Thermo Products 9678BNWP manual Measurement Techniques

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Measurement Techniques

Always use fresh ORP standard for calibration.

If the electrode is refillable, remove the filling hole cover during measurements to ensure a uniform flow of filling solution.

Between measurements, thoroughly rinse the electrode with distilled water. Gently shake the electrode after rinsing to prevent solution carryover and then blot the electrode dry with a lint-free tissue.

Stir all standards and samples at a uniform rate.

Place a piece of insulating material, such as Styrofoam or cardboard, between the magnetic stirrer and beaker to prevent measurement errors from the transfer of heat to the sample.

Allow all standards and samples to come to room temperature for precise measurements.

If the electrode is used in dirty or viscous samples or the electrode response becomes sluggish, empty the electrode completely and hold the junction under running water. Empty any water from the electrode and refill it with fresh electrode filling solution.

If a Sure-Flow electrode is used in dirty or viscous samples or the electrode response becomes sluggish, empty the electrode completely and hold the junction open under running water. Empty any water from the electrode and refill it with fresh electrode filling solution. Press down on the electrode cap to let a few drops of the filling solution flow out of the electrode and then replenish any lost solution.

Make sure the electrode filling solution is appropriate for the sample. Use Cat. No. 900011 filling solution for samples that have a total ionic strength greater than 0.2 M. Use Cat. No. 900001 filling solution for samples that have a total ionic strength less than 0.2 M.



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 Refillable Electrodes Electrode PreparationElectrode Preparation for Gel-Filled 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 General Cleaning Electrode Cleaning ProceduresCleaning Solutions Sure-Flow Electrode Cleaning Cat. No Bnwp Disassembling the Sure-Flow ElectrodeLong-term Storage over one day Electrode StorageShort-term Storage up to one day Reassembling the Sure-Flow ElectrodeElectrode TroubleshootingMeter Sample/ApplicationAssistance Warranty Checking Electrode OperationOrdering Information Thermo Fisher Scientific