Online Dissolved Oxygen Analyzers
The dissolved oxygen meter is an instrument that continuously measures the concentration of dissolved oxygen in condensate and feed water used in boiler plants. Dissolved oxygen is a major cause of corrosion and deposits and should be monitored continuously.
Working Principle:
Vasthi Make Fluorescence method The dissolved oxygen sensor is based on the physics of specific substances and the fluorescence quenching principle. The blue light from the light-emitting diode (LED) illuminates the fluorescent substance on the inner surface of the fluorescent cap. The fluorescent substance on the inner surface is excited to emit red light. By detecting the phase difference between red and blue light, we can calculate the concentration of oxygen molecules. The temperature and pressure automatically compensate for the final output value.
FEATURES :
- No electrolyte, no polarization
- No need to consume oxygen, not affected by the flow rate
- Built-in temperature sensor, automatic temperature compensation
- Not subject to sulfide and other chemical substances interference
- Drift small, fast response, more accurate measurement
- maintenance-free, longer life cycle, the use of lower cost
- Fluorescent cap for simple replacement
- RS-485 interface, MODBUS-RTU protocol
| Model | VDO- 200 |
| Measuring principle | Fluorescence method |
| Range range | 0-20.00mq/L |
| Resolving power | 0.01mg/L, 0.1C |
| Accuracy | +5%F.S., +0.5C |
| Signal output | RS485(Modbus/RTU) |
| Working conditions | 0-45C, <0.2MPA |
| storage temperature | -5-65C |
| Installation method | 3/4 |
| Cable length | 5m, other lengths can be customized |
| Power consumption | <1W |
| power supply | 230V,50 Hz |
| Protection level for sensor | IP68 |
It is an industrial online dissolved oxygen (DO) analyzer used for continuous DO monitoring in water and wastewater systems.
It measures dissolved oxygen (mg/L or % saturation) to assess oxygen levels critical for biological treatment and water quality.
Ideal for wastewater treatment plants (ETP/STP), aquaculture, cooling water systems, industrial effluent monitoring, and environmental compliance.
Yes — it offers isolated analog outputs, RS-485/Modbus communication, and configurable alarm outputs for integration with SCADA and control systems.
Key features include automatic temperature compensation, high-stability DO sensors, low maintenance design, and reliable long-term performance for continuous monitoring.
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