Calibration
8.2 Recommendations for Successful Measurement and Calibration
Selection and care of cell essential
Successful measurements and calibration depend upon selection and care of the cells. Always prepare cells and their mountings in accordance with the instructions supplied with them, observing temperature, pressure and flow limitations.
Recommendations
Note the following recommendations:
∙For most accurate temperature measurement and compensation, insulate the outer body of the cell to minimize the effect of ambient conditions on process temperature measurement.
∙Rinse the cells thoroughly with
∙Always deactivate control or alarm circuits before removing cells from the process.
∙Do calibration trim with a reference solution which is at about the same temperature and conductivity as the process solution.
∙Inspect and, if necessary, clean the cells periodically according to experience and conditions.
ATTENTION
For successful measurement in pure water applications where plastic piping is used, you may have to provide an earth ground for the cell. If the cell constant is 0.01, 0.1, or 1.0, run a wire from the black electrode terminal of the cell to the lower card retainer bracket screw. Do not ground cells having cell constants of 10, 25, or 50.
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