1. Product Introduction
What is the KWS series multi-parameter water quality sensor?
A multi-parameter water quality sensor is an integrated water quality monitoring device capable of real-time and continuous monitoring of multiple key parameters in water bodies simultaneously, such as dissolved oxygen, turbidity, pH, conductivity, chlorophyll, ammonia nitrogen, etc. It features an integrated structural design combined with waterproof connectors and an automatic cleaning system, addressing many of the limitations of traditional water quality monitoring methods.
The KWS multi-parameter water quality sensor can connect up to 6–8 different types of digital sensors simultaneously, significantly reducing deployment complexity and space requirements. Calibration data are stored directly inside each sensor, allowing plug-and-play replacement without recalibration. The built-in automatic cleaning device (such as a rotating cleaning brush) periodically removes contaminants from the sensor surface, effectively preventing biofouling and reducing manual maintenance frequency. This enables stable operation for several months in unattended environments.
2. KWS Series Multi-Parameter Water Quality Sensor Parameter Comparison Table
| Model | KWS-800 | KWS-850 | Handheld |
| DO Range | 0–20 mg/L | 0–20 mg/L | 0–20 mg/L |
| DO Accuracy | <1% or ±0.3 mg/L | ±2% | <1% |
| DO Resolution | — | 0.01 mg/L | 0.01 mg/L |
| COD Range | / | 0–200 or 500 mg/L 0–100 or 200 NTU (Turbidity) | / |
| COD Accuracy | / | ±5% (COD) ±5% (Turbidity) | / |
| COD Resolution | / | 0.1 mg/L / 0.1 NTU | / |
| pH Range | 0–14 pH | 0–14 pH | 0–14 pH |
| pH Accuracy | ±0.02 pH | ±0.1 pH | ±0.1 pH |
| pH Resolution | — | 0.01 pH | 0.01 pH |
| ORP Range | -1999 to 1999 mV | -1500 to +1500 mV | -999 to 999 mV |
| ORP Accuracy | ±20 mV | ±6 mV | ±20 mV |
| ORP Resolution | — | 1 mV | 1 mV |
| Turbidity Range | 0.1–1000 NTU | 0–200 / 1000 NTU | 0.1–1000 NTU |
| Turbidity Accuracy | <5% or 0.3 NTU | ±3% or ±2 NTU (200 NTU) / ±5% or ±3 NTU (1000 NTU) | <5% or 0.3 NTU |
| Turbidity Resolution | — | 0.1 NTU | 0.1 NTU |
| Conductivity / Salinity Range | 0–5000 µS/cm or up to 100 mS/cm0–2.5 ppt or 0–80 ppt | 0–5000 µS/cm or up to 200 mS/cm 0–70 PSU | 0.01–5 mS/cm or up to 100 mS/cm 0–2.5 ppt or 0–80 ppt |
| Conductivity / Salinity Accuracy | — | ±1.5% | <1% or 0.01 mS/cm / ±0.05 ppt or ±1 ppt |
| Conductivity / Salinity Resolution | — | 1 µS/cm (5000 µS/cm) 0.1 mS/cm (200 mS/cm)0.1 PSU | — |
| Chlorophyll Range | 0–500 µg/L | — | 0–400 µg/L or 0–100 RFU |
| Chlorophyll Accuracy | <5% or 0.5 µg/L | — | 0.1 µg/L or 0.1% RFU |
| Chlorophyll Resolution | — | — | — |
| Ammonia Nitrogen Range | — | 0–100 mg/L or 1000 mg/L | — |
| Ammonia Nitrogen Accuracy | — | ±10% or ±1 mg/L | — |
| Ammonia Nitrogen Resolution | — | 0.01 mg/L or 0.1 mg/L | — |
| Oil in Water Range | 0–150 ppm | — | 0–50 ppm or 0–0.40 FLU |
| Oil in Water Linearity | R² > 0.999 | — | R² > 0.999 |
| Oil in Water Resolution | — | — | 0.01 ppm |
| Blue-Green Algae Range | 0–300,000 cells/mL | — | 0–200,000 cells/mL |
| Linearity / Resolution | R² > 0.999 | — | 300 cells/mL / 1 cell/mL |
| Operating Temperature | 0–50°C | -5–40°C | 0–50°C |
| Operating Pressure | 40 m water depth | — | 50–115 kPa |
| Protection Rating | IP68 | IP68 | IP68 (Probe) / IP67 (Handheld Meter) |
| Power Supply | 12–24 V DC | 12 V DC | 5–12 V DC |
| Output Interface | RS485 Modbus | ||
| Automatic Cleaning | Yes, cleaning interval adjustable | No | |
3. Explanation of Core Parameters
| Parameter | Explanation |
| Protection Rating | IP68 indicates complete dust protection and the ability to operate underwater for extended periods at a certain depth, ensuring stable performance in rivers, lakes, and marine environments. |
| Automatic Cleaning | Mechanical cleaning (such as a rotating brush) removes deposits from the sensor surface, preventing biofouling or contamination from affecting the accuracy of optical and electrochemical sensors. This reduces manual maintenance and is suitable for long-term online monitoring applications. |
The meanings of individual water quality parameters are not explained here. For further information, please refer to Wikipedia.
4. Step-by-Step Selection Process
Step 1: Define Monitoring Requirements and Parameters
● First, determine the water quality parameters to be monitored
● For example: aquaculture focuses on dissolved oxygen, pH, and ammonia nitrogen; industrial wastewater treatment requires monitoring of pH, COD, and conductivity; marine ecological monitoring typically includes dissolved oxygen, salinity, and chlorophyll.
Step 2: Determine Output Requirements
● Confirm the required communication protocol or signal type (e.g., RS485 interface, 4–20 mA analog output)
Step 3: Identify Application Scenario and Environmental Conditions
● Water depth: select pressure-resistant models for lakes and river monitoring; shallow-water environments (such as ponds) have lower depth requirements and allow more flexible selection.
● Temperature conditions: if ambient temperatures drop below 0°C in winter, verify that the sensor can operate reliably at low temperatures.
Step 4: Evaluate Installation Compatibility
● Download the product manual and determine installation feasibility based on product dimensions and mounting methods.
Step 5: Consult Professionals
● If you are still unsure about the selection, consult the KACISE professional technical team. They will provide targeted recommendations based on your specific requirements and site conditions.
5. Summary
When selecting a multi-parameter water quality sensor, it is essential to first define monitoring parameters and application scenarios, then choose the appropriate model based on accuracy, range, and functional requirements. Whether you are a water quality monitoring agency, an environmental protection enterprise, or an aquaculture practitioner, selecting a suitable multi-parameter water quality sensor can significantly improve monitoring efficiency and data accuracy.
If you are still uncertain about model selection or have special parameter customization requirements, please feel free to contact us. We will provide one-on-one selection consultation and customized solutions.
If you are unsure which model to choose, feel free to contact us with your application details for technical support.
