idronaut Ocean Seven 304Plus, Operator'S Manual

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SECTION FOUR
–
SELF RECORDING
IDRONAUT – Brugherio (MB) OCEAN SEVEN 304 Plus CTD 12-2015
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4.3.3. Ending the unattended data acquisitions

Run the “ITERM” programme.

Connect the CTD to the personal computer using the USB laboratory cable and then switch ON
the CTD.

The CTD start-up messages appear.

Type the <CTRL-C> key until the main menu appears.

The continuous unattended data acquisition cycle is ended and the CTD is working in the standard
mode, waiting for the operator’s commands.
4.4. UNATTENDED PROFILES USING THE CONDITIONAL ACQUISITION
This type of acquisition is used to automatically gather and store data at the maximum possible speed,
conditioned to the overcoming of a trigger value of the selected reference parameter. After
establishing the communication with the CTD, proceed as follows.
4.4.1. Preliminary configuration

Install new batteries or recharge the battery pack (optional NiMH battery pack).

Run the “ITERM” programme.

Connect the CTD to the personal computer using the USB laboratory cable and then switch ON the
CTD.

The CTD main menu appears.

Check and set up the RTC, if needed.

Select the “DATA ACQUISITION MENU” and then select the “CONDIT IONAL DATA
ACQUISITION”.

Answer the following question:
Conditional Sampling
Monitoring time-out [5s to 1day]: 5
Monitoring time-out used by the CTD to judge the value of the “condition” sensor. The minimum
configurable time-out is 5 seconds, the maximum is one day. The CTD waits for the time between
consecutive time-outs in OFF condition thus reducing the power consumption. The monitoring
timeout affects the CTD power consumption, therefore a careful planning should be considered.
Sensor to monitor: 0)Pressure, 1)Temperature, 2)Conductivity
Select sensor: 0
Select the sensor to monitor in order to judge whether or not to start a sampling cycle.
Sensor trigger value: 10
Trigger value use by the CTD to start a a data acquisition cycle. The trigger value must be configured
in engineering units. Obviously, the EE unit depends on the selected sensor: i.e. pressure dbar,
temperature °C, conductivity mS/cm.
Data acquisition scan rate [125ms]: < 125
Define the scan rate at which the acquisition will be performed. The parameter is configured in
milliseconds. The minimum value is 125 ms and can be increased in step of 125 ms.
Sampling Rate Set-up parameter
8 Hz 125 ms
6 Hz 166 ms
4 Hz 250 ms
2 Hz 500 ms
1 Hz 1000 ms
0.1 Hz 10000 ms