Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1984-10-01
1986-11-25
Bartis, A.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219296, 219306, 219308, 422 65, H05B 102, F24H 110, G01N 3502
Patent
active
046250964
ABSTRACT:
The temperature of a liquid bath in the tank of a clinical analyzer is precisely regulated to a known reaction temperature, for example, 37.0 degrees C., notwithstanding the transport of cuvettes through the tank by a conveyor for photometric analysis, by providing an electric heater assembly externally of the tank in a circulation loop through which the both liquid is circulated from a tank liquid outlet to a tank liquid inlet. The temperature of the liquid is measured by a first temperature sensor located downstream of the heater assembly but upstream of the tank inlet and a second temperature sensor located in the tank remote from the tank inlet. The deviation of the measured liquid inlet temperature from a preset liquid inlet temperature and the deviation of the measured tank temperature from the desired constant tank temperature are used to obtain a heating element drive signal for controlling the energization of the heater assembly to maintain the bath temperature constant. The temperature sensors comprise thermistor probes, with the time constant of the second temperature sensor being about ten times that of the first temperature sensor.
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American Hospital Supply Corporation
Bartis A.
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