| 摘要 |
<p>A conductivity measurement system provides one or more DC pulses to first an d second electrodes submerged in an aqueous solution such as, for instance, th e wash water of an industrial dishwasher. The voltage at the first electrode i s measured at first and second predetermined times after initiation of DC pulse(s). Linear regression of the first and second measured voltages is use d to calculate the voltage at the first electrode at the beginning of the DC pulse(s), i.e., at time t=0. The resulting voltage at time t=0 is then used to calculate the conductivity of the solution, thereby compensating for the effects of polarization. Further, the difference between the respective firs t and second measured voltages is compared to a predetermined threshold value to determine whether the electrodes are so contaminated that polarization compensation is no longer feasible, thereby signaling that the electrodes should be cleaned or replaced.</p> |
