Probe Description; Sampling Modes; Real Time Communication - idronaut Ocean Seven 304Plus Operator's Manual

SECTION ONE – SYSTEM DESCRIPTION
1.

PROBE DESCRIPTION

The OCEAN SEVEN 304Plus CTD completes
the line of high
IDRONAUT OCEAN SEVEN CTDs, fulfilling
the demand of a high performance CTD with
very small diameter and very low power
consumption.
This CTD can be easily integrated/adapted to third-party systems like floating profilers and/or
oceanographic moorings, ROVs and AUVs. IDRONAUT prides itself on the design of its full
ocean depth, pump-free, low-maintenance sensors. Central to which is their high accuracy
seven-platinum-ring quartz conductivity cell (patented) which can be cleaned in the field
without the need for re-calibration. This unique quartz cell employs a large diameter (8 mm)
and a short length (46mm) to guarantee self-flushing.
The OS304Plus does not require pumps or any other external device to flush the sensors,
which minimizes its power consumption and allows the use in Arctic and Antarctica. The
OS304Plus CTD standard interface is RS232C; other optional interfaces are: TTL, RS485 and
wireless Bluetooth®. The RS485 interface overcomes the RS232C limitation (max 200m cable).
The OS304Plus can communicate at speeds up to 115k2 bps, thus minimizing data uploading
time. The OS304Plus can be manufactured with the following housings: AISI 316 stainless
steel/POM (plastic), whole POM, composite titanium/POM or whole titanium and can be
deployed to depths of 1000m, 2000m, 4000m or 7000m respectively.
1.1.

SAMPLING MODES

User selectable sampling/operating modes include:
Continuous:
Pressure:
Timed:
Conditional:
Burst:
1.2.

REAL TIME COMMUNICATION

The OCEAN SEVEN 304Plus CTD communicates with a computer via a standard RS232C interface.
Real-time data can be acquired by means of the REDAS-5, µREDAS or ITERM Windows IDRONAUT
software. The optional RS485 interface overcomes the limitation of the RS232C cable maximum length
(200 m) and allows the CTD to transmit data through distances up to 1000 m. The communication
speed is user selectable among: 9600, 19200, 38400, 57600 and 115200 bps. The default speed is 38K4.
Connection type
USB
RS232C / RS485
RS232C
RS485
IDRONAUT – Brugherio (MB)
quality and accuracy
Data is sampled at configurable sampling rates starting from 0.1 Hz to 6 Hz.
Sampling continues until interrupted. Multiple cycles can be possible by
switching the CTD ON and OFF.
Data is sampled at regular pressure intervals. Multiple profiles can be
obtained by switching the CTD ON and OFF.
CTD collects a series of samples and then sleeps for the configured time interval
before waking up again and repeating the acquisitions. Time interval can be
configured between 5s and 1 day. Battery power is conserved while the CTD is in
sleep mode. This data acquisition method is ideal for long-term monitoring.
Data acquisition is started and continues while the reading from a selected sensor is
above a threshold value. Monitoring of the selected sensor threshold value can be
configured to occur at intervals: between 5s and 1day.
8 Hz measurements can be performed at configured time intervals between 5s and 1
day. Battery power is conserved by switching off the CTD between bursts.
Max cable length
OCEAN SEVEN 304Plus CTD
Features:

Up to 6Hz CTD simultaneous sampling.

Very low power consumption.

Expandable: oxygen, turbidity and other sensor
interfaces, available upon request.

Large memory (2GBytes) 60.000.000 data sets.

High-speed data uploading.
4 m
10 m
200 m
1000 m
Max. transfer rate
115200 bps
115200 bps
38400 bps
38400 bps
12-2015
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