NSDD-Lite3 Multi-spectral Commercial Water Quality Sensor
The NSDD6 is a self-cleaning spectral water quality sensor capable of real-time monitoring of multiple physical and chemical parameters. Operating without any chemical reagents, it ensures zero secondary pollution to the water. With this sensor, users can instantly access a comprehensive range of water quality data, enabling prompt and accurate assessments of water conditions.
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NSDD-Lite3
Commercial-Grade Multi-spectral Water Sensor
The NSDD-Lite3 is an advanced online spectral sensor designed for real-time monitoring of organic water quality indicators. Operating without chemical reagents, the sensor ensures zero secondary pollution to the water source.
It is an ideal solution for a wide range of applications, including commercial water purifiers, central purification systems, ultrapure water machines, secondary water supply equipment, industrial pure water testing, desalination, and laboratory environments. With the NSDD-Lite3, users can access real-time multi-parameter data to assess water quality conditions promptly and accurately.
Key Features:
- Simultaneous Multi-Parameter Monitoring Supports real-time online detection of up to 4 water quality indicators simultaneously.
- Non-contact Spectral Sensing Utilizes advanced optical technology for precise, non-invasive measurements.
- Reagent-free & Zero Consumables Eliminates the need for chemical reagents, preventing secondary pollution and reducing maintenance costs.
- Automatic Temperature Compensation Built-in temperature calibration ensures data accuracy across varying environments.
- Ultra-low Power Consumption Optimized energy efficiency for long-term continuous operation.
- Flexible Communication Options Supports both UART and RS485 interfaces to suit different integration needs.
- High Pressure Resistance Robust design capable of sustained operation in high-pressure environments up to 1.5 MPa.
100% In-House R&D
Space-Flight Proven
TOC
COD
UV254
Temp
Applications
Flexible Installation · Stable & Reliable · Versatile Applications
The NSDD-Lite3 features a compact, integrated design that allows for flexible installation in various piping systems and tanks, meeting the demands of online water quality monitoring across diverse operating conditions. Equipped with a standard G1/2 thread interface, the sensor can be directly mounted using dedicated stainless steel tees or fittings, ensuring a simplified setup and high system compatibility.
In terms of structural and sealing integrity, the NSDD-Lite3 is optimized for long-term online performance. It operates reliably under high-pressure conditions, supporting a continuous working pressure of up to 1.5 MPa—making it ideal for continuous, unmanned industrial and commercial systems.
316L Stainless Steel Body · Hygienic Design · Corrosion Resistance
Constructed with a premium 316L stainless steel housing, the NSDD-Lite3 offers exceptional resistance to corrosion, pressure, and ensures hygienic safety. It is engineered to perform in demanding environments, including pure water, ultrapure water, high-salinity water, and various industrial media. This robust design prevents material leaching and secondary pollution, satisfying the most stringent requirements for high-purity water applications.
| ● Commercial Water Purification Equipment |
| ● Food & Beverage Processing |
| ● Ultrapure Water Systems |
| ● Secondary Water Supply / Pumping Stations / Pipelines |
| ● Industrial Pure Water Testing |
| ● Seawater Desalination |
| ● Laboratory / Medical Equipment |
Installation Methods
Flexible In-line Mounting: Paired with specialized tee accessories, the sensor supports easy pipeline integration. Standard G1/4 threading allows for effortless connection and adaptation to multiple pipe sizes.
Through-Wall Installation: Effortlessly mount the sensor on water tanks or reservoirs to enable continuous online monitoring. Ensure secure sealing to prevent leaks during setup.
Technical Specifications
Absolute Maximum Ratings
| Parameter | Symbol | Value | Unit |
| Supply Voltage | Vcc | -0.3…5.5 | V |
| Max. Operating Current | I_max | 50 | mA |
| Max. Power Consumption | P_max | 250 | mW |
| Digital Port Voltage | Vio | -0.3…5.5 | V |
| Operating Temperature | Topr | 0…50 | ℃ |
| Storage Temperature | Tstg | -10 … 70 | ℃ |
| Operating Water Pressure | Pre | 0…1.5 | MPa |
| Max. Measurement Rate | FD_max | 5 s/reading | / |
* Exceeding the conditions listed above may cause permanent damage to the sensor!
