Factory Settings; Parameter Descriptions / Settings; Emissivity (Emi) = 100; Compensation Of Ambient Temperature (Ta) - LumaSense Technologies IMPAC IP 140-LO Betriebsanleitung

IMPAC pyrometer IP 140-LO
is supplied by the respective current. If this is not the case the selected analog input current span of the
indicator is not equivalent to the chosen current output span of the pyrometer and one of the current spans
or temperature range have to be modified. By pressing the „test" push button once again or by pressing any
push button of the LC-display the test current is switched off. Also after 30 seconds idle time the "test" cur-
rent is switched off. The unit will be in the measurement mode again.
8.5

Factory settings

Emissivity (Emi) = 100%;

Exposure time (t90) = min;
Clear time (tClear) = off;
Analog output (mA) = 0 ... 20 mA;
Sub range (from / to) same as temperature range
9

Parameter descriptions / settings

9.1 Emissivity (Emi)
For a correct measurement it is necessary to adjust the emissivity. This emissivity
is the relationship between the emission of an real object and the emission of a
black body radiation source (this is an object which absorbs all incoming rays and
has an emissivity of 100%) at the same temperature. Different materials have
different emissivities ranging between 0% and 100% (settings at the pyrometer
between 10 and 100%, the set value is indicated on the display). Additionally the
emissivity is depending on the surface condition of the material, the spectral
range of the pyrometer and the measuring temperature. The emissivity setting of
the pyrometer has to be adjusted accordingly. Typical emissivity values of various
common materials for the two spectral ranges of the instruments are listed below. The tolerance of the emis-
sivity values for each material is mainly dependent on the surface conditions. Rough surfaces have higher
emissivities.
Measuring object
"Black body furnace"
Extruded Aluminum
Brass
Brass oxidized (tarnished)
Copper
Copper, oxidized
Inconel
Inconel, oxidized
Oxidized Iron
Steel rolling scale
9.2

Compensation of ambient temperature (ta)

At the IP 140-LO the compensation of the ambient temperature has to be set always to
"auto", because it can be used only at low measuring temperatures (below 100°C). This
compensation is used for a very few special applications only. The standard setting of
this parameter is "auto", because the temperature of the air around the pyrometer is
normally the ambient temperature of the measured object. Should the measured object
be placed in an area with a higher wall temperature (e.g. inside a furnace), the measurement might be falsi-
fied (probably too high temperature indication). This influence can be compensated by presetting of the
ambient temperature of the object (presetting within the measuring range of the instrument).
It has to be considered, that this method only improves the results if the ambient temperature at
the place of the measured object is always constant and the emissivity is well known.
Emissivity [%]
(at 2.4 µm)
100
13
18
65 to 70
5
70 to 80
30
85
85 to 90
80 to 88
Address (Adr) = 00;
Baud rate (Baud) = 19200 Bd;
Temperature display (C / F) = °C
Wait time (tw) (for RS485) = 10;
Interface switch (RS485 / RS232) = RS232
Measuring object
Steel, molten
Nickel
Titanium, non-oxidized
Titanium, oxidized
Molybdenum
Molybdenum, oxidized
Black Carbon
Graphite
Stoneware, glazed
Porcelain rough
Display
of the
adjusted
emissivity
Emissivity [%]
(at 2.4 µm)
20 to 30
15 to 20
50
75 to 80
10
75 to 80
95
80 to 90
60
80 to 90
Settings:
auto
00°C (32°F)
. .
.
53°C (127°F)
15