C7 CONDUCTIVITY SENSOR WITH INTEGRATED UV-LED ANTIFOULING
A UV-LED (Ultraviolet 250 ÷ 300 nm @ 500 µW, Light-Emitting Diode) is integrated into the
conductivity sensor quartz cell (patent pending). The UV-LED sterilizes the early growth of
biofouling, thus eliminating environmental drift in the conductivity sensor. This innovative
solution does not break the European rules, which do not permit the use of Tributyltin (TBT), a
very toxic and poisoning (carcinogenic) substance which has been banned by the international
government agencies, mandatory to protect any recessed conductivity cell, which present a very
small diameter and may get contaminated or even clogged. The UV-LED is excited, for a
configurable amount of seconds, when the CTD wakes up.
C7.1 CONFIGURATION
Through the CTD set-up, it is possible to configure the UV-LED antifouling sterilization time in
seconds. This time is spent by the probe during the wake-up to sterilize the conductivity sensor.
The sterilization continues (as it does not affect the conductivity measurements) until the CTD
switches off by itself and configures the next data acquisition time according to the above rules.
Configuration of the UV-LED sterilization time-out in seconds is done by modifying the
conductivity sensor configuration:
The following parameters can be configured by means of the “Modify” command by selecting
the CONDUCTIVITY sensor from the above list:
UV-Led installed ?:No type [Y]es or [N]o < y
UV-Led time [ms]:0 enter new value< 1000
C8 C/T FORCED FLOW PUMP
The OCEAN SEVEN 310 Conductivity and Temperature sensor
pair can be optionally pumped to guarantee a constant sample flow
through the CT sensors.
The pump rotation speed is factory adjusted to 1000 RPM which
allows 10 ml/s flow ratio. This setting guarantees that the sample is
renewed every 200ms independently of the OS310 probe
deployment speed (profiling speed). If required, the pump rotation
speed can be factory adjusted up to 2000 RPM.
C8.1 MAINTENANCE
At the end of each profile, carefully wash with fresh or possibly
distilled water the CT sensor pair and the pump by flushing from
the pump output port through the pipe until the water leaks out of the CT sensor pair upper hole.
In case the OCEAN SEVEN 310 is not used for long periods of time, the water remaining inside the
CT sensor pair can be removed by simply reverting the probe up and down. In order to clean the
conductivity quartz cell, dismount the sensor protection ring and remove the black pipe adapter
(see below instructions).
C8.2 INSTRUCTIONS ON HOW TO REMOVE THE CT SENSOR
PUMP PIPE ADAPTER
To dismount the CT sensor pump pipe adapter, remove the four titanium
nuts and washers and the plastic screw which keeps the black pipe adapter
in position.
Remove the lower protection ring.
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