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Microbridge Rejustor™ Design Challenge Official Entry |
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Title: |
Precision OpAmp Heater Circuit using a Platinum Thermocouple with Rejustors. |
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Abstract: |
There are requirements in Medical Diagnostic units that require the temperature of certain reagents to be maintained within 0.1 deg C in order to meet stated accuracies of that device. Normally a precision platinum thermocouple is used that has a value of 100 ohms at 0 Deg C. The thermocouple located inside a heater block. The fluid of interest is held in the heater block until it comes up to temperature. A platinum thermocouple's rise in resistance with temperature is very linear within its operating range. Normally a differential amplifier is used with one input coming from the thermocouple and the other input is referenced to a precision resistor. |
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Submitted By: |
gschooley |
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Submitted On: |
12/31/2007 |
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Total Views: |
676 |
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