Dissolved oxygen (ODO)

RBR compact instruments with “ODO” in the name, such as the RBRsolo⁴ ODO and the RBRduet⁴ D.ODO | deep, use the optical dissolved oxygen sensor (see Fig. 8). During deployments, always orient the sensor downwards to reduce debris collecting on the sensing foil and minimise direct sunlight. Store the sensor in the dedicated storage cap, included with the instrument. Rehydrate for five days before deployment. See RBR ODO sensor care and maintenance for more information.

Fig. 8. RBRsolo⁴ ODO | 2x: Optical dissolved oxygen sensor..

Parameter	Value
Measurement range	0-1000μmol/L
Calibrated range Concentration Saturation Temperature	0-500μmol/L 0-120% 1.5 to 30°C
Initial accuracy For \| fast For standard, \| slow	Maximum of ±8μmol/L or ±5% Maximum of ±2μmol/L or ±1.5%
Resolution For \| fast For standard For \| slow	<1μmol/L (saturation 0.4%) <0.5µmol/L (saturation 0.2%) <0.1μmol/L (saturation 0.04%)
Time constant	<1s \| fast, <8s standard, <30s \| slow

Parameter

Value

Measurement range

0-1000μmol/L

Calibrated range

Concentration
Saturation
Temperature

0-500μmol/L
0-120%
1.5 to 30°C

Initial accuracy

For | fast
For standard, | slow

Maximum of ±8μmol/L or ±5%
Maximum of ±2μmol/L or ±1.5%

Resolution

For | fast
For standard
For | slow

<1μmol/L (saturation 0.4%)
<0.5µmol/L (saturation 0.2%)
<0.1μmol/L (saturation 0.04%)

Time constant

<1s | fast, <8s standard, <30s | slow

Optical dissolved oxygen measurements require pressure correction for highest accuracy. Enter the known absolute pressure value manually in the Parameters table under the Calibration tab in Ruskin.