
Model 4525 Gate Monitor
Operator’s Manual
Ludlum Measurements, Inc.
Page 3
May 2018
The software provides audible and visual indications of the current status of the
RPMs. These include radiation alarms, background failures, power failures, low
battery, and infrared failures.
The software supports a network-attached camera, which allows an image to be
captured when a vehicle enters or exits the RPM. The image can be set to
trigger from 0 to 9 seconds to provide some flexibility for various camera
mounting schemes. These images are stored as standard JPEG files and may
be captured for every occupancy or only for occupancies that alarm.
In addition to the software, an optional hardware remote may be included,
which has status lights and a reset switch. The hardware remote can be used to
reset alarms and view the current status when the Supervisor computer is not
available or located in a area that is not near the RPM. When an alarm occurs,
pressing the RESET button once will silence the audible alarm. Pressing the
RESET button a second time will clear the alarm. Holding the RESET button
down for approximately 10 seconds will reboot the RPM.
Optional system accessories include a strobe/horn, an external video camera in
weatherproof enclosure, and detector stand sets.
When a radiation alarm occurs, the Supervisor and any Echo stations will
sound an audible alert. Once the vehicle has cleared the RPM, an alarm
window will be displayed showing a profile graph of the occupancy, which
detector panels in the RPM alarmed, and a camera image if available. The
profile graph plots the background during the occupancy with the Y-Axis
representing the gamma reading while the X-Axis represents the length of the
vehicle. Vertical lines indicate the beginning and end of the occupancy.
If enabled, the system will determine if the alarm is a Naturally Occurring
Radioactive Alarm (NORM). NORM consist of materials enriched with
radioactive elements found in the environment, such as uranium, thorium, and
potassium and any of their decay products such as radium and radon. These
types of alarms are characterized as having a high background over the entire
length of the occupancy rather than the "spike" of a typical gamma alarm.
All data are stored into a Microsoft Access database. The following tables are
used:
Alarms.MDB – Stores all occupancy data including readings and
alarm status for alarming occupancies.
NoAlarms.MDB – Stores all occupancy data, including readings
and alarm status for all occupancies.