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8 units will be available shortly.

Express post shipping available (product is on backorder)
This is a sensor that detects chlorine concentration and supports three output modes: analog, I2C, and UART. The probe has been calibrated at the factory, which can quickly and accurately measure the concentration of chlorine in the environment. Can be widely used in the detection of chlorine in the chemical, pharmaceutical production, and environmental protection fields.
The probe adopts the electrochemical principle, has the characteristics of strong anti-interference ability, high stability, high sensitivity, etc., and the service life is as long as two years. The sensor has 32 modifiable I2C addresses, an integrated temperature compensation algorithm, and a threshold alarm function, It has good compatibility with mainstream main control devices such as Arduino, ESP32, and Raspberry Pi. The easy-to-use Gravity interface, coupled with our sample code, can quickly build a chlorine concentration detector.
DFRobot has introduced 12 gas detection sensors in this series, CO, O2, NH3, H2S, NO2, HCL, H2, PH3, SO2, O3, CL2, HF, which are used in exactly the same way and data format, so you can combine them according to your needs.

Strong anti-interference ability
High stability
High sensitivity 

Chemical chlorine detection
pharmaceutical production chlorine detection
Environmental protection device

Detection Gas: Chlorine (CL2)
Detection range: 0~10ppm
Working Voltage: 3.3~5.5V DC
Working Current: <5mA
Output Signal: I2C, UART (0~3V), analog voltage
Working Temperature: -20~50°C
Working Humidity: 15~90%RH (non-condensing)
Storage Temperature: -20~50°C
Storage Humidity: 15~90%RH (non-condensing)
Lifespan: >2 years (in the air)
Adapter Plate Size: 37*32mm
Compatibility: Arduino, ESP32, Raspberry pi 


Shipping List
Gravity: Chlorine Signal Conversion Board x1
Chlorine sensor probe x1
Gravity - 4pin Cable x1 

The Gravity: CL2 Sensor (Calibrated) - I2C & UART appears in the following collections: