The Datalogger Sampling Mode section allows you to choose the sampling measurement type. Options for the Levelogger Edge 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 and 2 seconds to 99 hours for the LTC 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.
The battery life of the Levelogger Edge is 10 Years, based on 1 reading per minute. More rapid readings will reduce the battery life. For example, if a Levelogger Edge is setup in Continuous Mode at a sampling rate of 1 second, the battery will be depleted in approximately 4 months.
If a Levelogger Junior Edge or LTC Leveloggger Edge is used at a sampling rate of 5 seconds, the battery will be depleted in approximately 2.4 months.
Figure 5-9 Linear Sampling Setup
The LTC Levelogger Edge and Levelogger Junior Edge record using Linear sampling mode only.
The Levelogger Junior Edge has a sample rate of 0.5 seconds to 99 hours. The LTC Levelogger Edge has a sample rate of 5 seconds to 99 hours.
Event Based sample collection is the most memory efficient means of data collection. In Event mode, the Levelogger will be activated at every defined ‘Sample Rate’ to check if readings have changed by the selected ‘Change’ from the last recorded reading.
For the Levelogger Edge, 'LEVEL' or 'TEMPERATURE' is the selected parameter where change is monitored. You can also select 'CONDUCTIVITY' for the LTC Levelogger Edge. The Levelogger will record a new reading only if the specified change in the parameter has occurred, at the specific point in time, as defined by the 'Sample Rate'.
A default reading will also be stored in the datalogger memory, every 24 hours from the last recording, if no ‘Change’ occurs.
In Event Based sampling mode, the Levelogger Edge has a total memory of 24,000 sets of readings and the LTC Levelogger Edge has a total memory of 18,650 sets of readings.
In Event-based sampling mode, battery consumption is mainly a function of sampling rate. Therefore, with a smaller sampling interval, battery power will be used up quickly whether readings are stored or not.
Figure 5-10 Event-Based Sampling Setup
The Rainlogger records in Event Based mode only. It records the tip times of a connected tippingbucket. Rainloggers using older firmware record in linear mode.
Schedule Sampling allows you to select a logarithmic style sampling schedule adapted to the needs of each application.
A schedule can be saved and applied to other Leveloggers, or a Leveloader, by saving the Levelogger Settings file (see Section 5.7).
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 (27,000 readings for the LTC Levelogger Edge), 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 5-11 Schedule Sampling Setup