Emerson PN 51-1055pHC/rev.K instruction manual Purpose, Definitions pH/ORP

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MODEL SOLU COMP II

SECTION 5.0

 

PROGRAMMING THE ANALYZER

5.5SELECTING THE TYPE OF MEASUREMENT AND ACTIVATING SOLUTION TEMPERATURE CORRECTIONS

5.5.1 Purpose

This section describes how to do the following:

1.Program the Solu Comp II to measure pH, ORP, redox potential, conductivity, resistivity, or total dissolved solids.

2.Enable or disable glass impedance fault.

3.Select a solution temperature correction for pH.

4.Change the analyzer pH isopotential point.

5.Select a solution temperature correction for conductivity.

5.5.2 Definitions — pH/ORP

1.ORP. ORP is oxidation-reduction potential. It is the voltage difference between a noble metal (usually plat- inum) indicator electrode and a silver/silver chloride reference electrode.

2.REDOX. Redox is redox potential. Redox potential is measured the same way as ORP. The sign of the redox potential is the negative of ORP.

3.SIGN CONVENTION. The ORP of a solution of 0.1 M iron (II) ammonium sulfate and 0.1 M iron (III) ammoni- um sulfate in 1 M sulfuric acid is positive. The redox potential is negative.

4.GLASS IMPEDANCE FAULT. The Solu comp II can be used with pH sensors having advanced diagnostic fea- tures, which permit the continuous determination of glass and reference electrode impedance. When the ana- lyzer detects low glass impedance, indicating a broken or cracked glass membrane, it automatically displays a fault message. If the Solu Comp II is to be used with non-glass pH electrodes, the glass impedance fault should be disabled.

5.SOLUTION TEMPERATURE CORRECTION. The pH of a solution, particularly an alkaline one, is a function of temperature. If the temperature changes, so does the pH, even though the concentration of the acid or base causing the pH remains constant. Solution temperature compensation converts the pH at the measurement temperature to the pH at a reference temperature. The Solu Comp II corrects the pH to a reference tempera- ture of 25°C.

For an accurate solution temperature correction, the exact composition of the solution must be known. The Solu Comp II has built-in temperature corrections for high purity water and for dilute solutions of a strong base. The analyzer also accepts a custom correction.

6.CUSTOM TEMPERATURE CORRECTION. The custom temperature correction has units of ∆pH/°C. The example shows how the analyzer uses the custom correction. Suppose the pH of the solution being measured decreases 0.022 units for every Celsius degree rise in temperature. The temperature correction is - 0.022pH/°C. If the pH at 20°C is 8.95, the corrected pH (at 25°C) is 8.95 + (-0.022)(25 - 20) or 8.84.

7.ISOPOTENTIAL pH. The isopotential pH is the pH at which the cell voltage (the cell is the pH electrode, ref- erence electrode, and solution being measured) is independent of temperature. Most pH cells have isopoten- tial pH reasonably close to 7.00, so the Solu Comp II assumes the cell isopotential pH is 7.00. However, cer- tain specialized electrodes have isopotential pH different from 7.00.

NOTE

Do NOT change the isopotential pH of the transmitter unless you are thoroughly familiar with the role of sensor and analyzer isopotential point in pH measure- ment, OR the sensor operating instructions specifically state the isopotential pH is a value other than pH 7.00.

