Configuring The Pyrometer / Pyrometer Parameters; Soot Factor; Emissivity Slope (Only When Using The Pyrometer As A Usual Ratio Pyrometer); Emissivity Ε (Only When Using As A Usual Single-Channel Pyrometer) - Sensor Therm METIS M3F1 User Manual

6

Configuring the Pyrometer / Pyrometer Parameters

The instrument is ex works ready to use with the factory settings. For further adaptions to the measure-
ment task and to configure the inputs and outputs the connection to a PC is required, all settings can be
made via the included software SensorTools (see 7, SensorTools Software).
Further it is possible to communicate via interface commands directly to the pyrometer (see 11, Inter-
face Commands). The commands can be used for writing an own control or can be entered via a ter-
minal software.
6.1

Soot Factor

The M3F1 measures the radiation by glowing soot and fuel particles of hot, CO
different characteristics of the radiating soot particles can be taken into account by entering a soot fac-
tor. About software or interface command are input from 0.50-2.50 possible (equivalent to 50-250% in
0.1% increments).
6.2

Emissivity Slope (only when using the pyrometer as a usual ratio pyrometer)

When using the pyrometer as a ratio pyrometer, possibly the emissivity slope must be considered, ac-
cording to the material to be measured.
Measuring objects that emit the same on the two wavelengths of a 2-color pyrometer are often referred
to as "Gray bodies" (e.g. well oxidized iron or steel surfaces). They can be measured accurately with the
setting 1.00 for the emissivity slope without correction.
Measuring objects whose emissivity is different on the two wavelengths of the pyrometer (e.g. shiny un-
oxidized metal surfaces) need for accurate temperature measurement a correction setting, the so-called
emissivity slope Ɛ
channel 1 or 2 is higher (gain from 1.000 to 0.800, attenuation from 1.000 to 1.200).
Regardless of emissivity slope 1 or above or below is
used to measure, the ratio must remain constant in the
required temperature range. In the software Sensor-
Tools the 2-color temperature and those of the two
channels can be displayed at the same time. A 2-color
measurement is possible if the curves of the two chan-
nels in the required measuring range run uniformly par-
allel, so the ratio is constant. If the temperature values of
the curves are identical (at the same emissivity setting),
then the emissivity slope is 1. Do they run parallel, so
the correct value for the emissivity ratio must be found,
such by comparative measurement with a thermocouple
and subsequent ratio setting until the temperatures match.
Emissivity ε (only when using as a usual single-channel pyrometer)
6.3
The pyrometer also can be used in single-channel mode, the measurement corresponds to that of a
conventional radiation pyrometer. In this measuring mode the input of an emissivity is necessary.
The emissivity indicates the radiation capacity of an object to be measured relative to a calibration
source with the same temperature. To obtain correct readings, the emissivity must be taken into ac-
count in the measurement and adapted for the respective measuring material on the pyrometer. Each
material has a max. emissivity of 1.00 which can be set, an adjustment of up to 1.20 can be used. The
emissivity adjustment above 1.00 allows for temperature corrections due to higher background reflec-
tion.
In principle applies: to measure metals in a short-wavelength spectral range as possible, as here the
emissivity is higher than in the long-wave range.
14
Configuring the Pyrometer / Pyrometer Parameters
/ Ɛ
. The value can be larger or less than 1, depending on whether the emissivity of
2 1
METIS M3F1
containing flames. The
2