Thermocouple apparatus

Claim 1

A THERMOCOUPLE TEMPERATURE INDICATION AND HIGH LIMIT TEMPERATURE SENSING APPARATUS, COMPRISING; A THERMOCOUPLE HAVING A REFERENCE JUNCTION BEING ADAPTED ING JUNCTION, SAID SENSING JUNCTIN BEING ADAPTED TO BE SUBJECTED TO A VARIABLE TEMPERATURE CONDITION, SAID THERMOCOUPLE HAVING AN OUTPUT WHICH IS A VOLTAGE RISE WHEN SAID SENSING JUNCTION IS AT A TEMPERATURE ABOVE THE TEMPERATURE OF SAID REFERENCE JUNCTION, A BRIDGE CIRCUIT INCLUDING A SOURCE OF D.C. VOLTAGE HAVING A FIRST OUTPUT WHICH IS A VOLTAGE RISE OF A FIXED MAGNITUDE, AND HAVING A SECOND OUTPUT WHICH IS A VOLTAGE DROP OF A VARIABLE MAGNITUDE, SAID VARIABLE MAGNITUDE BEING INDICATIVE OF THE HIGH LIMIT TEMPERATURE TO BE SENSED, CYCLICALLY OPERABLE SWITCH MEANS, TEMPERATURE INDICATION AMPLIFIER MEANS HAVING AN INPUT AND OUTPUT, MEANS CONNECTING SAID SWITCH MEANS TO THE INPUT AND OUTPUT OF SAID TEMPERATURE INDICATION AMPLIFIER MEANS, MEANS CONNECTING SAID THERMOCOUPLE IN SERIES WITH THE FIRST OUTPUT OF SAID BRIDGE CIRCUIT TO THE INPUT OF SAID TEMPERATURE INDICATION AMPLIFIER MEANS, TEMPERATURE INDICATION MEANS, MEANS CONNECTING SAID TEMPERATURE INDICATION MEANS TO THE OUTPUT OF SAID TEMPERATURE INDICATION AMPLIFIER MEANS, HIGH LIMIT AMPLIFIER MEANS HAVING AN INPUT AND AN OUTPUT, MEANS CONNECTING SAID SWITCH MEANS TO THE INPUT AND OUTPUT OF SAID HIGH LIMIT AMPLIFIER MEANS, MEANS CONNECTING SAID THERMOCOUPLE IN SERIES WITH THE SECOND OUTPUT OF SAID BRIDGE CIRCUIT TO THE INPUT OF SAID LIMIT AMPLIFIER MEANS TO CAUSE THE OUTPUT THEREOF TO CONSIST OF CYCLIC VOLTAGE DROP SIGNALS WHEN THE TEMPERATURE OF SAID SENSING JUNCTION IS BELOW THE HIGH LIMIT AND TO CONSIST OF CYCLIC VOLTAGE RISE SIGNALS WHEN THE TEMPERATURE OF SAID SENSING JUNCTION IS ABOVE THE HIGH LIMIT, MONOSTABLE TRIGGER MEANS HAVING AN INPUT AND AN OUTPUT AND CONSTRUCTED AND ARRANGED TO HAVE A STABLE CONDITION OF OPERATION AND TO BE SENSITIVE ONLY TO A VOLTAGE DROP INPUT SIGNAL TO SWITCH TO AN UNSTABLE CONDITION OF OPERATION, MEANS CONNECTING THE INPUT OF SAID TRIGGER MEANS TO THE OUTPUT OF SAID HIGH LIMIT AMPLIFIER MEANS, AND MEANS CONNECTED TO THE OUTPUT OF SAID TRIGGER MEANS AND CONSTRUCTED AND ARRANGED TO BE RESPONSIVE ONLY BY CYCLING OF SAID TRIGGER MEANS BETWEEN SAID STABLE AND SAID UNSTABLE CONDITIONS OF OPERATION.