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47UPS Network Management Card 2 User’s Guide
Thresholds. For each sensor, you set the same types of thresholds for temperature and (if supported)
humidity measured at the sensor.
Hysteresis. Use the Hysteresis value to avoid getting repeated alarms for the same temperature or
humidity violation. With the Hysteresis value you can specify how far past a threshold the temperature or
humidity must go to clear the threshold violation. (After a threshold violation is cleared, it is subject to
being breached again, and therefore it can cause another alarm).
• For maximum and high threshold violations, the clearing point is the threshold minus the
hysteresis value you input.
• For minimum and low threshold violations, the clearing point is the threshold plus the hysteresis
value.
If the temperature or humidity that causes a violation tends to waver slightly up and down, you could
increase the value for temperature hysteresis or humidity hysteresis to avoid multiple alarms. When the
hysteresis value is too low, such wavering can cause and clear a threshold violation repeatedly, triggering
multiple alarms.
Example of falling but wavering temperature: The minimum temperature threshold is 12°C, and the
temperature hysteresis is 2°C. The temperature drops below 12°C, violating the threshold and causing an
alarm. It then wavers up to 13°C and then down to 11°C repeatedly, but
— because of the 2°C hysteresis
value
— no clearing event and therefore no new violation or alarm occurs. For the existing violation to
clear, the temperature would have to rise above 14°C (more than 2°C above the threshold).
Example of rising but wavering humidity: The maximum humidity threshold is 65%, and the
humidity hysteresis is 10%. The humidity rises above 65%, violating the threshold. It then wavers down
to 60% and up to 70% repeatedly, but no clearing event and therefore no new violation occur. For the
existing violation to clear, the humidity would have to drop below 55% (10% past the threshold).
Alarm
Status
One of the following is displayed:
• Normal if this sensor is not reporting an alarm condition.
• If this sensor is in an alarm state, the text of the alarm, indicating which threshold is violated,
and the severity of the alarm, indicated by color (red for critical, orange for warning).
Thresholds See the next two sections for descriptions of the configurable thresholds and Hysteresis values.
Threshold Description
Maximum If the threshold for maximum temperature or for maximum humidity for the sensor is
exceeded, an alarm occurs.
High If the threshold for high temperature or for high humidity for the sensor is exceeded, an alarm
occurs.
Low If the temperature or humidity drops below its low threshold for the sensor, an alarm occurs.
Minimum If the temperature or humidity drops below its minimum threshold for the sensor, an alarm
occurs.
Parameter Description