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Analyze Detect Measure Control

Users Guide

Redox/ORP

Electrodes


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ROSS and the COIL trade dress are trademarks of Thermo Electron Corporation.

AQUAfast, Cahn, EZ Flash, Ionalyzer, ionplus, KNIpHE, No Cal, ORION, perpHect,

PerpHecT, PerpHecTion, pHISA, pHuture, Pure Water, Sage, Sensing the Future,SensorLink, ROSS Ultra, Sure-Flow, TEA Analyzer, Titrator PLUS, TURBO2 and Wine

Master are registered trademarks of Thermo.

1-888-pHAX-ION, A+, All in One, Aplus, AQUAsnap, AssuredAccuracy, AUTO-BAR,

AUTO-CAL, AUTO DISPENSER, Auto-ID, AUTO-LOG, AUTO-READ, AUTO-STIR,

Auto-Test, BOD AutoE Z, Cable-Free, CERTI-CAL, CISA, DataCOLLECT, DataPLUS,

digital LogR, DirectCal, DuraProbe, Environmental Product Authority, Extra

Easy/Extra Value, FAST QC, Flash Titration, Flash Titrator, GAP, GLPcal, GLPcheck,GLPdoc, ISEasy, KAP, LabConnect, LogR, Low Maintenance Triode, Minimum Stir

Requirement, MSR, NISS, One-Touch, One-Touch Calibration, One-Touch

Measurement, Optimum Results, Orion Constellation Software, Pentrode, pHuture

MMS, pHuture Pentrode, pHuture Quatrode, pHuture Triode, Quatrode, QuiKcheK,

rf link, ROSS, ROSS Resolution, SAOB, SMART AVERAGING, Smart CheK, SMART

STABILITY, Stacked, Stat Face, The Enhanced Lab, ThermaSense, Triode, TRIUMpH,

Unbreakable pH, Universal Access are trademarks of Thermo.

Guaranteed Success and The Technical Edge are service marks of Thermo.

PerpHecT meters are protected by U.S. patent 6,168,707.

PerpHecT ROSS are protected by U.S. patent 6,168,707.

ORION Series A meters and 900A printer are protected by U.S. patents 5,198,093,

D334,208 and D346,753.

ionplus electrodes and Optimum Results solutions are protected byUS Patent 5,830,338.

ROSS Ultra electrodes are protected by US patents 6,793,787.

Orion ORP Standard is protected by US Patent 6,350,367.

Orion NoCal electrodes with stabilized potential patent pending.

Copyright 2005, Thermo Electron Corporation. All rights reserved. Questioneverything, and Analyze.Detect.Measure.Control are trademarks of Thermo

Electron Corporation.

The specifications, descriptions, drawings, ordering information and part numbers

within this document are subject to change without notice.

This publication supersedes all previous publications on this subject.


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1Redox/ORP Electrode Manual

IntroductionThis manual contains instructions for the Orion Epoxy Sure-

Flow Combination Redox/ORP (9678BN), Glass Combination

Redox/ORP (9778BN), Epoxy Low Maintenance ORP Triode

(9179BN) and Epoxy Refillable ORP Triode (9180BN).

The Orion 9678BNWP and 9778BNWP combine a platinum

redox and a silver/silver chloride reference electrode in one

body. The Orion 9678BN is an epoxy body electrode with

a sleeve junction and the Orion 9778Bn has a glass body

with a ceramic junction. Both can be used to make direct

measurements of redox potentials or to perform potentiometric

titrations.

The Orion 9179BNMD and 9180BNMD consist of a platinum

redox sensor, a silver/silver chloride internal reference

system and a built-in thermistor for Automatic Temperature

Compensation (ATC). Orion 91-80 is a refillable electrode,

which uses Orion 900011 or 900001 filling solution. Orion 91-79

is a non-refillable, low maintenance gel-filled electrode. The

9179BNMD and 9180BNMD both have the capability to measureORP and Temperature simultaneously without a separate

reference electrode. Direct measurements of redox potentials or

potentiometric titrations can also be performed with these ORP

Triode electrodes.

