Thermo Products 9678BNWP manual Troubleshooting, Meter, Electrode, Sample/Application, Technique

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Troubleshooting

Follow a systematic procedure to isolate the problem. The measuring system can be divided into four components for ease in troubleshooting: meter, electrode, sample/application

and technique.

Meter

The meter is the easiest component to eliminate as a possible cause of error. Thermo Scientific Orion meters include

an instrument checkout procedure and shorting cap for convenience in troubleshooting. Consult the pH meter user guide for directions.

Electrode

1.Thoroughly rinse the electrode with distilled water.

2.Place electrode in the Orion ORP standard and wait until the reading stabilizes.

3.The mV potential should be 220 mV ± 60 mV. If the mV reading is out of range, repeat the measurement with fresh ORP standard. If the electrode fails this procedure, clean the electrode thoroughly as directed in the Electrode Maintenance section. If the electrode response is slow or drifting and the electrode is refillable, drain and refill the electrode with fresh filling solution. Replace the electrode if cleaning and maintenance fail to rejuvenate it.

Sample/Application

The electrode and meter may operate with standards, but not with the sample. In this case, check the sample composition for interferences, incompatibilities or temperature effects.

Technique

If trouble persists, review operating procedures. Review calibration and measurement sections to be sure proper technique has been followed.

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Redox/ORP Electrode User Guide

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Contents User Guide Page Introduction Epoxy Refillable ORP/ATC Triode Cat. No Bnmd and 9180BNRequired Equipment Sample Requirements Electrode Preparation for Gel-Filled Electrodes Electrode PreparationElectrode Preparation for Refillable Electrodes Refillable ORP Electrode Electrode Calibration ORP Standard ValuesRedox/ORP Electrode User Guide Measurement Techniques Electrode Measurements Direct MeasurementsOxidation-Reduction Titrations References Typical Redox Titration Methods Unknown Interferences Suitable Titrants Titration Reaction Electrode Maintenance Cleaning Solutions Electrode Cleaning ProceduresGeneral Cleaning Sure-Flow Electrode Cleaning Cat. No Bnwp Disassembling the Sure-Flow ElectrodeElectrode Storage Short-term Storage up to one dayLong-term Storage over one day Reassembling the Sure-Flow ElectrodeTroubleshooting MeterElectrode Sample/ApplicationAssistance Warranty Checking Electrode OperationOrdering Information Thermo Fisher Scientific