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3B Scientific™ Premium Heater for Franck-Hertz Experiment

Demonstrates quantization of energy released by free electrons in collisions with mercury.

Supplier:  3B Scientific™ U8482550115

Catalog No. S08133

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Also determines excitation energy of mercury resonance line (61S0 – 63P1), which is 4.9 eV
Highly evacuated electron tube containing mercury in a heating chamber
Heat electron tube in chamber to generate required mercury vapour pressure to achieve high probability of collisions between electrons and mercury atoms
Electron tube with plane parallel electrode system consists of an indirectly heated oxide cathode with aperture, grid and collecting electrode
Front plate printed with tube symbol
Electric heating chamber with continuous temperature control and digital temperature display shows actual and set-point temperatures
Lacquered metal housing has two observation windows, opening with spring clip for thermometer and thermally insulated carrying handle
Integrated microcontroller and Pt100 thermocouple for temperature measurement and control
Electrical Requirements: 115V, 50/60Hz


  • Heater voltage: 4 to 12V
  • Grid voltage: 0 to 70V
  • Suppressor voltage: 1.5V approx.
  • Tube dimensions: 130 x 26mm dia. approx.
  • Heater output: 400w
  • Temperature range: 160° to 240°C
  • Temperature constancy: ±1°C approx.
  • Overall dimensions: 335 x 180 x 165mm3 approx.
  • Weight: 5.6kg approx.



5.6 kg approx.
115 V


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