TurbSense can be calibrated in three ways. Firstly, a separate device (commonly a hand held, portable turbidimeter) can be used to analyze the same sample as the TurbSense and this value can be used to perform the calibration.
Secondly, the sensor can be placed into a sample of known turbidity (such as a 25 NTU standard solution), and the TurbSense system can calibrate itself based on this. Because of the unique way in which the sensor performs the calibration, only a single standard is required and a zero point calibration isn’t needed (patented feature).
Thirdly, solid secondary calibration standards (available from Pi and its partners) provide a solid that when put against the end of the TurbSense provides a known response that can be used to either check or calibrate a TurbSense