Radiator Temperature Indicator

This radiator
temperature indicator can be designed using electronic circuit diagram
below. Temperature indicator consists of two special zener diode, D1 and
D2, connected in series to ensure accuracy of 5.96 V Zener voltage at
25 ° C. As long as the radiator temperature does not exceed 50 ° C,
thermal indicator will flash a green LED, one orange will be provided for temperatures of 50 … 75 ° C and a red LED, for temperatures above 75 ° C.

Zener voltage will increase by 20 mV for each temperature increase
of a degree Celsius temperature. Radiator temperature corresponding
voltage level is compared with two reference voltages, IC1 and IC2
using. When the temperature reaches 50 ° C, IC2’s output goes to logic
state “1” so that T3 leads and following ignition with diode D4. At 75 °
C, IC1’s output is in logic state “1” and, therefore, T2 and T3 will,
so that D3 and D4 lights are off.

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