Emerson PN 51-1055pHC/rev.K Simulating temperature, Three-Wire RTD Configuration

Page 83

MODEL SOLU COMP II

SECTION 8.0

 

TROUBLESHOOTING

8.8 SIMULATING TEMPERATURE

8.8.1 General.

The Solu Comp II accepts either a Pt100 or a Pt1000 RTD in a three-wire configuration. See Figure 8-5.

8.8.2 Simulating temperature

To simulate the temperature input, wire a decade box to the analyzer or junction box as shown in Figure 8-6.

To check the accuracy of the temperature measure- ment, set the resistor simulating the RTD to the values indicated in the table and note the temperature read- ings. The measured temperature might not agree with the value in the table. During sensor calibration an offset might have been applied to make the measured tem- perature agree with a standard thermometer. The offset is also applied to the simulated resistance. The Solu Comp II is measuring temperature correctly if the differ- ence between measured temperatures equals the differ- ence between the values in the table to within ±0.1°C.

For example, start with a simulated resistance of 103.9 Ω, which corresponds to 10.0°C. Assume the offset from the sensor calibration was -0.3 Ω. Because of the offset, the analyzer calculates temperature using 103.6 Ω. The result is 9.2°C. Now change the resistance to 107.8 Ω, which corresponds to 20.0°C. The analyzer uses 107.5 Ω to calculate the temperature, so the display reads 19.2°C. Because the difference between the displayed temperatures (10.0°C) is the same as the difference between the simulated temperatures, the analyzer is working correctly.

FIGURE 8-5. Three-Wire RTD Configuration.

Although only two wires are required to connect the RTD to the analyzer, using a third (and some- times fourth) wire allows the analyzer to correct for the resistance of the lead wires and for changes in the lead wire resistance with temperature.

FIGURE 8-6. Simulating RTD Inputs.

 

Temp. (°C)

Pt 100 (Ω)

Pt 1000 (Ω)

 

 

0

100.0

1000

 

 

10

103.9

1039

 

 

20

107.8

1078

 

 

25

109.7

1097

 

 

30

111.7

1117

 

 

40

115.5

1155

 

 

50

119.4

1194

 

 

60

123.2

1232

 

 

70

127.1

1271

 

 

80

130.9

1309

 

 

85

132.8

1328

 

 

90

134.7

1347

 

 

100

138.5

1385

 

 

 

 

 

 

74

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