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Principle of operation: Sensors are read sequentially, at a frequency up to 30
seconds and the resulting values are stored. These values are logged and optionally
uploaded via an LTE connection. Note that the CO2sensor value is measured as an
average of 10 measurements in a 120 second period.
When logging all 13 channels of data the logger has capacity to store 1,005,000
readings at a minimum logging interval of 30 seconds. Each log interval will record 1
reading per configured channel. Using Darca Plus the logger may be operated in
two modes, either ‘Stop when full’ or ‘Continuous’. In continuous mode once the
logger memory is filled the oldest 2000 readings are discarded and logging
continues. In ‘stop when full’ mode the logger will cease recording new data once
1,005,000 readings have been saved.
Data is optionally uploaded to Darca Connect by an LTE-M/NB-IoT modem. The
frequency of data upload may be configured by the user, using Darca Plus to set the
upload interval parameter. If the upload interval is set to 0 the modem is powered
off and unused. The upload feature does not delete data from the logger.
In operation the LCD display will indicate battery charge capacity and memory
available capacity. The storage in use is indicated by up to 16 indicators at the
bottom of the display. The image below indicates the memory is almost full.
The display will cycle through values for each configured channel, then display the
current logger time and either the letter L, N or R.
L: logging
N: not logging, data in memory
R: reset not logging, no data in memory
If the battery runs out of power data will remain stored on the logger.
*Settle time is 24 to 48 hours after power-up. Please allow for this if the unit has
been in storage.
