanse octrooischrift 4.593.649 beschreven inrichting en werkwijze, wordt de temperatuur van de melkstroom gemeten bij het melken van een koe. Dit gebeurt in de volle melkstroom.In a known device and method described in US patent 4,593,649, the temperature of the milk flow is measured when milking a cow. This happens in the full milk flow.
Bij een andere uit het Duitse Offenlegungsschrift 2.759.126 bekende werkwijze en inrichting wordt een melkstroom gedurende een bepaalde tijdsduur of op het moment van verschijnen van bloed of etter in de melk in een hulphouder geleid, waarna de melk, indien deze althans voor consumptie geschikt is, in een hoofdhouder wordt geleid. Genoemd via een hulphouder leiden vindt eigenlijk in wezen slechts gedurende de eerste 3-10 seconden plaats. Ook bestaat de mogelijkheid om de melk te controleren door de kleur daarvan te controleren.In another method and device known from German Offenlegungsschrift 2,759,126, a milk flow is guided into an auxiliary container for a certain period of time or at the time of the appearance of blood or pus in the milk, after which the milk, if at least suitable for consumption , is guided in a main holder. Said directing through an auxiliary holder actually only takes place during the first 3-10 seconds. It is also possible to check the milk by checking its color.
Gewezen wordt verder nog op de Nederlandse octrooiaanvrage 89.00479 waaruit een melkinstallatie bekend is waarbij de geleidbaarheid van de van een koe afkomstige melk wordt gemeten: op deze wijze wordt nagegaan of het betreffende kwartier van de uier waaruit de melk afkomstig is, ontstoken is. De uit een ontstoken kwartier afkomstige melk moet namelijk gescheiden worden gehouden van de overige melk daar de uit het ontstoken kwartier afkomstige melk niet meer geschikt is voor menselijke comsumptie, doch wel voor verwerking in bijvoorbeeld veevoer.Reference is also made to Dutch patent application 89.00479, from which a milking installation is known in which the conductivity of the milk from a cow is measured: in this way it is ascertained whether the relevant quarter of the udder from which the milk comes has been inflamed. Namely, the milk from the inflamed quarter must be kept separate from the other milk, since the milk from the inflamed quarter is no longer suitable for human consumption, but for processing in, for example, animal feed.
Nadelen van de hiervoor genoemde werkwijzen zijn diverse, namelijk:The disadvantages of the aforementioned methods are various, namely:
Ten eerste de temperatuurmeting is langzaam, omdat de aanvangstemperatuur van de temperatuurmeter de omgevingstemperatuur is en het relatief veel tijd kost om de tempera tuurmeter tot op de temperatuur van de te meten vloeistof op te warmen in casu tot de evenwichtssituatie is bereikt.Firstly, the temperature measurement is slow, because the initial temperature of the temperature meter is the ambient temperature and it takes a relatively long time to heat up the temperature meter to the temperature of the liquid to be measured, in this case until the equilibrium situation is reached.
Vooral bij automatisch melken is dit een nadeel, omdat de beschikbare melk- en meettijd aanzienlijk korter is. De koe laat zich soms vier maal per dag melken, waarbij de melktijd van 4 è 10 minuten teruggebracht wordt tot ca. 2 minuten of korter, terwijl ook de tijdige signalering van een afwijking van de melktemperatuur onnodig verlies van melk kan voorkomen.This is a disadvantage, especially with automatic milking, because the available milking and measuring time is considerably shorter. The cow can sometimes be milked four times a day, reducing the milking time from 4 to 10 minutes to about 2 minutes or less, while also timely signaling a deviation from the milk temperature can prevent unnecessary loss of milk.
Ten tweede de bekende methoden zijn onnauwkeurig, omdat de te meten vloeistof warmte-energie overdraagt op de temperatuurmeter en dus in temperatuur daalt, met als gevolg dat de gemeten eindtemperatuur lager ligt dan de echte vloeistof-temperatuur.Secondly, the known methods are inaccurate because the liquid to be measured transfers heat energy to the temperature meter and thus drops in temperature, with the result that the measured final temperature is lower than the real liquid temperature.
Ten derde kleine temperatuurverschillen kunnen niet worden gemeten, zodat deze meting ongeschikt is voor het meten van de vruchtbaarheid of "tochtigheid" van dieren.Third, small temperature differences cannot be measured, so this measurement is not suitable for measuring the fertility or "heat" of animals.
De uitvinding beoogt een werkwijze en inrichting te verschaffen waaraan genoemde nadelen niet kleven.The object of the invention is to provide a method and apparatus to which the above-mentioned drawbacks do not adhere.
Hiertoe vertoont de werkwijze van de in de aanhef genoemde soort het kenmerk, dat gebruik wordt gemaakt van een temperatuurmeter, die vóór gebruik op een bepaalde bekende temperatuur (T measurement start) wordt gehouden, welke in de nabijheid ligt van de genoemde ongeveer bekende temperatuur (T object).To this end, the method of the type mentioned in the preamble has the feature that a temperature meter is used, which is kept before use at a certain known temperature (T measurement start), which is in the vicinity of the said approximately known temperature ( T object).
