1. Product Overview
The Induskey INK215 is a high-performance online ammonium sensor designed for continuous monitoring of ammonia nitrogen (NH₄-N) in water. Utilizing advanced ion-selective electrode (ISE) technology, the INK215 provides accurate, real-time measurements without the need for chemical reagents, ensuring pollution-free operation and offering a more economical and environmentally friendly solution.
The sensor incorporates standard electrodes for ammonium ions, pH, and reference measurements, with an optional potassium ion electrode available for applications requiring potassium compensation. It provides automatic compensation for pH and temperature during ammonia nitrogen measurement, ensuring enhanced accuracy of results across varying water conditions.
Compared to traditional analyzers, its direct installation is more cost-effective, environmentally sustainable, convenient, and time-efficient. The compact design (Φ36 mm × 265 mm) with IP68 protection rating makes it ideal for both submerged and harsh industrial environment deployments.
2. Key Features & Competitive Advantages
A. Reagent-Free Operation
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Requires no chemical reagents, ensuring pollution-free operation
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More economical and environmentally friendly solution compared to traditional colorimetric analyzers
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Eliminates hazardous chemical handling, storage, and disposal costs
B. Ion-Selective Electrode Technology
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Utilizes the ion electrode method (ISE), eliminating the need for electrolytes
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Allows individual electrode replacement for ease of maintenance
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Specialized ammonium ion-selective membrane generates potential proportional to ion activity
C. Automatic Compensation Systems
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Auto pH Compensation: Provides automatic compensation for pH variations (4-10 pH range) in water samples, ensuring accurate NH₄-N measurement across different pH conditions
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Temperature Compensation: Integrated temperature sensor enables automatic temperature compensation from 0-50°C, ensuring consistent readings across the operating range
D. Digital Communication Interface
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Standard RS-485 interface with MODBUS RTU protocol for seamless integration
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Easy integration with SCADA systems, PLCs, data loggers, and remote monitoring platforms
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Supports multiple device addressing for multi-sensor network deployment
E. Flexible Calibration
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Factory calibrated with built-in calibration parameters prior to delivery
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Supports one-point or two-point calibration for on-site maintenance
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Ready for direct installation and immediate use
F. Rugged Construction
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IP68 protection rating for continuous submersion in harsh environments
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POM + 316L stainless steel (Ti) housing for superior durability and corrosion resistance
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Designed for underwater operation and industrial wastewater applications
G. Wide Measurement Range
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Dual range capability: 0-100 mg/L (standard) or 0-1000 mg/L (optional) for diverse application requirements
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0.01 mg/L resolution for precise low-level detection
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±10% or ±0.5 mg/L accuracy (whichever is greater)
H. Low Power Consumption
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Energy-efficient design: 0.25W power consumption
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DC 9-24V power supply, ≥1A suggested
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Ideal for remote monitoring and solar-powered installations
I. Optional Potassium Electrode
3. Technical Principle
3.1 Ion-Selective Electrode (ISE) Technology
The INK215 employs the ion-selective electrode method for ammonia nitrogen measurement. The sensor contains a specialized ammonium ion-selective membrane that generates a potential proportional to the logarithm of ammonium ion activity in the sample. This potential is measured against a stable reference electrode, and the Nernst equation is applied to calculate the NH₄-N concentration with high accuracy.
3.2 Multi-Electrode Architecture
The sensor integrates three standard electrodes:
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Ammonium Ion Electrode: Primary measurement sensor for NH₄⁺ detection
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pH Electrode: Continuous pH monitoring for compensation algorithms
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Reference Electrode: Stable potential reference for accurate measurement
Optional: Potassium ion (K⁺) electrode for interference compensation
3.3 Signal Processing
The sensor integrates a high-impedance amplifier and analog-to-digital converter directly at the measurement point. Raw electrode signals are conditioned, amplified, and digitized onboard, minimizing noise interference and ensuring signal integrity over the RS-485 communication line. Digital output eliminates analog signal degradation common in traditional systems.
3.4 Compensation Algorithms
The sensor continuously monitors pH and temperature to apply real-time compensation algorithms:
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pH Compensation: Since ammonium ion concentration is pH-dependent (NH₄⁺ ⇌ NH₃ + H⁺), the integrated pH measurement enables accurate total ammonia nitrogen calculation
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Temperature Compensation: Ensures consistent readings across the 0-50°C operating temperature range
3.5 Communication Protocol
The INK215 communicates via standard RS-485 serial interface using the MODBUS RTU protocol. This industry-standard communication method enables easy integration with existing industrial control systems, data loggers, and remote monitoring platforms. The protocol supports multiple device addressing for multi-sensor network deployment.
4. Technical Specifications
| Parameter |
Specification |
| Model |
INK215 / Y561-A |
| Measurement Principle |
Ionic electrode method (ISE) |
| NH₄-N Measurement Range |
0-100 mg/L (standard) / 0-1000 mg/L (optional) |
| NH₄-N Accuracy |
±10% or ±0.5 mg/L (whichever is greater) |
| NH₄-N Resolution |
0.01 mg/L |
| pH Measurement Range |
4-10 pH |
| Operating Temperature |
0-50°C |
| Protection Rating |
IP68 (continuous submersion) |
| Communication Interface |
RS-485, MODBUS RTU protocol |
| Power Supply |
DC 9-24V, ≥1A |
| Power Consumption |
0.25W |
| Sensor Dimensions |
Φ36 mm × 265 mm (with protective cover) |
| Cable Length |
10 m (standard), customizable |
| Calibration Method |
One-point or two-point calibration |
| Housing Material |
POM + 316L Stainless Steel (Ti) |
| Optional Electrodes |
Potassium ion (K⁺) electrode |
Note: The above technical parameters are measured in laboratory standard liquid environment. Contact Induskey for the latest specifications.
5. Applications
The INK215 is engineered for versatile deployment across multiple industries requiring continuous ammonia nitrogen monitoring:
Municipal Wastewater Treatment
Industrial Process Water
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Real-time monitoring in chemical, pharmaceutical, and food processing industries
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Process control and effluent monitoring for compliance
Aquaculture & Fisheries
Surface Water Monitoring
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Environmental monitoring of rivers, lakes, and reservoirs for water quality assessment
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Early warning systems for ammonia contamination events
Agricultural Runoff
Drinking Water Treatment
Power Plant Cooling Water
Swimming Pool Water Quality
