Hach Polymetron User Manual

Contents

Hach Polymetron User Manual Manual pdf 16 page image

TroubleshootingIntermittent dataDuring calibration, data is not sent to the datalog. Thus, the datalog canhave areas where the data is intermittent.Test the conductivity sensorIf a calibration fails, first complete the maintenance procedures inMaintenance on page 15.1. Disconnect the sensor wires.2. Use an ohmmeter to test the resistance between the sensor wires asshown in Table 4.Note: Be sure that the ohmmeter is set to its highest range for all infinite (opencircuit) resistance readings.Table 4 Conductivity resistance measurementsMeasurement points ResistanceBetween blue and white wires 1089–1106 ohms at 23–27 °CBetween red wire and sensor body Less than 5 ohmsBetween black wire and inner electrode Less than 5 ohmsBetween black and red wires Infinite (open circuit)Between black and white wires Infinite (open circuit)Between red and white wires Infinite (open circuit)Between red and inner shield wires Infinite (open circuit)Between black and inner shield wires Infinite (open circuit)Between white and inner shield wires Infinite (open circuit)Between outer and inner shield wires Infinite (open circuit)If one or more of the measurements is incorrect, call technical support.Supply technical support with the serial number of the sensor and theresistance values measured.Sensor diagnostic and test menuThe sensor diagnostic and test menu shows current and historicalinformation about the instrument. Refer to Table 5. To access the sensordiagnostic and test menu, push the MENU key and select Sensor Setup,[Select Sensor], DIAG/TEST.Table 5 Sensor DIAG/TEST menuOption DescriptionSENSOR INFORMATION Shows the name and serial number that was enteredby the user.CARD INFORMATION Shows the version and the serial number for thesensor module.CAL DAYS Shows the number of days since the last calibration.CAL HISTORY Shows a list of the calibrations and the details foreach calibration.RESET CAL HISTORY Service use only. Resets the calibration history forthe sensor. All previous calibration data is lost.SENSOR SIGNALS Shows the current sensor signal and span in μS/cm.SENSOR DAYS Shows the number of days that the sensor has beenin operation.RESET SENSOR DAYS Resets the Sensor Days counter.Error listWhen an error occurs, the reading on the measurement screen flashesand all outputs are held when specified in the controller menu. To show16 English