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Features of SNS Battery-powered Sensor Devices
The red LED flashes to alert when the sensor device detects that a threshold that is programmed in
the device has been exceeded. The red LED also indicates that a transmit attempt has just finished.
The internal green LED indicates that the sensor device is connected to a network. When in sensor
mode, the green LED will flash when a connection is made. When in setup mode (the programming
cable is connected to the sensor), the green LED will remain on continuously when a connection is
established. In setup mode, the red LED never comes on.
Beeps
When the service button is pushed, the sensor device beeps.
The sensor device also beeps when monitoring thresholds are set in the sensor device and the
device enters (and exits, depending on the configuration) an alarm state. If you do not want to hear
alarm beeps, remove the alarm jumper. The alarm jumper is located inside the sensor device, as
shown in Figure 4, Figure 11, and Figure 12.
Monitoring Thresholds
During configuration, battery-powered sensor devices permit you to set temperature and humidity
monitoring thresholds in the AMP or in both the AMP and the sensor device itself. In order to
achieve maximum benefit from SNS battery sensors, careful thought should be given to where
alarm thresholds are set as well as the frequency with which sensor devices report readings to the
AMP.
If thresholds are set in the AMP, but not in the sensor device, the alarm state is not detected until
the sensor device transmits scheduled readings to the AMP and the AMP recognizes that a reading
is out of limits. Depending on how frequently the sensor device is configured to transmit readings to
the AMP, a period of time may elapse before the AMP creates an alert for the out-of-range
condition.
If thresholds are set in the sensor device and these thresholds are exceeded or, depending on the
configuration, exceeded for a period of time, the sensor device enters an alarm state and transmits
readings to the AMP. However, thresholds set in the sensor device can only be changed on a
device-by-device basis through reconfiguration.
Primex Wireless, Inc.
Figure 12: Inside Model SNS2THS-2
SNS™ Temperature and Humidity Sensors Installation Guide
Monitoring Thresholds
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