The battery life of the AquaVent Wellhead is 8-10 Years, based on 1 reading per minute. More rapid readings will reduce the battery life. For example, if an AquaVent is setup in Continuous Mode at a sampling rate of 1 second, the battery will be depleted in approximately 3 months.
The Datalogger Sampling Mode section allows you to choose the sampling measurement type. Options for the AquaVent 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 AquaVent. There is a data compression option available for the AquaVent. This increases the memory capacity 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.
Figure 4-6 Linear Sampling Setup
In Event Based sampling mode, the AquaVent has a total memory of 25,000 readings of level and temperature.
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.
Event Based sample collection is the most memory efficient means of data collection. In Event mode, the AquaVent 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 AquaVent, 'LEVEL' or 'TEMPERATURE' is the selected parameter where change is monitored. The AquaVent 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 AquaVent memory, every 24 hours from the last recording, if no 'Change' occurs.
Figure 4-7 Event Based Sampling Setup
A schedule can be saved and applied to other AquaVents, by saving the Settings file (see Section 4.7).
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 AquaVent from recording for the specified duration.
Running totals of the number of readings still available, from the total possible, and the run time to date are shown. If the number of readings selected exceeds the datalogger's memory capacity an error message appears.
By checking Repeat, the AquaVent will continue to run through the schedule until its memory is full, or it is stopped.
Figure 4-8 Schedule Sampling Setup