Emerson PN 51-1055pHC/rev.K instruction manual Manual Calibration pH

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MODEL SOLU COMP II

SECTION 6.0

 

CALIBRATION

6.4 MANUAL CALIBRATION — pH

6.4.1 Purpose

1.New sensors must be calibrated before use. Regular recalibration is also necessary.

2.Use manual calibration if non-standard buffers are being used; otherwise, use auto calibration. Auto calibra- tion avoids common pitfalls and reduces errors.

6.4.2 Definitions

1.MANUAL CALIBRATION. In auto calibration the analyzer recognizes the buffer and uses the temperature-cor- rected pH value in the calibration. The analyzer also measures noise and drift and does not accept calibration data until readings are stable. During manual calibration, the user must judge when readings are stable and look up and enter the buffer values.

2.SLOPE AND OFFSET. Once the Solu Comp II successfully completes the calibration, it calculates and dis- plays the calibration slope and offset. The slope is reported as the slope at 25ºC. Figure 6-1 defines the terms.

6.4.3 Procedure

1.Obtain two buffer solutions. Ideally, the buffer pHs should bracket the range of pH values to be measured. Also obtain a thermometer. The pH of most buffer solutions is a function of temperature. To calibrate the sensor properly, the pH of the buffer at the measurement temperature must be entered in the analyzer.

2.Remove the sensor from the process liquid. If the process and buffer temperature are appreciably different, place the sensor in a container of tap water at the buffer temperature. Do not start the calibration until the sen- sor has reached the buffer temperature. Thirty minutes is usually adequate.

3.Calibrate the sensor using the procedure on the following page.

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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 orRepeatability ±1% Recommended SensorsFrequency Range 0.5 4000 Hz 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 InstallationPreparing Conduit Openings Section WiringPOWER, ALARM, OUTPUT, and Sensor Connections Model Solu Comp Section Wiring Model Solu Comp Section Wiring 41055105 41055106 41055107 41055108 41055109 41055110 40105536 40105559 Keypad Section Display and OperationDisplay 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 Procedure Changing Screen Contrast Choose Default DisplayProcedure Choosing a Language 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 SectionSensor Does Not Respond to Known pH Changes Calibration Error during StandardizationInvalid Input While Manually Entering Slope 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, /cmPreamplifier is in the Sensor Simulating pH input when the preamplifier is in the sensorGeneral 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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