Functioning
7
Installation and programming manual
2-3
“Antimasking” function
The detector is equipped with an active IR anti-masking function to protect the
PIR. It emits a tampering signal within 3 minutes. The output of this function is
the MASK terminal block.
In a standard configuration, this terminal block can be connected to a 24h active
line or to a control unit input appropriately programmed to send fault messages.
When the detector identifies a masking attempt, the four LEDs flash
simultaneously until the masking condition is resolved.
To enable the correct operation of the masking detection system (Anti-masking),
allow the detector to study and analyse the environmental conditions of the area
to be protected. This procedure is mandatory to guarantee the correct operation
of the anti-masking channel.
Anti-masking sensitivity can be adjusted trough the DIP switch 5 (table 3, T):
•
“OFF”, low sensitivity
•
“ON”, high sensitivity
Follow the procedure below:
1.
Make the connections to the detector terminal box, leaving the DIP switch 5
set to OFF.
2.
Once powered, close the cover and run all the detection tests required.
3.
Open the cover and set the anti-masking sensitivity via the DIP switch 5.
4.
Close the cover immediately (maximum within 10 seconds).
5.
Stay at least 1 meter from the front part of the detector for at least 4 min-
utes.
Table 7: Working examples
A
Detector
B
Protected area limit
C
The pet is detected only by two of the three sensors (lower PIR and MW).
No alarm
D
The person is detected by all three sensors (upper PIR, lower PIR, MW).
Alarm
E
The person is detected by two sensors (upper PIR and MW).
No alarm
F
If the detector is installed on a tilted wall, or pole, the detection range will be
reduced.
Both, upward as downward.
Uncorrected installation
No alarm
D
E
C
B
A
E
B
F
