5.8
Received signal level
The highest possible received signal level is required for precise measurement. With
increasing distance and/or contamination of the adjoining optical faces (sensor viewing
window/reflector), the received signal level decreases. This means an increase in signal
attenuation which you can read off as the dB value in the main menu.
The table below specifies the signal attenuation values in relation to the distance
between the distance sensor and the reflector. The values in the “Typical signal
attenuation” column represent the expected values when the measuring path and the
distance sensor are in perfect working order. If the signal attenuation value exceeds
the value in the “Maximum signal attenuation” column, check the condition of the
measuring distance and the adjoining optical faces. The distance sensor issues a
level warning if the signal attenuation value reaches the critical value of approximately
–96 dB. If the signal attenuation value then continues to rise, a level and plausibility
error is output, along with the measured value “0”.
Table 5: Attenuation values
Distance [m]
Typical signal attenuation [dB]
Maximum signal attenuation [dB]
10
–32
–37
20
–44
–49
35
–54
–59
60
–63
–68
100
–72
–77
130
–76
–81
200
–84
–89
220
–85
–90
300
–91
–96
–100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
1
10
100
1000
Attenuation in dB
Distance in m
1
2
3
4
Figure 15: Signal attenuation depends on the distance between device and reflector
1
Typical signal attenuation
5
MOUNTING
28
O P E R A T I N G I N S T R U C T I O N S | DL100 Pro PROFIBUS DP
8014755/19H8/2021-10-15 | SICK
Subject to change without notice
