Heat Sensor Circuit And Working Operation

A 230v ac supply is provided to the load in this case the load is represented with a lamp.

Heat sensor circuit and working operation.

The main property of a heat sensor is to sense the heat which is present around the sensor. The light sensor circuit is an electronic circuit designed using light sensor ldr darlington pair relay diode and resistors which are connected as shown in the light sensor circuit diagram. You also note that before start testing the circuit first set the variable resistor. Working of the circuit is simple when there is heat or increase in temperature to the level where it crosses the threshold set by pot then the collector current increase and led starts illuminating slowly.

The principle of operation of heat detector circuit. First is the positively controlled type of circuit. If the o 2 sensor heater circuit s negative wire goes directly to ground look for a short to power problem. When the set value of the temperature is high then it is indicated with the help of a glowing led.

We can also use buzzer in place to led. Remove the relay and retest the circuit. Usually the heater circuit in this case is controlled by a relay. The o 2 sensor s heater circuit is controlled in one of two ways.

In this heat detector circuit diagram a potential divider circuit is formed with a series connection of thermistor and 100 ohms resistance. Light sensor circuit working operation.