Replacement Interval
The average lifetime of the DODISK is of 2 years. In case of deterioration of the DODISK or of difficulty on the processes of calibration, the DODISK will be to change.
1. Unscrew the stainless steel DODISK (1) from the sensor body with measurement electronics (3). When doing so, ensure that the optical window (2) of the sensor is not touched.
2. Remove the DODISK (Ref PF-CSO-C-00041 stainless steel version, PF-ACC-C-00045 Titanium version) from the opaque protective film and screw slowly onto the sensor body. When screwing on, ensure that the optical window of the sensor is not touched.
3. Rehydrate the membrane for a 12-hour period and recalibrate the sensor in 2 points (chapter 5.2.1)
Calibration Interval
An optical dissolved oxygen (DO) sensor measures the amount of oxygen dissolved in water using a luminescent (fluorescence-based) technology instead of electrochemical reactions.
It works by shining a specific wavelength of light onto a sensing layer coated with an oxygen-sensitive dye. The presence of oxygen affects the light emitted (either its intensity or decay time), and the sensor calculates the dissolved oxygen concentration based on this change.
Optical DO sensors are known for:
High stability and accuracy
Low maintenance (no electrolyte replacement)
Minimal drift over time
Fast response
Good performance in low-oxygen conditions
They are widely used in water treatment, aquaculture, environmental monitoring, and industrial process control.
Parameter | Specification |
|---|---|
Measure principle | Optical measure by luminescence |
Measure ranges | 0,00 to 20,00 mg/L |
Resolution | 0,01 |
Accuracy | ±0,1 mg/L (Range 0–100%) |
Response time | 90% of the value in less than 60 seconds |
Frequency of recommended measure | >5 s |
Water move | No necessary move |
Temperature compensation | Via NTC |
Stocking temperature | -10°C to +60°C |
Signal interface | Modbus RS-485 (standard) and SDI-12 (option) |
Sensor power-supply | 5 to 12 volts |
Consumption | Standby: 25 µA |
Sensor
Parameter | Specification |
|---|---|
Dimensions | Diameter: 25 mm; Length: 146 mm |
Weight | Stainless steel version: 450 g (sensor + 3 m cable) |
Material | Stainless steel 316L; New: body in Titanium |
Maximum pressure | 5 bars |
Connection | 9 armored connectors, polyurethane jacket, bare wires, or waterproof Fisher connector |
Protection | IP68 |
ISO 17289, ASTM D888
FAQ
Is the sensor operational in stagnant water, without water circulation?
Can the OPTOD sensor work with air, or if there is no water?
Why can I see a blue/green light on the active pad (DOdisk)?
Can the OPTOD sensor work in case of deterioration of the active membrane?
Dissolved oxygen measurement is very unstable, what should I do?
How long does the active tablet (DOdisk) last?
