AMU pH/RedoxVersion 3.50 and laterA-96.250.441 / 060923O p e r a t o r ’s M a n u a lSWAN sets the StandardCustomer SupportSWAN and its representatives maintain a fully trained staff of technical specialists around the world. For any technical question, contact your nearestSWAN representative, or the manufacturer:SWAN ANALYTISCHE INSTRUMENTE AGTuricaphonstrasse 298616 RiedikonSwitzerlandInternet: www.swan.chE-mail: support@swan.chDocument StatusTitle:AMU pH/Redox Operator’s ManualID:A-96.250.441Revision Issue00September 2006© 2006, SWAN ANALYTISCHE INSTRUMENTE AG, Switzerland, all rights reserved Information contained in this document is subject to change without notice.AMU pH-RedoxAMU pH-RedoxA-96.250.441 / 0609231AMU pH-RedoxTable of Contents1.Safety Instructions1.1Warning Notices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.2General Safety Regulations. . . . . . . . . . . . . . . . . . . . . . .42.Product Description2.1Description of the System . . . . . . . . . . . . . . . . . . . . . . . . 52.2Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.3Swansensor pH and Redox. . . . . . . . . . . . . . . . . . . . . . . 82.4Swansensor pH AY and Redox AY . . . . . . . . . . . . . . . . . 82.5Swansensor pH SI and Redox SI . . . . . . . . . . . . . . . . . . 82.6Swansensor pH FL and Redox FL. . . . . . . . . . . . . . . . . . 82.7Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92.7.1Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92.7.2Menu Navigation Keys. . . . . . . . . . . . . . . . . . . . . . . . . 102.7.3Software Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . .113.Installation3.1Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123.2Mounting of the Instrument . . . . . . . . . . . . . . . . . . . . . . . 133.3Connection Schemes. . . . . . . . . . . . . . . . . . . . . . . . . . . . 143.4Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163.5Relay Contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163.5.1Alarm Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163.5.2Relay Contacts 1 and 2 . . . . . . . . . . . . . . . . . . . . . . . . 163.6Signal Outputs1 and 2. . . . . . . . . . . . . . . . . . . . . . . . . . . 163.7Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163.8Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173.9Installation of Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . 173.10Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193.10.1RS232 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193.10.2Profibus (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . .19AMU pH-RedoxAMU pH-Redox2A-96.250.441 / 0609234.Instrument Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215.Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216.Maintenance (Quality assurance)6.1Maintenance Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226.2Cleaning of Electrodes. . . . . . . . . . . . . . . . . . . . . . . . . . . 236.3Longer stop of operation . . . . . . . . . . . . . . . . . . . . . . . 246.4Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .258.Trouble Shooting8.1Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278.2Error List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28A.AppendixA.1Program Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30A.2Program List and Explanations . . . . . . . . . . . . . . . . . . . . 33Default Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50B.Material Safety Data SheetsB.1Buffer pH 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53B.2Buffer pH 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56B.3Buffer pH 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59B.4Buffer ORP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62C.RS232 InterfaceC.1Connection of the Communication Cable. . . . . . . . . . . . . 66C.2Configuration of the AMU Transmitter . . . . . . . . . . . . . . . 67C.3HyperTerminal Configuration on the PC . . . . . . . . . . . . . 68C.4Functions of the AMU RS232 Interface . . . . . . . . . . . . . . 72C.4.1Logger Download. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72C.4.2Log download . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73C.4.3Clear Logger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75C.5Firmware Upload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76D.Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78AMU pH-RedoxSafety InstructionsA-96.250.441 / 06092331.Safety InstructionsGeneralThe instructions included in this section explain the potential risks associated with instrument operation and provide important safety practices designed to minimize these risks.If you carefully follow the information contained in this section, you can protect yourself from hazards and create a safer work environment.More safety instructions are given throughout this manual, at the respective locations where observation is most important.Strictly follow all safety instructions in this publication.Target audienceOperator:Qualified person who uses the equipment for its intended purpose.Instrument operation requires thorough knowledge of applications, instrument functions and software program as well as all applicable safety rules and regulations.Operator’s Manual Loca-tionThe AMU Operator’s Manual shall be kept in proximity of the instrument.1.1Warning NoticesThe symbols used for safety-related notices have the following significance:WARNING SymbolsWARNINGGenerally, the triangular warning symbol indicates the possibility of personal injury or even loss of life if instructions are not followed, e.g.electrical shock hazardATTENTION SymbolsATTENTIONThe attention symbol indicates the possibility of equipmentdamage, malfunctions or incorrect process results if instructions are not followed.AMU pH-RedoxSafety Instructions4A-96.250.441 / 0609231.2General Safety RegulationsLegalRequirements The user is responsible for proper system operation according to all local, state and federal laws that may apply. All precautions must be followed to ensure safe operation of the instrument.Spare PartsandDisposables Use only official SWAN spare parts and disposables. If other parts are used during the normal warranty period, the manufacturer’s warranty is voided.ModificationsModifications and instrument upgrades shall only be carried out by an authorized Service Technician. SWAN will not acceptresponsibility for any claim resulting from unauthorized modification or alteration.Electrical shock hazardWARNINGIf proper operation is no longer possible, the instrument must be disconnected from all power lines, and measures must be taken to prevent inadvertent operation. To prevent from electrical shock, always make sure thatthe ground wire is connected.Service shall be performed by authorized personnelonly.Whenever electronic service is required, disconnectinstrument power and power of devices connected to•relay 1,•relay 2,•alarm relay.AMU pH-RedoxProduct DescriptionA-96.250.441 / 06092352.Product Description2.1Description of the SystemThis instrument is applicable for the measurement of the pH respectively ORP value in water.ApplicationrangepH and redox (ORP) is measured in many different applications: swimming pools waste waterhigh purity waterpower plants (steam, condensate) industryDepending on the application, different electrode types and flow cells/fittings are needed.Measuring PrinciplepH: The electrode consists of a pH sensitive glass electrode and a reference electrode = measuring chain. Depending on the pH value in the water, the mV value of the measuring chain changes. If both electrodes are integrated into one shaft it is a combined electrode. Reference electrodes are available with gel (Swansensor pH for potable water and swimming pools, Swansensor pH AY for waste water) or with liquid electrolyte (Swansensor pH SI for power plant cycle, Swansensor pH FL for high purity water).ORP: The electrode consists of a platinum pin and a reference electrode = measuring chain. Depending on the ORP value in the water, the mV value of the measuring chain changes. If bothelectrodes are integrated into one shaft it is a combined electrode. Reference electrodes are available with gel (Swansensor pH for potable water and swimming pools, Swansensor pH AY for waste water) or with liquid electrolyte (Swansensor ORP SI for power plant cycle, Swansensor ORP FL for high purity water).Temperature compensationpH: The pH value depends on temperature. If the temperature of the sample is not stable, we recommend to install a temperature sensor. If no temperature sensor is chosen, please