Emerson TCL Total Chlorine Sensor, General, Cleaning the membrane, Replacing the membrane

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MODEL TCL

SECTION 10

 

MAINTENANCE

10.2 TOTAL CHLORINE SENSOR

10.2.1 General

When used in clean water, the total chlorine sensor requires little maintenance. Generally, the sensor needs main- tenance when the response becomes sluggish or noisy or when readings drift follow calibration. Maintenance frequency is best determined by experience. If the sensor is used in potable water, expect to clean the mem- brane every month and replace the membrane and electrolyte solution every three months. Sensors used in dirty water require more frequent maintenance and calibration. However, if experience shows the sensor is holding calibration and not drifting appreciably between calibration intervals, the maintenance interval can be extended.

10.2.2 Cleaning the membrane.

Keep the membrane clean. Clean the membrane with water sprayed from a wash bottle. Use a soft tissue to gently wipe the membrane.

10.2.3 Replacing the membrane.

1.Hold the sensor with the membrane facing up.

2.Unscrew membrane retainer. Remove the membrane assembly and O-ring. See Figure 10-2.

3.Inspect the cathode. If it is tarnished, clean it by gently rubbing in the direction of the existing scratches (do not use a circular motion) with 400-600 grit silicon carbide finishing paper. Rinse the cathode thoroughly with water.

4.Prepare a new membrane. Hold the membrane assembly with the cup formed by the membrane and mem- brane holder pointing up. Fill the cup with electrolyte solution. Set aside.

5.Put a new O-ring in the groove.

6Place a drop of electrolyte solution on the cathode. Invert the membrane assembly and place it over the cathode stem.

7. Screw the membrane retainer back in place.

8.Hold the sensor with the membrane pointing down. Shake the sensor a few times, as though shaking down a clinical thermometer.

10.2.4 Replacing the membrane and electrolyte solution.

CAUTION

Fill solution may cause irritation.

Avoid contact with skin and eyes.

May be harmful if swallowed.

1.Unscrew the membrane retainer and remove the membrane assembly and O-ring. See Figure 10-2.

2.Hold the sensor over a container with the cathode pointing down.

3.Remove the fill plug and allow the electrolyte solution to drain out.

4.Wrap the plug with two turns of pipe tape and set aside. Remove old tape first.

5.Prepare a new membrane. Hold the membrane assembly with the cup formed by the membrane and mem- brane holder pointing up. Fill the cup with electrolyte solution. Set aside.

6.Hold the sensor at about a 45-degree angle with the cathode end pointing up. Add electrolyte solution (PN 9210438) through the fill hole until the liquid overflows. Tap the sensor near the threads to release trapped air bubbles. Add more electrolyte solution if necessary.

7.Place the fill plug in the electrolyte port and begin screwing it in. After several threads have engaged, rotate the sensor so that the cathode is pointing up and continue tightening the fill plug. Do not overtighten.

8.Place a new O-ring in the groove around the cathode post. Cover the holes at the base of the cathode stem with several drops of electrolyte solution.

9.Insert a small blunt probe, like a toothpick with the end cut off, through the pressure equalizing port. See Figure 10-2.

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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 TCL Sample Conditioning System Section Description and SpecificationsModel 1056 Chlorine Analyzer Model 499A CL-02 Sensor Sample Requirements GeneralSample Conditioning System 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 OperationInstallation InstallationUnpacking and Inspection Panel Mounting Dimensions Wall / Surface Mount Pipe MountInstall the Sample Conditioning Enclosure Install the SensorTCL Case Dimensions Provide Power to the Sample Conditioning System WiringPrepare Analyzer Conduit Openings 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 CodeOutputs First CONFIGURING, RANGING, and Simulating OutputsDefinitions ProgramOutput ConfigureAssign 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 Configure/Setpoint AlarmsAlarm 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 HartCalibration Calibrating TemperatureIntroduction 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 OverviewFault message Explanation Section Troubleshooting When a Fault Message is ShowingHardware Error 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 Anod Simulating InputsCath Simulating Temperature Simulating temperatureNON-WARRANTY Repair Warranty RepairSection Return of Material Warranty Return of MaterialSpecifications subject to change without notice

TCL specifications

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