The INDUSKEY INK200 series online optical dissolved oxygen sensor adopts advanced fluorescence lifetime technology, featuring no electrolyte, low maintenance, zero measurement drift, and independence from water flow rate. It integrates a high-precision temperature sensor for automatic compensation within 0–50°C, equipped with a MODBUS/RS-485 digital interface and EMC/EMI anti-interference capability. With an IP68 waterproof titanium alloy casing, it is suitable for harsh industrial environments and widely applied in precise dissolved oxygen monitoring in wastewater treatment, aquaculture, environmental monitoring, and other scenarios.
Positioned as an industrial-grade high-precision online dissolved oxygen monitoring sensor, it leverages advanced fluorescence lifetime technology to form its core competitiveness, fundamentally avoiding pain points of traditional sensors such as electrolyte dependence, measurement drift and flow rate restriction. Integrated with 0–50°C automatic temperature compensation and MODBUS/RS-485 digital interface, it features EMC/EMI immunity. Its titanium alloy hardware is adapted to harsh industrial environments, and its core value is to provide a low-maintenance, high-stability and flow-rate-free dissolved oxygen monitoring solution for industrial water treatment and process monitoring. It is a practical application of next-generation optical sensing technology in industrial water quality monitoring.
2. Sensing Technology & Self-Cleaning System
The core adopts the fluorescence lifetime method, measuring dissolved oxygen by detecting fluorescence decay time, which fundamentally eliminates the problems of measurement drift and water sample flow rate dependence of traditional sensors and greatly improves data stability. Equipped with real-time temperature compensation technology, it integrates a high-precision temperature sensor that can correct data in real time according to water temperature to ensure measurement accuracy in the full temperature range of 0–50°C. It also has intelligent data processing capability: the sensor independently processes raw data internally and transmits calibrated dissolved oxygen values via RS-485 (MODBUS) to meet the requirements of reliable industrial communication. There is no design related to the self-cleaning system, and the core technology focuses on "accurate detection + stable transmission".
3. Key Features & Competitive Advantages
Key Features
Covers the full dimensions of detection, maintenance, adaptation, protection and installation: zero drift and flow rate independence, membrane/electrolyte-free for low maintenance, 0–50°C automatic temperature compensation, RS-485/MODBUS standard interface, onboard calibration for true plug-and-play, EMC/EMI high anti-interference, IP68 waterproof, titanium alloy housing, 0–50 mg/L wide measurement range, G3/4 screw thread for flexible installation, and 6–24V wide voltage with ultra-low power consumption (0.1W).
Competitive Advantages
1. Technological Advantage: The fluorescence lifetime method surpasses traditional electrochemical sensors in principle, with no drift and no flow rate restriction, achieving better measurement stability.
2. Operation and Maintenance Advantage: The membrane/electrolyte-free design eliminates regular replacement and maintenance steps, significantly reducing labor and consumable costs.
3. Adaptation Advantage: Wide temperature compensation, wide voltage power supply and standard industrial communication interface enable seamless integration with PLC/DCS/SCADA systems and adaptation to distributed deployment.
4. Protection Advantage: Titanium alloy housing with IP68 ingress protection supports long-term submersion at a maximum water depth of 60m, adapting to harsh and highly corrosive industrial monitoring environments.
5. Installation Advantage: Onboard calibration, standardized screw thread and customizable cable realize plug-and-play, improving the efficiency of installation and commissioning.
4. Technical Specifications
Parameter
Specification
Model
INK200
Measurement Principle
Fluorescence lifetime method
Measurement Range
0–50 mg/L or 0–500% saturation
Accuracy
0–20 mg/L: ±1% or ±0.2 mg/L; >20 mg/L: ±5% or ±0.6 mg/L
Temperature Range
0–50°C (built-in automatic temperature compensation)
Max Water Depth
60m
Housing Material
Titanium (Ti)
IP Rating
IP68
Sensor Interface
RS-485, MODBUS RTU protocol
Power Requirements
0.1W (DC 6–24V, >50mA)
Installation
G3/4 screw thread, immersive installation
Sensor Size
Φ26mm × 187mm (with protective cover
Cable Length
10m (default), customizable
Calibration Method
One-point or two-point calibration
Test Environment
All parameters tested in laboratory standard liquid environment
All parameters are designed around industrial-grade high adaptability, high precision and high durability with no shortcomings in core key parameters. The overall specifications are closely aligned with the actual application scenarios of industrial sites, and all data are verified through laboratory tests with high reference value.
5. Applications
Based on the product characteristics of low maintenance, high stability, wide adaptability and high precision, the application scenarios cover four major fields: industry, aquaculture, environmental protection and food, all of which are core scenarios with rigid requirements for the accuracy and stability of dissolved oxygen monitoring.
1. Wastewater Treatment: Process control in aeration tanks and activated sludge systems, as well as effluent monitoring. It provides accurate DO data for water treatment process regulation to ensure treatment efficiency.
2. Aquaculture: Precision DO monitoring in fish farms, shrimp hatcheries and recirculating aquaculture systems (RAS). It helps regulate the aquaculture environment and improve the survival rate of aquaculture products.
3. Environmental Monitoring: Continuous DO measurement in rivers, lakes and reservoirs, providing long-term and stable water quality data for ecological protection and environmental monitoring research.
4. Food & Beverage Processing: DO control in brewing, soft drink production and food preservation processes, ensuring product quality and production safety through precise oxygen control.
