INFRATHERM
pyrometer IS 50-LO/GL
19
6.5 Accessories
(option)
As a standard accessory, the
INFRATHERM
IS 50-LO/GL is provided with an air purge tube and mounting bracket (also
see section
Reference numbers
). For corresponding applications various optional sighting tubes are available.
Air purge unit
The
air purge unit with mounting support
protects the lens from contamination with dust
and moisture. It has to be supplied with dry
and oil-free pressurized air (approx. 65... 100
l/min or 4 ... 6 m
3
/h) and generates an air
stream shaped like a cone.
Ceramic sighting tube
Mounting support
Bayonet fixing
Inconel-
sighting
tube
6.6 Sighting
tubes
Stainless steel (Inconel
®
)
Ref. nr.: 3 835 300
An Inconel tube with a 600 mm
length is available upon request.
∅
26.64
∅
33.5
Ceramic tube
Ref. nr.: 3 836 830
∅
27
∅
35
7 Optics
A pyrometer operates passively. It receives heat radiation, from the measured object, which passes through the lens and
is then converted to an electrical signal. The measured object may be at any distance from the pyrometer! However, the
farther the measured object is from the pyrometer, the larger the area (spot size) that will be measured by the pyrometer.
The object (or the area on the object) that you want to measure has to be as big (or bigger) than the pyrometer's spot
size, for that distance.
The following drawing show the pyrometer's spot sizes (minimum required sizes for the measured object) and the focal
distances, in relation to the distance from the pyrometer. The spot size at a distance of 0 mm (a = 0) is 8.8 mm
(M = 8.8), which is the diameter of the aperture behind the lens.
58
107
5000
3000
58
31
18
2000
1200
600
300
8,8
0
9
12
10
15
20
12
32
Measuring distance
a [mm]
Spot size M [mm]
Minimum tube or hole diameter
(incl. safety tolerances)
Optics
Note:
Please note that the optical profiles show nominal dimensions. The spot size diameter or
the focal distance may be slightly different due to lens tolerances.
