You can set an alarm to trip when a sensor reading rises above or falls below a specified value on certain logger models. Note: The U30 Station also has alarms capability; see Setting Alarms on a HOBO U30 Station for more details.
To set an alarm:
Note: The actual values for the high and low alarm limits are set to the closest value supported by the logger. For example, the closest value to 85°F that the UX100 series logger can record is 84.990°F and the closest value to 32°F is 32.043°F. In addition, alarms can trip or clear when the sensor reading is within the logger specifications of 0.02°C resolution. This means the value that triggers the alarm may differ slightly than the value entered. For example, if the High Alarm is set to 75.999°F, the alarm can trip when the sensor reading is 75.994°F (which is within the 0.02°C resolution).
Once the logger is launched, alarms will trip as determined by these settings. For UA-001 loggers, a "high" or "low" LED will blink when an alarm is tripped; alarms are checked at every logging interval. For other models, logger alarms will display on the LCD screen. The alarm limits are checked when the logger's LCD screen refreshes. See the logger manual for details on LCD screen refresh rates.
When you read out the logger, high and low alarm levels will be displayed on the plot. In the example below, the temperature rose above 85°F so those readings are in the red, or high alarm, portion of the plot. The temperature never fell below the low alarm limit, which is the blue portion at the bottom of the plot. Some logger models also display alarm events showing when the alarm tripped (and cleared if applicable). In this example, there are "Chan 1 Alarm Tripped" and "Chan 1 Alarm Cleared" events showing when the temperature alarm tripped and cleared. The "Chan 1 Alarm Cleared" event contains the value that was furthest out of range for the sensor before the alarm cleared (see the Points table for the actual value).
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