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Digital RS485 Online Nitrate Nitrogen (NO₃⁻) Sensor Probe for Water Quality Monitoring
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Digital RS485 Online Nitrate Nitrogen (NO₃⁻) Sensor Probe for Water Quality Monitoring

NO3 absorbs at 210 nm UV light. When the Spectrometer Nitrate sensor is working, the water sample flows through the slit. When the light from the light source in the probe passes through the slit, part of the light is absorbed by the sample flowing in the slit, and the other light passes through the sample and reaches the other side of the probe. Calculate the concentration of nitrate.
This product is widely used in drinking water, surface water, industrial production process water, sewage treatment and other fields. Continuously monitor the concentration of nitrate dissolved in water, especially for monitoring sewage aeration tanks, controlling denitrification process.
Model DUVNO3-900
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Detail

Product Overview

The Industrial Online Nitrate Nitrogen Sensor Probe is a high-performance water quality monitoring instrument designed for continuous detection of dissolved nitrate (NO₃⁻) concentration in water. Equipped with RS485 communication interface (Modbus protocol), it supports seamless integration with industrial control systems and IoT platforms, making it ideal for drinking water, surface water, industrial process water, and wastewater treatment applications. With its reagent-free design and robust protection features, the sensor ensures reliable, low-maintenance operation in diverse industrial and environmental scenarios.

Key Features

  • Direct Immersion Spectrometer Design: Adopts spectrometer-based detection technology for direct immersion measurement, eliminating the need for sampling, pre-processing, or complex sample delivery systems—simplifying on-site deployment.

  • Reagent-Free & Eco-Friendly: No chemical reagents required, avoiding secondary pollution and reducing long-term operational costs.

  • Rapid Continuous Monitoring: Short response time enables 24/7 real-time data acquisition, capturing dynamic changes in nitrate concentration promptly for process control.

  • Automated Maintenance: Integrated automatic cleaning function minimizes manual maintenance workload, ensuring consistent measurement accuracy and extending sensor service life.

  • Robust Protection Mechanisms: Features reverse polarity protection for the power supply and protection against incorrect wiring (RS485 A/B terminals connected to power), enhancing operational safety and sensor durability.

  • Flexible Connectivity: Supports RS485 (Modbus protocol) for wired integration and offers an optional wireless data transmission module for remote monitoring and system expansion.

    Applications

  • Water Quality Monitoring: Continuous detection of dissolve

  • d nitrate concentration in drinking water, surface water (lakes, rivers, reservoirs), and industrial production process water.

  • Wastewater Treatment: Specialized for monitoring nitrate levels in sewage aeration tanks, supporting precise control of denitrification processes to ensure compliance with nitrogen discharge standards.

  • Environmental & Industrial Scenarios: Suitable for municipal wastewater treatment plants, chemical, pharmaceutical, food & beverage, and agricultural wastewater monitoring, as well as ecological water quality assessment.



Specifications

Item

Specification

Measuring Range

0.140.0mg/L 2mm

Accuracy

± 5%

Repeatability

± 2%

Resolution

0.01 mg/L

Pressure Range

≤0.4Mpa

Sensor Material

Body: SUS316L (Standard Version); Cable: PUR

Power Supply

9~36VDC

Communication

MODBUS RS485

Storage Temperature

-15 ~ 50°C

Operating Temperature

0 ~ 45°C (Non-freezing)

Weight

3.2KG

Protection Rating

IP68/NEMA6P

Cable Length

Standard 10 m, extendable up to 100 m





FAQ – Frequently Asked Questions


1. Where are your products manufactured?

Our products are proudly designed and manufactured in China, following international quality standards and certified processes.


2. Can you provide OEM/ODM services for international clients?

Yes, we offer customized solutions and private labeling to meet your brand’s needs worldwide.


3. Are your products compliant with international safety and quality standards?

Absolutely. Our products are tested to meet CE, RoHS, and other international certifications.


4. How do you handle shipping and delivery for overseas orders?

We cooperate with major international couriers to ensure fast and reliable delivery to your location.


5. Can I get product samples before placing a large order?

Yes, we provide samples so you can evaluate product quality before committing to bulk orders.


6. What is the typical lead time for production and delivery?

For standard products, we usually ship within 5–7 days after order confirmation. Customized products may take slightly longer.


7. How do you support clients after the purchase?

We offer 24/7 technical support, product guidance, and warranty service to ensure smooth operation.


8. Do you provide support for international clients after purchase?

Yes, we offer remote technical assistance, manuals in English, and prompt solutions to any issues, ensuring smooth use worldwide.


9. How can I place an order if I am located overseas?

You can contact our sales team directly via email or website inquiry. We provide professional guidance throughout the ordering process.


10. Why should I choose your company over other suppliers in China?

We combine over 30 years of manufacturing experience, advanced technology, strict quality control,

and global customer service to deliver reliable, high-quality solutions.


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