Emerson PN 51-1055pHC/rev.K Standardization pH, Choose Measurement Choose Standardize

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MODEL SOLU COMP II

SECTION 6.0

 

CALIBRATION

6.5 STANDARDIZATION — pH

6.5.1 Purpose

1.The pH measured by the Solu Comp II analyzer can be changed to match the reading from a second or ref- eree instrument. The process of making the two readings agree is called standardization.

2.During standardization, the difference between the two pH values is converted to the equivalent voltage. The voltage, called the reference offset, is added to all subsequent measured cell voltages before they are con- verted to pH. If a standardized sensor is placed in a buffer solution, the measured pH will differ from the buffer pH by an amount equivalent to the standardization offset.

6.5.2 Procedure

1.Install the sensor in the process liquid.

2.Once readings are stable, measure the pH of the liquid using a referee instrument.

3.Because the pH of the process liquid may change if the temperature changes, measure the pH of the grab sample immediately after taking it.

4.For poorly buffered samples, it is best to determine the pH of a continuously flowing sample from a point as close as possible to the sensor.

5.Standardize the Solu Comp II analyzer by following the steps below.

CalibrateHold

ProgramDisplay

Calibrate?

Sensor1Sensor2

CalSensor1?

Measurement Temp

S1

Standardize

Slope

BufferCal

 

 

 

 

Live

7.00pH

CalS1

07.00pH

 

 

 

 

Invalid

Input!

Max:

14.00pH

 

 

 

 

S1

Standardize

Slope

BufferCal

 

 

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

b.Choose Sensor1 (pH sensor).

c.Choose Measurement.

d.Choose Standardize.

e.The top line shows the present pH reading. Change the pH reading in the second line to match the referee instrument. Press ENTER.

f.The screen at left appears if the entered pH was greater than 14.00. The display then returns to step e. Repeat the standardization.

g.If the entry was accepted, the screen at left appears. To verify that the new pH was accepted, return to the main display by pressing MENU fol- lowed 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 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 ORPFrequency Range 0.5 4000 Hz Recommended SensorsRepeatability ±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 InstallationPOWER, 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 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 Procedure Choosing a Language Choose Default DisplayProcedure 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 SectionInvalid 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 Measurement seems wrong Alarm Relays Do Not WorkConductivity, µS/cm Cell constant, /cm Current Output Too LowGeneral Simulating pH input when the preamplifier is in the sensorPreamplifier 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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