• PRESSURE SENSOR:
  A pressure sensor inside the measuring chamber accurately monitors the pressure inlet and acts as an accurate flowmeter.
• 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 ohm 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 (not provided)
• INTERFACE:
  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.

The OS314 multiparameter CTD can be equipped with the following sensors to measure:

(1) Differential pH preamplifier, 10¹³ ÷ 10¹⁴ ohm input impedance.
(2) A special FAST membrane, with response time 1s, is available upon request.
(3) Extended ranges available upon request.
Derived parameters such as: Salinity, Water Density, Oxygen ppm are obtained using the algorithms described in the UNESCO “Technical papers in marine science no.44 – Algorithms for computation of fundamental properties of sea water”.

(1) Chlorophyll a, Phycocyanin, Phycoerythrin for algae monitoring; Rhodamine WT or Fluorescein for dye tracing applications;
Nephelometer for turbidity monitoring.
(2) Chlorophyll a, Blue green algae, Rhodamine, Fluorescein, Turbidity, CDOM, Crude oil.