The manufacturer says I can calibrate my chlorine dioxide sensor with chlorine. What is the difference between calibrating it with ClO2 and CL2?
Many sensors have an interference ratio to other gases (see FAQ5), allowing this interfering gas to be used to calibrate the sensor. However, it is usually best to calibrate the sensor with the gas being detected if at all possible. Interference factors may vary from sensor to sensor, or change as the sensor ages. For example, while some ClO2 sensors do respond to chlorine, others do not and need to be calibrated with chlorine dioxide gas (cross sensitivity to chlorine is often undesirable when monitoring for chlorine dioxide).
