DE2010288C3 - Circuit arrangement for monitoring the functionality of a temperature sensor - Google Patents
Circuit arrangement for monitoring the functionality of a temperature sensorInfo
- Publication number
- DE2010288C3 DE2010288C3 DE19702010288 DE2010288A DE2010288C3 DE 2010288 C3 DE2010288 C3 DE 2010288C3 DE 19702010288 DE19702010288 DE 19702010288 DE 2010288 A DE2010288 A DE 2010288A DE 2010288 C3 DE2010288 C3 DE 2010288C3
- Authority
- DE
- Germany
- Prior art keywords
- sensor
- circuit arrangement
- functionality
- transistor
- output
- 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
Links
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
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Temperature (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Description
Der Temperaturmeßfühler 1 ist zusammen mit den Widerständen 2, 3,4 und 5 in eine Brücke geschaltet,The temperature sensor 1 is connected in a bridge together with the resistors 2, 3, 4 and 5,
Die Erfindung betrifft eine Schaltungsanordnung as wobei das Potentiometer 4 zum Einstellen des SoIlzur Überwachung der Funklionsfähigkeil eines Tem- wertes dient. Vom Regelkreis ist noch der Differenzperaturmeßfühlers durch einen mit dem Fühler ver- verstärker 6 dargestellt.The invention relates to a circuit arrangement as wherein the potentiometer 4 for setting the solenoid Monitoring of the functional wedge of a temperature is used. The differential temperature sensor is still from the control circuit represented by an amplifier 6 with the sensor.
bundenen Differenzverstärker, der bei Über- bzw. Un- Mit der Beschallung 7 bis 16 dient der Differenz-tied differential amplifier, which is used in the event of over- or un- With the sound system 7 to 16
terschreiten von Grenzwerten der Eingangsspannung verstärker 17 zur Überwachung der Funktionsfähigein
Signal an seinem Ausgang abgibt. 30 keit des Temperaturfühlers 1. Tritt an dem Tempera-Temperaturmeßfühlern
kommt bei Heizvorgängen lurfUhler 1 ein Defekt auf, so gibt durch das damit eine wichtige Rolle zu. Ihr Ausfall soll nach Müg- verursachte Über- bzw. Unterschreiten von Grenzlichkeit
vermieden werden, damit keine Schaden an werten der Eingangsspannung, die mit den Spandem
Gerät oder auch an dem zu behandelnden War- nungsteilern 11, 12 und 13 eingestellt werden, der
megut infolge der Unkontrollierbarkeit von Tempe- 35 Differenzverstärker 17 am Ausgang ein Signal ab.
raturänderungen auftreten können. Durch das Ausgangssignal wird ein Transistor 18
Die am häufigsten auftretenden Fehler bei Tempe- über die Spannungsteilerwiderstände 19 und 20
raturmessungen mit Heiß- oder Kaltleitern und mit "durchgesteuert, so daß das Relais 21 anzieht. Das
Widerstandsthermometern sind Unterbrechung, z.B. mit Kontakt a„ in Selbsthaltung gehende Relais 21
durch Drahtbruch und Kurzschluß; d.h. Betriebszu- 40 schallet gleichzeitig über Kontakt α, den defekten
stände, die weit von den normal vorkommenden ent- Temperaturfühler 1 ab und den Reservefühler 22 an.
fernt sind. Bei einem funktionstüchtigen Reservefühler 22 Zur Feststellung dieser eventuell auftretenden verschwindet das Signal am Ausgang des Differenz-Fehler
ist eine Überwachung der Meßfühler nötig. Verstärkers 17. Sollte der Reservefühler 22 jedoch
In einfacher Weise wurde dazu bisher ein Diffe- 45 ebenfalls einen Defekt aufweisen, so steuert dann
renzverstärker derart mit dem zu überwachenden auch ein Transistor 23 durch, dessen Ausgangssignal
Temperaturmeßfühler verbunden, daß der Differenz- zum Abschalten des Gerätes verwendet werden kann,
verstärker bei Über- bzw. Unterschreiten von Grenz- Die Diode 24 schützt die Basis-Emitter Diode des
werten der Eingangsspannung, die durch einen Feh- Transistors 23 in Sperrichtung. Die Diode 25 funler
am Meßfühler hervorgerufen wurden, an seinem 50 gierl als Freilaufdiode für das Relais 21. If limit values are exceeded, the input voltage amplifier 17 emits a signal at its output for monitoring the functionality. 30 speed of the temperature sensor 1. If a defect occurs in the temperature sensor during heating processes, the lurfUhler 1 plays an important role. Their failure should be avoided according to Müg- caused exceeding or falling below the limit, so that no damage to the values of the input voltage, which are set with the Spandem device or also on the warning dividers 11, 12 and 13 to be treated, as a result the uncontrollability of temperature 35 differential amplifier 17 at the output from a signal.
