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LBK System Series| Instruction manual v1.2 SET 2021 |SAF-UM-LBKBus-en-v1.2|© 2020-2021 Inxpect SpA
4. Functioning principles
4.11 Anti-tampering functions:anti-masking
4.11.1 Masking signal
The sensor detects the presence of objects that could obstruct the field of view. When the system configuration is
saved, the sensor memorizes the surrounding environment. If the sensor subsequently detects variations in the
environment that could influence the field of view, it sends a masking signal to the control unit. Upon receiving a
masking signal, the control unit deactivates the safety outputs.
Note: the masking signal is not guaranteed in the presence of objects which cause reflection effects that bring their
RCS below the minimum detectable threshold.
4.11.2 Environment memorization process
The sensor starts the surrounding environment memorization process when the Inxpect Safety application
configuration is saved. From that moment, it waits for the system to exit the alarm status and for the scene to be
static up to 20 seconds, then scans and memorizes the environment.
NOTICE: if the scene is not static during the 20 seconds interval, the system remains in a fault status (Signal error)
and the system configuration must be saved again.
It is recommended to start the memorization process after at least 3 minutes from turning on the system to
guarantee that the sensor has reached the operating temperature.
Only at the conclusion of the memorization process it is possible for the sensor to send masking signals.
4.11.3 Causes of masking
Possible causes of masking signals are presented as follows:
l an object that obstructs the field of view of the sensor has been placed in the detection field.
l the environment in the detection field changes significantly, for example, if the sensor is installed on
moving parts or if there are moving parts inside of the detection field.
l the configuration was saved with sensors installed in an environment that is different from the working
environment.
l temperature fluctuations.
4.11.4 Masking signal when the system is turned on
If the system was off for several hours and there were temperature fluctuations, the sensor might send a false
masking signal when it is turned on. The safety outputs activate automatically within 3 minutes when the sensor
reaches its working temperature. This does not happen if this temperature is still very far from the reference
temperature.
4.11.5 Sensitivity level
The anti-masking function has four levels of sensitivity:
Level Description Example application
High The system has the highest sensitivity to
changes in the environment. (Suggested
level when the field of view is empty up to
the set masking distance)
Installations with an empty environment
and a height of less than one meter, where
objects could occlude the sensor.
Medium The system has low sensitivity to changes
in the environment. Occlusion must be
evident (deliberate tampering).
Installations with a height of more than one
meter, where masking is likely to occur only
if voluntary.
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