Baltech TL-0208C Manuale operativo - Pagina 14

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DEVICE APPLICATION

3.3.4 Emissivity of a controlled object

Most of organic matters and painted or oxidized surfaces

have the emissivity 0,95 (predefined in the device). But

when measuring

the temperature of shiny or polished

metal surfaces, you can have inaccurate measurement

results. To remove this error, set up the emissivity of a

controlled object in the device (see the table below and

setting description in the paragraph 3.3.2) , or stick a dark

scotch tape (friction tape) on the measured surface or coat it

with black mat paint. Carry out measurement of the

modified surface, when this material has the same

temperature, as the controlled object has (in several

minutes).

If the object surface allows no painting or black tape, you

can measure the temperature, using a contact thermometer

and pyrometer, after which calculate emissivity as the ratio

of pyrometer readings to contact thermometer readings.

The emissivity of the most common materials is specified in

the table.