TDS Sensor

SENSING PRINCIPLE: The TDS (Total Dissolved Solids) sensor measures the concentration of dissolved ions in water by detecting electrical conductivity. As the number of dissolved salts and minerals increases, the conductivity increases, allowing estimation of TDS levels.
SENSOR STRUCTURE: The system consists of a waterproof TDS probe and a signal conditioning module. The probe contains two electrodes that interact with the water sample, while the module processes the conductivity signal and converts it into an electrical output suitable for microcontrollers.
PIN CONFIGURATION: VCC (Positive power supply), GND (Ground), DATA/AO (Analog signal output).
OUTPUT SIGNAL: Provides an analog voltage output typically ranging from 0 to 2.3V, which corresponds to the measured TDS concentration in the water.
OPERATING VOLTAGE: Functions with a wide supply voltage range of approximately 3.3V to 5.5V, making it compatible with common microcontroller platforms.
MEASUREMENT RANGE: Capable of measuring TDS levels from approximately 0 to 1000 ppm (parts per million) with an accuracy around ±10% of full scale.
EXCITATION METHOD: Uses an AC excitation signal for measurement, which helps prevent electrode polarization and improves measurement stability during long-term use.
PROBE CHARACTERISTICS: Equipped with a waterproof probe designed for continuous immersion in water for extended monitoring applications.
PHYSICAL DIMENSIONS: Signal conditioning module size is approximately 42 mm × 32 mm × 15 mm with a total weight around 60 grams.
APPLICATION SCOPE: Commonly used in drinking water quality monitoring, hydroponics systems, aquariums, swimming pools, water purification systems, and environmental water analysis.