Claims
- 1. In a photometer analysis system including means to transfer a reaction sample to a sample cell, apparatus for bringing the reaction sample to a predetermined temperature and maintaining its temperature constant in said cell comprising:
- (a) a metal block and cover of high thermal conductivity metal coacting to define a cavity, said cover and block being surrounded with thermal insulation;
- (b) a photometer sample cell of high thermal conductivity metal containing a sight passage;
- (c) thermal-insulation support means on said block mounting said sample cell in said cavity;
- (d) a heat exchange tube extending through said block and into said cavity;
- (e) conduit means of substantially lower thermal conductivity than said heat exchange tube interconnectng said sight passage with said heat exchange tube to thermally isolate the cell from said metal block; and
- (f) temperature regulation means for maintaining said block at a substantially constant predetermined temperature.
- 2. Apparatus according to claim 1 wherein said temperature regulation means comprises:
- (a) means to sense the temperature of said block;
- (b) a heat pump attached to said block to supply and remove heat to and from the block; and
- (c) control means having an input from said temperature sensing means and providing an output to control said heat pump.
- 3. Apparatus according to claim 2 wherein said thermal insulation means comprise a plastic V-block on which said sample cell rests.
- 4. Apparatus according to claim 3 wherein said sample cell is made of silver.
- 5. Apparatus according to claim 4 wherein said block and cover are made of aluminum.
- 6. Apparatus according to claim 1 wherein said heat exchange tube is made of stainless steel and said conduit means is a tube made of Tygon.
Parent Case Info
This application is a continuation of our copending application Ser. No. 499,853, filed Aug. 22, 1974 (now abandoned).
US Referenced Citations (7)
Continuations (1)
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Number |
Date |
Country |
Parent |
499853 |
Aug 1974 |
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