Emerson PN 51-1055pHC/rev.K instruction manual Calibration Error during Standardization

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MODEL SOLU COMP II

SECTION 8.0

 

 

 

TROUBLESHOOTING

 

 

 

 

 

 

REFERENCE IMPEDANCE (Ref Imp)

 

 

 

 

 

 

 

 

less than 40 kΩ

 

Normal reading, reference junction is clean.

 

(20 kΩ for TUpH sensors)

 

 

 

 

 

 

 

 

 

between 40 and 140 kΩ

 

Reference junction is fouled or dirty.

 

(20 - 140 kΩ for TUpH sensors)

 

 

 

 

 

 

 

 

 

greater than 140 kΩ

 

Reference junction is blocked or electrolyte is depleted. Sensor has failed.

 

 

 

 

 

 

GLASS IMPEDANCE (Glass Imp)

 

 

 

 

 

 

 

 

less than 10 MΩ

 

Glass bulb is cracked or broken. Sensor has failed.

 

 

 

 

 

 

between 10 and 1000 MΩ

 

Normal reading.

 

 

 

 

 

 

greater than 1000 MΩ

 

pH sensor may be nearing the end of its service life.

 

 

 

 

 

8.3.3 Calibration Error during Standardization.

During standardization, the millivolt signal from the pH cell is increased or decreased until it agrees with the pH reading from a referee instrument. A unit change in pH requires an offset of about 59 mV. The Solu Comp II limits the offset to ±1400 mV. If the standardization causes an offset greater than ±1400 mV, the analyzer will display the Calibration Error screen. The standardization will not be updated. Check the following:

A.Is the referee pH meter working and properly calibrated? Check the response of the referee sensor in buffers.

B.Is the process sensor working properly? Check the process sensor in buffers.

C.Is the sensor fully immersed in the process liquid? If the sensor is not completely submerged, it may be meas- uring the pH of the liquid film covering the glass bulb and reference element. The pH of this film may be dif- ferent from the pH of the bulk liquid.

D.Is the sensor fouled? The sensor measures the pH of the liquid adjacent to the glass bulb. If the sensor is heavily fouled, the pH of liquid trapped against the bulb may be different from the bulk liquid.

E.Has the sensor been exposed to poisoning agents (sulfides or cyanides) or has it been exposed to extreme temperature? Poisoning agents and high temperature can shift the reference voltage many hundred millivolts. To check the reference voltage, see Section 8.9.

8.3.4 Invalid Input While Manually Entering Slope.

If the sensor slope is known from other sources, it can be entered directly into the analyzer. The Solu Comp II will not accept a slope (at 25°C) outside the range 45 to 60 mV/pH. See section 8.3.2 for troubleshooting sensor slope problems.

8.3.5 Sensor Does Not Respond to Known pH Changes.

A.Did the expected pH change really occur? If the process pH reading was not what was expected, check the performance of the sensor in buffers. Also, use a second pH meter to verify the change.

B.Is the sensor properly wired to the analyzer?

C.Is the glass bulb cracked or broken? Check the glass electrode impedance. See Section 8.3.2, step f.

D.Is the analyzer working properly. Check the analyzer by simulating the pH input.

8.3.6 Buffer Calibration Is Acceptable, Process pH Is Slightly Different from Expected Value.

Differences between pH readings made with an on-line instrument and a laboratory or portable instrument are nor- mal. The on-line instrument is subject to process variables, for example ground potentials, stray voltages, and ori- entation effects that may not affect the laboratory or portable instrument. To make the process reading agree with a referee instrument, see Section 6.5.

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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 ORPRepeatability ±1% Recommended SensorsFrequency Range 0.5 4000 Hz 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 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 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 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 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 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 Measurement seems wrong Alarm Relays Do Not WorkConductivity, µS/cm Cell constant, /cm Current Output Too LowPreamplifier 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 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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