AVS Electronics ONE DT Manual Download Page 19

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General characteristics

OnE DT and OnE DT HP

are dual-technology, microprocessor-controlled volumetric sensors in which the combination

of a

Fresnel passive infrared lens

and a

planar microwave

create very effective protection against false alarms

in critical environments. OnE DT and OnE DT HP and are recommended for external protection.

OnE PA, OnE PA HP and OnE PA WS

are microprocessor-controlled volumetric sensors with

Fresnel passive

infrared lens

OnE PA WS

integrates a

single-frequency radio transmission module

that is

compatible with receivers and

controllers

from

AVS Electronics.

All models are equipped with:

Thermal compensation,

the sensor automatically adjusts the range as the ambient temperature changes,

however, despite this, the performance of the sensor can vary significantly depending on the particular tempe-
rature interval.

Accelerometer,

for the reporting tear and disorientation (does not detect vibration). Any

unauthorized removal

is signalled by the sensor as a tamper (option enabled by DEFAULT).

Anti-masking,

to detect obstacles that are placed to cover the sensor.

Connections (Models OnE PA, OnE DT, OnE PA HP and OnE DT HP)

The connections of the models

OnE PA

and

OnE DT

are made through a C-NC contact for signalling the Alarm and

a T-T contact for the signalling of the Tamper.
The connections of the models

OnE PA HP

and

OnE DT HP

are made through

RS485 serial,

to the

XSATHP

satellite or directly to the

AVS controllers provided.

Configuration

Models

OnE PA, OnE DT

and

OnE PA WS

are configured through the on-board

DIP SWITCHES

Models

OnE PA HP

and

OnE DT HP

can be configured through the on-board

DIP SWITCHES

or with the

XWIN

software.

First Power-On

The sensor is blocked for about 60 seconds, during which the LEDs flash and the anti-masking circuit performs a
self-regulation. At this stage, it is essential that the cover be regularly installed to allow the sensor to regulate itself
to the correct values.

AND operation (Models OnE DT and OnE DT HP)

The microprocessor constantly analyzes the signals coming from the infrared and microwave sections, which are
thus compared with the preset parameters; only when both technologies go into alarm within a time interval of about
10 seconds, will the alarm relay be activated and the blue LED light up.

ANTI-MASKING Operation (Not active with TAMPER OPEN):

When the sensor detects an obstacle, a time delay is activated during which the yellow LED flashes. If, at the end
of this time, the obstacle is not removed or the sensor goes into alarm, the Anti-mask signal is activated.

NOTE: However, this function does not guarantee that the sensor cannot be masked.
NOTE:

Keep the sensor lens free of dust or other filtering material that could alter its functioning.

NOTE: the instructions regarding the YELLOW LED refer to all models except the OnE PA WS.

INFRARED ANTI-MASKING Function

The infrared anti-masking circuit, which is present in all sensor models, consists of an active infrared RX receiver
and TX transmitter located above and below the PIR sensor, which detects obstacles (adhesive tape and almost all
paints) placed in front of the sensor up to a distance of about 10 cm. The signal is generated after about 30 seconds
from the detection of the obstacle, if the sensor does not generate an alarm in the meantime.
The signal is reset upon the removal of the obstacle.

MICROWAVE ANTI-MASKING Function

The microwave anti-masking circuit, present in models

OnE DT

and

OnE DT HP

, provides an alarm signal if

microwave reflective material (such as metal, wood, plastic, etc.) is brought within less than 1 metre. The signal is
generated after about 1 minute from the detection of movement within 1 metre, if the sensor has not generated an
alarm in the meantime.
The signal is reset as soon as an alarm is generated.

DIRTY LENS operation (Models OnE PA HP and OnE DT HP)

When the Anti-mask circuit detects that the average value of the signal stored in a certain time interval has undergone
a change of about 20%, the signal is sent to the controller and the

yellow LED

flashes slowly.

To restore the Lens dirty signal after cleaning the lens, you must power the sensor off and on.