DE184455C - - Google Patents
Info
- Publication number
- DE184455C DE184455C DENDAT184455D DE184455DA DE184455C DE 184455 C DE184455 C DE 184455C DE NDAT184455 D DENDAT184455 D DE NDAT184455D DE 184455D A DE184455D A DE 184455DA DE 184455 C DE184455 C DE 184455C
- Authority
- DE
- Germany
- Prior art keywords
- temperature
- resistance
- thermocouples
- current
- galvanoscope
- 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.)
- Active
Links
- 230000000875 corresponding Effects 0.000 description 1
Classifications
-
- 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
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
Description
cfa\'ciuaink>.cfa \ 'ciuaink>.
i-Ti j μ η Γι n uii-Ti j μ η Γι n ui
KAISERLICHESIMPERIAL
PATENTAMT.PATENT OFFICE.
PATENTSCHRIFTPATENT LETTERING
KLASSE 42«. GRUPPECLASS 42 «. GROUP
Firma G. A. SCHULTZE und Dr. A. KOEPSEL in CHARLOTTENBURG.G. A. SCHULTZE and Dr. A. KOEPSEL in CHARLOTTENBURG.
Die Erfindung bezieht sich auf ein Verfahren zur Messung von Temperaturen mittels Thermoelementen und besteht darin, daß nicht nur die E. M. K. eines Thermoelementes, sondern noch die eines zweiten zur Hilfe genommen wird und aus dem Verhältnis der E. M. K. beider, derselben Temperatur ausgesetzten Thermoelemente die Temperatur bestimmt wird.The invention relates to a method for measuring temperatures by means of Thermocouples and consists in the fact that not only the E.M.K. of a thermocouple, but that of a second is taken to help and from the relationship of the E. M. K. both thermocouples exposed to the same temperature determine the temperature is determined.
ίο Das Verfahren hat den Vorzug, daß aus der Differenz von Ofen- und Zimmertemperatur entstehende Fehler verkleinert werden; sie können fast ganz zum Verschwinden gebracht werden, wenn man dafür sorgt, daß die E. M. K. beider Thermoelemente bei Zimmertemperaturen ungefähr gleich sind.ίο The method has the advantage that from the difference between the oven and room temperature resulting errors are reduced; they can be made to disappear almost entirely if you make sure that the E.M.K. of both thermocouples at Room temperatures are roughly the same.
Zum Auffinden des Verhältnisses der E. M. K. dient eines der bekannten Kompensationsverfahren, beispielsweise das in der Figur dargestellte. Tx sei _ ein Thermoelement mit der E. M. K. χ bei t° C, Ty ein solches mit der E. M. K. y bei t>° C. Tx sei mit einem großen Widerstand W in Reihe geschaltet. Die Widerstände der Thermoelemente, ebenso ihre Widerstandsänderungen bei Temperaturänderungen mögen gegen den Widerstand W vernachlässigt werden können.One of the known compensation methods, for example that shown in the figure, is used to find the ratio of the EMF. Let T x be a thermocouple with the EMF χ at t ° C, T y one with the EMF y at t> ° C. Let T x be connected in series with a large resistance W. The resistances of the thermocouples, as well as their changes in resistance with temperature changes, can be neglected compared to the resistance W.
Schaltet man nun das eine Ende von Ty If you now switch one end of T y
in richtigem Sinne an das eine Ende des Widerstandes W, das andere Ende an ein empfindliches Galvanoskop, dessen anderer Kontakt auf W schleift, in der aus der Figur ersichtlichen Weise, so wird man mit diesem Schleifkontakt, wenn x~> y, einen Punkt finden können, bei dessen Berührung der Strom im Galvanoskop verschwindet. Ist r der Widerstand zwischen den Enden von Ty, so ergeben die Kirchhoffsehen Gleichungen:in the right sense to one end of the resistor W, the other end to a sensitive galvanoscope, the other contact of which slides on W , in the manner shown in the figure, one will find a point with this sliding contact, if x ~> y the current in the galvanoscope disappears when touched. If r is the resistance between the ends of Ty, the Kirchhoff equations give:
Jx (W- r) + Jr = x,J x (W- r) + Jr = x,
Jr + Jy Jr + Jy g G = y,= y,
Jx -\~ Jy J x - \ ~ Jy JjYy
wenn Jx den ungeteilten Strom des Thermoelementes Tx, if J x is the undivided current of the thermocouple T x ,
Jy den ungeteilten Strom des Thermoelementes Ty, Jy is the undivided current of the thermocouple Ty,
J den Strom im Widerstände W— r, J is the current in the resistance W - r,
g den Galvanoskopwiderstand
bezeichnen. Wird Jy = o, d. h. fließt kein Strom durch das Galvanoskop, so ergibt
sich, da dann / = Jx wird: g the galvanoscope resistance
describe. If J y = o, i.e. no current flows through the galvanoscope, it follows that / = J x then:
Da nun zu jeder Temperatur ein ganz bestimmtes ¥- gehört, so läßt sich aus demSince there is a very definite ¥ - associated with every temperature, one can deduce from the
Verhältnis der beiden Widerstände diese Temperatur ohne weiteres bestimmen.The ratio of the two resistances can easily be used to determine this temperature.
Ein Beispiel möge dieses Verfahren noch deutlicher machen.Let an example make this procedure even clearer.
dann ist für W= 1000 Ohmthen for W = 1000 ohms
r = 500, 666, 750, 800, 833. r = 500, 666, 750, 800, 833.
Ist nun an dem Schleifkontakt bei W etwa eine Skala mit den zugehörigen, den Teilwiderständen entsprechenden Temperaturen angebracht, so kann man die zu dem gefundenenen Wert von r gehörige Temperatur sofort angeben.If a scale with the associated temperatures corresponding to the partial resistances is now attached to the sliding contact at W , then the temperature associated with the value of r found can be specified immediately.
Claims (1)
Publications (1)
Publication Number | Publication Date |
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DE184455C true DE184455C (en) |
Family
ID=448390
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DENDAT184455D Active DE184455C (en) |
Country Status (1)
Country | Link |
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DE (1) | DE184455C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2696118A (en) * | 1950-11-30 | 1954-12-07 | Honeywell Regulator Co | Temperature indicating device |
US2696120A (en) * | 1951-01-02 | 1954-12-07 | Honeywell Regulator Co | Temperature indicating apparatus |
-
0
- DE DENDAT184455D patent/DE184455C/de active Active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2696118A (en) * | 1950-11-30 | 1954-12-07 | Honeywell Regulator Co | Temperature indicating device |
US2696120A (en) * | 1951-01-02 | 1954-12-07 | Honeywell Regulator Co | Temperature indicating apparatus |
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