3.14 CONDITIONAL DATA ACQUISITION
Conditional data acquisition is used to perform burst measurements whenever a sensor reading is greater than
a configured trigger limit. The sensor can be selected among those installed in the probe and the trigger limit
can be freely configured by operator. To perform the monitoring of the sensor reading, the probe asks the
operator for the configuration of a monitoring interval (from 10s to 1day).
During the measurement cycles, the probe wakes up at the configured interval to monitor the sensor
reading and to compare the sensor reading against the configured trigger limit. To save the battery
energy, the probe waits in OFF condition for the time between two consecutive sensor measurements.
Whenever the sensor reading is greater than the configured trigger limit, the probe starts to acquire a
burst of data. Data acquired from sensors is shown and stored in the probe data memory.
The data acquisition (burst measurements) takes place at the configured sampling rate and continues
until the selected sensor reading does not fall again under the configured trigger limit. There is no limit
to the amount of data acquired during a burst measurement. The cycle continues indefinitely until it is
interrupted by operator. Acting on the magnetic switch, it is possible to temporarily interrupt and
restart the measurement cycle. Each time the burst measurement cycle starts, a new cast is automatically
generated to separate the acquired data from the one stored before.
Whenever this command is selected from the data acquisition menu, the following message appears on
the PC screen:
Conditional Sampling setup
Monitoring time-out: 00:00:00 enter time [hh:mm:ss] < 00:01:00
The operator must enter the time-out used by the probe to monitor the sensor reading. The time-out can
be configured from 10s to 1day. Afterwards, the sensor to be used to condition the measurements can
be selected:
Parameter Logical Code
Press 000
Temp 001
Cond 002
O2Sat% 006
O2ppm 005
pH 007
Eh 008
Sensor logical code:0 enter new value< 2
The probe shows on the PC screen a list representing all the sensors installed in the probe. The operator
can select one of the shown sensors to be used as an acquisition condition by entering the numerical
value indicated under the logical code column. Once selected, the operator can enter the trigger value
used to start and/or stop the data acquisition cycle.
Sensor trigger value:0 enter new value< 30.0
The value must be entered in engineering values (ppm, dbar, °C, mS/cm, etc.) taking into consideration
the selected sensor, its measuring unit and its measuring range.
Therefore, a value of 100 is fine if the selected parameter is the oxygen saturation, but it is completely
wrong if the selected parameter is the temperature sensor, as 100°C cannot be measured by the OCEAN
SEVEN 310 probe. Therefore, this condition, even if accepted, will be never met by the temperature
sensor reading. Configuration of wrong trigger value may led the probe to misbehave.
The last parameter to enter is the sampling rate that will be used by the probe whenever the burst data
acquisition cycle starts.
1/Sample rate=[35..60000ms]:50
The operator can select a sampling rate between 0.1 and 28 Hz by configuring the associated time
between measurements expressed in ms, the most common are:
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