Benefits of Using a Polarographic dissolved oxygen sensor in Water Quality Monitoring

Water quality monitoring is a crucial aspect of environmental management, as it helps to ensure the safety and health of aquatic ecosystems. One key parameter that is often monitored in water quality assessments is dissolved oxygen levels. Dissolved oxygen is essential for the survival of aquatic organisms, as it is necessary for respiration. Monitoring dissolved oxygen levels can provide valuable insights into the health of a water body and help identify potential sources of pollution.

One of the most common methods used to measure dissolved oxygen levels is the polarographic dissolved oxygen sensor. This sensor works on the principle of polarography, which involves measuring the current generated by the reduction of oxygen at a polarized electrode. The sensor consists of a cathode and an anode, separated by a semi-permeable membrane that allows oxygen to diffuse into the sensor.

Measuring Method N,N-Diethyl-1,4-phenylenediamine (DPD) spectrophotometry
Model CLA-7122 CLA-7222 CLA-7123 CLA-7223
Inlet water channel Single channel Dual channel Single channel Dual channel 
Measurement range Total Chlorine : (0.0 ~ 2.0)mg/L ,calculated as Cl2 ; Total Chlorine : (0.5 ~10.0)mg/L ,calculated as Cl2 ;
Accuracy Free chlorine: ±10% or 0.05mg/L (whichever is greater), calculated as Cl2; Total chlorine: ±10% or 0.05mg/L (whichever is greater), calculated as Cl2 Free chlorine: ±10% or 0.25mg/L (whichever is greater), calculated as Cl2; Total chlorine: ±10% or 0.25mg/L (whichever is greater), calculated as Cl2
Measurement cycle Free Chlorine≤2.5min
Sampling interval The interval (1~999) min can be set to any value
Maintenance cycle Recommended once a month (see maintenance chapter)
Environmental Ventilated and dry room without strong vibration; Suggested room temperature: (15 ~ 28)℃; relative humidity: ≤85% (no condensation).
Sample water flow (200-400) mL/min
inlet water pressure (0.1-0.3) bar
Inlet water temperature range (0-40)℃
Power supply AC (100-240)V; 50/60Hz
Consumption 120W
Power connection 3-core power cord with plug is connected to the mains socket with ground wire
Data output RS232/RS485/(4~20)mA
Dimension size H*W*D:(800*400*200)mm

One of the key benefits of using a polarographic dissolved oxygen sensor is its high accuracy and precision. The sensor can provide real-time measurements of dissolved oxygen levels with a high degree of accuracy, allowing for more reliable and consistent monitoring of water quality. This is particularly important in sensitive ecosystems where even small changes in dissolved oxygen levels can have a significant impact on aquatic organisms.


In addition to its accuracy, the polarographic dissolved oxygen sensor is also highly sensitive to changes in dissolved oxygen levels. This sensitivity allows for the detection of subtle changes in water quality, making it easier to identify potential sources of pollution or other environmental stressors. By providing continuous monitoring of dissolved oxygen levels, the sensor can help to quickly detect and respond to changes in water quality, minimizing the impact on aquatic ecosystems.


Another benefit of using a polarographic dissolved oxygen sensor is its durability and reliability. The sensor is designed to withstand harsh environmental conditions, making it suitable for long-term monitoring in a variety of aquatic environments. Its robust construction ensures that the sensor can continue to provide accurate measurements even in challenging conditions, such as high turbidity or extreme temperatures.

Furthermore, the polarographic dissolved oxygen sensor is easy to use and maintain, making it a cost-effective option for water quality monitoring. The sensor requires minimal calibration and maintenance, reducing the need for frequent adjustments or replacements. This ease of use makes the sensor ideal for both professional monitoring programs and citizen science initiatives, allowing for widespread monitoring of water quality.

ROC-2315 ro controller instruction (220V)
Model ROC-2315
Single detection Dry Contact input Raw water no water protection
(six channels) Low-pressure protection
  High-pressure protection
  Pure water tank high level
  External control mode signal
  Running reset
Control port Dry Contact output Raw water pump SPST-NO low capacity : AC220V/3A Max ;AC110V/5A Max
(five channels) Inlet valve  
  High pressure pump  
  Flush valve  
  Conductivity over-limit drainge valve  
Measurement detection point Product water conductivity and with Automatic Temperature compensation (0~50)℃
Measurement range Conductivity : 0.1~200μS/cm/1~2000μS/cm/10~999μS/cm (with different conductivity sensor )
Product water temp. : 0~50℃
Accuracy 1.5 level
Power supply AC220V (±10%) , 50/60Hz
Working environment Temperature:(0~50)℃ ;
Relative Humidity :≤85%RH (no condensation )
Dimension 96×96×130mm( height ×width×depth)
Hole size 91×91mm(height ×width)
Installation Panel mounted ,fast installtion
Certification CE

Overall, the polarographic dissolved oxygen sensor offers a range of benefits for water quality monitoring. Its high accuracy, sensitivity, durability, and ease of use make it a valuable tool for assessing the health of aquatic ecosystems and identifying potential sources of pollution. By providing continuous monitoring of dissolved oxygen levels, the sensor can help to protect and preserve our water resources for future generations.

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