BM25S4021-1

TDS Water Quality Detection Module

The BM25S4021-1 is a digital output TDS water quality detection module. The module supports 2-channel TDS and temperature detection, using the automatic temperature compensation to calculate the TDS value at 25℃. The module uses a low-voltage positive and negative pulse through the H-bridge IC to drive the TDS probe, combined with an algorithm to extend the service life of the probe. The module has been calibrated before delivery, which has high accuracy and low power consumption characteristics.

Attribute	Value
TDS measurement features:	Measurement range: 0ppm~5000ppm Error: – ±5% (5ppm~5000ppm, @25℃) – ±6% (5ppm~5000ppm, @5℃~60℃) Temperature compensation range: 0℃~60℃ (unfrozen) Resolution： – 0.1ppm (0ppm~500ppm) – 0.5ppm (500ppm~1500ppm) – 5ppm (1500ppm~2500ppm) – 10ppm (2500ppm~5000ppm)
Temperature measurement features:	Maximum measurement range: 0℃~60℃ Recommended measurement range: 5℃~55℃ Error: ±0.8℃ Resolution: 0.1℃
Operating current:	Operating mode: <8mA @ 5V Standby mode: <9μA @ 5V
Operating voltage range	3.1V~5.5V
Communication interface	UART 9600bps, 8-N-1

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