User's Manual

GlobalTrak ™ GT Lite Operation and Maintenance Manual
GT Lite Sensor Suite
GT Lite contains 7 onboard sensors; 4 digital and 3 analog. Additionally external analog and
digital sensors can be wired to the device. Below is a description of the standard sensor suit.
Temperature Sensor
GT Lite includes an onboard temperature sensor accurate to ± 1.5˚C over its entire range of
-40˚C to + 85˚C. A high and low threshold is user configurable. If the temperature crosses
a threshold, an alarm is immediately generated. The alarm is only re-armed after crossing
back into a non-alarm state.
Optic Sensor
GT Lite includes an optic sensor to read ambient light through the sensor shown in Figure 2
above. A high threshold is user configurable. If the light level crosses the threshold, an
alarm is immediately generated. The alarm is only re-armed after crossing back into a non-
alarm state.
Shock Sensor
GT Lite includes a shock sensor to detect impacts on the device. A high threshold is user
configurable. If there is an impact on the device above the threshold, an alarm is
immediately generated. The alarm is immediately rearmed.
Door Sensor (optional)
GT Lite has an option to include a door sensor. The door sensor is typically a magnetic
proximity sensor that is either installed internal to the device or external via the external
connector. There is also an option for a plunger switch for container door mounting. If
enabled, alarms are generated when the sensor changes state (ex. door open to door closed).
Mount Sensor
GT Lite has an internal mount sensor. The sensor is an internally mounted magnetic
proximity sensor. If enabled, alarms are generated when the sensor changes state (ex.
mounted to unmounted). The location of the mount sensor is shown in figure 4 above. In
order for the device to be considered mounted, the magnet must be within 2 inches (5 cm)
from the sensor.
Motion Sensor (Note: Motion sensor not currently enabled)
GT Lite has an internal motion sensor to detect when the device is moving. The motion
sensor has configurable timeouts to determine when the device is moving or stopped. For
example, the device must be moving for X number of seconds before it is considered in
motion or it must be stopped for Y number of seconds to be considered stationary. As noted
above, being in motion can trigger a different reporting interval.
Prepared: R. Straz Date: July 25, 2007 Page 13 of
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