Hach Lange ORBISPHERE 3100 Basic User Manual

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Hach Lange ORBISPHERE 3100 Basic User Manual Manual pdf 22 page image

3. Remove the holding screw from the flow chamber assembly.4. Holding the assembly between thumb and forefinger, gently ease it out of the instrument anddiscard.5. Replace the assembly with the new one from the maintenance kit, Put the new assembly back inplace in the instrument and secure with the holding screw. A guide rod is in place to ensurecorrect positioning.6. Replace the front guard and secure in place with the 2 screws underneath the instrument.7. After changing the spot, a sensor calibration must be performed before using the instrument formeasurement purposes.TroubleshootingMeasurementSymptom Possible solutionDisplay appears to be frozen - noactive cursorCheck measurement mode (continuous or sample)Display appears to be frozen outof rangeWhen “Out of Range”, measurement interval is 60 secondsDegassing in flow meter Adjust flow rate to between 150 and 200 mL/minVerify that the filter (if using) is not blockedMeasurement spiking Ensure all tubing is tightly and correctly connected to the sample inlet andoutlet connectionsRemove any residual air bubbles from the sample line by turning the sampleinlet/outlet valve to the PURGE position for 5 secondsResponse time too long Use tubes supplied with instrument (low O2 permeable material)Check flow rate and connectionsPrior to package sampling, purge the piercer with N2 gasPerform the monthly cleaning procedureChannel out Change LDO spotContact Hach Lange serviceSilver bead does not move freelyin the samplePerform the monthly cleaning procedureZero calibrationSymptom Possible solutionSignal not in range - calibrationvalue very different from lastcalibration valueOpen sample flow adjustment valve completelyCalibration gas has too much oxygen, use quality 50 N2 or CO2 bottleOxygen leaks between reference bottle and instrument. Can be checked byincreasing gas flow rate and checking partial pressure (mbar) decreaseStability not reached - signal notstableWait for stability and check N2 gas flow ratePresence of liquid on LDO membrane. Check presence of liquid in flowmeter and if so, dry by injecting 20 mL of EtOH then 5 minutes of N2 gas22 English