Maintenance: measuring membrane replacement, electrolyte replacement
Standard version 700 bar
Type: polarographic with Pt/Ir
cathode and Ag(99.99%) anode
Measurement range: 0... 50 ppm 0… 500% sat.
Accuracy: 0.1 ppm 1 % sat.
Resolution: 0.01 ppm 0.1% sat.
Polarization voltage: 650 mV DC
Response time: 3s @20°C
Max Pressure: 700 bar
Sensor body: titanium.
Compensation: automatic compensation of
pressure and thermal
variations.
Life: 2 years if intensively used to
perform continuous monitoring,
up to 4 years if used weekly to
perform daily profiling or
monitoring.
Calibration frequency: weekly.
Maintenance: measuring membrane
replacement,
electrolyte replacement.
1.15.6 The oxygen sensor maintenance-free version - 5 bar only
Type: polarographic with Pt/Ir cathode
and Ag(99.99%) anode
Measurement range: 0... 50 ppm 0… 500% sat.
Accuracy: 0.1 ppm 1 % sat.
Resolution: 0.01 ppm 0.1% sat.
Polarization voltage: 650 mV DC
Response time: 30 s (membrane @ 20°C)
Max Pressure: 5 bar
Sensor body: black plastic (PPS)
Compensation: automatic compensation of
pressure and thermal variations.
Life: 2 years if intensively used to
perform continuous monitoring,
up to 4 years if used weekly to
perform daily profiling or
monitoring.
Calibration frequency: weekly.
Maintenance: maintenance free.
1.15.6.1 Polarographic Oxygen sensor measurement priming
The OCEAN SEVEN 310 CTD allows the operator to obtain the oxygen data either expressed in ppm
or % Saturation. The formula which connects these two functions is given as by:
ppm = Saturation x Solubility / 100
The relevant formulae for the computation of saturation and solubility can be found in the below
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