Temperature Controller Assembly.
Electronic Function (Figure 3-7).
The temperature controller assembly and target source assembly
provide a control temperature differential between target source and
ambient temperature.
Temperature differential (4.5 degrees C) is
maintained by sensing the target source ambient temperatures and then
regulating the current through a heater.
Input power of 115 VAC and 0.5 ampere is applied through circuit
breaker CB1. Transformer T1 steps the voltage down to 24 VAC. The
24 VAC is fullwave rectified by the temperature comparator to produce
24 VDC, causing the POWER ON indicator DS2 to illuminate.
Temperature sensor A2A1 monitors the temperature of the target, and
temperature sensor A2A2 monitors the ambient temperature.
The
voltage differential of the sensors is applied to the temperature
comparator A1A1, which supplies heater current to A2R1.
The
temperature comparator provides heater A2A1 current as required to
maintain a 4.5 degree C temperature differential.
Figure 3-7.
Electronic Function.
57
MM4812
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