The SC24V differential pH/ORP sensor is unique to the industry, offering maintenance free operation without any reference problems. In the SC24V differential pH/ORP sensor, the reference cell is made of glass, with no porous junction, so no electrolyte is in contact with the process. The differential measuring principle combines the normal potential generated by the pH glass with the potential from a Sodium pNa glass. In applications where Sodium-, Potasium- or Calcium-salt is present the glass will generate a stable reference voltage. This means the measurement can be done, eliminating problems caused by aging and pollution of the liquid junction. Experienced with a conventional reference electrodes.