Self Recording; Unattended Profiles In Function Of Pressure Increments; Preliminary Configuration; Field Operations - idronaut Ocean Seven 304Plus Operator's Manual

SECTION FOUR – SELF RECORDING
4.

SELF RECORDING

The following section describes, by means of step-by-step procedures, how to configure and perform
unattended data acquisitions in function of pressure and/or time intervals, and how to retrieve data
stored in the CTD internal memory.
4.1.

UNATTENDED PROFILES IN FUNCTION OF PRESSURE INCREMENTS

This type of acquisition is used to automatically gather and store data in function of the pressure
increments, whenever the CTD is deployed and lowered in water. After establishing the
communication with the CTD, proceed as follows.

4.1.1. Preliminary configuration

 Install new batteries or recharge the battery pack (optional NiMH battery pack).
 Run the "ITERM" programme.
 Connect the CTD to the computer using the USB laboratory cable and then switch the CTD ON.
 The CTD main menu appears.
 Check and set up the RTC, if needed
 Using the sensor calibration function, perform the pressure sensor offset zeroing.
 From the Main Menu, select the "DATA ACQUISITION MENU" and then select the "LINEAR".
 Answer the following questions:
Pressure acquisitions
Pressure acquisition step [dbar]:0.100000 < 1.0
Pressure interval that will be used during the acquisition cycles to store data in memory.
Data Set per acquisition:50 < 3
Number of data set to store for each pressure interval.
Confirm: [0)No 1)Yes]
 Now, the CTD switches OFF by itself and is ready to perform the data acquisition.
 Disconnect the USB laboratory cable and rotate the magnetic rotary switch in OFF position.

4.1.2. Field operations

Once you have reached the sampling site, switch ON the CTD by positioning the magnetic switch arm
on the red dot; the CTD wakes up and watches the pressure sensor value to start the acquisition.
Lowering the CTD in water starts the data acquisition and data storing. When the CTD returns to the
surface, wait 20 seconds and then switch it OFF by rotating the magnetic switch arm to the OFF
position. Move to the new profiling site, switch ON the CTD and lower it into water.
Notes
1) Each time a data acquisition is performed, a new data header is automatically generated.
2) Data acquisition ends whenever the CTD battery has run down or data memory is full or the
operator decides to stop it.

4.1.3. Ending the unattended data acquisitions

 Run the "ITERM" programme.
 Connect the CTD to the personal computer using the USB laboratory cable.
 The CTD start-up messages appear.
 Type the <CTRL-C> key until the Main menu appear.
 The unattended linear profile is ended and the CTD is working in the default verbose mode,
waiting for the operator's commands.
IDRONAUT – Brugherio (MB)
OCEAN SEVEN 304Plus CTD
33
12-2015