Temperature Measurement

Temperature is one of the seven fundamental units of measurement, unit of temperature is Kelvin(K).

We use two types of scale in measuring temperature that is –

1.Relative scales [Fahrenheit (°F) and Celsius (°C)]

2. Absolute scales [Rankine (°R) and Kelvin (K)].

The relation between the above two is described by following relations –

F = 1.8C + 32

C = (F-32)/1.8

R= F+ 460

K=C + 273

Methods/Instrument of Measuring Temperature

Basically, there are two types of sensor used in the measurement of temperature, contact type, and non-contact type.

Contact type sensor is –

  • Thermocouples

  • Liquid-in-glass thermometers

  • Resistance temperature detectors (RTDs)

  • Thermistors

  • Bimetallic strip thermometers

  • Pressure thermometers

In the case of non-contact-type sensors, the radiant power of the optical radiation received by the object or system is measured directly.

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Some non-contact-type sensors are –

  • Radiation Pyrometers

  • Optical Pyrometers

  • Fibre-Optic Thermometer

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