Adaptive Threshold Discrimination (Atd) - Xtrails ADPRO PRO-18 Planning And Commissioning Manual

ADPRO Passive-Infrared (PIR) PRO Series by Xtralis
The individual sensitivity setting is saved.
Nominal Ranges
Information on the nominal ranges of models of detectors are in the technical data in chapter
16.
9.2

Adaptive Threshold Discrimination (ATD)

Any thermal radiation will be converted by the pyro element into an electrical signal; as will
smaller signals, such as those produced by animals. These small signals are called 'noise
signals'.
When the ATD function is left off, this leads after a certain time to a summation of the signals
and thus to a low signal-noise ratio. This can lead to false alarms. This system would be too
sensitive.
If the ATD function is on, these signals would be evaluated by complex algorithms, and the
Alarm Threshold Level would be automatically raised by an adequate amount. To make the
system not completely insensitive, this is only possible to a factory preset maximal value.
With this function false alarms can be avoided and an optimal detection rate achieved.
The ATD function is activated by default.
Standard DIP Switch
Settings
Deactivation
 Turn DIP switch 3 to "OFF".
DIP Switch Setting
Doc. 20780_03
NOTE!
Do NOT change the settings of DIP switches 1 and 2, because the
individual sensitivity settings are set by the hardware installation
override.
NOTE!
If the required detection range coincides with the denominator replaced
by the range, no adjustment of the detection distance is necessary.
If the required coverage area is smaller than the nominal range, there
may be frequent false alarms.
NOTE!
1. To minimize the occurrence of alarms the ATD function should
always be activated in normal operation.
2. As already described before, this function must be turned off
during the walk test, otherwise, because the test subject will
frequently set off the alarm, it will be raised from the start and
the system itself, set to the highest possible sensitivity settings,
will only be tripped wrongly.
3. For the last walk test the ATD function must be turned on.
DIP-Switch
3 ON
DIP-Switch
Planning and Commissioning Manual
Status Function
ATD
Status Function
37