Emerson PN 51-1055pHC/rev.K PH at 25C Standards Nominal pH, Calibration Slope and Offset

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MODEL SOLU COMP II

SECTION 6.0

 

CALIBRATION

6.3 AUTO CALIBRATION — pH

6.3.1 Purpose

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

2.Use auto calibration instead of manual calibration. Auto calibration avoids common pitfalls and reduces errors.

6.3.2 Definitions

1.AUTO CALIBRATION. The analyzer recognizes the buffers and uses temperature-corrected pH values in the calibration. The table lists the buffers the Solu Comp II recognizes.

 

pH at 25°C

Standard(s)

 

 

(nominal pH)

 

 

 

1.68

NIST, DIN 19266, JSI 8802, BSI (see note 1)

 

 

3.56

NIST, BSI

 

 

3.78

NIST

 

 

4.01

NIST, DIN 19266, JSI 8802, BSI

 

 

6.86

NIST, DIN 19266, JSI 8802, BSI

 

 

7.00

(see note 2)

 

 

7.41

NIST

 

 

9.18

NIST, DIN 19266, JSI 8802, BSI

 

 

10.01

NIST, JSI 8802, BSI

 

 

12.45

NIST, DIN 19266

 

Note 1: NIST is National Institute of Standards, DIN is Deutsche Institute für

Normung, JSI is Japan Standards Institute, and BSI is British Standards

Institute.

Note 2: pH 7 buffer is not a standard buffer. It is a popular commercial buffer in the United States.

The Solu Comp II also measures noise and drift and does not accept calibration data until readings are sta- ble. Calibration data will be accepted as soon as the pH reading is constant to within 0.02 units for 10 sec- onds. The stability settings cannot be changed.

2.SLOPE AND OFFSET. Once the Solu Comp II suc- cessfully completes the calibration, it calculates and displays the calibration slope and offset. The slope is reported as the slope at 25°C. Figure 6-1 defines the terms.

6.3.3 Procedure

1.Obtain two buffer solutions. Ideally the buffer pH val- ues should bracket the range of pH values to be meas- ured.

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

FIGURE 6-1. Calibration Slope and Offset

3. Calibrate the sensor by 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 Terminal Connections Rating 26-14 AWG wire size DimensionsHazardous Location Ordinary Location -68 onlyAnalyzer Conductivity Input Performance SpecificationsRecommended Sensors for Conductivity Range, µS/cm Cell constant, /cmMeasurement Range see table below Toroidal Conductivity Codes -21 and/orTemperature Correction none required Performance Specifications Analyzer ORP InputWhen used with conductivity -20-32 or Recommended Sensors for ORPRecommended Sensors Frequency Range 0.5 4000 HzRepeatability ±1% Recommended Sensor Loop Specifications with a Model 499A OZ SensorInput filter 1- 255 samples Measurement Range 0-10 ppm mg/LModel 1055 Solu Comp II Analyzer Ordering InformationCombination Guide Part Number Description Weight Installation Section InstallationUnpacking and Inspection General InformationPanel 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 Output Dampening Or 4 mA Mode Section Default SettingsAlarm Section Sensors Output SectionDefault Settings Assigning Outputs 1 DefinitionsChoose Output1 or Output2 Choose Output ConfigureChoose 4-20 mA or 0-20 mA Choose Output Range. Choose Output1 or Output2Alarm 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 Replacement Parts Section MaintenanceOverview Model Description See FigureExploded View of Solu Comp II Panel Mount Version Exploded View of Solu Comp II Pipe/Surface Mount Version Overview Troubleshooting Using Fault Codes Section TroubleshootingSimulating Inputs Conductivity Simulating Temperature Absolute Value of Measured Voltage Exceeds 2500 mVConductivity Sensor Open or Shorted PH Sensitive Glass Membrane is BrokenRTD Sense Line for Sensor 1 or Sensor 2 is Open Eeprom FailureCalibration 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 Measurement seems wrong Alarm Relays Do Not WorkConductivity, µS/cm Cell constant, /cm Current Output Too LowSimulating 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 VoltageNON-WARRANTY Repair Warranty RepairSection Return of Material GeneralWarranty Specifications subject to change without notice

PN 51-1055pHC/rev.K specifications

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