Test Function; Factory Settings; Parameter Descriptions / Settings; Emissivity (Emi) = 100 - LumaSense Technologies IP 140 Betriebsanleitung

IMPAC pyrometer IP 140
8.4

Test function

The diagnostic push button „test" generates a current on
the analog output which is used to check if a connected
external indicator shows the correct temperature value.
The test current output is centered to the chosen analog
output span, consequently 10 mA is supplied if the analog
output is adjusted to 0 to 20 mA and 12 mA is supplied if
the analog output span is set from 4 to 20 mA. The LC
display indicates the respective current along with the
corresponding temperature. For example if a measuring
range of 75°C to 550 °C is selected the temperature
shown in the display is 312.5°C). This temperature must
be reflected exactly by the indicator which 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" current 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
blackbody radiation source (this is an object which absorbs all incoming rays and
has an emissivity of 100%) at the same temperature. Different materials have dif-
ferent emissivities ranging between 0% and 100% (settings at the pyrometer be-
tween 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 py-
rometer 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 emissivity 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)

The compensation of the ambient temperature can be used 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
14
Emissivity [%]
(at 2.4 µm)
100
13
18
65 to 70
5
70 to 80
30
85
85 to 90
80 to 88
Test function active
(here the analog output
is set to 0 -20 mA)
Display which also has
to be on an external
indication instrument
(here temp. range
75 to 550°C)
Address (Adr) = 00
Baud rate (Baud) = 19200 Bd
Temperature display (C / F) = °C
Wait time (tw) (for RS485) = 10
Interface (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