alarm will trip only if all sensor readings are 85°F or above
for a continuous 30-minute period.
7.
Repeat steps 2 through 6 for the other sensor if desired.
8.
Choose how long the logger should maintain a sensor alarm
once it has tripped. Select “Host has relaunched logger” if
you want the alarm to remain visible on the LCD until the
next time you relaunch the logger. Select “Sensor reading
within limits” if you want the alarm to clear once the sensor
reading returns to the normal range between the high and
low alarm limits. Select “Cleared with button press” if you
want the alarm to remain on until you press the Alarm/Stats
button on the logger.
9.
Click OK to save alarm settings.
Notes:
•
Once the logger is launched, alarms will trip as
determined by these settings. Logger alarms will display
on the LCD screen. Note that the alarm limits are only
checked when the logger’s LCD screen refreshes every 15
seconds.
•
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).
•
When you read out the logger, high and low alarm levels
will be displayed on the plot along with “Chan <#> Alarm
Tripped” and “Chan <#> Alarm Cleared” events showing
when the sensor alarm tripped and cleared. The “Chan
<#> 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).
Burst Logging
Burst logging is a logging mode that allows you to set up more
frequent logging when a specified condition is met. For
example, let’s say the logger is recording data at a 5-minute
logging interval and burst logging is configured to log every 10
seconds when the temperature goes above 85°F (the high limit)
or falls below 32°F (the low limit). This means the logger will
record data every 5 minutes as long as the temperature
remains between 85°F and 32°F. Once the temperature reaches
90°F, for example, the logger will switch to the faster logging
rate and record data every 10 seconds until the temperature
falls back below the high limit (or 85°F in this case). At that
time, logging then resumes every 5 minutes at the normal
logging interval. Similarly, if the temperature falls to 30°F, for
example, then the logger would switch to burst logging mode
again and record data every 10 seconds. Once the temperature
rises back to 32°F, the logger will then return to normal mode,
logging every 5 minutes.
To set up burst logging:
1.
Select Burst for Logging Mode in the Launch Logger
window. If Burst has already been configured for this
logger, click the Edit button in the Launch Logger window.
Note that you cannot set up alarms with burst logging. You
also cannot select the Stop Logging option “Never (wrap
when full)” if burst logging is configured.
2.
In the Burst Logging window, select a sensor. In the
example, the temperature sensor was selected.
3.
Select the High Limit checkbox if you want to set up a
condition in which burst logging will occur when the sensor
reading rises above the high limit value. Type in the value or
drag the red upper slider.
4.
Select the Low Limit checkbox if you want to set up a
condition in which burst logging will occur when the sensor
reading falls below the low limit value. Type in the value or
drag the blue lower slider.
5.
Repeat steps 2 through 4 for the other sensor, if desired.
6.
Set the burst logging interval, which must be less than the
logging interval. Select either a preset burst logging interval
or select Custom and enter your own interval. Keep in mind
that the more frequent the burst logging rate, the greater
the impact on battery life and the shorter the logging
duration.
7.
Click OK when done. This will return you to the Launch
Logger window. Click the Edit button next to Logging Mode
in the Launch Logger window to make additional changes.
Notes:
•
Once the logger is launched, the high and low burst
logging limits are only checked when the logger’s
LCD screen refreshes once every 15 seconds. Therefore,
if you set the logging interval to less than 15 seconds and
the sensor reading falls outside the limits, the burst
logging will not begin until the next 15-second refresh
cycle.
•
If high and/or low limits have been configured for more
than one sensor, then burst logging will begin when any
high or low condition goes out of range. Burst logging will
not end until all conditions on all sensors are back within
normal range.
•
The actual values for the burst logging limits are set to
the closest value supported by the logger. For example,
the closest value to 85°F that the logger can record is
84.990°F and the closest value to 32°F is 32.043°F.
