Site design
Page 14
UltraWave Product Guide
Surface-mount applications
The post-mount bracket can also be used to mount an UltraWave unit on a fixed stable surface.
The hardware required for fastening the bracket to the surface is not included. If you are
considering a surface mount application, the transmitter receiver alignment must be carefully
planned, as the mounting bracket cannot be easily adjusted in the horizontal plane for surface
mount applications.
illustrates a surface mount UltraWave application.
UltraWave alarm reporting
The UltraWave system reports a sensor alarm when a valid target creates a disturbance in the
microwave field. If a large target (e.g., a vehicle) enters the microwave field and blocks the beam,
the UltraWave sensor goes into alarm and continues the alarm until the object leaves the field. If
the calibration parameters are outside the valid range at startup, or during operation, the
UltraWave system goes into constant alarm until the calibration problem is corrected. The receiver
unit also signals an alarm if it does not see the transmitter on startup.
Fast Alarm Response
The UltraWave receiver includes a Fast Response channel that bypasses the sensor’s advanced
signal processing algorithms, when enabled. This causes the UltraWave receiver to function like a
classic analog microwave sensor. With Fast Response enabled, UltraWave will trigger an alarm as
soon as the microwave signal exceeds the Threshold setting. The Fast Response channel
provides early alarm notification, but can also cause an increase in the nuisance alarm rate (NAR).
Fast Response is intended for use in high-security applications that include a sterile zone.
However, Fast Response should NOT be used in Sally Port areas.
Automatic gain control
The UltraWave microwave sensor system employs automatic gain control (AGC) to ensure the
received signal remains at an optimal level. If the receiver detects an increase, or attenuation of
the transmitted signal the AGC gradually adjusts the signal gain to maintain proper detection.
Figure 9 Surface mounting example
Note
The UltraWave sensor will not report an alarm if an object enters
the microwave field while the signal is being blocked.
Note
If the UltraWave signal is blocked continuously for a period that
exceeds 30 seconds, the system may be prone to nuisance alarms
or have a reduced probability of detection for 30 seconds after the
blocking object leaves the microwave field.
power and alarm
wiring in conduit
ground wire
ground rod
UltraWave unit
mounting height from
center of antenna to ground
ground level
mounting
bracket