Correct Answer - Option 2 : Manometers
Semiconductor Thermometers (Semiconductor Temperature Sensors):
- They contain two similar diodes with temperature-sensitive voltage and current characteristics to measure the temperature changes effectively.
- Semiconductor temperature sensors are devices that come in the form of integrated circuits (IC).
- These are the electronic devices manufactured in an identical fashion to present-day electronic semiconductor devices like microprocessors.
- AD590 and the LM35 are examples of it.
Thermocouples:
- The thermocouple is an electrical device containing junctions of two dissimilar metal joints.
- It is used as a temperature sensor.
- It works on the principle of the Seebeck effect which states that the temperature difference between two dissimilar electric conductors produces a voltage difference between them.
- This potential difference is used to measure temperatures.
Radiation pyrometers:
- They are used to measure temperatures of red hot metals up to 3000°C.
- These concentrate thermal rays through an optical lens and focus them on to a thermoelement.
- The scale of the ammeter is calibrated in degrees Celsius or Kelvin.
Note: A Manometer is a device to measure pressures.
