Emerson PN 51-1055pHC/rev.K Problem See Section, Calibration Error Using Standard Resistors

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MODEL SOLU COMP II

SECTION 8.0

 

TROUBLESHOOTING

8.4 TROUBLESHOOTING WHEN NO ERROR MESSAGE IS SHOWING — CONDUCTIVITY

 

Problem

See Section

 

 

 

 

 

 

Calibration Error using standard resistors

8.4.1

 

 

 

 

 

 

New temperature during calibration more than 2-3°C different from the live reading

8.4.2

 

 

 

 

 

 

Possible Error Warning during calibration against standard solutions

8.4.3

 

 

 

 

 

 

Possible Error Warning during calibration against standard meter and cell

8.4.4

 

 

 

 

 

 

Measurement seems wrong: too high, too low, or doesn’t match referee instrument

8.4.5

 

 

 

 

 

8.4.1 Calibration Error Using Standard Resistors

A.Check the accuracy of the standard resistor or decade box.

B.Contact resistance and lead resistance can be a major source of error, particularly when a low value resistor is being used. To minimize errors, be sure all connections are tight and use the shortest leads possible.

8.4.2 Difference Between Solu Comp II and Standard Thermometer is Greater Than 3°C.

A.Is the reference thermometer, RTD, or thermistor accurate? General purpose thermometers, particularly ones that have been mistreated, can have surprisingly large errors.

B.Review Section 6.2.

8.4.3 Possible Error Warning During Calibration Against a Standard Solution.

A.Review Section 6.8.1 and 6.8.3.

B.Is the conductivity of the standard solution appropriate for the cell constant of the sensor? Refer to the table in Section 8.4.5. Choose a conductivity standard approximately in the center of the range.

C.Is a 0.01/cm sensor being calibrated? Generally, it is best not to calibrate 0.01/cm cells against standard solu- tions. Standards having low conductivity are readily contaminated by atmospheric carbon dioxide. Contamination increases the apparent conductivity of the standard, leading to cell constants that are too low. Standards having high conductivity can also be a problem. When high conductivity solutions are measured with low constant sensors, the solution resistance is low. The resistance of the oxide film on the electrodes may then be contributing an appreciable amount to the measured resistance. Thus, the apparent conductivity

is too low, and the cell constant is too high. It is best to calibrate 0.01/cm cells against a 0.01/cm standard cell using a solution with conductivity between 5 and 10 µS/cm.

D.Has the correct conductivity been entered? If calibration was done with temperature correction turned off, be sure to enter the conductivity of the standard at the measurement temperature. If temperature correction was left on, use the conductivity at 25°C. Verify that the temperature correction algorithm being used is appropri- ate for the standard.

E.Were readings, including temperature, stable before calibration?

8.4.4 Possible Error Warning During Calibration Against a Standard Meter and Cell.

A.Review Section 6.8.1 and 6.8.2.

B.Is the calibration of the standard instrument correct and is the cell constant of the standard the same decade as the sensor being calibrated?

C.Is the temperature correction in the Solu Comp II and the reference instrument either both turned off (recom- mended) or both turned on? If the temperature correction is on, are both instruments using the same temper- ature correction?

D.Is there good circulation of test solution around the sensors?

E.Were readings, including temperature, stable before calibration?

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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 orFrequency Range 0.5 4000 Hz Recommended SensorsRepeatability ±1% 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 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 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 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 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 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 Current Output Too Low Alarm Relays Do Not WorkMeasurement seems wrong Conductivity, µS/cm Cell constant, /cmGeneral 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 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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