Orion Orion

9179BNMD 9678BNWp


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2 Redox/ORP Electrode Manual

All of the Orion Redox/ORP electrodes are not designed for

amperometric or constant current titrations, such as Karl

Fischer analysis.

It is strongly recommended to use ORP standards,

Cat. No. 967901 or 967961, to ensure accurate measurements.

Required Equipment1. Orion pH/mV meter (i.e. Orion 3 Star pH, Orion 4 Star pH/

ISE meter, Orion 5 Star multi-parameter)

Orion 290A, 290Aplus, 410A, 410Aplus, 420A, 420Aplus,

520A,520Aplus, 525A, 525Aplus, 710A, 710Aplus, 920A,

920Aplus will need to have an ATC adapter if you use

Triodes otherwise the other ORPs are interchanged

on these meter.

2. Orion Redox/ORP electrode

Orion Epoxy Sure-Flow Combination Redox/ORP

(9678BNWP), Glass Combination Redox/ORP

(9778BNWP), Epoxy Low Maintanence ORP

Triode (9179BNMD) and Epoxy Refillable ORP Triode

(9180BNMD)

3. Solutions

Electrode Electrode Calibration Standard ISAFill Solution

9678BNWP 900001 or 900011 967901 or 967961 None Required

9778BNWP 900001 or 900011 967901 or 967961 None Required

9179BNMD None Required 967901 or 967961 None Required

9180BNMD 900011 967901 or 967961 None Required

4. ATC temperature probe

5. Magnetic stirrer or stir bars are highly recommended

6. Beakers

7. Distilled or Deionized Water


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Electrode Assembly and Preparation

Filling Instructions for Orion 9180BNMD,9778BNWOWP, 9678BNWP

1. Remove electrode protective cap and keep the cap for

storage.

2. Unplug the electrode fill hole cover on the electrode body.

3. Using the appropriate fill solution bottle, replace the flat

cap on the fill solution bottle with the flip-spout cap. Lift the

spout to the vertical position and insert into the fill hole.

4. Fill the electrode chamber up to a level just below the

fill hole.

5. Shake down the electrode as you would with a

thermometer to remove air bubbles.

6. After filling a dry chamber of Orion 9678BNWP (ONLY),

push cap and body together to leak some filling solution

past conical reference junction.

IMPORTANT:Do not place the electrode fill hole cover back

onto the electrode when making measurements!

Calibration Procedures

Manual ORP Calibration in Relative mV Mode:

The function of the relative mV mode is to calculate the mV

reading at a fixed user selected offset from absolute mV

measured from the Orion ORP electrode Orion 9179BNMD or

9180BNMD.

1. Set the meter to the relative millivolt mode. See Meter

Instruction Manual.

2. Place the ORP electrode in Orion ORP standard,

Orion 967901 or 967961.

Note:If using Orion 9180BNMD, make sure the proper filling

solution is used and filling instructions are followed.


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3. Calibrate the electrode by scrolling to the desired mV

value of the ORP solution. (mV values for EH are on the

bottle for Orion 967901 and see separate sheet for Orion

967961) See Meter Instruction Manual for more detailed

instructions.

4. Press YES key to accept value. All relative millivolt

measurements will be based on the offset value.

Note: If error message displays on main field, press MODE

key to abort calibration. See Troubleshooting Section in Meter

Instruction Manual.

ORP (EH) Autocalibration Procedure:

The function of the ORP mode is to calculate the equivalent

mV reading which would be read by a Standard Hydrogen

Electrode or Normal Hydrogen Electrode (NHE) at the measured

temperature using the measured input from the Orion ORP

electrode Orion 9179BNMD or 9180BNMD.

1. Press MODE key to set the meter to the EH mode. (First

time use of meter, dashes appear.)

2. Place the ORP electrode in Orion ORP standard, Orion

967901 or 967961.

Note: If using Orion 91-80, make sure the proper filling

solution is used and filling instructions are followed.

3. Press the 2nd key and then Cal key. When meter is ready,

the measured mV value which should be between the

range of +160 mV and +280 mV is displayed and converted

to the EH value.

