FIELD: metallurgical industry; power engineering; chemical industry. SUBSTANCE: temperature gauge has sensing element in the shape of anode and control electrode positioned in vacuum. It also has power supply unit and information display circuit. Sensing element is provided additionally with cathode made as cup. Its bottom has emission coating which faces cavity of body. Cup bottom is made spherical with radius in center which coincides with center of anode made as sphere. Control electrode is immovable. It is provided with sensitivity control unit. The latter is connected electrically to cathode, control electrode and to anode through power supply unit and information display circuit. Sensitivity control unit is made in the form of two variable resistors. First variable resistor is connected to cathode and power supply unit, and second resistor is connected in parallel to power supply source. EFFECT: higher measurement results. 2 cl, 4 dwg
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