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Thermocouple_contact

Information - Help 
ID = 77986
       
 
   
Tube type:  Thermocouple 
Identical to Thermocouple_contact

Base Wires
Was used by Technology / Measurement
Filament
Description

Small thermocouple, coupled with the heater, used to measure true rms value of an alternating current. The current flows in the heater, causing its temperature to rise proportionally to the rms value. The thermocouple generates an EMF proportional to the temperature reached by the heater.

The bulb is evacuated to prevent convection cooling of the heater by surrounding atmosphere.

Samples in the photos were made by American Thermo Electric, LA, Ca.

  • Heater 8 mA, 33 ohms, 264 mV
  • Couple resistance 10 ohms
  • EMF 6 mV at 8 mA heater
  • Thermocouple is not insulated from heater
 
Information source -- Collector info (Sammler)   
 
p9290023.jpg
Thermocouple_contact: Private collection
Emilio Ciardiello

 


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