1.4.1 Calibration of the Conductivity Sensor

The conductivity sensor of the Levelogger is a highly sensitive device requiring regular calibration by the user. The conductivity calibration frequency is dependent on the water quality of the Levelogger’s monitoring environment. When monitoring in freshwater with good water quality, conductivity calibration may only be required once per year. On the other hand, conductivity calibration will be required more frequently when monitoring in polluted, salty, brackish, eutrophic or highly conductive water. To determine whether an LTC Levelogger should be recalibrated, test the unit in a solution with a known electrical conductivity value at a reference temperature. If that reference temperature is 25°C, set the LTC to record Specific Conductance in Channel 3: Conductivity, and observe the current reading by using the Current Measurement function. If this reading varies from the known Specific Conductance of the solution by greater than 1% of the Full Scale of Conductivity measurement, the unit should be recalibrated using the Conductivity Calibration Wizard procedure outlined in Section 5.7/8. Ensure that conductivity calibration is performed when the LTC is being set up for its initial use and after long periods of dry storage. If the LTC Levelogger has been dry stored for some time, allow the sensor to re-equilibrate by submerging in tap water for a minimum of 2 hours and up to 24 hours prior to re-calibration and reuse.