program the temperature of the sample in the instrument.For high purity water applications (power plant, high purity water): Additionally to the Nernst compensation a non-linear solution compensation or linear compensation with coefficient can be chosen.ORP: Temperature compensation is not necessary.AMU pH-RedoxProduct Description6A-96.250.441 / 0609232.2Technical DataThe AMU measuring and control transmitter is used for panel installation. It has connections for a pH/ORP electrode and a Pt1000 temperature probe, and for a digital sample flow meter.Electronics case: Noryl® resinProtection degree: IP54 (front)Large backlit LC-Display,75 x 45mmDimensions: 96 x 96 x 119mm (DIN 43700)Weight: 0.45kgAmbient temperature: -10 to +50°C Limit range of operation:25 to +65°C Storage and transport: -30 to +85°C Humidity: 10 to 90% relative, non-condensing Voltage: 85 - 265 VAC, 47 - 63 Hz, or 24 VDC ±15%Power consumption:max. 7 VA Measuring rangeResolution0.00 to 14.00 pH Resolution: 0.01 pH -500 to 1500 mV Resolution: 1 mV Automatic range switching.TemperatureInput for Pt1000 type sensor (DIN class A)Measuring range: -30 to +250°C Resolution: 0.1°CTemperature compensationNernstNon-linear solution compensation for high purity water Linear with coefficient for high purity waterAMU pH-RedoxProduct DescriptionA-96.250.441 / 0609237Temperature monitoringAlarm if the transmitter temperature is higher than +65°C or lower than 0°C.Safety features No data loss after power failure, all data is saved in non-volatile memory. Over voltage protection of in- and outputs.Galvanic separation of measuring inputs and signal outputs.Alarm RelayOne potential free contact for summary alarm indication for programmable alarm values and instrument faults.Maximum load: 100mA / 50 VInput One input for potential-free contact. Programmable ‘HOLD’ or ‘OFF’ function.RelaysTwo potential-free contacts programmable as • limit switches for measuring values • controllers• timer for system cleaning with automatic hold function Maximum load: 100 mA / 50 VSignal OutputsTwo programmable signal outputs for measured values(freely scaleable, linear or bilinear) or as continuous control output (control parameters programmable).Current loop: 0/4 - 20 mA Maximum burden: 510 ΩControl Function Relays or current outputs programmable for 1 or 2 pulse dosing pumps, solenoid valves or for one motor valve. Programmable P , PI, PID or PD control parameters.Communica-tion InterfaceOptional RS485 interface with Fieldbus protocol PROFIBUS DP or Modbus, galvanically separated.Serial InterfaceRS232 for data logger download to PC with Microsoft HyperTerminal and for Firmware updates.AMU pH-RedoxProduct Description8A-96.250.441 / 0609232.3Swansensor pH and RedoxApplicationsPotable waterSwimming pools Details see data sheet.Operating Conditions0 to 50 °CMax. pressure: < 2 bar2.4Swansensor pH AY and Redox AYApplicationsWaste water Details see data sheet.Operating Conditions0 to 50 °CMax. pressure: < 2 bar2.5Swansensor pH SI and Redox SIApplicationsPower plant cycle Details see data sheet.Operating Conditions0 to 50 °C Pressure-freeFlow speed: 5 to 10 l/h2.6Swansensor pH FL and Redox FLApplicationsHigh purity water Details see data sheetOperating Conditions0 to 50 °C Pressure-freeFlow speed: 5 to 10 l/hProduct Description2.7Software2.7.1DisplayMenu navigation keys°CStatusblinking: fatal errorerrorupper / lower limit reachedupper / lower limit not yet reached control upw. / dnw.: no actioncontrol upw. / dnw.: active, dark bar indicates control intensity timertimer: timing active (hand rotating)Relay Statussample temperaturesample flowmotor valve: valve closedmotor valve: open, dark bar indicates approximate position 25TimeR1R28 l /h7.43 p ΗHOLD The Input is activated. The Signal Outputs are frozen.OFFThe Input is activated; the Signal Outputs are set to 0 (0/4 mA)RUN normal operationProduct Description2.7.2Menu Navigation KeysKeysProgram NavigationFor a detailed listing of the menu see Program Overview, p. 30to exit a menu or command (without accepting)to move back to the previous menu level to move DOWN in a menu list and to decrease digitsto move UP in a menu list and to increase digitsto open a selected sub-menu to confirm an entryExitEnterEnterExit25.0°CRUN14:10:45R1x