DFRobot Gravity HCL Sensor (Calibrated) – I2C & UART


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Approx Restocking Date: 25 to 30 Days
SKU: 1209999
  1. Working Voltage: 3.3~5.5V DC
  2. Working Current: <5mA
  3. Output Signal: I2C, UART output
  4. Working Temperature: -20~50℃
  5. Working Humidity: 15~90%RH (non-condensing)
  6. Compatible with 3.3~5.5V main controllers


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Brand: DF Robot
Category: Gas and Dust Sensor

This is a HCL ( hydrogen chloride )Sensor (Calibrated) – I2C &amp; UART sensor that detects oxygen 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 oxygen in the environment. Can be widely applied to fields like portable devices, air quality monitoring devices, industries, mines, warehouses, and other spaces where the air is not easy to circulate.

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 an oxygen concentration detector.

If you by this product you will get ( 1 PCB, 1 Connection wire, 1 HCL Sensor (Calibrated) – I2C &amp; UART ) All products are brand new & Comes with  6 Months Warranty. The products is easy to handle & easy to use also easy to operate with your projects,

Useful link:

DFRobot Gravity HCL sensor tutorial.


  1. Detection Gas: CO, O2, NH3, H2S, NO2, HCL, H2, PH3, SO2, O3, CL2, HF(Need to change different probe)
  2. Factory-calibrated, accurate measurement
  3. High sensitivity, low power consumption
  4. New condition.
  5. Excellent stability and anti-interference
  6. Three output modes: I2C, UART and analog
  7. Long service life(2 years)
  8. Compatible with 3.3~5.5V main controllers
  9. 32 modifiable I2C addresses
  10. Reverse connection protection
  11. Temperature compensation
  12. Threshold alarm

Packages Includes:

1 x DFRobot Gravity HCL Sensor (Calibrated) – I2C & UART

SKU: 1209999 Category:


Working Voltage

3.3 to 5.5V DC

Working Current(mA)


Output Signal

I2C, UART output (0~3V), analog voltage

Operating Temperature (°C)


Working Humidity Range


Storage Temperature


Storage Humidity



>2 years (in the air)

Shipping Weight 0.08 kg
Shipping Dimensions 13 × 9 × 4 cm
6 Months Warranty

This item is covered with a supplier warranty of 6 months from the time of delivery against manufacturing defects only. This is a quality product from the original manufacturer. Only manufacturing defects are covered under this warranty. Reimbursement or replacement will be done against manufacturing defects.

What voids the warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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Country Of Origin: China