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Contents Model Solu Comp Essential Instructions Quick Start Guide ORP Quick Reference Guide Model Solu Comp Table of Contents CONT’D List of TablesList of Figures IiiAbout This Document Section Description and Specifications Hazardous Location DimensionsTerminal Connections Rating 26-14 AWG wire size Ordinary Location -68 onlyRecommended Sensors for Conductivity Performance SpecificationsAnalyzer Conductivity Input Range, µS/cm Cell constant, /cmToroidal Conductivity Codes -21 and/or Measurement Range see table belowWhen used with conductivity -20-32 or Performance Specifications Analyzer ORP InputTemperature Correction none required Recommended Sensors for ORPFrequency Range 0.5 4000 Hz Recommended SensorsRepeatability ±1% Input filter 1- 255 samples Loop Specifications with a Model 499A OZ SensorRecommended Sensor Measurement Range 0-10 ppm mg/LOrdering Information Model 1055 Solu Comp II AnalyzerCombination Guide Part Number Description Weight Unpacking and Inspection Section InstallationInstallation General InformationPanel Mount Installation Panel MountingPipe Mount Installation Pipe MountingSurface Mount Installation Surface MountingPOWER, ALARM, OUTPUT, and Sensor Connections Section WiringPreparing Conduit Openings Model Solu Comp Section Wiring Model Solu Comp Section Wiring 41055105 41055106 41055107 41055108 41055109 41055110 40105536 40105559 Display Section Display and OperationKeypad Programming and Calibrating the Solu Comp II Tutorial Using Hold SecuritySection Programming the Analyzer Alarm Section Default SettingsOutput Dampening Or 4 mA Mode Section Sensors Output SectionDefault Settings Definitions Assigning Outputs 1Choose 4-20 mA or 0-20 mA Choose Output ConfigureChoose Output1 or Output2 Choose Output Range. Choose Output1 or Output2Alarm Relays Must be Configured Before Assigning Setpoints Choose Alarm Configure Choose Measurement or TempChoose Alarm Setpoints Definitions pH/ORP Definitions conductivity/resistivity Choose Measurement Choose Soln Temp Corr or Sensor IsoptntlDefinitions pH OutputsAlarms Measurement Choose Noise Rejection Choose ResetAnalyzer Procedure Choosing a Language Choose Default DisplayProcedure Changing Screen Contrast Section Calibration IntroductionCalibrating Temperature Procedure PH at 25C Standards Nominal pH Calibration Slope and OffsetChoose Measurement Choose BufferCal EnterManual Calibration pH S1ManualCal? Standardization pH Choose Measurement Choose StandardizeEntering a Known Slope Value pH Preparation of ORP standard solutions ORP CalibrationCalibrating AN IN-SERVICE Sensor Conductivity Procedure-Calibration against a standard meter and cellChoose Measurement Choose InProcess Procedure-Calibration against a standard solution ProgramDisplay Calibrate? Placing a NEW Sensor in Service Conductivity Choose Measurement Choose CellConstCalibrating the Analyzer Conductivity Cell constant Conductivity µS/cm Resistor k ΩTo Reset the Factory Resistance CALIBRATION, see Section Overview Section MaintenanceReplacement Parts Model Description See FigureExploded View of Solu Comp II Panel Mount Version Exploded View of Solu Comp II Pipe/Surface Mount Version Simulating Inputs Conductivity Simulating Temperature Section TroubleshootingOverview Troubleshooting Using Fault Codes Absolute Value of Measured Voltage Exceeds 2500 mVRTD Sense Line for Sensor 1 or Sensor 2 is Open PH Sensitive Glass Membrane is BrokenConductivity Sensor Open or Shorted Eeprom FailureProblem See Section Calibration Error During Two-Point CalibrationInvalid Input While Manually Entering Slope Calibration Error during StandardizationSensor Does Not Respond to Known pH Changes Model Solu Comp Section Troubleshooting Calibration Error Using Standard Resistors Conductivity, µS/cm Cell constant, /cm Alarm Relays Do Not WorkMeasurement seems wrong Current Output Too LowGeneral Simulating pH input when the preamplifier is in the sensorPreamplifier is in the Sensor Set the temperature correction to raw Section Simulating Inputs ConductivitySimulating temperature Three-Wire RTD ConfigurationMeasuring Reference Voltage Checking for a Poisoned Reference ElectrodeSection Return of Material Warranty RepairNON-WARRANTY Repair GeneralWarranty Specifications subject to change without notice

PN 51-1055pHC/rev.K specifications

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