Note: Error code E-21 will be displayed if mV is not

within this range. This error code is only a warning indicator.

Press MODE key to switch out of the ORP autocalibration

procedure to the mV mode. See Troubleshooting section.

4. Press YES key to accept the flashing EH value. Meter willautomatically switch back to the MEASURE mode.


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Important Measurement Techniques Stir all standards and samples at a uniform rate during

measurement.

Magnetic stirrers may generate sufficient heat to change

solution temperature. Place a piece of insulating material

such as cork, cardboard or styrofoam between the stir plate

and sample beaker.

Always use fresh ORP standards for calibration.

Always rinse electrode(s) with distilled water thoroughly

between measurements. Gently shake electrode afterrinsing to prevent solution carry-over, then blot dry with a

lint-free tissue.

Allow all standards and samples to come to room

temperature for precise measurements.

Make sure the electrode filling solution is appropriate foryour sample. See Electrode Assembly and Preparation.

Electrode MeasurementsDirect Redox Potential (ORP) measurements can be used to

determine the oxidizing or reducing capability of a solution andare commonly made in polluted streams, chlorinated waters,

industrial waste waters, and other water samples.

1. After setting up the meter and calibrating the electrode,

the electrode is ready for measurements. When the meter

switches back to the MEASURE mode or is in relative mV

mode, place the electrode in the sample solution.

2. When the reading stabilizes, record the potential reading

and the temperature.

Note: Like all platinum redox electrodes, Orions 9179BNMD

and 9180BNMD may give unstable readings in solutions

containing chromous, vanadous, titanous, and other ions that

are stronger reducing agents than hydrogen or platinum.

Note:When requiring a specific measurement method

other than Direct Measurement, please refer to

www.thermo/water.com (i.e. Oxidation Reduction Titrations).


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Electrode Maintenance

Orion 9179BNMD

This Low-Maintenance ORP TriodeTM electrode can be rinsed

off with distilled water from any salt build-up.

Orion 9180BNMD

This refillable ORP Triode electrode should be routinely cleaned.

To remove precipitate from outside wall or on electrode tip,

rinse with distilled water. Make sure that the filling solution does

not crystallize or dry out. If crystallized, run the electrode under

distilled water or wipe the vent hole area with a damp tissueand then fill with filling solution. Always keep the electrode fill

hole plug on to prevent salt build up while storing for a short

period of time up to one day. Fill hole must be open during

measurements.

Electrode Cleaning Procedures

Orion 9678BNWP Cleaning

The electrode can be routinely cleaned without disassembling.

To remove precipitate that forms on the outside wall or tip of

the electrode, rinse with distilled water. If sample or precipitate

clogs the space between the electrode sleeve and the innercone, clean the chamber by flushing out the fill solution. To do

this, invert the electrode to moisten the O-ring. Holding the

electrode by the cap with one hand, push the outer sleeve up

into the cap with the other hand, allowing the fill solution to

drain from the chamber. If the chamber is not completely clean,

repeat refill with the fill solution.

If the preceding directions fail to remove all the precipitate, the

electrode can be disassembled and cleaned using the following

procedure: This procedure is not recommended for routine

cleaning of the electrode and should be used only when

absolutely necessary.

1. Unscrew the cap and slide the cap and epoxy coated springup along the cable. See Figure 1.

2. Holding the outer sleeve with one hand, firmly push down

on the threaded portion of the inner body to separate the

inner body from the sleeve.


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3. Rinse the sleeve and the inner body thoroughly with

distilled water, and allow to air dry.

4. Moisten the O-ring on the electrode inner body with a drop

of fill solution. Reassemble and fill the electrode.

Changing the Fill SolutionThe electrode need not be disassembled to change the fill

solution in the reference chamber. Simply clean the electrode

and fill with the new solution, using the following procedure:

1. Tip the electrode to moisten the O-ring. Holding theelectrode by the cap with one hand, push the sleeve up into

the cap with the other hand allowing solution to drain from

the chamber.

2. Fill the electrode with distilled water and then drain the

reference chamber by retracting the sleeve, as explained

above. Now perform this filling and draining proceduretwice with the new filling solution.

