Memory Management; Memory Priming; Memory Status - idronaut Ocean Seven 304Plus Operator's Manual

SECTION THREE – COMMANDS
The operator can confirm or modify the above coefficients. Typing an <ENTER> key confirms the
shown coefficients, while, typing new values followed by an <ENTER> key modifies the previous
coefficients.
a = 0.0000987
b = 0.0011187
c = 1.659832e-13
Note
The conductivity sensor is usually very stable and precise. A check of any drift with time or calibration can be
performed by using a Standard Solution. A worldwide used Standard Solution for conductivity is the so called
"Copenhagen Water" and is supplied by I.A.P.S.O. - Standard Seawater Service. The certified value of
Chlorinity is 19.371 ppt, which corresponds to a Practical Salinity of 35.00 ppt. The temperature value is
determined in the salinity calculation. Nevertheless, since the temperature sensor is much less prone to drift than
the conductivity sensor, it is assumed that any variation, with respect to the certified value, is totally due to the
conductivity sensor.
The CTD must be carefully rinsed with distilled water, in order to remove any salt residue, and dried. These precautions
are necessary for not diluting or contaminating the Reference Solution. Transfer some Copenhagen Water into a beaker
and immerse the CTD into it. The value for conductivity and temperature can be read from the "Real-time calculated
data" mode. The conductivity value is supposed to be coincident or very close to the theoretical one.
3.4.

MEMORY MANAGEMENT

This group of commands allows the operator to check, query and show data stored in the CTD non-volatile
memory. Once invoked, the following message appears on the ITERM screen:
OCEAN SEVEN 304Plus - ID:304-0000000 {USR}[9.0_00-08/2012] 12:43:37.23 11-09-2012
Memory
[0]MainMenu
[1]Status
[2]Show-Stored
[3]Delete Cast
[4]Initialize
cmd>

3.4.1. Memory priming

The non-volatile data memory installed in the OCEAN SEVEN 304Plus CTD allows the storing of up
to about 60,000,000 data sets, each one being composed of the reading of: Conductivity, Temperature
and Pressure sensors plus the acquisition date and time. Data sets are automatically associated with
the header "cast" information that allows the operator to successively identify and retrieve portion of the
stored data. The CTD can store up to 1600 different casts or headers.

3.4.2. Memory Status

This command allows the operator to know the amount of CTD memory used at the moment of the
query.
Memory Status
Stored cast :
Stored dataset:
Memory sectors:
Memory bytes :
IDRONAUT – Brugherio (MB)
[ 1600]Max - [
[ 61793120]Max - [
[ 3862528]Max - [
[ 1977614336]Max - [
OCEAN SEVEN 304Plus CTD
0]Used
0]Used
202]Used
103424]Used
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12-2015