ALGAEANDOTHER,GROWTHSONSENSOR :Algae or other growths may develop on the tip if the sensor isleft immersed in certain samples. These growths may interfere with accuracy and should be removed. Dip thetip of the sensor into a beaker containing hydrochloric acid (not sulfuric or nitric) of approximately 6N to 8Nstrength (50-60Z solution) for a few moments and then thoroughly flush with clean tap water. Experience withlocal conditions will determine the frequency of such cleaning. This may also be done before use as apreventive measure if the sensoris used when slime may grow on it.Long storage of the sensor in a beaker of distilled water may cause a build-up of bacterial slime. This can beprevented by adding a few drops of Formaldehyde to the water in which the sensor is stored. If this is notpractical, remove the slime as described above. If hydrochloric acid is not available, the slime may beremoved with wet paper or cloth and a detergent. Exercise care to avoid loosening or damaging themembrane.PREVENTIVEMAINTENANCE :To avoid malfunction and possible breakdown, the preventive maintenancechecks listed in the table below should be performed on a regular basis.25
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