DF Robot Non-contact Liquid Level Sensor

This is a non-contact liquid level sensor with a status indicator and adjustable sensitivity. It is especially suitable for detecting the liquid level of all sorts of non-metal small diameter pipes (outer diameter D≤10MM). The status feedback of the sensor can be given in real-time. Besides that, the sensor comes with a 4pin sensor adaptor that can directly collect digital signal, convenient for connecting with Arduino or other microcontrollers.

This non-contact liquid level sensor is developed on advanced signal process technology by high-speed signal processing chip. It can measure the liquid level of a closed container without the influence of container wall thickness, and will not be affected by corrosive liquids like strong acid and alkali, or other impurities.

Quick Spec

• Power Supply: 5 ~ 24V
• Output: switch quantity
• Response Time: 500ms
• Operating Temperature: -5 ~ +105°C
• Suitable Pipe Diameter: ≤10mm
• Liquid Level Error: ±1.5mm
• Material: ABS
• Waterproof Performance: IP65
• Net Weight: 32g

Installation

Wiring Diagram

Sample Code

/*!
 * @File  DFRobot_Level_Sensor.ino
 * @brief  Detecting the liquid level of non-metallic containers,and check the status of sensor through serial port
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @licence  The MIT License (MIT)
 * @author  [liunian]([email protected])
 * @version  V1.0
 * @date  2020-08-13
 */
int inPin = 8;
boolean running = 0;//when running=1, the liquid is detected, print out 1, otherwise, print out 0; running=0, the liquid is detected, print out 0, otherwise, print out 1.
int modePin = 9;

void setup()
{
  Serial.begin(9600);
  pinMode(inPin, INPUT);
  pinMode(modePin, OUTPUT);
  digitalWrite(modePin, running);
}

void loop()
{
  Serial.println(digitalRead(inPin));
  delay(100);
}

Working Principle

A Non-contact liquid level sensor is used for detecting whether there is liquid by water induction capacitor. When there is no liquid approaching the sensor, there will be some certain static capacitance to ground on the sensor due to the presence of distributed capacitance. When the liquid level rises slowly to approach the sensor, the liquid parasitic capacitor will be coupled to the static capacitance so that the final capacitance value will increase. The changed capacitance signal will be input to the control IC for signal conversion, by which to transform the changed capacitance value into the variation of the certain electric signal. Then the degree of the variation can be detected and determined through specific algorithms. When the variation exceeds a threshold value, it means the liquid level reaches the sensing point.

Resources

• Product Page
• Product Wiki

Shipping List

• 1 x Small Pipe Diameter Level Sensor
• 1 x Gravity: 4Pin Sensor Adapter
• 1 x Screwdriver