IGA 320/23-LO Operating Manual Controls and Connections
18
The spot sizes, mentioned in the
table above, will only be
achieved at the measuring
distances of the corresponding
optics or with the focusable
optics at the adjusted distance.
Decreasing or increasing the
measuring distance enlarges the
spot size.
Spot sizes for intermediate distances that are not shown on the optical profiles may be
calculated using the adjoining formula.
Note: The InfraWin program includes a calculator (“IR calculator“) that roughly estimates
the unknown values.
Note: The pyrometer can measure objects at any distance, but it has to be at least as big as
the spot size of the pyrometer.
3.5.2 Adjusting the required measuring distance with optical head
or
, fixed adjusted
A tape can be used to determine the distance between the object and pyrometer. The
measuring distance is always measured from the front of the lens.
If the LED is switched on, its smallest spot is in the measuring distance of the corresponding
optics or adjusted distance and it marks the center of the spot.
3.5.3 Adjusting the required measuring distance with optical head
,
focusable
To adjust the correct measuring distance,
untighten the fixing nut and vary the length of
the optical head by turning the lens tube. When
correctly focused, the LED has its smallest spot size
(sharpest image). After adjustment, tighten the
D)DM(
a
a
M
1
1
−+=
D
D)
(M
a
a
M
2
2
+−=
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