IMPAC pyrometers IS 210 · IGA 210
9
7
Parameter Settings
The setting of emissivity, response time and temperature
sub range can
only
be done via service interface with the
portable setup device HT 6000 (see
adapter for IN 210 and the software InfraWin (see
).
On request the instrument also can be delivered with
presetting on demand.
7.1
Factory settings
Emissivity
= 100%;
response time
= 250 ms;
sub range
= measuring range;
clear time
= Off;
ambient
temperature
compensation
= auto;
address
= 00
7.2
Emissivity
ε
The
emissivity
is the relationship between the emission of a 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 5 to 100%). Materials
which reflect more radiation have a lower emissivity and the emissivity setting of the pyrometer
needs to be adjusted accordingly. Additionally the emissivity is depending on the surface
condition of the material, the spectral range of the pyrometer and the measuring temperature.
Typical emissivity values of various common materials for the two spectral ranges of the in-
struments are listed in the emissivity table below. The tolerance of the emissivity values for
each material is mainly dependent on the surface conditions. Rough surfaces have higher
emissivities.
Emissivity
ε
Emissivity
ε
Measuring
object
IS 210
(at 0.9 µm)
IGA 210
(at 1.6 µm)
Measuring
object
IS 210
(at 0.9 µm)
IGA 210
(at 1.6 µm)
Blackbody source
1
1
Zinc
0.58
0.45 - 0.55
Steel heavily scaled
0.93
0.85 - 0.9
Nickel
0.22
0.15 - 0.2
Steel rolling skin
0.88
0.8 - 0.88
Gold, Silver, bright
0.02
0.02
Steel, molten
0.3
0.2 - 0.25
Porcelain glazed
0.6
0.6
Slag
0.85
0.8 - 0.85
Porcelain rough
0.8 - 0.9
0.8 - 0.9
Aluminum, bright
0.15
0.1
Graphite
0.8 - 0.92
0.8 - 0.9
Chromium, bright 0.28 - 0.32
0.25 - 0.3
Chamotte
0.45 - 0.6
0.45 - 0.6
Brass oxidized
0.65 - 0.75
0.6 - 0.7
Earthenware, glazed 0.86 - 0.9
0.8 - 0.9
Bronze, blank
0.03
0.03
Brick
0.85 - 0.9
0.8 - 0.9
Copper, oxidized
0.88
0.7 - 0.85
Soot
0.95
0.95
7.3
Response time t
90
The response time is the time interval between the instant of an abrupt
change in the value of the measuring temperature and the instant from
which the measured value of the pyrometer remains within specified limits.
The time is taken to reach 90% of the recorded temperature difference.
Longer response times can be used for the measurement of objects which
have rapidly fluctuating temperatures to achieve a constant temperature reading.
Service
interface
Sealing
cap
Settings:
20 ms
. . .
10 s
