Emerson TCL instruction manual Simulating Temperature, Simulating temperature

Page 75

MODEL TCL

11.6 SIMULATING TEMPERATURE

11.6.1 General.

The Model 1056 accepts a Pt100 RTD. The Pt100 RTD is in a three-wire configuration. See Figure 11-3.

11.6.2 Simulating temperature

To simulate the temperature input, wire a decade box to the analyzer or junction box as shown in Figure 11-4.

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 analyzer is measuring temperature correctly if the difference between measured temperatures equals the difference 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.

SECTION 11

TROUBLESHOOTING

FIGURE 11-3. 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 caused by temperature changes.

FIGURE 11-4. Simulating RTD Inputs.

 

Temp. (°C)

Pt 100 (Ω)

 

 

0

100.0

 

 

10

103.9

 

 

20

107.8

 

 

25

109.7

 

 

30

111.7

 

 

40

115.5

 

 

50

119.4

 

 

60

123.2

 

 

70

127.1

 

 

80

130.9

 

 

85

132.8

 

 

90

134.7

 

100

138.5

 

 

 

 

 

67

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Contents Total Chlorine Analyzer Electrical Shock Hazard Read this page Before ProceedingPage Rev. Level Date Hazardous Area InstallationModel TCL Total Chlorine Analyzer List of Tables Table of Contents ContdIii List of FiguresPage Section Description and Specifications Model TCL Sample Conditioning SystemModel 1056 Chlorine Analyzer Model 499A CL-02 Sensor General Sample RequirementsSample Conditioning System Linearity per ISO 15839 0-10 ppm 2% 0-20 ppm 3% Electrolyte Capacity Approximately 25 mLAccessories Sample Conditioning System Ordering Information and AccessoriesDescription Description Weight Ship WeightPrinciples of Operation Schematic of Sample Conditioning System and AnalyzerInstallation InstallationUnpacking and Inspection Panel Mounting Dimensions Pipe Mount Wall / Surface MountInstall the Sensor Install the Sample Conditioning EnclosureTCL Case Dimensions Wiring Provide Power to the Sample Conditioning SystemPrepare Analyzer Conduit Openings Analog output wiring PowerAlarm wiring Sensor WiringPpm mg/L Apply Power to the Analyzer and Complete Quick StartEnglish Total ChlorineTemp Units Menu Tree Start Sample Flow START-UPPrepare the Reagent Zero the SensorDisplay Display and OperationKeypad Range Programming the ANALYZER-TUTORIALCalibrate OutputsSecurity Output Range O1 S1 4mA 0.000 ppmO1 S1 20mA 08.50 ppm O2 S1 4mA 0.0C O2 S1 20mA 100.0CHold Using HoldFormat, Language, Warning, and Contrast Configuring the Main DisplayMain Format Language English ContrastProgramming the Analyzer Default SettingsMeasurement Chlorine Default Settings ChoicesSecurity Code Default SettingsChoices Default Temperature related settingsCONFIGURING, RANGING, and Simulating Outputs Outputs FirstDefinitions Configure ProgramOutputAssign O1 S1 20mA 10.00 ppm O2 S1 4mA O2 S1 20mA Configure Simulate Output ConfigureProcedure Ranging Outputs Output Output RangeOutput Configure SimulateConfiguring Alarms and Assigning Setpoints RangeSimulateDefinitions Alarms Configure/SetpointAlarm Don’t Simulate Alarms Configure/SetpointAlarm Simulate Alarm SimulateProcedure Synchronizing Timers Alarms Configure/Setpoint SimulateSynch Timers Yes Configuring the MeasurementSensor1Sensor MeasurementTemperature UnitsUnitsC S1 Temp Comp Auto Configuring Temperature Related SettingsProgram Outputs Alarms Measurement TemperatureSecurity Configuring Security SettingsProgram Alarms Measurement Temperature SecurityReset Analyzer Resetting the AnalyzerProgram Temperature Security Diagnostics Reset AnalyzerHart Digital CommunicationsCalibrating Temperature CalibrationIntroduction S1 Calibration Temperature S1 Calibration + 25.0CProcedure Calibrate SensorSensor11 OutputDetermination of Total Chlorine Calibrating Total ChlorineChoose Total Chlorine Procedure Zeroing the SensorSensor Temperature S1 Calibration ZeroZeroCalCal Process CalS1 Zero Cal Sensor zero failed Press Exit Calibrate?MA Output Cal Meter 000 mA Calibrating Analog OutputsCalibrate? Sensor OutputOutput Trim Complete Analyzer MaintenanceGeneral Cleaning the membraneReplacing the membrane and electrolyte solution Total Chlorine SensorSensor Parts Spare Parts Sample and reagent tubing ReagentReplacing Sample Tubing Peristaltic pump tubing Model TCL Replacing the air pump Replacing the air pump diaphragm and check valves Description Replacement Parts and Reagent for Sample Conditioning SystemOverview Section TroubleshootingUsing the Diagnostic Feature FaultsTroubleshooting When a Fault Message is Showing Fault message Explanation SectionHardware Error Sensor RTD Open Sensor CPU ErrorSensor ADC Error Sensor IncompatibleSensor Negative Reading Troubleshooting When a Warning Message is ShowingExplanation Section Sensor Need Factory CalZero current is unstable Troubleshooting When no Error Message is ShowingProblem See Section Zero current is too highSensitivity is low or readings are low Readings drift Simulating Inputs AnodCath Simulating temperature Simulating TemperatureWarranty Repair NON-WARRANTY RepairSection Return of Material Return of Material WarrantySpecifications subject to change without notice

TCL specifications

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