Siemens Ardoptix PT 140 AF1, Operating Manual, Page: 19 / 68

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Operating manual
11
9.4 Displayed temperature readings configuration layer C020
10 Setting the Emissivity Ratio (two-colour/ratio mode)
When the radiation properties of the target object’s surface (emissivity)
differ at two different wavelengths, or when interferences in the field of
view
—such as dust or steam—do not weaken the signal to the same de-
gree at each wavelength, the pyrometer can be adjusted by setting the
ratio of these two emissivity coefficients.

During normal operating mode, the emissivity ratio can
be set at the pyrometer using the
▲▼
buttons. When
simultaneously pressing the MODE key, the display
shows the current measuring temperature while the
emissivity ratio coefficient continues to be adjusted in the
background. This is an easy way to determine the emis-
sivity ratio when the object temperature is known. The
modified values are directly adopted.