Hach LDO AQS sensors User Manual

Contents

Table 3 Salinity (PSU) per conductivity value (mS/cm) (continued)mS/cm PSU mS/cm PSU mS/cm PSU mS/cm PSU8 5 19 13 30 21 42 309 6 20 13 31 22 44 3210 6 21 14 32 22 46 3311 7 22 15 33 23 48 3512 8 23 15 34 24 50 3713 8 24 17 35 25 52 3814 9 25 17 36 25 54 4015 10 26 18 37 26MaintenanceW A R N I N GMultiple hazards. Only qualified personnel must conduct the tasks described in this section of thedocument.Maintenance scheduleThe maintenance schedule shows minimum intervals for regular maintenance tasks. Performmaintenance tasks more frequently for applications that cause electrode fouling.Note: Do not disassemble the probe for maintenance or cleaning.Maintenance task Recommended minimum frequencyClean the sensor 90 daysInspect the sensor for damage 90 daysReplace the sensor cap 2 years or more frequently, if necessaryClean the sensorClean the exterior of the sensor with a soft, wet cloth.Note: If the sensor cap must be removed for cleaning, do not expose the interior of the cap to direct sunlight forextended periods of time.Change the sensor capW A R N I N GPotential explosion hazard. The sensor setup cap is not rated for hazardous location use.Replacement sensor caps and setup caps are shipped with installation instructions. Refer to theincluded instructions to change the cap. After the new sensor cap is installed, make sure that the lotnumber on the sensor cap is the same lot number that is read by Modbus. The sensor uses thecalibration information from the sensor cap.For best performance and accuracy, replace the sensor cap:• Every two years, or more frequently if necessary• When routine inspection shows significant erosion of the sensor capEnglish 9