Field Operations; Ending The Unattended Data Acquisitions; Unattended Burst Sampling; Preliminary Configuration - idronaut Ocean Seven 304Plus Operator's Manual

SECTION FOUR – SELF RECORDING
Once the sampling rate is configured the following message appears on screen;
Confirm: [0)No 1)Yes]
The CTD switches OFF by itself configuring the first time-out at which the selected sensor will be
monitored. In case the deployment should be done later on, it is possible to disconnect the USB
laboratory cable and rotate the magnetic rotary switch to the OFF position.

4.4.2. Field operations

At the sampling site, switch ON the CTD by positioning the magnetic switch arm to the red dot; the
CTD wakes up, monitors the selected sensor and, if needed, starts to acquire and store data.
When the CTD returns to the surface, you can switch it OFF by rotating the magnetic switch arm to
the OFF position; data acquisition ends.
Note
The data acquisition ends whenever: i) The CTD battery has run down. ii) The data memory is full. Iii)
The operator decides to stop it.

4.4.3. 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 starts to wake up and the start-up messages appear.
 Type the <CTRL-C> key until the main menu appears.
 The unattended conditional sampling cycle is ended and the CTD is working in the default mode,
waiting for the operator's commands.
4.5.

UNATTENDED BURST SAMPLING

Burst sampling is useful when the CTD is used to monitor the environment for long periods of time.
Some examples of configuration and CTD behaviour are reported below.

4.5.1. 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 main menu appears.

Check and set up the RTC, if needed.

From the Main Menu, select the data acquisition menu and then the "Burst Sampling" function
answering the following question:
Total number of bursts: 8 < 10
Number of measurement cycles or "Burst" to be carried out.
Data sets per single burst: 10 < 10
Number of data sets for single measurement cycle or "burst".
Time between consecutive bursts: 00:01:00[hh:mm:ss]<
Time interval between consecutive burst cycles. The minimum interval time is 10 s.
IDRONAUT – Brugherio (MB)
OCEAN SEVEN 304Plus CTD
37
12-2015