Ranges: 0-2 PPM and 0-20 PPM autoranging with Isolated 4 to 20 mA output
The SZ283 Potentiostatic sensor is designed for the measurement of Free Chlorine and is an “amperometric” measurement with constant potential made through 2 metal electrodes and a reference electrode dipped in a cell.
The current running through the cell consumes Chlorine and must therefore be renewed through constant liquid flow.
In the traditional amperometric measurement, it is difficult to maintain a constant relationship between cell current and Chlorine concentration, especially near zero because of the ORP and liquid resistance effects. As a result frequent zero and sensitivity calibration are needed.
ADVANTAGE OF POTENTIOSTATIC MEASUREMENTS :
In potentiostatic measurements, the electrodes potential is electronically controlled in relation to the liquid, providing a linear relationship current/concentration and a very stable zero value in oxidative absence.