Emerson PN 51-1055pHC/rev.K instruction manual Simulating Inputs Conductivity

Page 82

MODEL SOLU COMP II

SECTION 8.0

 

TROUBLESHOOTING

8.7 SIMULATING INPUTS — CONDUCTIVITY

To check the performance of the analyzer, use standard resistors to simulate conductivity.

A.Set the temperature correction to raw (Section 5.5).

B.Connect the standard resistors to TB-5 as shown in Figure 8-4.

C.Determine how closely the displayed resistivity or conductivity agrees with the known resistance.

To convert resistance to conductivity, use the equation:

Conductivity (µS/cm) =

Cell constant (/cm)

x 106

 

Resistance (Ω)

 

or

 

 

Conductivity (mS/cm) =

Cell constant (/cm)

x 103

 

Resistance (Ω)

 

FIGURE 8-4. Simulating Conductivity

Thus, if the cell constant is 0.103/cm and the standard resistance is 500 Ω, the displayed conductivity should be (0.103/cm)(106)/(500Ω) or 206 µS/cm.

To convert resistance to resistivity, use the equation:

Resistivity (MΩ-cm) = Resistance (MΩ)

Cell constant (/cm)

Thus, if the cell constant is 0.01020/cm and the standard resistance is 100 kΩ (0.100 MΩ), the displayed resis- tivity should be (0.100 MΩ)/(0.01020/cm) or 9.80 MΩ-cm.

Consult the table for the accuracy specification:

 

Range

Cell constant (/cm)

Accuracy*

 

 

0.055 - 10 µS/cm

0.01

±0.9% of reading

 

 

 

 

or ±0.002 µS/cm

 

 

0.055 - 50 µS/cm

0.01

±2% of reading

 

 

0.055 - 500 µS/cm

0.1

±2% of reading

 

 

 

 

or ±0.1 µS/cm

 

0.055 - 5000 µS/cm

1.0

±2% of reading

 

 

 

 

or ±1 µS/cm

 

 

0 - 5 mS/cm

1.0

±2% of reading

 

 

 

 

or ±0.001 mS/cm

 

 

0 - 20 mS/cm

10

±2% of reading

 

 

 

 

or ±0.01 mS/cm

 

 

10 - 20 MΩ-cm

0.01

0.9% of reading

 

 

 

 

 

 

*whichever is greater

D. If the analyzer does not meet the accuracy specifications, it can be recalibrated. See Section 6.10.

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Contents Model Solu Comp Essential Instructions Quick Start Guide ORP Quick Reference Guide Model Solu Comp Table of Contents CONT’D List of TablesList of Figures IiiAbout This Document Section Description and Specifications Hazardous Location DimensionsTerminal Connections Rating 26-14 AWG wire size Ordinary Location -68 onlyRecommended Sensors for Conductivity Performance SpecificationsAnalyzer Conductivity Input Range, µS/cm Cell constant, /cmToroidal Conductivity Codes -21 and/or Measurement Range see table belowWhen used with conductivity -20-32 or Performance Specifications Analyzer ORP InputTemperature Correction none required Recommended Sensors for ORPFrequency Range 0.5 4000 Hz Recommended SensorsRepeatability ±1% Input filter 1- 255 samples Loop Specifications with a Model 499A OZ SensorRecommended Sensor Measurement Range 0-10 ppm mg/LOrdering Information Model 1055 Solu Comp II AnalyzerCombination Guide Part Number Description Weight Unpacking and Inspection Section InstallationInstallation General InformationPanel Mount Installation Panel MountingPipe Mount Installation Pipe MountingSurface Mount Installation Surface MountingPOWER, 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 Using Hold SecuritySection Programming the Analyzer Alarm Section Default SettingsOutput Dampening Or 4 mA Mode Section Sensors Output SectionDefault Settings Definitions Assigning Outputs 1Choose 4-20 mA or 0-20 mA Choose Output ConfigureChoose Output1 or Output2 Choose Output Range. Choose Output1 or Output2Alarm Relays Must be Configured Before Assigning Setpoints Choose Alarm Configure Choose Measurement or TempChoose Alarm Setpoints Definitions pH/ORP Definitions conductivity/resistivity Choose Measurement Choose Soln Temp Corr or Sensor IsoptntlDefinitions pH OutputsAlarms Measurement Choose Noise Rejection Choose ResetAnalyzer Procedure Choosing a Language Choose Default DisplayProcedure Changing Screen Contrast Section Calibration IntroductionCalibrating Temperature Procedure PH at 25C Standards Nominal pH Calibration Slope and OffsetChoose Measurement Choose BufferCal EnterManual Calibration pH S1ManualCal? Standardization pH Choose Measurement Choose StandardizeEntering a Known Slope Value pH Preparation of ORP standard solutions ORP CalibrationCalibrating AN IN-SERVICE Sensor Conductivity Procedure-Calibration against a standard meter and cellChoose Measurement Choose InProcess Procedure-Calibration against a standard solution ProgramDisplay Calibrate? Placing a NEW Sensor in Service Conductivity Choose Measurement Choose CellConstCalibrating the Analyzer Conductivity Cell constant Conductivity µS/cm Resistor k ΩTo Reset the Factory Resistance CALIBRATION, see Section Overview Section MaintenanceReplacement Parts Model Description See FigureExploded View of Solu Comp II Panel Mount Version Exploded View of Solu Comp II Pipe/Surface Mount Version Simulating Inputs Conductivity Simulating Temperature Section TroubleshootingOverview Troubleshooting Using Fault Codes Absolute Value of Measured Voltage Exceeds 2500 mVRTD Sense Line for Sensor 1 or Sensor 2 is Open PH Sensitive Glass Membrane is BrokenConductivity Sensor Open or Shorted Eeprom FailureProblem See Section Calibration Error During Two-Point CalibrationInvalid 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 Conductivity, µS/cm Cell constant, /cm Alarm Relays Do Not WorkMeasurement seems wrong Current Output Too LowGeneral Simulating pH input when the preamplifier is in the sensorPreamplifier is in the Sensor Set the temperature correction to raw Section Simulating Inputs ConductivitySimulating temperature Three-Wire RTD ConfigurationMeasuring Reference Voltage Checking for a Poisoned Reference ElectrodeSection Return of Material Warranty RepairNON-WARRANTY Repair GeneralWarranty Specifications subject to change without notice

PN 51-1055pHC/rev.K specifications

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