Daarbij kan, ingeval de temperatuur van de te meten stof hoger is dan die van de omgeving, gebruik worden gemaakt van een temperatuurmeter die vóór gebruik een temperatuur heeft die in geringe mate lager ligt dan de genoemde ongeveer bekende temperatuur.In addition, if the temperature of the substance to be measured is higher than that of the environment, use can be made of a temperature meter which, before use, has a temperature which is slightly lower than the said approximately known temperature.
Ingeval de temperatuur van de te meten stof lager is dan de omgevingstemperatuur kan gebruik worden gemaakt van een temperatuurmeter met een temperatuur, die vóór gebruik in geringe mate hoger ligt dan de genoemde ongeveer bekende temperatuur.In case the temperature of the material to be measured is lower than the ambient temperature, use can be made of a temperature meter with a temperature which before use is slightly higher than the said approximately known temperature.
Verder verdient het aanbeveling om ingeval de temperatuur van de te meten vloeistof hoger is dan de omgevings temperatuur, de temperatuur van de meter iets lager in te stellen dan die van de te meten vloeistof, of andersom, omdat anders de temperatuurregeling van de meter energie gaat toe-of afvoeren en de toegevoerde warmte-, resp. koelenergie, het proces stoort en de verkeerde temperatuur wordt gemeten.Furthermore, it is recommended that if the temperature of the liquid to be measured is higher than the ambient temperature, the temperature of the meter should be set slightly lower than that of the liquid to be measured, or vice versa, because otherwise the temperature control of the meter is energy supply or return and the supplied heat and resp. cooling energy, the process interferes and the wrong temperature is measured.
In verdere uitwerking van de uitvinding, kan, wanneer de te meten stof een vloeistof is, bijvoorbeeld melk, het verkregen meetresultaat worden gebruikt voor het vaststellen van de vruchtbaarheid ("tochtigheid") van een dier. Een andere mogelijkheid bestaat daaruit, dat wanneer de stof een vloeistof is, bijvoorbeeld melk, de temperatuurmeting plaatsvindt in combinatie met een tweede meting, zoals een geleidbaarheidsmeting van de vloeistof.In further elaboration of the invention, when the substance to be measured is a liquid, for example milk, the resultant measurement result can be used for determining the fertility ("heat") of an animal. Another possibility consists in that if the substance is a liquid, for instance milk, the temperature measurement takes place in combination with a second measurement, such as a conductivity measurement of the liquid.
In verdere uitwerking van de uitvinding kan de temperatuur van alle in de beginfase van het melken uit een uier-kwartier afkomstige melk, in een door de hoofdstroom gevulde meetruimte worden gemeten. In deze meetruimte kan de temperatuur gemeten worden tijdens het doorstromen van de melk, echter ook bij onderbrekingen in de melkstroom, ontstaan doordat er weinig melk in het betreffende uierkwartier aanwezig is.In a further elaboration of the invention, the temperature of all milk originating from an udder quarter in the initial phase of milking can be measured in a measuring space filled by the main flow. In this measuring space, the temperature can be measured during the flow of milk, but also in the event of interruptions in the milk flow, caused by the fact that little milk is present in the relevant udder quarter.
Uit de verkregen meetinformatie kan een signaal worden gegenereerd, waarmee de van de norm afwijkende melk separaat wordt afgevoerd en opgeslagen.A signal can be generated from the measurement information obtained, with which the milk deviating from the standard is separately removed and stored.
De uitvinding heeft verder betrekking op een inrichting voor het uitvoeren van de beschreven werkwijze, welke inrichting daardoor wordt gekenmerkt, dat de temperatuurmeter bestaat uit een temperatuursensor opgenomen in een geïsoleerd opgestelde meetruimte in de hoofdstroom- of een by-pass stroom van de te meten vloeistof, van welke meetruimte de wanden door middel van een thermostatische regeling op de bekende temperatuur worden gehouden.The invention further relates to a device for carrying out the described method, which device is characterized in that the temperature meter consists of a temperature sensor included in an insulated measuring space in the main flow or a bypass flow of the liquid to be measured. the measuring space of which the walls are kept at the known temperature by means of a thermostatic control.
Daarbij is een uitvoeringsvorm mogelijk, waarbij de meetsensordraad - tijdens de perioden, waarin niet wordt gemeten - wordt gebruikt om de temperatuurmeter te verwarmen. Tevens is het van belang, dat de meetruimte inwendig aan de vloeistofstroom is aangepast met vloeiende bochten en afgeronde hoeken om te voorkomen, dat er plaatsen ontstaan, waar ongewenste bacteriegroei kan optreden.An embodiment is possible here, in which the measuring sensor wire - during the non-measuring periods - is used to heat the temperature gauge. It is also important that the measuring space is internally adapted to the liquid flow with smooth bends and rounded corners in order to avoid places where undesired bacterial growth can occur.
