C6.1 BLUE CAP DESCRIPTION
The external par of the Blue Cap Oxygen Optical Sensor is a
titanium support with a 11,7mm diameter, where at its centre
is placed a 3mm fiber optics well sealed to guarantee 700 bar
operations. The length of the support is about 44mm (without
the Blue replaceable membrane cap installed); two 2-12 Parker
O-rings seal the support onto the probe housing. The
measuring membrane cap is simply fitted inside the titanium
support till it stops and is provided with a friction system
(groovers) to prevent unwanted removal or
accidental loss. The membrane cap is made of blue
plastic to better shield the external light and is very
similar to the Idronaut pH watering cap. The only
difference is that a hole at its bottom allows the
factory installation of the glass window on its inside.
The black sensor spot which allow the oxygen
measurement is centrally placed on the outside of
the glass window. The other side of the optical fiber
remains indie the CTD housing and is fitted in a unique miniaturized transducer whose optics and
electronics transform the optical signal into RS485 output.
C6.2 SPECIFICATIONS
Measuring range: 0-250% O2 (0-45 mg/l)
Detection limit: 0.02% O2 (0.01 mg/l)
Resolution: 0.01% O2 (0.005 mg/l) at 1% O2
0.05% O2 (0.025 mg/l) at 100% O2
Accuracy: +-0.02% O2 (0.01 mg/l) at 1% O2
+-0.2% O2 (0.1 mg/l) at 100% O2
Temperature range: 0 to 50°C
Response time (t90) gas/water: sensor spot down to 5 s
No cross-sensitivity: pH 1-14, CH4; CO2, H2S, any ionic species
Cleaning procedures: 3 % H2O2, ethanol, soap solution
Storage time: >3 years in darkness at room temperature. A black cap is
provided to dark the blue cap membrane installed on the CTD.
Please remove it before deploying the CTD in water and before
carrying out the calibration.
Calibration: single point
Optical Isolation: the sensor spots are covered with a final black layer in order to
minimize influence of strong external illumination
C6.3 CONFIGURATION
Through the CTD configuration menu and the external sensor setup (CNES, command from the
CONFIGURATION MENU) it is possible to configure the optical dissolved oxygen sensor as below
described. The CTD propose by itself the correct parameters, they must be only confirmed using the
enter key.
Aux.#3 Select:(0)None,(1)miniSVS,(2)BlueCap-DO2
Aux.#3:0 enter new value< 2
After selecting the IDRONAUT Optical Dissolved Oxygen the working parameter are automatically
proposed. Please do not change them ! accept them using the ENTER key.
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