Emerson TCL Troubleshooting When no Error Message is Showing, Problem See Section

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MODEL TCL

SECTION 11

 

TROUBLESHOOTING

11.5 TROUBLESHOOTING WHEN NO ERROR MESSAGE IS SHOWING

 

Problem

See Section

 

Zero current was accepted, but the current is outside the range -10 to 50 nA

11.5.1

 

 

Error or warning message appears while zeroing the sensor (zero current is too high)

11.5.1

 

 

Zero current is unstable

11.5.2

 

 

Sensor can be calibrated, but current is low

11.5.3

 

 

Process readings are erratic or wander

11.5.4

 

 

Readings drift

11.5.5

 

 

Readings are too high

11.5.6

 

 

Readings are too low

11.5.3

 

 

Calibration temperature more than 3°C different from standard thermometer

11.5.7

 

 

Current output is too low

11.5.8

 

 

Alarm relays do not operate when setpoint is exceeded or do not release when reading is

11.5.9

 

 

below setpoint

 

 

 

 

 

 

 

 

15.5.1 Zero current is too high

1.Is the sensor properly wired to the analyzer? See Section 4.3.

2.Is the zero solution chlorine free? Take a sample of the zero solution and test it for total chlorine. The con- centration should be less than 0.05 ppm. Avoid using tap water for zeroing the sensor. Even though the tap water contains no iodine, chlorine oxidants present in the tap water may produce a sensor current as high as 100 nA.

3.Has adequate time been allowed for the sensor to reach a minimum stable zero current? It may take several hours, sometimes as long as overnight, for a new sensor to stabilize.

4.Is the sensor fill solution fresh? An old, discolored fill solution may produce a high zero current.

5.Is the membrane damaged? Inspect the membrane and replace it if necessary.

11.5.2 Zero current is unstable

1.Is the sensor properly wired to the analyzer? See Section 4.3. Verify that all connections are tight.

2.Readings can be erratic when a new sensor is first placed in service. Readings usually stabilize over about an hour.

3.Is the space between the membrane and cathode filled with electrolyte solution and is the flow path between the electrolyte reservoir and membrane clear? Often the flow of electrolyte can be started by simply holding the sensor with the membrane end pointing down and sharply shaking the sensor a few times as though shak- ing down a clinical thermometer.

If shaking does not work, try clearing the holes around the cathode stem. Hold the sensor with the membrane end pointing up. Unscrew the membrane retainer and remove the membrane assembly. Use the end of a straightened paper clip to clear the holes at the base of the cathode stem.

Verify the sensor is filled with electrolyte solution. Refer to Section 10.2.

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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 Model 1056 Chlorine Analyzer Section Description and SpecificationsModel TCL Sample Conditioning System Model 499A CL-02 Sensor Sample Conditioning System GeneralSample Requirements 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 AnalyzerUnpacking and Inspection InstallationInstallation Panel Mounting Dimensions Pipe Mount Wall / Surface MountInstall the Sensor Install the Sample Conditioning EnclosureTCL Case Dimensions Prepare Analyzer Conduit Openings WiringProvide Power to the Sample Conditioning System 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 settingsDefinitions CONFIGURING, RANGING, and Simulating OutputsOutputs First Assign ConfigureProgramOutput 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 Alarm AlarmsConfigure/Setpoint 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 CommunicationsIntroduction Calibrating TemperatureCalibration 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 FaultsHardware Error Troubleshooting When a Fault Message is ShowingFault message Explanation Section 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 Cath Simulating InputsAnod Simulating temperature Simulating TemperatureSection Return of Material Warranty RepairNON-WARRANTY Repair Return of Material WarrantySpecifications subject to change without notice

TCL specifications

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