temperature changes can occur. A transistor 18 is controlled by the output signal, so that the relay 21 picks up. The resistance thermometers are interrupted, for example with contact a " in." Latching relays 21 due to wire breakage and short circuit; ie operating 40 simultaneously sounded via contact α, the defective states, which are far from the normally occurring temperature sensor 1 and the reserve sensor 22 This possibly occurring disappears the signal at the output of the differential error, monitoring of the measuring sensor is necessary also monitor a transistor 23, whose output signal Te temperature sensor connected that the differential can be used to switch off the device, amplifier when exceeding or falling below limit The diode 24 protects the base-emitter diode of the value of the input voltage, which is caused by a faulty transistor 23 in the reverse direction. The diode 25 funler on the sensor was caused, on its 50 gierl as a free-wheeling diode for the relay 21.
Hierzu 1 Blatt Zeichnungen 1 sheet of drawings
Claims (1)
gnal an seinem Ausgang abgibt, dadurch ge- Erfindungsgemäß erfolgt dies dadurch, daß demCircuit arrangement for monitoring the chung of temperature sensors in such a way as to improve the functionality of a temperature sensor 5 that in the event of a defect in a sensor due to a differential connected to the sensor automatically switched to a reserve sensor, which is switched over or undercut and that this in turn is also monitored for its limit values of the input voltage an Si functionality,
gnal emits at its output, thereby according to the invention this takes place in that the
seine Ausgangsspannung zur Abschaltung der Durch die Schaltungsanordnung gemäß der Erfin-indicates that the differential amplifier io differential amplifier is followed by two transistors, two transistors are connected downstream of them, the first of which, when the signal occurs, energizes a self-locking relay when the signal occurs, and thus the relay that goes into locking (21) is excited and thus switches on the reserve sensor and the second transistor switches on the reserve sensor (22) and connects the two in such a way that a further signal connects this transiting transistor (23) in such a way that another 15 makes it conductive and its output voltage becomes the signal makes the transistor (23) conductive and disconnection of the circuit arrangement is ready,
its output voltage for switching off the By the circuit arrangement according to the invention
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19702010288 DE2010288C3 (en) | 1970-03-05 | 1970-03-05 | Circuit arrangement for monitoring the functionality of a temperature sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19702010288 DE2010288C3 (en) | 1970-03-05 | 1970-03-05 | Circuit arrangement for monitoring the functionality of a temperature sensor |
Publications (3)
Publication Number | Publication Date |
---|---|
DE2010288A1 DE2010288A1 (en) | 1971-09-23 |
DE2010288B2 DE2010288B2 (en) | 1973-06-07 |
DE2010288C3 true DE2010288C3 (en) | 1974-01-03 |
Family
ID=5764109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19702010288 Expired DE2010288C3 (en) | 1970-03-05 | 1970-03-05 | Circuit arrangement for monitoring the functionality of a temperature sensor |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2010288C3 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5856006A (en) * | 1981-09-29 | 1983-04-02 | Sharp Corp | Fault detecting method for temperature regulator |
-
1970
- 1970-03-05 DE DE19702010288 patent/DE2010288C3/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2010288B2 (en) | 1973-06-07 |
DE2010288A1 (en) | 1971-09-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C3 | Grant after two publication steps (3rd publication) | ||
E77 | Valid patent as to the heymanns-index 1977 | ||
EGA | New person/name/address of the applicant | ||
EF | Willingness to grant licences | ||
8339 | Ceased/non-payment of the annual fee |