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5 Technical Description
1. Stainless steel housing
2. Optics
3. Type label
4. LED (indication of switch status)
5. Potentiometer (setting of switch threshold)
6. Connector for cable
5.2 Optics
The switches are equipped ex works with one of the following optics. These lenses are focusing to certain dis-
tances. In these distances each lens achieves its smallest spot size. Changing the distance to the measuring
object, it comes to an blur, that results in an greater measuring field. Please notice that the measuring object
must be as least as big as the spot size to avoid measurements of background radiation.
The name of the optics (e.g. optics 400) shows the measuring distance in mm (here: 400 mm, measured at
the front of housing) in which it has the smallest spot size (e.g. 5.5 mm).
5.2.1 Available optics
The following drawings show the size of the spots (in mm) in dependence of the measuring distance.
a
d
in mm
b
m
in mm
a
Distance from front of housing
b
Measuring field diameter
5.2.2 Setting the optic
For exact measurement of the object temperature the switch must be aligned correctly onto the object. The
instruments are not equipped with a sighting so that the aligning must be done thermally. When measuring
a hot object in front of a cooler background, it usually suffices to align the switch to achieve the highest
temperature response.
The LED targeting light shows its smallest spot in the measuring distance of the corresponding optics. It marks
the center and the size of the spot.
5.3 Operating elements
The controls and indicators are located on the rear side of the device. For the meaning and operation of
individual elements see Operation of the pyrometer (section 7) at page 9.
6
Figure 1: Structure of the pyrometer
170
220
400
600
2.5
4.0
5.5
7.0
800
1,000
1,400
10.5
14.0
18.0
KS 218 - TS KG 218 - TS
1,600
1,800
2,000
21.0
24.5
28.0
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