AC-Driven Conductivity Sensor Module

This water conductivity sensor employs AC excitation to prevent electrode polarization, ensuring stable and repeatable TDS measurements over extended deployment. Built as a waterproof PCB module, it includes a 60 cm dual-electrode probe (XH2.54-2P interface), white casing, and a 3-pin XH2.54-3P module interface for easy connection. Operates on 3.3–5.5 V DC power, draws 3–6 mA, and delivers a linear 0–2.3 V analog output. Measures TDS from 0 to 1000 ppm with ±10% full-scale accuracy at 25°C. Suitable for hydroponics, aquaponics, and domestic water testing. Key limitations: max operating temperature 55°C; probe must be positioned centrally in vessel; only probe and wires are waterproof — the signal board and connector must stay dry.