Pyrometer- Handbook - Contika

thermocouples, for example, change physically at 1300
°C and then can no longer achieve repeatable readings.
For example, forging steel.
• Highly aggressive materials can be measured without
contact and thus without damage to the sensor. For
example, acids in chemical processes.
• Objects can be measured with pyrometers even though
they cannot be physically reached. Pyrometers are
compact units that can be installed nearly anywhere. All
they need is a clear line of sight to the object.
For example, measuring the temperature of metals
during the heating process.
• Objects conducting electricity may be measured without
danger of short-circuiting and without danger to the user.
For example, testing the temperature of electric terminals
in switch boxes.
• Heat is transferred very slowly and incompletely to the
sensor of a contact measuring instrument from poor heatconducting
objects, from low heat capacity objects and
from objects which have a small mass. This method
produces inaccuracies, but they can be eliminated by
using a non-contact device. For example, thin foils and
plastic film.
• Great distances are overcome by appropriate optics. For
example, flare stack monitors.
• It is possible to measure through windows so long as the
windowpane material is compatible 2). For example,
measuring temperatures in furnaces and in a vacuum.
2) see page 51
Pyrometer Handbook
aggressive materials
inaccessible objects
electricity conducting
objects
poor heat conductors
small mass, low heat
great distances
viewing windows
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