pHR21InstallationOperation Diagnostics Maintenance Main MenuProduct Description2.7.3Software Structure1Messages Operation Maintenance Diagnostics Main Menu Menu Operation 4Subset of menuInstallation 5, but process-related. User relevant parameters that might need to be modified during daily routine. Normally password protected and used by the process-operator.Menu Messages 1Reveals pending errors as well as an event history (time and state of events that have occured at an earlier point in time).Menu Diagnostics 2Provides user relevant instrument and sample data.Menu Installation 5For initial instrument set up by SWAN authorized person, to set allinstrument parameters. Normally password protected.Menu Maintenance 3For instrument calibration, relay and signal output simulation and to set the instrument time. It is used by the service personnel.Installation1.1Message ListMessages 2.1InterfaceI/O State Sample Sensors Diagnostics 3.1SimulationMaintenanceSet Time 02.04.05 16:49:304.1LoggerRelay Contacts Operation 5.1InterfaceMiscellaneous Relay Contacts Signal Outputs InstallationInstallation3.Installation3.1Installation ChecklistCheck Instrument’s specification must conform to yourpower ratings.Installation Mount the instrument in vertical position. Displayshould be at eye level.Electrical Wiring Connect all external devices like limit switches and current loops.Connect power cord; do NOT switch on power yet!Flow cell / fitting Install flow cell / fitting.Flow cell: Ensure outlet is pressure-free.Electrode Remove protective cap. Install in flow cell/fitting.Remove plug cap. Connect the sensor(s) to theAMU transmitter. Store sensor caps for interrup-tion of operation.QV-flow: Install reference in the hole near thepanel.Fitting: Ensure fitting is water-tight.Power up Flow cell: Turn on sample flow and wait until it iscompletely filled. Switch on power.Instrument setup Flow cell: Adjust sample flow.Program all parameters for sensor and external devices(interface, recorders, etc.). Program all parame-ters for instrument operation (limits, alarms).Run-in period Let the instrument run continuously for 1 h. pH electrodecalibrationCalibrate pH electrode.ORP in potable/waste waterCalibrate ORP electrode.ORP in high purity water: Process calibration Let the electrode run in for at least 24 h.Make a valid manual measurement with a suitable ORP electrode. Compare this value to the value, indicated by the AMU. If necessary, correct.Installation3.2Mounting of the InstrumentStandard housing according to DIN 43700: 96 x 96 x 119 mmInstallation3.3Connection Schemes ArrayRear viewInstallationThe type plate for theproduct identification is on the back side of the AMU transmitter.11.431.102pH / RedoxInstallation3.4Power SupplyPower Supply ConnectorNeutralPower3.5Relay Contacts3.5.1Alarm RelayNote: Max. load 100mA / 50 VTerminal 5/63.5.2Relay Contacts 1 and 2Note: Max. load 100mA / 50 VRelay 1: Terminal 1/2Relay 2: Terminal 3/43.6Signal Outputs1 and 2Note:Max. burden 510 ΩIf signals are sent to two different receivers,use signal isolator (loop isolator).Signal Output 1: Terminal 13 (+) and 12 (-)Signal Output 2: Terminal 14 (+) and 12 (-)Current loop: 0 - 20 mA resp. 4 - 20 mA3.7InputUse only potential-free (dry contacts).Terminal: 11/10Installation3.8SensorConnect the sensor as follows:pH / ORP Sensor:Terminal 21: shielded lineTerminal 22: shieldExternal reference sensor:Terminal 23: shielded lineTerminal 24: shieldTemperature sensor Pt1000:Terminal 20: shielded lineTerminal 19: shield3.9Installation of SensorsFlow cell M-Flow Cautiously pull off rubber cap from pH/ORP electrode tip. Fragile! Handle with care!Insert pH/ORP electrode into one of the PG threads and fasten hand-tight.Take off plug cap. Connect to sensor cable.Store the plug and rubber cap for interruptions of operation.The temperature sensor is already mounted and connected to the cable.Flow cell QV-Flow We recommend to mount the pH/ORP SI respectively Reference FL electrode in the insert near the panel. Flow cell, view from aboveElectrode Cautiously pull off rubber cap from pH/ORP electrode tip.Insert pH/ORP electrode into the opening (see above) and fastenhand-tight.Take off plug cap. Connect to sensor cable.Store the plug and rubber cap for interruptions of operation.InstallationTemp. sensor The sensor is already mounted and connected to the cable.Reference electrode The reference electrode (Swansensor pH SI, Swansensor ORP SI, Swansensor FL) is delivered with an electrolyte tube, which is alreadymounted and filled. The sealed electrolyte bottle is also included in delivery.