Lumasense-technologies IGA 320/23 Manuel d'utilisateur télécharger pdf (Page 9)

IMPAC pyrometer IGA 320/23

5 Optics

The pyrometers are equipped ex works with one of the following optics. These optics are focusing to a cer-

tain distance, i.e. in these distances each optics achieves its smallest spot size in relation to the measuring

distance. The spot size will change in any other distance (shorter or longer).

Note: Please notice that the measuring object must be as least as big as the spot size.

Optional a close-up lens is available for the pyrometer (only for optics 250). This optics is screwed in front of

the optics and provides a small spot size in the focus distance.

The following drawing and the table shows the size of the spots in mm in dependence of the measuring dis-

tance. Values between the mentioned data can be calculated by interpolation. The spot size for measuring

distance 0 is the aperture diameter “D” of the optics.

Optics MB

a : M *

)

a M a

without close-up lens 250 5 500 24 1000 62

with close-up lens 1 50 1 100 16 200 46

MB 5.5

with close-up lens 2

50 : 1

120 2.4 300 27 500 55

without close-up lens 250 2.5 500 19 1000 52

with close-up lens 1 50 0.5 100 15 200 44

MB 7

with close-up lens 2

100 : 1

120 1.2 300 24 500 50

without close-up lens 250 1.6 500 17.2 1000 48.4

with close-up lens 1 50 0.3 100 14.6 200 43.2

MB 12

with close-up lens 2

160 : 1

120 0.8 300 23 500 48

without close-up lens 250 1.25 500 12.5 1000 35

with close-up lens 1 50 0.25 100 10.5 200 31

250

MB 18

with close-up lens 2

200 : 1

120 0.6 300 16.5 500 34

MB 5.5 50 : 1 16 42.3 98.5

MB 7 100 : 1 8 27.3 68.5

MB 12 160 : 1 5 21.6 57.3

800

MB 18

without close-up lens

200 : 1

800

1500

16.3

3000

42.5 10

Using the close-up lens slightly attenuates the measuring signal (due to the transmittance). To get further-

more correct measuring results, the transmission of the close-up lens (90% for the IGA 320/23) must be

entered in the software InfraWin (see 6, Settings /

parameter descriptions). Alternatively the emissivity ε

can be adapted: ε

Trans

= 0.90 x ε

Object

The spot sizes, mentioned in the

table above, will be only achieved

at the adjusted distance. Decreas-

ing or increasing the measuring

distance enlarges the spot size.

Spot sizes for intermediate dis-

tances, which are not shown on

the optical profiles, may be calcu-

lated using the following formula:

Note:

The InfraWin program includes a Spot size calculator that roughly

estimates the unknown values.

ot size

[

]

Measuring distance

perture D

Ø M

D)DM(



DD)(M



1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 47 48

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Lumasense-technologies IGA 320/23 Manuel d'utilisateur Page 9

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