There are some important disadvantages of radiation pyrometer which are given below.
The radiation pyrometer is complex in nature.
It has non linear scale.
It has possible errors due to pressure to intervening gases or vapours that absorb radiation.
Emissivity of target material affecting measurement.
There are some important applications of radiation pyrometer which are given below.
The radiation pyrometer is used for temperature above the physical operating range of thermocouples.
It is used for measurement of temperature in exhaust, flues etc. in heating system.