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Sample cell assembly having a heat conductive chamber surrounded by an electrothermal heating layer

  • US 3,869,215 A
  • Filed: 02/22/1974
  • Issued: 03/04/1975
  • Est. Priority Date: 02/22/1974
  • Status: Expired due to Term
First Claim
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1. Apparatus for containing and heating a liquid sample to a desired temperature for photometric analysis, comprising:

  • a cuvette having sample support walls at least the greater part of which are formed from a heat conductive material, an electrothermal conductor distributed around the heat conductive part of said sample support walls, said cuvette and conductor enabling the transmission of a radiation beam for photometric analysis through a sample contained within said cuvette, circulation means for moving a sample in closed circulatory movement between the interior wall surfaces and the inner portion of said cuvette, thereby distributing heat transmitted through the sample support walls from said electrothermal conductor throughout the sample, a temperature sensor mounted on the exterior surface of a sample support wall at a location sufficiently removed from said electrothermal conductor that the temperature of the support wall at the sensor is determined substantially by the temperature of a sample within the cuvette, means to apply an electrical energizing input to said electrothermal conductor, and means responsive to changes in the temperature sensed by said sensing means for dynamically controlling the said electrical input, thereby enabling the energization of said electrothermal conductor to be varied in positive proportion to the differential between the sample temperature and the devised analysis temperature.

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