1. Product Overview
The INK312 is a high‑precision digital four‑electrode online conductivity and salinity sensor for continuous water quality monitoring. It offers better accuracy, wider measuring range, and higher stability than traditional two‑electrode sensors. It integrates temperature sensing and automatic temperature compensation (ATC), with an IP68 waterproof and corrosion‑resistant design for long‑term submerged use. It simultaneously measures and outputs conductivity, salinity, TDS, and temperature. Pre‑calibrated at the factory, it supports plug‑and‑play deployment. It is widely used in surface water, wastewater, aquaculture, and industrial monitoring.
2. Sensing Technology & Self-Cleaning System
Sensing Technology
The INK312 uses a four‑electrode measurement system: two excitation electrodes apply an AC voltage, and two sensing electrodes measure the induced current. This design separates excitation and detection circuits, eliminates polarization and contact resistance errors, and ensures stable measurement even in high‑conductivity liquids. Conductivity is calculated using the calibrated cell constant and Ohm’s Law for high accuracy. A built‑in temperature sensor enables automatic temperature compensation to maintain reliable readings across 0–50°C. Data is digitally processed and transmitted via RS485 MODBUS RTU for stable long‑distance communication.
Self-Cleaning System
The INK312 does not include an integrated self‑cleaning system (ultrasonic, mechanical, or chemical). A cleaning brush is provided as a standard accessory for manual maintenance.
3. Key Features & Competitive Advantages
Key Features
- Advanced four‑electrode technology, anti‑polarization, high stability
- Simultaneous measurement: conductivity, salinity, TDS, temperature
- RS485 + MODBUS for easy PLC/DCS/SCADA integration
- Automatic temperature compensation (ATC)
- IP68 waterproof, corrosion‑resistant housing (Ni+PEEK+Ti)
- Two available models for wide low‑to‑high conductivity ranges
- Factory pre‑calibrated, supports one‑/two‑point calibration
- Customizable cable length (standard 10m)
- Ultra‑low power consumption (0.2W), DC 9–24V supply
Competitive Advantages
- Superior performance: Four‑electrode design outperforms two‑electrode sensors in accuracy, range, and anti‑interference
- Plug‑and‑play: Pre‑calibrated for immediate use, reduces on‑site setup time
- Dual‑model choice: INK312‑A and INK312‑A3 cover diverse application needs
- Industrial‑grade reliability: IP68 and anti‑corrosion materials for harsh environments
- Digital native: Standard MODBUS communication for easy system integration
- Low power: Ideal for remote, battery‑powered, and solar monitoring stations
4. Technical Specifications
| Parameter |
INK312‑A |
INK312‑A3 |
| Measuring Principle |
Four‑electrode technology |
Four‑electrode technology |
| Conductivity Range |
0–100 mS/cm |
0–200 mS/cm (auto‑ranging) |
| Conductivity Accuracy |
±1% or ±0.01 mS/cm |
±1% or ±0.01 mS/cm |
| Salinity Range |
0–80 ppt |
0–175 ppt |
| Salinity Accuracy |
±1 ppt |
±1 ppt |
| TDS Range |
0–64000 mg/L |
0–128000 mg/L |
| Temperature Range |
0–50°C |
0–50°C |
| Protection Rating |
IP68 |
IP68 |
| Communication |
RS485, MODBUS |
RS485, MODBUS |
| Power |
DC 9–24V, 0.2W |
DC 9–24V, 0.2W |
| Dimensions |
Φ22 × 175.5 mm |
Φ22 × 175.5 mm |
| Cable |
10m (customizable) |
10m (customizable) |
| Housing Material |
Ni+PEEK+Ti |
Ni+PEEK+Ti |
5. Applications
- Surface water monitoring (rivers, lakes, reservoirs)
- Municipal wastewater treatment & discharge monitoring
- Industrial wastewater (chemical, electroplating, dyeing)
- Aquaculture (fish, shrimp, shellfish farming)
- Drinking water & purified water production
- Seawater desalination & brackish water treatment
- Industrial process water (cooling water, boiler water)
- Marine & coastal environmental monitoring
