The OS314 On-Line module is housed in a sealed POM cylinder provided with a transparent acrylic flow cell which is easily removed for sensor cleaning, calibration and maintenance. The sample volume of the measuring chamber is only 420 ml, which ensures a very fast response time. The measurement sensors installed in the On-Line module are manufactured by IDRONAUT. The On-Line module is controlled by an advanced miniaturized and very low power electronics that store measurements in non-volatile memory or transmit them in real-time at sampling rate of up to 28 Hz. The On-Line module can be directly connected to a data logger or personal computer by means of a wired or wireless interface. Optional interfaces allow the connection of external fluorometer and turbidity meter and a remote thermometer.
◊ PRESSURE SENSOR
A pressure sensor inside the measuring chamber accurately monitors the pressure inlet and acts as an accurate flowmeter.
◊ TWO ACCURATE TEMPERATURE SENSORS
Each sensor features a very fast Pt100 platinum resistance thermometer with negligible self-heating effect. The main thermometer is located inside the measuring chamber. The optional remote sensor for measurement of the actual sea temperature at the ship's intake can be located up to 50m from the main unit.
◊ CONDUCTIVITY SENSOR
The high accuracy seven-platinum-ring quartz conductivity cell (patented) can be cleaned in the field without the need for re-calibration. This unique quartz cell employs a large diameter (8mm) and a short length (46mm) to guarantee self-flushing and no clogging after long-term deployment even in biologically active waters. Furthermore, an optional UV LED (280 nm), integrated into the conductivity cell, sterilizes the sample under measurement, thus avoiding the early growth of biofouling inside the quartz measuring cell.
◊ OPTICAL DISSOLVED OXYGEN SENSOR
Optical dissolved oxygen sensor works according to the principle of dynamic fluorescence and it is based on REDFLASH technology and on a unique oxygen-sensitive REDFLASH dyes. The REDFLASH technology impresses by its almost no drift, low power consumption, low cross-sensitivity and fast response time.
◊ pH GLASS SENSOR and SOLID GEL REFERENCE ELECTRODE
High-pressure, low impedance glass membrane pH electrode in conjunction with a unique KCl or NaCl gel double junction reference electrode and a differential pH preamplifier, 1013 ÷ 1014 Ω input impedance.
◊ FLUOROMETER INTERFACE (external installation)
The system can interface to a remote Fluorometer installed in an external measuring flow-through cell.
◊ TURBIDITY METER INTERFACE (external installation)
The system can interface to a remote Turbidity Meter installed in an external measuring flow-through cell.
The standard RS232C or the optional RS485 serial interface allows the capture of data in real time by any customer data logger.
An optional wireless interface: Wi-Fi, Bluetooth can be installed too.
◊ REAL-TIME ACQUISITION SOFTWARE - REDAS5
REDAS5 software, through a simplified and friendly operator interface, allows taking full control of the OS314 On-Line Module acquisitions. REDAS5 shows the acquired data graphically and numerically. If a GPS is connected to the PC running the REDAS5, acquired data is automatically associated with the geographical coordinates acquired from GPS.
◊ DATA STORAGE
The OS314 is equipped with a 4-Gbyte SD memory card, which allows storing of about 60,000,000 data sets each one being composed of the reading of all the installed sensors plus the acquisition date and time. The OS314 communicates at a speed up to 115k2 bps, thus keeping data uploading time to a minimum.
POM body and Acrylic transparent flow cell
Max. cable length [m]
Weight in air [kg]
Year of initial development
Data display on dedicated hardware
Display of analogue data
Method of first recording
Pressure, temperature and conductivity sensor
Accuracy of temperature measurement
Accuracy of conductivity measurement
Accuracy of pressure sensor
Max. conductivity [S/m]
Max. temperature [°C]
Min. temperature [°C]
Resolution of pressure [% FS]
Resolution of conductivity [10^-3 S/m]
Resolution of temperature [°C]
Type of conductivity sensor
7-rings quartz cell
Type of pressure sensor
Type of temperature sensor
CTD Probe controller
Re-computation with raw data
Raw data editing
Recording with third party software
WTERM and REDAS-5
Max. depth [m]
Max. pressure [bar]
Operating temperature: min. [°C]
Operating temperature: max. [°C]
Data and connectivity
Dedicated sub-surface data logger
Dedicated surface data logger
Direct data reading
External recorder required
Internal Memory [MB]
Max. number of samples for self-recording [10^3]
Telemetry link to remote location
Type of internal memory
Max. operating power [V]
Min. operating power [V]
Description of additional sensors
Dissolved Oxygen, pH, Redox (ORP), Turbidity meter, Fluorometers, remote temperature
No. of additional sensors
Conductivity; Temperature; Pressure,
Communication protocol: plain ASCII message protocol, Flow cell volume: 420 ml