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The Datalogger Sampling Mode section allows you to choose the sampling measurement type. Options are Linear, Event Based and Schedule.
Linear refers to a set time interval between collection of readings. Sample Rate can be any number from 0.125 seconds to 99 hours for the Levelogger Edge. There is a data compression option available for the Levelogger Edge. This increases the memory capacity of the Levelogger Edge from 40,000 readings to up to a maximum of 120,000. Check the Data Compression box to allow data compression.
Data Compression works by only saving data changes in memory. For example, if you have linear sampling set to record each second, and your water level varies a little for 60 seconds, the memory will only record incremental values for the 60 seconds. When your data is exported, it will display all 60 intervals with the corresponding level data.
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Figure 5-10 Linear Sampling Setup
(Click image to enlarge to full size)
Event Based sample collection is the most memory efficient means of data collection. In Event mode, the Levelogger will activate every sampling interval defined and check if readings have changed by the selected threshold (Change) from the last recorded reading.
For the Levelogger Edge, 'LEVEL' or 'TEMPERATURE' is the selected parameter where change is monitored. The Levelogger will record a new reading only if the specified change in the parameter has occurred.
A default reading will also be stored in the datalogger memory, every 24 hours from the last recording, if no "event" occurs.
Figure 5-11 Event-Based Sampling Setup
(Click image to enlarge to full size)
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Schedule Sampling allows you to select a logarithmic style sampling schedule adapted to the needs of each application.
Schedule Sampling is set by using the plus and minus buttons to add or subtract line items in the Schedule window. The maximum number of line items in a schedule is 30, each with its own sampling interval of seconds, minutes or hours and duration of seconds, minutes, hours, days or weeks. A 'Pause' interval can also be selected, which stops the Levelogger from recording for the specified duration.
Running totals of the number of readings still available, from the total possible 40,000 or 120,000, and the run time to date are shown. If the number of readings selected exceeds the Leveloggers memory capacity an error message appears.
By checking 'Repeat', the Levelogger will continue to run through the schedule until its memory is full, or it is stopped.
Figure 5-12 Schedule Sampling Setup
(Click image to enlarge to full size)
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