Ter verduidelijking van de uitvinding zal thans, onder verwijzing naar de tekening, een uitvoeringsvoorbeeld van de werkwijze en de inrichting voor het meten van de temperatuur van een kleine hoeveelheid van een stof worden beschreven. In de tekening toont: fig. 1 een grafiek waarbij langs de X-as de tijd is uitgezet en langs de Y-as de temperatuur en waarin het temperatuurverloop van de meter (onderste kromme) en van de te meten vloeistof (bovenste kromme) is weergegeven: fig. 1 toont hierbij de situatie uitgaande van een temperatuurmeter welke zich op de omgevingstemperatuur bevindt; fig. 2 toont een grafiek overeenkomstig fig. 1, doch waarbij de temperatuurmeter is "voorverwarmd" en wel tot nabij de temperatuur van de te meten stof.To clarify the invention, an exemplary embodiment of the method and apparatus for measuring the temperature of a small amount of a substance will now be described with reference to the drawing. In the drawing: Fig. 1 shows a graph in which the time is plotted along the X axis and the temperature along the Y axis and in which the temperature curve of the meter (bottom curve) and of the liquid to be measured (top curve) is Fig. 1 shows the situation starting from a temperature meter which is at the ambient temperature; Fig. 2 shows a graph corresponding to Fig. 1, but with the temperature meter being "preheated", close to the temperature of the substance to be measured.
Bij vergelijking van fig. 1 en 2 ziet men dat de tijd waarbinnen de temperatuur met de gewenste nauwkeurigheid kan worden vastgesteld aanzienlijk verschilt tussen een niet- en en wel-voorverwarmde temperatuurmeter.When comparing Figures 1 and 2, it can be seen that the time within which the temperature can be determined with the desired accuracy differs considerably between a preheated and non-preheated temperature meter.
Fig. 3 toont een uitvoeringsvoorbeeld van een temperatuurmeter te gebruiken bij het uitvoeren van de werkwijze volgens de uitvinding. De in het algemeen met 1 aangeduide temperatuurmeter is voorzien van een huis 2 met een aanvoer 3 en een afvoer 4. Rond het huis is een verwarmingselement 5 aangebracht, terwijl het geheel is afgedekt door een isolatiemantel 6. Ter plaatse van het huis 2 bevindt zich verder een thermosensor 7. De thermosensor 7 stuurt via verbindingskabel 8 een thermostatische regeling 9, die is aangesloten op een niet nader aangeduide energiebron. In het huis 2 reikt verder een sensor 10 waarvan de temperatuur verder wordt gemeten door een meter 11.Fig. 3 shows an exemplary embodiment of a temperature meter to be used in carrying out the method according to the invention. The temperature gauge, generally indicated by 1, is provided with a housing 2 with an inlet 3 and an outlet 4. A heating element 5 is arranged around the housing, while the whole is covered by an insulating jacket 6. At the location of the housing 2 furthermore a thermosensor 7. The thermosensor 7 controls, via connecting cable 8, a thermostatic control 9, which is connected to an unspecified energy source. A sensor 10 further extends into the housing 2, the temperature of which is further measured by a meter 11.
Fig. 4 tenslotte toont een soortgelijke inrichting als fig. 3 doch in de vorm van een doorstroommeter, voorzien van een huis 20, waarop aan weerszijden leidingen 21 en 22.Fig. 4 finally shows a similar device as fig. 3, but in the form of a flow meter, provided with a housing 20, on which pipes 21 and 22 on either side.
Elementhouder 23 omsluit een verwarmings- en meetelement 24, aangesloten via kabel 25 aan een niet weergegeven regelunit. Rond het huis 20 is een isolatiemantel 26 aangebracht.Element holder 23 encloses a heating and measuring element 24, connected via cable 25 to a control unit (not shown). An insulating jacket 26 is arranged around the housing 20.
De beschreven inrichting kan gemakkelijk worden ingebouwd in een afvoerleiding of een bypass leiding van een afvoersysteem. Het zal echter duidelijk zijn dat binnen het raam van de uitvindingsgedachte een groot aantal wijzigingen mogelijk is.The described device can easily be built into a drain pipe or a bypass pipe of a drain system. It will be clear, however, that a large number of changes are possible within the scope of the inventive idea.
Claims (13)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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NL9101088A NL9101088A (en) | 1991-06-24 | 1991-06-24 | Method and device for measuring in a short time the temperature of a substance whose temperature is roughly known |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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NL9101088 | 1991-06-24 | ||
NL9101088A NL9101088A (en) | 1991-06-24 | 1991-06-24 | Method and device for measuring in a short time the temperature of a substance whose temperature is roughly known |
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NL9101088A true NL9101088A (en) | 1993-01-18 |
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NL9101088A NL9101088A (en) | 1991-06-24 | 1991-06-24 | Method and device for measuring in a short time the temperature of a substance whose temperature is roughly known |
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1991
- 1991-06-24 NL NL9101088A patent/NL9101088A/en not_active Application Discontinuation
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