Adjusting The Required Measuring Distance - LumaSense Technologies mpac IN 140/5-L Betriebsanleitung

IMPAC pyrometers IN 140/5 · IN 140/5-H · IN 140/5-L
Measuring distance
a [mm]
a = 159 mm
a = 178 mm
a = 235 mm
Aperture D [mm] *
Measuring distance a [mm]
a = 163 mm
Aperture D [mm]
)
* The aperture is the effective lens diameter. It is depending on the pullout length. The biggest aperture value belongs to the fully extended
objective (S = 26), the smallest aperture value for pullout length S = 0. Intermediate values have to be interpolated.
)
**
Only for instruments IN 140/5-L
The spot sizes, mentioned in the table above, will be only achieved at the adjusted distance. Decreasing or
increasing the measuring
distance enlarges the spot
size. Spot sizes for interme-
diate distances, that are not
shown on the optical profiles,
may be calculated using the
following formula:
The InfraWin program includes a Spot size calculator that roughly
Note:
estimates the unknown values.
The measuring object has to be bigger or at least as big as the spot size of the
Note:
pyrometer.
7.1

Adjusting the required measuring distance

The required measuring distance must be adjusted to achieve the spot sizes mentioned in the tables above.
This can be done between the smallest and the biggest limit value.
For releasing the optics has to be turned anticlockwise. Then it
can be pushed or pulled to find the correct measuring distance.
For fixing the optics has to be turned clockwise.
Adjusting the measuring distance with help of the table:
The table mentions the minimum and maximum measuring dis-
tance for each optics. This corresponds to the longest or the
shortest objective length. As an example a further value between
max. and min. is shown. The objective length "S" can be meas-
ured with a caliper.
The following methods can be used for measuring distances:
Adjusting the measuring distance with help of the thru-lens view finder:
The focusable optics is correctly adjusted to the required distance, if the measuring object is shown as a
sharp image in the view finder. A circle marks the position of the measuring spot.
Adjusting the measuring distance with help of the laser targeting light:
On the focused measuring distance the laser has its smallest spot size and is illustrated exactly.
12
Focusable optics IN 140/5-L
Spot size M [mm]
90
MB 14 and MB 16
1.3
1.6
2.2
)
Fixed optics IN 140/5-L
S
Aperture D
Spot size M
90
MB 25
0.9
1.1
1.5
14 to 17
Spot size M [mm] MB 15
90
0.9
17
a
1
a
a
2
Ø M
2
a
2
= − +
M (M D)
a
2
push / pull
[mm] Pullout length
S [mm]
26
13
0
Ø M
Ø M
1
a
= 1 +
M ( M
D
1
a
fix
release
Objective length S
−
) D D