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In biochemistry analyzer the temperature play crucialrole as many of the health parameters are tested at precise temperature. In automated bio -chemistry analyzer, precise temperature control is achieve d by using the peltier device as heat pump and PID control action. The temperature is measured at the flow cell using the LM-35 temperature sensor and set point temperature isset by using the PWM output of a microcontroller employed for the control action . In the presented work, the temperature control is achieved at an accuracy of ±0.1 0 C by controlling the design parameters of the heat pump circuit. Further, besides controlling the temperature at desired set point, the temperature achieving rate has to ma de as fast as possible. This is made by using an enhanced current source by suitable designing the peltier driving circuit.

Heat Pump Design Using Peltier Element for Temperature Control of the Flow Cell