Piezo Electric Heat Sensor
- Product SKU: LGKT109
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Warehouse Details
Specification
Description
Here is an ultrasensitive heat sensor for monitoring high temperatures in electronic devices. A heat sink can be placed inside the electronic gadget that generates heat during operation. The ultrasensitive heat sensor circuit also functions as a sensitive Fire Alarm. This heat sensor uses the piezoelectric property to sense heat. When this happens, the output of CA3140 remains low. When the piezo disc is subjected to heat stress, it generates a very small current that is enough for upsetting the balance of the inputs of IC CA3140. This changes the output of IC CA3140 from low to high. This high output is used to activate the alarm circuit based on the ROM IC UM3561.
The Piezo Electric Heat Sensor element is the ordinary piezo disc found in the buzzer. The middle part of the piezo disc is coated with a layer of piezoelectric material. A high gain type OP-Amp is used to sense the electrical signals from the piezo disc. The inverting pin2 and non-inverting pin3 inputs of the Op-Amp IC CA3140 are shorted through the capacitor so that both the inputs will be in a balanced state.
Block Diagram
Physical Attributes
- Dimensions (cm) L x W x H : 20 x 15 x 5
- Weight (gm): 200