3. Fill the electrode with new solution: Although the electrode

is ready for use, readings may drift slightly for about a half

hour while the electrode equilibrates with the new solution.

Orion 9778BNWP Cleaning

To remove precipate or salts that form on the exterior of the

electrode, rinse with distilled water. To remove salt deposits

formed inside the electrode:

1. Fill a wash bottle to half with distilled water.

2. Invert electrode so that glass membrane points up.

3. Invert the wash bottle so that its bottom points up.

4. Insert nozzle of wash bottle into electrode filling hole

and squeeze bottle. The fill solution will drain out ofthe chamber.

5. Fill chamber with distilled water from wash bottle.


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6. Continue to repeat steps 2-5 until all salts have been

removed.

To change the fill solution, follow steps 1-6 in cleaning above.

After draining out distilled water, fill with fill solution, drain, and

refill with the solution.

Orion 9179BN Cleaning

To remove precipitate or salts that form on the exterior of the

electrode, rinse with distilled water.

Orion 9180BN CleaningTo remove salt deposits formed inside the electrode, follow the

procedure below:

1. Fill a wash bottle to half with distilled water.

2. Invert electrode so that sensor points up.

3. Insert nozzle of wash bottle into electrode filling hole and

squeeze bottle.

4. Fill chamber with distilled water.

5. Take a 1 mL plastic disposable pipet and remove the liquidfrom the inverted electrode.

6. Repeat steps 2 to 4 until precipitate and deposits are

removed.

7. Rinse with fresh fill solution. Remove fill solution with pipet.

8. Fill with fresh fill solution.


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Electrode Storage

Short-term Storage (up to one day):

Electrodes may be kept in distilled water or air. If left in air,

remove salt crystals on the outside of the electrode sleeve by

rinsing with distilled water.

Long-term Storage (more than 24 hours):

For Orion 9179BNMD, rinse electrode, dry with lint-free tissues

or air dry, and replace with electrode protective cap. Store DRY.

For Orion 9180BNMD, 9678BNWP, 9778BNWP, remove saltcrystals on the outside of the electrode by rinsing with distilled

water, drain filling solution from chamber, flush out with

distilled water and store dry. See Cleaning Procedures. Replace

electrode protective caps to prevent sensor damage.

TroubleshootingThe most important principle in troubleshooting is to isolate

the components of the system and check each in turn. The

components of the system are: 1) Meter 2) Electrode(s)

3) Standard and 4) Sample.

Meter

The meter is the easiest component to eliminate as a possible

cause of error. Orion meters are provided with an instrument

checkout procedure in the instruction manual and a shorting

cap for convenience in troubleshooting. Consult the manual for

complete instructions and verify that the instrument operates as

indicated and is stable in all steps.

Electrode(s)

Rinse electrode(s) thoroughly with distilled water.

Place electrode in the ORP solution and wait until the readingstabilizes.

The potential reading should be 220 60 mV. If the mV is out

of range, use fresh standards. If the problem persists, consult

with the Thermo technical service department.


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Standard

The quality of results depends greatly upon the quality of the

standards. ALWAYS prepare fresh standards when problems

arise it could save hours of frustrating troubleshooting!

SampleIf the electrodes work properly in standards but not in the

sample, look for possible interferences, or substances that could

affect response or physically damage the sensing electrode or

the reference electrode. If possible, determine the composition

of the samples and check for problems.

AssistanceAfter troubleshooting all components of your measurement

system, contact The Technical EdgeSM for Orion products. Within

the United States call 1.800.225.1480, outside the United States

call 978.232.6000 or fax 978.232.6031. In Europe, the Middle

East and Africa, contact your local authorized dealer. For the

most current contact information, visit www.thermo.com/water.

Warranty

For the most current warranty information,visit www.thermo.com/water.


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Thermo Electron Corporation

Environmental Instruments

Water Analysis Instruments

166 Cummings Center

Beverly, MA 01915 USA

Tel: 978-232-6000

Toll Free: 800-225-1480

Dom. Fax: 978-232-6015

Intl. Fax: 978-232-6031

www.thermo.com/water

249306-001 Rev.A

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