Photoelectric water liquid level sensor

Photoelectric water liquid level sensor


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SKU: #SB-A-00015 Category: Tags: , ,


This is a photoelectric water liquid level sensor that is operates using optical principles for Arduino. The advantages of this photoelectric water liquid level sensor are good sensitivity and no need for mechanical parts – meaning less calibration! The corrosion resistant probe is easily mounted and can handle high temperature and high pressure.  The arduino liquid sensor is equipped with an interface adapter for compatibility with the DFRobot “Gravity” interface.

Note: Avoid placing the sensor near bright lights or in direct sunlight as these can cause interference.


  • Model: FS-IR02
  • Type: Photoelectric liquid level sensor
  • Operating voltage: 5 VDC
  • Output current: 12 mA
  • Working temperature: – 25 ~ 105 ℃
  • Low level output: < 0.1 V
  • High level output: > 4.6 V
  • Liquid level detection accuracy: ±0.5 mm
  • Material: PC
  • Measuring range: No limit
  • Life: 50,000 hours
  • Dimension: 28 x 28 mm/ 1.1 x 1.1 inches
  • Cable Length: 450mm
  • Weight: 26g
Sample Code
* Liquid Level Sensor-FS-IR02
* ****************************************************
* This example is to get liquid level

* @author jackli(
* @version  V1.0
* @date  2016-1-30

* GNU Lesser General Public License.
* See <> for details.
* All above must be included in any redistribution
* ****************************************************/
int Liquid_level=0;
void setup() {

void loop() {
Serial.print("Liquid_level= ");Serial.println(Liquid_level,DEC);

Expected Results

When liquid comes in to contact with the sensor probe the microcontroller will output HIGH logic. When the liquid is not in contact with the probe the microcontroller will output LOW logic.

Packing list

x1 unit Liquid Level Sensor-FS-IR02 probe x1

x1 unit Liquid Level Sensor convert board x1

x1 unit PH2.0-3P Cable