Emissivity Measurement Apparatus

Emissivity Measurement Apparatus for Educational Laboratory.

Product Code:


Emissivity Measurement Apparatus

  • The present Set-up is designed to measure the emissivity of test plate. The test plate comprises of a mica heater sandwiched between two circular plates.
  • Black plate is identical with test plate, but its surface is blackened.
  • As all the physical properties, dimension and temperature are equal heat losses from both plates will be same except radiation loss.
  • Hence the input difference will be due to difference in emissivity.
  • Both plates are supported on individual brackets in a enclosure with one side glass to ensure steady atmospheric conditions.
  • Temperature Sensors are provided to measure the temperature of each plate and surrounding.
  • Electric Supply is given to heaters through separate variacs so that temperatures of both can be kept equal and is me asured with Digital Voltmeter and Digital Ammeter.


  • Determination of the Emissivity of a test plate.
  • Study the variation of emissivity of test plate with absolute temperature.

Utilities Required:

  • Electricity Supply : 1 Phase, 220 V AC, 4 Amp.
  • Table for set-up support.

Technical Specifications:

  • Test plate Diameter: 160 mm (approx.)
  • Black Plate Dia: 160 mm (Approx.)
  • Heater (2Nos.): Nichrome Wire Heater. (One each for test plate & black plate)
  • Digital Voltmeter: 0-300 Volt
  • Digital Ammeter: 0-2 Amps
  • DPDT Selector switches: For Digital Voltmeter & Digital Ammeter
  • Variacs; 0- 230 V, 2 Amp, (2 Nos.)(One each for test plate and black plate)
  • Digital Temp. Indicator: 0-3000C, with multi-channel Switch
  • Temperature Sensors: RTD PT-100 type
  • Instruction Manual: An english instruction manual will be provided along with the Apparatus