Overview of Dissolved Oxygen Sensor COS61D
The dissolved oxygen sensor COS61D is an online analytical instrument used for industrial process monitoring, widely applied in fields such as wastewater treatment, aquaculture, biopharmaceuticals, and chemicals. Its core adopts membrane-type electrochemical or optical principles and can continuously measure the dissolved oxygen concentration in water. Based on the official Chinese manual, this article systematically organizes its technical parameters, installation, calibration, and maintenance points.
Technical Parameters and Specifications
The following table lists the main performance indicators of the COS61D for selection and procurement reference.
| Parameter | Specification |
|---|---|
| Measurement range | 0~20 mg/L (or 0~200% saturation) |
| Accuracy | ±1% FS |
| Response time | T90 ≤ 60 seconds |
| Operating temperature | 0~50°C |
| Pressure resistance | ≤ 10 bar |
| Output signal | 4~20 mA / Modbus RTU |
| Power supply | 24 VDC |
| Protection rating | IP68 |
Installation Guide
Installation Location Selection
- Avoid installation in areas with bubbles, turbulence, or stagnant water to ensure representative measurement.
- The sensor membrane should face downward or be horizontal to prevent bubbles from adhering.
- Maintain a distance of at least 10 cm from walls or the bottom of the tank.
Installation Steps
- Shut off the pipeline or container, depressurize, and drain the medium.
- Screw the sensor into the mounting bracket or flange, ensuring the sealing ring is intact.
- Connect the cable, paying attention to grounding the shielding layer to avoid electromagnetic interference.
- After power-on, check whether the output signal is normal.
Calibration and Maintenance
Calibration Methods
- Air calibration: Place the sensor in saturated humid air and perform a single-point calibration.
- Zero-point calibration: Use oxygen-free water (such as sodium sulfite solution) for zero-point calibration.
- The calibration cycle is recommended every 1~3 months, depending on the working conditions.
Daily Maintenance
- Regularly check whether the membrane is damaged or contaminated, and replace it if necessary.
- Clean the sensor surface with a soft cloth and clean water, avoiding scratches.
- The electrolyte needs to be replenished or replaced according to the manual's cycle.
Common Problems and Solutions
| Symptom | Possible Cause | Solution |
|---|---|---|
| Reading too high | Membrane contamination or bubbles | Clean the membrane and remove bubbles |
| Reading too low | Electrolyte depleted or aged | Replace the electrolyte or membrane |
| No signal | Cable break or abnormal power supply | Check the wiring and power supply |
Download the Chinese Manual
Click the link below to obtain the complete COS61D Chinese manual PDF file, including detailed wiring diagrams, dimension drawings, and fault code tables.