Temperature sensing device
First Claim
1. AN EXPANDED UPPER RANGE THERMOCOUPLE THERMOMETER FOR MEASURING CURRENT VAVLUES INDICATIVE OF TEMPERATURE COMPRISING A THERMOCOUPLE, A THERMISTOR, AND A LOW-RESISTANCE GALVANOMETER HAVING AN ANGULARLY ROTATABLE MOVEMENT LINEARLY RESPONSIVE TO GALVANOMETER CURRENT CONNECTED SERIALLY IN A CLOSED CIRCUIT, AND MEANS FOR LOCATING BOTH THE THERMISTOR AND THE MEASURING JUNCTION OF THE THERMOCOUPLE IN THE TEMPERATURE ZONE TO BE MEASURED, SAID THERMISTOR HAVING A RESISTANCE VERY MANY TIMES HIGHER THAN THAT OF THE GALVANOMETER IN THE LOWER RANGE OF THE THERMOMETER TO PERMIT ONLY SMALL THERMOCOUPLE CURRENTS TO FLOW THROUGH THE GALVANOMETER WHEN THE ZONE TEMPERATURE IS IN SAID LOWER RANGE AND HAVING A RESISTANCE OF THE SAME ORDER OF MAGNITUDE OR SMALLER THAN THAT OF THE GALVANOMETER WHEN THE ZONE TEMPERATURE IN SAID UPPER RANGE TO THEREBY EXPAND THE TEMPERATURE SENSITIVITY OF THE THERMOMETER IN SAID UPPER RANGE.
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1 Claim
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1. AN EXPANDED UPPER RANGE THERMOCOUPLE THERMOMETER FOR MEASURING CURRENT VAVLUES INDICATIVE OF TEMPERATURE COMPRISING A THERMOCOUPLE, A THERMISTOR, AND A LOW-RESISTANCE GALVANOMETER HAVING AN ANGULARLY ROTATABLE MOVEMENT LINEARLY RESPONSIVE TO GALVANOMETER CURRENT CONNECTED SERIALLY IN A CLOSED CIRCUIT, AND MEANS FOR LOCATING BOTH THE THERMISTOR AND THE MEASURING JUNCTION OF THE THERMOCOUPLE IN THE TEMPERATURE ZONE TO BE MEASURED, SAID THERMISTOR HAVING A RESISTANCE VERY MANY TIMES HIGHER THAN THAT OF THE GALVANOMETER IN THE LOWER RANGE OF THE THERMOMETER TO PERMIT ONLY SMALL THERMOCOUPLE CURRENTS TO FLOW THROUGH THE GALVANOMETER WHEN THE ZONE TEMPERATURE IS IN SAID LOWER RANGE AND HAVING A RESISTANCE OF THE SAME ORDER OF MAGNITUDE OR SMALLER THAN THAT OF THE GALVANOMETER WHEN THE ZONE TEMPERATURE IN SAID UPPER RANGE TO THEREBY EXPAND THE TEMPERATURE SENSITIVITY OF THE THERMOMETER IN SAID UPPER RANGE.
Specification
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Current AssigneeGlenn A. Pettit
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Original AssigneeGlenn A. Pettit
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InventorsPettit, Glenn A.
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Application NumberUS04/128,428Time in Patent Office1,533 DaysField of SearchUS Class Current374/182CPC Class CodesG01K 7/021 Particular circuit arrangem...
