Dissolved Oxygen Probe AT-SB-PROBE-DO-P-C1
Datasheet
1. Introduction
SENSBLUE RS-485 Dissolved Oxygen Probe AT-SB-PROBEDO-P is an integrated online fluorescence dissolved oxygen sensor designed based on the quenching principle of excited fluorescence by specific substances in physics. When the excitation light shines on the fluorescent substance on the surface of the fluorescent membrane head, the substance becomes excited and emits fluorescence. The extinguishing time of this fluorescence is affected by the concentration of oxygen molecules on the surface of the fluorescent membrane head. The oxygen concentration can be calculated by detecting the phase difference between the fluorescence and the excitation light and comparing it with the internal calibration curve. The final value is then output after temperature and salinity compensation.
2. Features
- No electrolyte is required and it will not be polarized.
- No oxygen consumption; not affected by flow rate.
- Built‑in temperature sensor, automatic temperature compensation.
- Built‑in salinity compensation, flexible parameter settings.
- Free from interference by chemicals such as sulfides.
- Small drift, rapid reaction, for more accurate measurement.
- Long service cycle, lower cost of use.
- Simple replacement of fluorescent cap.RS‑485 interface, Modbus/RTU protocol.
- Low power consumption and anti‑interference
3. Technical Specifications
| Model | Pro | Ultra |
|---|---|---|
| Case material | POM, ABS/PC alloy, 316L stainless steel | 316L Titanium Alloy |
| Measurement principle | Fluorescence method | |
| Range | 0～20.00 mg/L (0～200% saturation, 25℃) | |
| Resolution | 0.01mg/L, 0.1℃ | |
| Accuracy | ±2%, ±0.3℃ | ±3% |
| Response time (T90) | ＜30s | ＜60s |
| Minimum detection limit | 0.08mg/L | |
| Calibration method | Two-point calibration | |
| Temperature compensation | Automatic temperature compensation (Pt1000) | |
| Output method | RS-485 (Modbus RTU) | |
| Storage temperature | -5~65℃ | |
| Working conditions | 0～50℃, ≤0.2MPa | |
| Installation method | Submersible installation, 3/4 NPT | Max Depth 30m |
| Power consumption | 10.1W@12V | |
| Power supply | 12~24V DC | |
| Protection level | IP68 | |
| Life of fluorescent membrane head | 1 year (under normal use) | |
| Cable length | 10 meters, other lengths can be customized | |
| Max water depth | 30m | |
4. Dimensions and Wiring
| Pinouts | |
|---|---|
| 1 - Pin +12V DC | 4 - RS485 B- |
| 2 - GND | 5 – NA |
| 3 - RS485 A+ | 6 - NA |
| 7 - NA | |
5. Installation
Install
The sensor needs to be installed below the liquid level. The installation and use should avoid any collisions or scraping against the surface of the fluorescent film head. The fluorescent film head should also be kept from contacting the bottom sediment. Remove the rubber cover when in use.
6. Maintenance
6.1 Use and maintenance
a) Maintenance schedule
Different from dissolved‑oxygen probe technology based on the electrochemical principle, the fluorescence dissolved‑oxygen probe does not consume oxygen and does not need to be cleaned frequently (except when used in viscous liquids).
| Maintenance Task | Recommended Maintenance Frequency |
| Cleaning sensor | Wash every 30 days |
| Check for damage to sensors and caps | Check every 30 days |
| Replace the fluorescent cap | Replace it once a year |
| Calibrate (if required by the competent authority) | According to the maintenance schedule required by the competent department |