Note: This product includes product introduction, wiring diagram, and technical specifications. Product Introduction This equipment is designed for general household water quality measurement. Typical tap water TDS values are below 100 (approximately 90 in Shenzhen), while purified water typically measures under 10. The compatible TDS sensor measures the Total Dissolved Solids (TDS) value of water. TDS serves as an indicator of water purity and is applicable in domestic water monitoring and hydroponics. TDS (Total Dissolved Solids): Represents the concentration of dissolved solids (in milligrams) per liter of water. Generally, a higher TDS value indicates a greater concentration of dissolved substances and lower water purity. Thus, TDS is one parameter used to assess water cleanliness. Common TDS testing tools include handheld TDS pens. While affordable and simple to operate, they lack data transmission capability, long-term online monitoring, and advanced water quality analysis. Dedicated laboratory-grade instruments offer high accuracy and data connectivity but at significantly higher cost. This compatible TDS sensor bridges that gap — it delivers reliable TDS measurement when connected to a controller. This product is plug-and-play and user-friendly. It supports a wide input voltage range of 3.3–5.5 V and provides an analog output signal of 0–2.3 V, making it compatible with both 3.3 V and 5 V control systems. The measurement excitation uses an AC signal, effectively preventing electrode polarization, extending probe lifespan, and improving signal stability. The TDS probe is fully waterproof and suitable for prolonged submersion in water. Applications include water quality monitoring for domestic use and hydroponics. With this sensor, users can build custom TDS monitoring solutions to evaluate water purity. Important Notes: - The TDS probe must not be used in water exceeding 55°C. - Avoid placing the probe too close to the container’s edge, as this may affect readings. - The probe tip and cable are waterproof and safe for immersion; however, the connection interface and signal adapter board are not waterproof. Ensure proper protection during use. Features 1. Wide operating voltage: 3.3–5.5 V 2. Analog output signal: 0–2.3 V, compatible with 3.3 V and 5 V control systems 3. AC excitation signal prevents electrode polarization 4. Waterproof probe suitable for long-term immersion 5. Compatible design — easy connection, plug-and-play, no soldering required Technical Specifications Signal Adapter Board: - Input Voltage: 3.3–5.5 V - Output Signal: 0–2.3 V - Operating Current: 3–6 mA - TDS Measurement Range: 0–1000 ppm - TDS Measurement Accuracy: ±10% F.S. (at 25°C) - Dimensions: 42 × 32 mm - Module Interface: XH2.54-3P - Electrode Interface: XH2.54-2P TDS Probe: - Number of Electrodes: 2 - Overall Length: 83 cm - Connection Interface: XH2.54-2P - Color: White - Waterproof Design Package Includes: - 1 × TDS Signal Adapter Board - 1 × Waterproof TDS Probe - 1 × Analog Sensor Cable