Electrical Connections
The electrical interface for the external control board utilizes a standard XHB 2.54mm 4-pin socket. The pinout details are described below:
The electrical characteristics of the interface are as follows:
| Pin | Symbol | Function | Voltage Requirement |
|---|---|---|---|
| 1 | VCC | Power Supply (Red) | 5V |
| 2 | GND | System Ground (Black) | 0V |
| 3 | RX | UART Data Receiver (Blue) | 0-5V |
| 4 | TX | UART Data Transmitter (White) | 0-5V |
For interface connections, please refer to the diagram below:
Notes:
-
The sensor features a built-in isolated power supply, and the communication interface utilizes optocoupler isolation.
-
A stable power supply is critical for ensuring measurement accuracy and sensor stability. It is recommended to keep the power supply ripple below 20 mV.
-
The maximum voltage level of the digital interface must not exceed 5.5V.
Mechanical Specifications
The product structure is as follows:
Dimensions:
Detailed Specifications
| Parameter | Symbol | MIN | TYP | MAX | Unit | Notes |
| Operating Voltage | Vcc | 4.5 | 5 | 5.5 | V | |
| Operating Current | Iop | 45 | 50 | mA | During measurement | |
| Standby Current | Is | 20 | 23 | 30 | mA | Standby mode |
| Digital Interface Voltage | Vio | 3 | 5 | V | ||
| Communication Distance | D | / | 100 | 100 | cm | |
| Communication Baud Rate | BD | / | 115200 | / | bps | |
| Response Time | T | / | 1 | 3 | S | |
| Recovery Time | T_r | 3 | 5 | / | S | |
| Measurement Interval | T_in | 3 | 5 | / | S | Continuous mode |
| TOC Index | Measurement Range | 0 | 20 | mg/L | ||
| Resolution | / | 0.1 | / | mg/L | ||
| Consistency | -(0.1+R5%) | +(0.1+R5%) | mg/L | k=2, see Note 1 | ||
| Repeatability | -0.04 | 0.04 | mg/L | |||
| Accuracy | -15%FS | 15%FS | mg/L | see Note 2 | ||
| COD Index | Measurement Range | 0 | 20 | mg/L | ||
| Resolution | / | 0.1 | / | mg/L | ||
| Consistency | -(0.1+R5%) | +(0.1+R5%) | mg/L | k=2 | ||
| Repeatability | -0.04 | 0.04 | mg/L | |||
| Accuracy | -15%FS | 15%FS | mg/L | see Note 2 | ||
| UV254 Index | Measurement Range | 0 | 0.5 | AU/cm | ||
| Resolution | / | 0.0001 | / | AU/cm | ||
| Consistency | -0.001 | 0.001 | k=2 | |||
| Repeatability | -0.001 | 0.001 | ||||
| Accuracy | -15%FS | 15%FS | ||||
| Temperature | Range | 0 | 80 | ℃ | ||
| Resolution | / | 0.01 | / | ℃ | ||
| Consistency | -0.5 | 0.5 | ℃ | |||
| Repeatability | -0.2 | 0.2 | ℃ | |||
| Accuracy | -0.5 | 0.5 | ℃ | |||
| Ambient Operating Temp. | Topr | 0 | 25 | 50 | ℃ | |
| Sample Water Temp. | Ts | 0 | 25 | 80 | ℃ | |
| Storage Temp. Range | Tstg | -10 | 25 | 70 | ℃ | |
| Operating Water Pressure | Pre | 0 | 1.2 | MPa | ||
| Connection Size | G1/2 | Thread Type | ||||
| Enclosure Rating | / | IP66 | / | |||
| Dimensions | / | 38 | / | mm | Housing Diameter | |
| Weight | / | 185 | / | g |
Notes:
1. R refers to the sensor Readout. For example, if TOC = 2, the consistency is ±0.2; if TOC = 4, the consistency is ±0.3.
2. FS stands for Full Scale. Due to the complexity of water pollutants, this value indicates the maximum error: Range 1 (0-4 mg/L) has a max accuracy error of ±0.6; Range 2 (4-8 mg/L) has a max accuracy error of ±1.2; Range 3 (8-20 mg/L) has a max accuracy error of ±3.
Customization Options
When standard models do not fully meet your requirements, we offer flexible customization services. Our customizable options include:
| Housing Material | PTFE (Teflon), PPS, Aluminum Alloy, etc. |
| Measurement Range | Please contact our sales team for details |
| Cable / Connector | Please contact our sales team for details |
Optional Accessories
Optional Standard Accessories List
 |
Dedicated G1/2 Tee Fitting |
 |
USB-C to TTL Serial Adapter |
Resource Center
The information on this website is subject to change without notice. The latest version on the official website shall prevail. Unauthorized modification, reproduction, or distribution of this material is strictly prohibited.
| Product Brochure | Download |
| User Manual | Download |
| NSDD6 Debugging Software | Download |
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