RayTek MI3, Руководство по эксплуатации

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Installation
MI3
Rev. F1 05/2013
23
5 Installation
5.1 Positioning
Sensor location depends on the application. Before deciding on a location, you need to be aware of the
ambient temperature of the location, the atmospheric quality of the location, and the possible
electromagnetic interference in that location. If you plan to use air purging, you need to have an air
connection available. Wiring and conduit runs must be considered, including computer wiring and
connections, if used.
5.1.1 Distance to Object
The desired spot size on the target will determine the maximum measurement distance. To avoid
erroneous readings, the target spot size must completely fill the entire field of view of the sensor.
Consequently, the sensor must be positioned so the field of view is the same as or smaller than the
desired target size. For a list indicating the available optics, see section 3.2
Optical Charts , page 15.
The actual spot size for any distance can be calculated by using the following formula. Divide the
distance D by your model’s D:S number. For example, for a unit with D:S = 10:1, if the sensor is
400 mm (15.7 in.) from the target, divide 400 by 10 (15.7 by 10), which gives you a target spot size of
approximately 40 mm (1.57 in.).
Figure 10: Proper Sensor Placement
5.2 Installation Schemes
5.2.1 Comm Box (metal)
The basic stand-alone configuration consists of one sensing head interfaced to one metallic
communications box. The sensing head provides all IR measurement functionality. The
communications box provides an externally accessibly user interface and display, advanced signal
processing capability, field wiring terminations and fieldbus functionality with optional RS485
communication interface.
Back-
ground
Target greater than spot size
Target equal to spot
Target smaller than spot size
best critical
incorrect
Sensor
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