1. Product Introduction
1.1 What is an Ammonia Nitrogen Sensor?
The ammonia nitrogen sensor is an intelligent monitoring device capable of real-time and accurate detection of ammonia nitrogen concentration in water. It uses advanced ion-selective electrode technology as its core and integrates multiple compensation functions, effectively addressing many limitations of traditional ammonia nitrogen monitoring methods.
In the past, traditional ammonia nitrogen analyzers often relied on large amounts of chemical reagents, which not only caused environmental pollution but also increased monitoring costs. In addition, conventional devices were complex to operate, required professional maintenance, and data acquisition had a certain delay, making it difficult to achieve real-time water quality monitoring. The KWS series ammonia nitrogen sensors completely change this scenario.
1.2 Advantages of KWS Series Ammonia Nitrogen Sensors
The KWS series sensors are reagent-free and environmentally friendly, preventing secondary pollution from reagents and significantly reducing user costs. They enable real-time online monitoring, allowing users to track ammonia nitrogen concentration changes and promptly detect water quality anomalies.
Additionally, the sensors feature automatic compensation for pH, temperature, and optional potassium ions, ensuring accurate measurements under various water quality conditions. The sensors use RS485 output and support the Modbus protocol, enabling easy connection with PLCs, DCS, industrial control computers, and other third-party devices, simplifying data acquisition and system integration, and reducing maintenance efforts.
2. KWS Series Ammonia Nitrogen Sensor Parameter Comparison
| Model | KWS-200A | KWS-201 | KWS-250 | KWS-290 |
| Measurement Range | NH4-N:0~1000 mg/L, pH: 4~10 | NH4-N: 0~100mg/L; NH4-N: 0~1000mg/L, pH: 4~10 | NH4-N:0~10mg/L; NH4-N:0~100mg/L; NH4-N: 0~1000mg/L | NH3-N: 0~100 mg/L; NH3-N: 0~1000 mg/L; NH4-N: 0~100 mg/L; NH4-N: 0~1000 mg/L, pH: 0~14, K+ (optional): 0~1000 mg/L |
| Resolution | NH4-N: 0.1mg/L, pH: 0.01 | NH4-N: 0.01 mg/L; pH: 0.01 | NH4-N:0.01mg/L; NH4-N:0.01mg/L; NH4-N: 0.1 mg/L | NH3-N:0.1 mg/L; NH4-N: 0.1 mg/L; pH: 0.1 |
| Accuracy | NH4-N: ±5%; pH: ±0.1 | NH4-N: ±10%/±0.5 mg/L; pH: ±0.1 | NH4-N: ±10%/±1mg/L; NH4-N: ±10%/±1mg/L; NH4-N: ±10% | ±5% (0~100mg/L); ±10% (0~1000 mg/L) |
| Temperature Compensation | Automatic | Automatic | Automatic | Automatic |
| pH Compensation | Automatic | Automatic | Automatic | Automatic |
| Temperature Range | 0~50°C | 0~50°C | 0~40°C | 0~60°C |
| Output | RS485 Modbus | RS485 Modbus | RS485 Modbus | RS485 Modbus |
| Power Supply | 8~26 VDC | 9~24 VDC | 12~24 VDC | 12~24 VDC |
| Protection Rating | IP68 | IP68 | IP68 | IP68 |
| Installation Method | Immersion, thread NPT3/4 | Immersion, thread NPT3/4 | Immersion, thread NPT3/4 | Immersion, thread G3/4 |
| Cable Length | Default 5m, customizable | Default 10m, customizable | Customizable | Customizable |
| Housing Material | POM | POM+316L, titanium optional | POM | 316L |
3. Key Parameter Interpretation
| Parameter | Meaning | Applicable Scenarios |
| Measurement Range | The range in which the sensor can accurately measure ammonia nitrogen concentration. Different models have different ranges. | Low-concentration scenarios: e.g., drinking water sources, purified water production.High-concentration scenarios: e.g., industrial wastewater discharge, livestock and poultry wastewater. |
| Temperature Compensation | Corrects measurement results affected by water temperature, which influences the ionization equilibrium of ammonia and electrode response. | Natural rivers, lakes, etc., where water temperature changes significantly due to season or climate. |
| pH Compensation | Corrects ammonia nitrogen measurements affected by pH, which influences the NH4+ / NH3 ratio. | Water bodies with large pH fluctuations, such as industrial wastewater or effluent from wastewater treatment plants. |
4. Step-by-Step Selection Process
Step 1: Define Measurement Range
- Estimate or test the ammonia nitrogen concentration in your water body. If unsure, use lab testing or portable ammonia nitrogen meters for preliminary measurement.
- Select the appropriate sensor range and accuracy based on the parameter comparison table.
Step 2: Determine Environmental Compatibility
- Choose a sensor suitable for site temperature and pressure. Pressure is usually related to installation depth.
- Consider housing material; for highly corrosive chemical wastewater, KWS-201 with titanium housing is recommended.
Step 3: Confirm Output Requirements
- Verify the required output format for data acquisition.
- Ensure the on-site power supply meets sensor requirements.
Step 4: Consider Cable Length and Customization
- Check the distance between the sensor installation point and the control system. All models support customizable cable length.
- For long distances, contact us to customize the cable length.
Step 5: Consult Experts
- If still unsure, consult the KACISE technical team. They can provide tailored advice based on your requirements and site conditions.
5. Typical Application Scenarios
| Application | Recommended Model | Reason |
| Drinking Water | KWS-250 (0~10 mg/L) | Low ammonia nitrogen concentration, requires high resolution and precision. |
| Aquaculture | KWS-290 / KWS-201 | Medium ammonia nitrogen concentration, complex water quality, requires real-time online monitoring to adjust treatment processes. |
| Industrial Wastewater | KWS-200 | High and fluctuating ammonia nitrogen concentration, significant pH and temperature variations. KWS-200 achieves ±5% accuracy at 1000 mg/L NH4-N. |
6. Summary
To help you quickly identify the appropriate KWS series ammonia nitrogen sensor, we briefly review the key points of this article: by comparing the parameters of the KWS series products, you can preliminarily select a model based on measurement range, accuracy, and compensation requirements; understanding the meaning of key parameters can help you match the most suitable scenario; finally, following the five-step selection process (define measurement range → analyze environment → confirm output → evaluate cable length → consult experts) can help avoid selection mistakes. The typical application table provides direct reference for common fields, allowing you to quickly find the recommended model.If you still have selection questions or need a customized solution based on specific measurement requirements, feel free to contact us directly—the professional team will provide one-on-one guidance to help you choose the most cost-effective ammonia nitrogen sensor.
If you are unsure which model to choose, feel free to contact us with your application details for technical support.
