Emerson PN 51-1055pHC/rev.K ORP Calibration, Preparation of ORP standard solutions

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MODEL SOLU COMP II

SECTION 6.0

 

CALIBRATION

6.7 ORP CALIBRATION

6.7.1 Purpose

1.For process control, it is often important to make the measured ORP agree with the ORP of a standard solu- tion.

2.During calibration, the measured ORP is made equal to the ORP of a standard solution at a single point.

6.7.2 Preparation of ORP standard solutions

ASTM D1498-93 gives procedures for the preparation of iron (II) - iron (III) and quinhydrone ORP standards. The iron (II) - iron (III) standard is recommended. It is fairly easy to make, is not particularly hazardous, and has a shelf life of about one year. In contrast, quinhydrone standards contain toxic quinhydrone and have only an eight-hour shelf life.

Iron (II) - iron (III) standard is available from Rosemount Analytical as PN R508-16OZ. The ORP of the standard solution measured against a silver-silver chloride reference electrode is 476±20mVdc at 25°C. The redox poten- tial is -476±20mVdc at 25°C.

6.7.3 Procedure

Calibrate

Hold

Program

Display

 

 

 

 

Calibrate?

 

Sensor1

Sensor2

 

 

 

 

CalSensor1?

 

Measurement

Temp

 

 

 

 

Live

600mV

CalS1

+0000mV

 

 

1.Press MENU. The main menu screen appears. Choose Calibrate.

2.Choose Sensor1 (ORP sensor).

3.Choose Measurement.

4.The top line shows the actual ORP or redox potential (S1Live). Once the reading is stable, change the number in the second line to the desired value. Press ENTER.

5.The display returns to the screen in step 2. Choosing Sensor2 will per- mit the conductivity measurement to be calibrated.

6. To return to the main display, press MENU followed by EXIT.

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Contents Model Solu Comp Essential Instructions Quick Start Guide ORP Quick Reference Guide Model Solu Comp List of Tables Table of Contents CONT’DIii List of FiguresAbout This Document Section Description and Specifications Ordinary Location -68 only DimensionsTerminal Connections Rating 26-14 AWG wire size Hazardous LocationRange, µS/cm Cell constant, /cm Performance SpecificationsAnalyzer Conductivity Input Recommended Sensors for ConductivityMeasurement Range see table below Toroidal Conductivity Codes -21 and/orRecommended Sensors for ORP Performance Specifications Analyzer ORP InputTemperature Correction none required When used with conductivity -20-32 orRecommended Sensors Frequency Range 0.5 4000 HzRepeatability ±1% Measurement Range 0-10 ppm mg/L Loop Specifications with a Model 499A OZ SensorRecommended Sensor Input filter 1- 255 samplesModel 1055 Solu Comp II Analyzer Ordering InformationCombination Guide Part Number Description Weight General Information Section InstallationInstallation Unpacking and InspectionPanel Mounting Panel Mount InstallationPipe Mounting Pipe Mount InstallationSurface Mounting Surface Mount InstallationSection Wiring POWER, ALARM, OUTPUT, and Sensor ConnectionsPreparing Conduit Openings Model Solu Comp Section Wiring Model Solu Comp Section Wiring 41055105 41055106 41055107 41055108 41055109 41055110 40105536 40105559 Section Display and Operation DisplayKeypad Programming and Calibrating the Solu Comp II Tutorial Security Using HoldSection Programming the Analyzer Sensors Output Section Default SettingsOutput Dampening Or 4 mA Mode Section Alarm SectionDefault Settings Assigning Outputs 1 DefinitionsChoose Output Range. Choose Output1 or Output2 Choose Output ConfigureChoose Output1 or Output2 Choose 4-20 mA or 0-20 mAAlarm Relays Must be Configured Before Assigning Setpoints Choose Measurement or Temp Choose Alarm ConfigureChoose Alarm Setpoints Definitions pH/ORP Definitions conductivity/resistivity Choose Soln Temp Corr or Sensor Isoptntl Choose MeasurementDefinitions pH OutputsAlarms Measurement Choose Noise Rejection Choose ResetAnalyzer Choose Default Display Procedure Choosing a LanguageProcedure Changing Screen Contrast Introduction Section CalibrationCalibrating Temperature Procedure Calibration Slope and Offset PH at 25C Standards Nominal pHEnter Choose Measurement Choose BufferCalManual Calibration pH S1ManualCal? Choose Measurement Choose Standardize Standardization pHEntering a Known Slope Value pH ORP Calibration Preparation of ORP standard solutionsProcedure-Calibration against a standard meter and cell Calibrating AN IN-SERVICE Sensor ConductivityChoose Measurement Choose InProcess Procedure-Calibration against a standard solution ProgramDisplay Calibrate? Choose Measurement Choose CellConst Placing a NEW Sensor in Service ConductivityCell constant Conductivity µS/cm Resistor k Ω Calibrating the Analyzer ConductivityTo Reset the Factory Resistance CALIBRATION, see Section Model Description See Figure Section MaintenanceReplacement Parts OverviewExploded View of Solu Comp II Panel Mount Version Exploded View of Solu Comp II Pipe/Surface Mount Version Absolute Value of Measured Voltage Exceeds 2500 mV Section TroubleshootingOverview Troubleshooting Using Fault Codes Simulating Inputs Conductivity Simulating TemperatureEeprom Failure PH Sensitive Glass Membrane is BrokenConductivity Sensor Open or Shorted RTD Sense Line for Sensor 1 or Sensor 2 is OpenCalibration Error During Two-Point Calibration Problem See SectionCalibration Error during Standardization Invalid Input While Manually Entering SlopeSensor Does Not Respond to Known pH Changes Model Solu Comp Section Troubleshooting Calibration Error Using Standard Resistors Current Output Too Low Alarm Relays Do Not WorkMeasurement seems wrong Conductivity, µS/cm Cell constant, /cmSimulating pH input when the preamplifier is in the sensor GeneralPreamplifier is in the Sensor Simulating Inputs Conductivity Set the temperature correction to raw SectionThree-Wire RTD Configuration Simulating temperatureChecking for a Poisoned Reference Electrode Measuring Reference VoltageGeneral Warranty RepairNON-WARRANTY Repair Section Return of MaterialWarranty Specifications subject to change without notice

PN 51-1055pHC/rev.K specifications

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