6
3 Functions and features
The unit continuously detects the level optically and generates output signals
according to the parameter settings�
3.1 Application areas
• The optical level sensor detects media in the measuring range of
20�0���1000�0 cm� They are displayed in relation to a previously defined refer-
ence level�
• It has a background suppression at > 10���100 m�
• Two output signals can be generated, depending on the function mode�
The distance between the sensor and the background must be limited
to max� 100 m by the customer� Otherwise the measured value may be
ambiguous. → 5.1 Installation conditions
3.2 Restriction of the application area
• The unit is suited for granulates, bulk material and cloudy liquids�
• Dust and vapour can impact the quality of the measurements�
• The unit is not suited for oils and clear liquids�
4 Function
4.1 Switching function
4.1.1 Hysteresis function
The outputs change their switching status when the value is above or below the
set switching limits� The hysteresis is the distance between the set and reset
points� The hysteresis keeps the switching status of the output stable if the meas-
ured value varies about the sensing range�
Both outputs (OUT1 and OUT2) can be set as hysteresis function (→ 10.3.3 and
→ 10.3.6)�
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