- Cautiusly take of the rubber cap from electrode tip. Make sure that the black cap at the tip of the electrode is fastened hand-tight.- The reference electrode has to be free of air bubbles: Hold the electrode, tip downwards, in one hand and hold the electrolyte tube with the other hand straight above the the electrode. Shake theelectrode slightly in an angular position to release air, which might be inside. Release air bubbles in the electrolyte tube by knocking on it.- Insert the electrode into the flow cell and fasten hand-tight.- Cut off the tip of the electrolyte bottle. Take the plug out of the electrolyte tube. Put the electrolyte bottle firmly on the tube.- Mount the electrolyte bottle in the click holder (see 2.3 Instrument overview, p. 11).- Puncture the electrolyte bottle to allow pressure equilibration.- Take off plug cap. Connect to sensor cable. Store caps.UNIDIP fitting Please refer to the manual of the UNIDIP fitting how to install the pH/ORP electrode and the temperature sensor in detail. Ensure that all sur-faces and o-rings are clean. If mounted correctly, the UNIDIP fitting is tight. No water is allowed inside the UNIDIP fitting. Otherwise the cables corrode. If you use an UNIDIP Rinsematic, make sure the nozzles face the pH/ORP sensor.Temperature sensor and electrodes: Fragile! Handle with care!Installation3.10Interfaces3.10.1RS232The interface RS232 is on the backside ofthe AMU transmitter.For connecting the communication cable and the configuration(using RS232 for data logger download to PC and for firmwareupdates) see RS232 Interface, p. 663.10.2Profibus (optional)The interface RS485,galvanically separated.To connect several instruments by means of a network, use a free-cable end PROFIBUS cable. See picture below.InstallationPlease buy a free-cable end PROFIBUS cable from your local supplier.NOTE: The color of the wires might be different. Before connecting it to the transmitter, please check the corresponding data sheet.The PROFIBUS connections have to be short-circuited.The shield has the function to change or replace the transmitter without inactivating the bus connection.NOTE: Terminate bus by means of ON/OFF switch on the RS485interface only. If only one instrument is installed, or on the last instrument in a bus, the termination switch must be ON .terminationswitchInstrument Setup4.Instrument SetupSensor Check if:Power is availableSensor is installed and connected correctly.For connecting the sensor to the transmitter, see Swansensor pHand Redox, p. 8Establish Sample Flow 1Check if sample is available.2Assure pressure-free sample outflow.3Open sample flow. (Wait until flow cell is completely filled.) 4If applicable, check flow cell for leaks.5Connect the instrument to power.6Adjust sample flow.7Set all necessary parameters in Installation, Sensors 5.1.- Flow: Set if you use the Q-flow cell (with Swan flow meter)- Parameter: Set measuring parameter pH or ORPSensor check: No.- Temperature: Set if a temperature sensor has been connected.If no, program the temperature of the sample (default temp.)If yes, you can set a temp. correction, if necessary.- Temperature compensation: Only for pH, not for ORP.- Standard solution(s): Program the buffer values (pH buffer table)or the ORP calibration solution.8Program all parameters for external devices (interface,recorders, etc.). Program all parameters for instrumentoperation (limits, alarms, etc.)9Let run in for 1 h. Correct if necessary, or calibrate. SeeInstallation check list.5.OperationTo have a general survey of the menu 4: Operation, see ProgramOverview, p. 30. For explanations see Program list andexplanations.You can modify:The Filter Time Constant and the time for Hold after Calibration for the sensorThe Settings for the Relay Contacts and the Input.Maintenance (Quality assurance)6.Maintenance (Quality assurance)This section describes the activities intended to retain theinstrument in, or to restore it to a state in which it maintains