LumaSense IGA 15 plus, Operation Manual

IMPAC pyrometer IGA 15 plus

10 

6

Parameter description / adjustments 

6.1 

EMI (emissivity 

ε

) 

For a correct measurement it is necessary to adjust the emissivity. This 

emissivity

 is the relation-

ship 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 tempera-
ture. Different materials have different emissivities ranging between 0% and 100% (settings at the 
pyrometer between 10 and 100%). Additionally the emissivity is depending on the surface condi-
tion 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 spectral range of the IGA 15 

plus

 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 

EMI (1.45...1.8 µm)

Measuring object 

EMI (1.45...1.8 µm) 

„Black body furnace“ 

100% 

Zinc 

45 to 55% 

Steel heavily scaled 

85 to 90% 

Nickel 

15 to 20% 

Steel rolling skin 

80 to 88% 

Gold, Silver, bright 

2% 

Steel, molten 

20 to 25% 

Porcelain glazed   

60% 

Slag 

80 to 85% 

Porcelain rough 

80 to 90% 

Aluminum, bright 

10% 

Graphite 

80 to 90% 

Chromium, bright 

25 to 30% 

Fireclay 

45 to 60% 

Brass oxidized 

60 to 70% 

Stoneware, glazed 

80 to 90% 

Bronze, bright 

3% 

Brick 

80 to 90% 

Copper, oxidized 

70 to 85% 

Soot 

95% 

6.2 

MAX (maximum value) 

The MAX function shows the highest reading taken during a measurement.  
This feature is particularly useful for applications with fluctuating object temperatures or for the 
measurement of moving objects which are not constantly in the measuring beam of the pyrometer. 
With every new measurement the maximum value storage is cleared automatically, i.e. pushing 
the trigger again. 
 

Note:  

The response time of the pyrometer and with that the maximum value 
storage function is faster than the update of the display. 

6.3 

MIN (minimum value) 

The MIN function shows the lowest reading taken during a measurement. 

Note:  

The response time of the pyrometer and with that the minimum value 
storage function is faster than the update of the display. 

6.4 

AVG (average function) 

The average function always shows the average of the readings of the last 4 seconds.