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Operating manual
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22.2 Temperature measurement using spectral mode
For non-contact measurements the Ardoptix uses the intensity of the in-
frared radiation at one certain wavelength.
It is necessary to configure the Ardoptix to the respective emissivity coef-
ficient of the measuring object to get exact measuring results. An incor-
rectly set emissivity coefficient leads to wrong temperature readings.
In pyrometry, the specific radiation characteristics of the measured object
will influence the generated temperature data. In order to produce accu-
rate and reliable temperature readings, the pyrometer must be config-
ured according to the specific material constant (emissivity).
The annex includes a table showing emissivity coefficients for various
materials.
22.3 Temperature measurement using two-colour/ratio mode
The quotient channel of the Ardoptix measures the infrared radiation at
two wavelengths and calculates the ratio of these two radiation values.
This quotient (or this ratio) of the two intensities is proportional to the
temperature. The ratio remains constant even when the radiation intensi-
ties decrease, e.g. with vapour and dust in the field of view, fogged-up
lenses or changing surface properties (emissivity coefficient) of the
measured object. Therefore, with a homogeneous weakening of the sig-
nal, the two-colour pyrometer still provides a stable measuring signal.
If weakening of the radiation is not homogeneous or depending on the
wavelengths, the ratio of the two radiation intensities is not constant: the
emissivity ratio
changes. This emissivity ratio is the correction factor
that is set at the pyrometer and that needs to be adapted to the meas-
ured object when measuring with a two-colour pyrometer.
Resumé:
The two-colour measuring method offers great advantages due to its in-
sensivity to the described disturbances.
The applications cover large segments of the iron and steel producing
industry and the metal, cement and chemical industries.
Summary of Contents for Ardoptix PT 140 AF1
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