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Internal RF Sensor temperature is considered questionable when it exceeds
70°C (quesHighTemp) or below -30°C (quesLowTemp)
If internal RF Sensor temperature is 80°C (powerDownTemp) the power is
reduced and measurement services are suspended. Power to the RF boards is
shut down and only the processor board remains powered on.
If internal RF Sensor temperature is 85°C (powerOffTemp), the power to all
boards is shutoff completely, with no communications with the RF Sensor or
ability to perform a software reboot. A power cycle, in addition to reduced
temperature, is required to resume operation.
The RF Sensor internal temperature is checked every 180 seconds. If the
temperature has been reduced to 65°C (powerBackUpTemp), the RF board
power supply will be re-established and the RF Sensor can resume
measurements.
Recommendations to correct or prevent exceeding temperature limits:
If the inside temperature of the RF Sensor is exceeding the limits mentioned
above and shutting down, try installing a sun shield or move the sensor so it is
not in direct sunlight.
If the inside temperature RF sensor is below the limits mentioned above and
will not start, try placing it in an insulated enclosure with a small heat source,
such as a light bulb.
Summary of RF Sensor internal temperature limits, indicators and actions:
+70 °C – generates a questionable High Temperature Alarm
-30 °C – generates a questionable Low Temperature Alarm
+80 °C – Is the Power Off Temperature limit. Power is reduced and
measurement services are suspended. Communication to the sensor
remains active and the processor board keeps power.
+65 °C - Power Back Up Temperature - Power is restored and
measurement services are resumed. Power is restored to the RF
boards.
+85 °C - Power Off Temperature - All power supplies are shut down
completely at this temperature, Sensors temperature must be
lowered to less than 65 °C and an RF sensor power cycle is required
to restore operation.
N6841A RF Sensor Installation Guide
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