LumaSense Technologies IS 12-S - Manual (Page 18)

IS 12 / IGA 12 Manual Controls and Instalaltion 18
center of the spot, not the exact size. The laser targeting light can be used without affecting the
measurement.
3.3 Optics
The pyrometers are equipped ex works with a fixed or a focusable optics. The smallest spot size
for the fixed optics is shown for the specified measuring distance. With the focusable optics,
the smallest possible spot size can always be adjusted for each distance within the optics limits.
The selection of a suitable fixed or focusable optics depends on different factors:
Very short measuring distances up to 250 mm to achieve extremely small spot sizes are
only available as fixed optics.
The rotary mirror attachment ROT 10 can only be used in combination with fixed optics.
The three focusable optics allow the exact adjustment of any required measuring
distance from 277 mm.
Focusable optics offer high flexibility to adapt the instrument to applications with
different measuring distances.
3.3.1 Fixed optics
IS 12; IS 12-S: MB 14 MB 16; 18; 20L MB 25; 35L
IGA 12; IGA 12-S: MB 10 MB 13; 14L MB 18 MB 23
Optics
Measuring
distance
a [mm]
Spot size M
90
[mm]
1 a = 80 mm 0.9 mm 0.7 mm 0.3 mm 0.1 mm
2 a = 160 mm 0.7 mm 0.6 mm 0.4 mm 0.2 mm
3 a = 250 mm 1 mm 0.8 mm 0.5 mm 0.3 mm
4 a = 660 mm 2.3 mm 2 mm 1.2 mm 0.7 mm
5 a = 1300 mm 5.5 mm 3.8 mm 2.8 mm 1.4 mm
6 a = 5600 mm 19 mm 15 mm 12 mm 6.4 mm
Aperture D [mm] * 19 mm 13.5 mm 10 mm 7 mm
* ) The aperture is the effective lens diameter
Measuring distance
The spot sizes, mentioned in the table above, will be only achieved at the measuring distances
of the corresponding optics. Decreasing or increasing the measuring distance enlarges the spot
size. Make sure that the measuring object is at least as big as the spot size. A tape measure can
be used to determine the distance between object and pyrometer. The measuring distance is
always measured from the front of the lens.
Instruments equipped with thru-lens view finder: The measuring object will be
shown in the view finder of the pyrometer as a sharp image only in the measuring
distance of the corresponding optics (e.g. optics 1 at 80 mm). The circle in the view
finder marks the position of the spot.
Instruments equipped with thru-lens view finder and laser targeting light: The
laser shows its smallest spot in the measuring distance of the corresponding optics (e.g.
optics 1 at 80 mm) and it marks the center of the spot, not its size.
Warning: To reduce the risk of injury to the eyes, do not look
directly into the targeting laser and do not point the targeting laser
into anyone's eyes. The instrument is equipped with a class II laser
that emits radiation.