the required or specified performance.6.1Maintenance TableSwansensor pH / Swansensor Redox (ORP)Swansensor pH AY / Swansensor Redox (ORP) AYSwansensor pH SI or FLSwansensor Redox (ORP) SI or FLTwice per month Calibrate electrode. Ensure buffers are not expired. If necessary, replace electrode.YearlyIf necessary, clean electrode.Twice per month Clean electrode.MonthlyCalibrate electrode. Ensure buffers are not expired. If necessary, replace electrode.Weekly Check level in electrolyte bottle. If necessary, change bot-tle.Monthly Calibrate electrode.All 3 monthsOpen cap of reference electrode slightly and let flow out 5 ml of electrolyte. Fasten cap hand-tight.Weekly Check level in electrolyte bottle. If necessary, change bot-tle.Monthly If necessary, correct electrode.All 3 monthsOpen cap of reference electrode slightly and let flow out 5 ml of electrolyte. Fasten cap hand-tight.Maintenance (Quality assurance)6.2Cleaning of ElectrodesCleaningSwansensor pH and pH AYTake the electrode out of the flow cell. If necessary wipe the electrode shaft and the green tip cautiously with a soft, clean, and damp papertissue.Remove grease with a tissue moistured with alcohol (caution! Inflammable!).If the electrode is very dirty, put it into 1% diluted hydrochloric acid for roughly 1 min. Caution! Etching!!Afterwards rinse the electrode thoroughly with clean water.Remount in the flow cell again.Let the electrode run-in for 1 h before the first calibration.Swansensor ORP and ORP AY Take the electrode out of the flow cell. If necessary, wipe off dirt cautiously with a soft, clean, and damp paper tissue.Dull platinum surfaces indicate a contamination. Clean the electrode byputting it into the calibration solution or in 1% diluted hydrochloric acid for some minutes. Caution! Both solutions are etching!Afterwards rinse the electrode thoroughly with clean water.Remount in the flow cell again.Let the electrode run-in for 1 h before the first calibration.Swansensor pH SI and pH FL If necessary, wipe the green tip of the electrode cautiously with a soft, clean, and damp paper tissue. If necessary, remove grease with atissue, moistured with alcolhol (Caution! Inflammable!). Do not insertinto acidsReference electrode: Open the cap (diaphragm) at the tip of theelectrode slightly and let flow out some ml of electrolyte. Caution! KCL is corrosive! Fasten cap hand-tight again.Afterwards rinse the electrode thoroughly with high purity water.Remount in the flow cell again.Let the electrode run-in for 1 h before the first calibration.Swansensor ORP SI and ORP FL If necessary, wipe the tip of the electrode cautiously with a soft, clean, and damp paper tissue. Do not insert into acidsReference electrode: Open the cap (diaphragm) at the tip of theelectrode slightly and let flow out some ml of electrolyte. Caution! KCL is corrosive! Fasten cap hand-tight again.Afterwards rinse the electrode thoroughly with high purtiy water.Remount in the flow cell again.Let the electrode run-in for at least 24 h before the first correction.6.3Longer stop of operationStop sample flow.Shut off power of the instrument.Take off the cable of the electrode(s) and put the plug cap on it.Take the electrode(s) out of the flow cell/fitting and rinse with cleanwater. Fill 3.5 molar KCl (if not available: water) into the rubber capand place it on the tip of the electrode. Never store combined pH/ORP electrodes, respectively reference electrode, dry!Store the electrode(s) with tip pointing downwards in a frost-protected room.Maintenance (Quality assurance)6.4CalibrationProcess pH /ORP Use a suitable, high quality electrode and instrument to determine thesample value. Ensure, the electrode is calibrated correctly! Enterthis value under Process value in menu Process pH/ORP .Possible er-ror message Offset error:Last calibration wrong.Electrode old or dirty.Cable wet.EnterProcess pH Current Value 7.78 pH Offset x mV Save<Enter>Process Value 7.70 pH 3.1.1.13.1.1.1Process pH Current Value 7.70 pH Offsety mVpressEnter3.1.1.1Process pH Current Value 7.70 pH Offset y mV Process Value 7.70 pH EnterProcess pH Offset x mV Save <Enter>3.1.1.1EnterCurrent Value 7.78 pH 3.1SimulationMaintenanceSet Time 01.01.05 16:30:003.1.1Standard pHCalibration EnterEnter correct value with arrow keys.。
