Hi, I always get 0.04 in the serial port, and there is no change, even I block the transmit tube.

Name: Gravity: Analog Turbidity Sensor for Arduino
Brand: DFRobot
SKU: SEN0189
Price: 9.9 USD
Availability: InStock
Rating: 4.75 (4 reviews)

Please check the probe connection cable, if you plug it with a wrong side, it won't work.<img src="https://raw.githubusercontent.com/DFRobot/DFRobotMediaWikiImage/master/Image/SEN0189_Probe_Connection.jpg">

Gravity: Analog Turbidity Sensor for Arduino

Introduction

The Arduino turbidity sensor detects water quality by measuring the level of turbidity. It is able to detect suspended particles in water by measuring the light transmittance and scattering rate which changes with the amount of total suspended solids (TSS) in water. As the TTS increases, the liquid turbidity level increases. You may also check Liquid Sensor Selection Guide to get better familiar with our liquid sensor series.

This Arduino turbidity sensor has both analog and digital signal output modes. You can select the mode according to the MCU as the threshold is adjustable in digital signal mode.

Turbidity sensors can be used in the measurement of water quality in rivers and streams, wastewater and effluent measurements, sediment transport research, and laboratory measurements.

Please note that the top of probe is not waterproof!

Quick Comparison of the Water Quality Turbidity Sensors

Product Name

Gravity: Analog Turbidity Sensor for Arduino

UART Non-contact Optical Turbidity Sensor for Arduino

RS485 Industrial Water Quality Turbidity Sensor (0-1000 NTU)

Figure

SKU

SEN0189

SEN0554

SEN0710

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Principle

Light transmittance & scattering rate change

Infrared light transmittance & scattering (non-contact)

90° light scattering method

Method

Contact type, probe immersed in liquid

Non-contact, mounted on outer container wall

Contact type, probe immersed in liquid (IP68)

Output

Analog voltage 0–4.5V / Digital high-low level

UART-TTL (9600 bps)

RS485 (ModBus-RTU)

Range

Relative turbidity (no NTU value)

0–1000 NTU (resolution 0.1 NTU)

Temp. Compensation

Built-in, 0–60℃ automatic compensation

Power Supply

5V DC

10–30V DC

Waterproof Rating

Probe tip immersible, top not waterproof

Non-contact, no waterproof requirement

IP68 fully waterproof, can be submerged long-term

Response Time

<500ms

<1s

≤30s

Installation Requirements

Direct immersion, protect the top

Container diameter 40–50mm, transparent cylinder

Submersible; keep >5cm clearance around, 7cm obstacle-free below the probe

Typical Applications

Arduino education, simple experiments

Arduino education, corrosive liquids, non-contact required

Industrial wastewater, drinking water monitoring, environmental IoT

Specification

Operating Voltage: 5V DC
Operating Current: 40mA (MAX)
Response Time: <500ms
Insulation Resistance: 100M (Min)
Output Method: Analog/Digital
Analog Output: 0-4.5V
Digital Output: High/Low-level signal (you can adjust the threshold value by adjusting the potentiometer)
Operating Temperature: 5℃~90 ℃
Storage Temperature: -10℃~90℃
Weight: 30g
Adapter Dimensions: 38mm*28mm*10mm/1.5inches *1.1inches*0.4inches