Dissolved Oxygen Analyzer
DO300-C1

Dissolved Oxygen Analyzer

The DO300-C Dissolved Oxygen Analyzer, when paired with the DO300-S Dissolved Oxygen Sensor, provides a high-performance and reliable solution for continuous dissolved oxygen (DO) measurement in various water and industrial applications.
The DO300-S sensor operates using advanced luminescent optical technology, eliminating the need for membranes and electrolyte solutions. This ensures low maintenance, high durability, and stable long-term performance. The sensor does not consume oxygen during measurement, making it independent of flow rate and suitable for dynamic process conditions. It is designed with robust materials (POM and SS316L) and offers excellent resistance to electrical and chemical interference, ensuring accurate and reliable readings even in harsh environments.
The DO300-C analyzer processes the data received from the sensor and provides real-time monitoring with a clear multi-parameter display, including dissolved oxygen, temperature, and current values. It supports both manual and automatic temperature compensation, multiple calibration options, and configurable alarm functions with relay outputs. The analyzer also offers flexible output options, including 4–20 mA analog signals and RS485 digital communication using the MODBUS protocol, enabling seamless integration with industrial control systems.

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  • High measurement accuracy (±1% FS) Both provide precise dissolved oxygen readings.
  • RS485 communication with MODBUS protocol Easy integration with PLC, SCADA, and industrial systems.
  • Temperature measurement & compensation support Sensor has built-in temperature sensor + analyzer provides compensation improves accuracy.
  • Wide measurement range Typically 0–20 mg/L and % saturation suitable for various conditions.
  • Fast response time Quickly detects changes in dissolved oxygen levels.
  • Digital signal output ensures accurate and noise-resistant data transmission.

  • Water and wastewater treatment plants
  • Environmental monitoring
  • Aqua culture / fish farming
  • Industrial process monitoring
  • Drinking water systems
  • Laboratories and research
  • Water and wastewater treatment plants
  • Environmental monitoring
  • Aquaculture / fish farming
  • Industrial process monitoring
  • Drinking water systems
  • Laboratories and research
  • Measuring range : 0-20mg/L; 0-100%; 
  • Measuring unit : mg/L, % 
  • Resolution: 0.01mg/L; 0.1% 
  • Relative accuracy: ±1% F.S
  • Temperature: 0~50.0°C 
  • Temperature resolution : 0.1°C 
  • Temperature accuracy : ±0.3°C 
  • Temperature compensation : 0~60.0°C 
  • Temperature compensation : Manual or automatic 
  • Electrode residual signal : <1‰
  • Response time : 25°C<60S; 35°C<30S (To attain 90%) 
  • Stability: At constant pressure and temperature, the weekly drift<2%F•S;
  • Current output: Two:4~20mA,20~4mA,0~20mA(load resistance<750Ω)
  • Input Signal: RS485 (Digital)
  • Communication output : RS485 MODBUS RTU
  • Relay control set-points: Two:3A 250VAC,3A 30VDC 
  • Optional power supply: 85~265VAC,9~36VDC, power consumption≤3W
  • Working conditions: No strong magnetic field interference except the geomagnetic field. 
  • Working temperature : -10~60°C 
  • Relative humidity : ≤90% 
  • Waterproof rating : IP65
  • Weight: 0.6kg 
  • Dimensions: 98×98×130mm
  • Installation opening size: 93×93mm
  • Installation methods : Panel & wall mounting
  • Power Supply:9 ~ 36 V DC
  • Output Signal:RS485 (MODBUS RTU Protocol)
  • Measurement Principle:Optical Luminescent Method
  • Material:POM + SS316L
  • Protection Grade:IP68
  • Measurement Range:0–20 mg/L, 0–200% saturation
  • Accuracy:±1% Full Scale
  • Pressure Range:≤ 0.1 MPa
  • Temperature Sensor:NTC10K
  • Temperature Range:0–50°C
  • Calibration Method:Air Calibration and Anaerobic Water Calibration
  • Connection Type:4-wire shielded cable / detachable aviation connector
  • Cable Length:Standard 10 meters (extendable up to 100 meters)
  • Thread Size:G3/4
  • Application:Typical applications: Rivers, lakes, drinking water, environmental monitoring, etc
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