DFRobot - UART Non-contact Optical Turbidity Sensor for Arduino

This non-contact turbidity sensor detects water quality by measuring the level of turbidity. Based on the optics principle, it is capable of detecting the light transmittance and scattering rate of the liquid in transparent cylinder containers with a diameter of 40–50mm, which will then be output as an UART data frame within a certain range that reflects the level of liquid turbidity.

The turbidity sensor comes with two infrared probes, which should be oppositely installed on a container. And it detects when the liquid level inside is higher than the two probes. The sensor can measure without coming into contact with liquid, making it less susceptible to corrosion from water or chemicals.

Installation

Selection Guide

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

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)

Relative turbidity (no NTU value)

0–1000 NTU (resolution 0.1 NTU)

Temp. Compensation

/

/

Built-in, 0–60℃ automatic compensation

Power Supply

5V DC

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

≤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

Add to Cart

• No mechanically moving parts, high reliability
• Small size & low cost

• Water quality monitoring system

• Supply Voltage: 5V
• Communication Mode: UART-TTL
• Applicable Cylinder Container Diameter: 40 to 50mm
• Baud Rate: 9600
• Operating Current: less than 10mA
• Response Time: less than 1s
• Operating Temperature: 5 to 60℃
• Storage Temperature: 0 to 65℃
• Service Life: 50000h
• Light Source: Infrared Light (IR)
• Wavelength: 950 nm
• Color Interference: High
• Probe material: Polycarbonate (PC)

• Turbidity Sensor × 1
• Gravity: 4Pin Sensor Adapter × 1