Thank you for purchasing the Smart Wireless Drop Bubble Counter. We pride ourselves on producing high quality products that meet with the demands of the busy classroom environment. If you have any problems using this sensor, please read this documentation in full before contacting the Data Harvest support team. 

The Bubble Counter can be used to count either drops of fluid falling from a dropping device e.g. during a titration, or bubbles rising through fluid in a column. 

The Counter has an infrared emitter and a receiver separated by a 83 mm air gap. When the light beam from the emitter is interrupted (e.g. by a drop or bubble) it creates a digital signal that is counted by the internal counter module. 

The red LED is an indicator, which will blink as a drop or bubble passes through the infrared beam. There is a small button close to the indicator that can be pressed to reset a count to zero. 


The Smart Wireless Drop Bubble Counter is USB and Bluetooth compatible. Using Bluetooth, a sensor can connect to mobile devices, tablets, laptops and desktops. 

The Drop / Bubble Counter is equipped with a microcontroller that contains the calibration for each of its ranges. They are:

  • The Drop/Bubble Count range. Counts the absolute number of drops or bubbles detected as they pass through the infrared beam. Data is displayed as the total number of drops or bubbles rather than volume. 
  • The pre-set calibrated Volume ranges, which are 23 drops/cm3, 24 drops/cm3, 25 drops/cm3, 26 drops/cm3, 27 drops/cm3, 28 drops/cm3 and 29 drops/cm3. When any of these ranges are selected the drops counted are automatically converted and displayed as Volume in cm3.