Emerson TCL instruction manual Simulating Inputs, Anod, Cath

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MODEL TCL

SECTION 11

 

TROUBLESHOOTING

11.5.6 Readings are too high

1.Is the sample conditioning reagent clear and colorless? If the reagent is pale yellow, results will be high. The pale yellow color is caused by iodine, which comes from the reaction between atmospheric oxygen and potas- sium iodide. The reaction is catalyzed by sunlight. The purpose of the blue carboy is to protect the reagent from sunlight.

2.Is the sensor fill solution fresh? An old, discolored fill solution may produce a high reading.

11.5.7 Temperature measured by standard thermometer was more than 3°C different from analyzer.

1.Is the standard thermometer, RTD, or thermistor accurate? General purpose liquid-in-glass thermometers, par- ticularly ones that have been mistreated, can have surprisingly large errors.

2.Is the temperature element in the sensor completely submerged in the liquid?

3.Is the standard temperature sensor submerged to the correct level?

11.5.8 Current Output Too Low.

Load resistance is too high. Maximum load is 550 Ω.

11.5.9 Alarm Relays Do Not Work

1.Verify the relays are properly wired.

2.Verify that deadband is correctly set. See Section 7.4.

11.6 SIMULATING INPUTS

To check the performance of the analyzer, use a decade box and 1.5V battery to simulate the current from the sensor. The battery, which opposes the polarizing voltage, is necessary to ensure that the sensor current has the correct sign.

1.Disconnect the anode and cathode leads from terminals 8 and 10 on TB1 and connect a decade box and 1.5V battery as shown in Figure 11-2. It is not necessary to disconnect the RTD leads.

2.Set the decade box to 1.4 MΩ.

3.Note the sensor current. It should be about 960 nA. The actual value depends on the voltage of the battery. To view the sensor current, go to the main display and press DIAG. Choose sensor 1. The input current is the second line in the display. Change the decade box resistance and verify that the correct current is shown. Calculate current from the equation:

current (nA) = Vbattery — 250 (voltages in mV) resistance (MΩ)

The voltage of a fresh 1.5 volt battery is about 1.6 volt (1600 mV).

 

7

ANOD SHLD

 

8

ANOD

R

9

CATH SHLD

 

10

CATH

FIGURE 11-2. Simulating Chlorine

66

Image 74
Contents Total Chlorine Analyzer Read this page Before Proceeding Electrical Shock HazardPage Hazardous Area Installation Rev. Level DateModel TCL Total Chlorine Analyzer Table of Contents Contd List of TablesList of Figures IiiPage Model 1056 Chlorine Analyzer Section Description and SpecificationsModel TCL Sample Conditioning System Model 499A CL-02 Sensor Sample Conditioning System GeneralSample Requirements Electrolyte Capacity Approximately 25 mL Linearity per ISO 15839 0-10 ppm 2% 0-20 ppm 3%Ordering Information and Accessories Accessories Sample Conditioning SystemDescription Weight Ship Weight DescriptionSchematic of Sample Conditioning System and Analyzer Principles of OperationUnpacking and Inspection InstallationInstallation Panel Mounting Dimensions Wall / Surface Mount Pipe MountInstall the Sample Conditioning Enclosure Install the SensorTCL Case Dimensions Prepare Analyzer Conduit Openings WiringProvide Power to the Sample Conditioning System Power Analog output wiringSensor Wiring Alarm wiringTotal Chlorine Apply Power to the Analyzer and Complete Quick StartEnglish Ppm mg/LTemp Units Menu Tree Zero the Sensor START-UPPrepare the Reagent Start Sample FlowDisplay and Operation DisplayKeypad Outputs Programming the ANALYZER-TUTORIALCalibrate RangeO2 S1 4mA 0.0C O2 S1 20mA 100.0C Output Range O1 S1 4mA 0.000 ppmO1 S1 20mA 08.50 ppm SecurityUsing Hold HoldLanguage English Contrast Configuring the Main DisplayMain Format Format, Language, Warning, and ContrastDefault Settings Programming the AnalyzerDefault Settings Choices Measurement ChlorineTemperature related settings Default SettingsChoices Default Security CodeDefinitions CONFIGURING, RANGING, and Simulating OutputsOutputs First Assign ConfigureProgramOutput Output Output Range Configure Simulate Output ConfigureProcedure Ranging Outputs O1 S1 20mA 10.00 ppm O2 S1 4mA O2 S1 20mARangeSimulate Configure SimulateConfiguring Alarms and Assigning Setpoints OutputDefinitions Alarm AlarmsConfigure/Setpoint Simulate Alarms Configure/SetpointAlarm Simulate Alarm Don’t SimulateConfiguring the Measurement Alarms Configure/Setpoint SimulateSynch Timers Yes Procedure Synchronizing TimersMeasurement Sensor1SensorTemperature Configuring Temperature Related SettingsProgram Outputs Alarms Measurement Temperature UnitsUnitsC S1 Temp Comp AutoSecurity Configuring Security SettingsProgram Alarms Measurement Temperature SecurityReset Analyzer Resetting the AnalyzerProgram Temperature Security Diagnostics Reset AnalyzerDigital Communications HartIntroduction Calibrating TemperatureCalibration Calibrate SensorSensor11 Output Temperature S1 Calibration + 25.0CProcedure S1 CalibrationCalibrating Total Chlorine Determination of Total ChlorineProcedure Zeroing the Sensor Choose Total ChlorineCalibrate? Temperature S1 Calibration ZeroZeroCalCal Process CalS1 Zero Cal Sensor zero failed Press Exit SensorOutput Calibrating Analog OutputsCalibrate? Sensor MA Output Cal Meter 000 mAOutput Trim Complete Maintenance AnalyzerTotal Chlorine Sensor Cleaning the membraneReplacing the membrane and electrolyte solution GeneralSensor Parts Spare Parts Reagent Sample and reagent tubingReplacing Sample Tubing Peristaltic pump tubing Model TCL Replacing the air pump Replacing the air pump diaphragm and check valves Replacement Parts and Reagent for Sample Conditioning System DescriptionFaults Section TroubleshootingUsing the Diagnostic Feature OverviewHardware Error Troubleshooting When a Fault Message is ShowingFault message Explanation Section Sensor Incompatible Sensor CPU ErrorSensor ADC Error Sensor RTD OpenSensor Need Factory Cal Troubleshooting When a Warning Message is ShowingExplanation Section Sensor Negative ReadingZero current is too high Troubleshooting When no Error Message is ShowingProblem See Section Zero current is unstableSensitivity is low or readings are low Readings drift Cath Simulating InputsAnod Simulating Temperature Simulating temperatureSection Return of Material Warranty RepairNON-WARRANTY Repair Warranty Return of MaterialSpecifications subject to change without notice

TCL specifications

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