Emerson PN 51-1055pHC/rev.K instruction manual Model Solu Comp Section Troubleshooting

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MODEL SOLU COMP II

SECTION 8.0

 

TROUBLESHOOTING

8.3.7 Calibration Was Successful, but Process pH Is Grossly Wrong and/or Noisy.

Grossly wrong or noisy readings suggest a ground loop (measurement system connected to earth ground at more than one point), a floating system (no earth ground), or noise being brought into the analyzer by the sensor cable. The problem arises from the process or installation. It is not a fault of the analyzer. The problem should disappear once the sensor is taken out of the system. Check the following:

A.Is a ground loop present?

1.Verify that the system works properly in buffers. Be sure there is no direct electrical connection between the buffer containers and the process liquid or piping.

2.Strip back the ends of a heavy gauge wire. Connect one end of the wire to the process piping or place it in the process liquid. Place the other end of the wire in the container of buffer with the sensor. The wire makes an electrical connection between the process and sensor.

3.If offsets and noise appear after making the connection, a ground loop exists.

B.Is the process grounded?

1.The measurement system needs one path to ground: through the process liquid and piping. Plastic pip- ing, fiberglass tanks, and ungrounded or poorly grounded vessels do not provide a path. A floating system can pick up stray voltages from other electrical equipment.

2.Ground the piping or tank to a local earth ground.

3.If noise still persists, simple grounding is not the problem. Noise is probably being carried into the instru- ment through the sensor wiring.

C.Simplify the sensor wiring.

1.Disconnect all sensor wires at the analyzer except pH/mV IN, REFERENCE IN, RTD IN and RTD RETURN. See the wiring diagrams in Section 3.2. If the sensor is wired to the analyzer through a remote junction box containing a preamplifier, disconnect the wires at the sensor side of the junction box.

2.Tape back the ends of the disconnected wires to keep them from making accidental connections with other wires or terminals.

3.Connect a jumper wire between the RTD RETURN and RTD SENSE terminals (see wiring diagrams in Section 3.2). Connect a second jumper wire between the REFERENCE IN and SOLUTION GROUND ter- minals.

4.If noise and/or offsets disappear, the interference was coming into the analyzer through one of the sensor wires. The system can be operated permanently with the simplified wiring.

D.Check for extra ground connections or induced noise.

1.If the sensor cable is run inside conduit, there may be a short between the cable and the conduit. Re-run the cable outside the conduit. If symptoms disappear, there is a short between the cable and the conduit. Likely a shield is exposed and touching the conduit. Repair the cable and reinstall it in the conduit.

2.To avoid induced noise in the sensor cable, run it as far away as possible from power cables, relays, and electric motors. Keep sensor wiring out of crowded panels and cable trays.

3.If ground loops persist, consult the factory. A visit from an experienced technician may be required to solve the problem.

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Contents Model Solu Comp Essential Instructions Quick Start Guide ORP Quick Reference Guide Model Solu Comp Table of Contents CONT’D List of TablesList of Figures IiiAbout This Document Section Description and Specifications Hazardous Location DimensionsTerminal Connections Rating 26-14 AWG wire size Ordinary Location -68 onlyRecommended Sensors for Conductivity Performance SpecificationsAnalyzer Conductivity Input Range, µS/cm Cell constant, /cmToroidal Conductivity Codes -21 and/or Measurement Range see table belowWhen used with conductivity -20-32 or Performance Specifications Analyzer ORP InputTemperature Correction none required Recommended Sensors for ORPRecommended Sensors Frequency Range 0.5 4000 HzRepeatability ±1% Input filter 1- 255 samples Loop Specifications with a Model 499A OZ SensorRecommended Sensor Measurement Range 0-10 ppm mg/LOrdering Information Model 1055 Solu Comp II AnalyzerCombination Guide Part Number Description Weight Unpacking and Inspection Section InstallationInstallation General InformationPanel Mount Installation Panel MountingPipe Mount Installation Pipe MountingSurface Mount Installation Surface MountingSection Wiring POWER, ALARM, OUTPUT, and Sensor ConnectionsPreparing Conduit Openings Model Solu Comp Section Wiring Model Solu Comp Section Wiring 41055105 41055106 41055107 41055108 41055109 41055110 40105536 40105559 Section Display and Operation DisplayKeypad Programming and Calibrating the Solu Comp II Tutorial Using Hold SecuritySection Programming the Analyzer Alarm Section Default SettingsOutput Dampening Or 4 mA Mode Section Sensors Output SectionDefault Settings Definitions Assigning Outputs 1Choose 4-20 mA or 0-20 mA Choose Output ConfigureChoose Output1 or Output2 Choose Output Range. Choose Output1 or Output2Alarm Relays Must be Configured Before Assigning Setpoints Choose Alarm Configure Choose Measurement or TempChoose Alarm Setpoints Definitions pH/ORP Definitions conductivity/resistivity Choose Measurement Choose Soln Temp Corr or Sensor IsoptntlDefinitions pH OutputsAlarms Measurement Choose Noise Rejection Choose ResetAnalyzer Choose Default Display Procedure Choosing a LanguageProcedure Changing Screen Contrast Section Calibration IntroductionCalibrating Temperature Procedure PH at 25C Standards Nominal pH Calibration Slope and OffsetChoose Measurement Choose BufferCal EnterManual Calibration pH S1ManualCal? Standardization pH Choose Measurement Choose StandardizeEntering a Known Slope Value pH Preparation of ORP standard solutions ORP CalibrationCalibrating AN IN-SERVICE Sensor Conductivity Procedure-Calibration against a standard meter and cellChoose Measurement Choose InProcess Procedure-Calibration against a standard solution ProgramDisplay Calibrate? Placing a NEW Sensor in Service Conductivity Choose Measurement Choose CellConstCalibrating the Analyzer Conductivity Cell constant Conductivity µS/cm Resistor k ΩTo Reset the Factory Resistance CALIBRATION, see Section Overview Section MaintenanceReplacement Parts Model Description See FigureExploded View of Solu Comp II Panel Mount Version Exploded View of Solu Comp II Pipe/Surface Mount Version Simulating Inputs Conductivity Simulating Temperature Section TroubleshootingOverview Troubleshooting Using Fault Codes Absolute Value of Measured Voltage Exceeds 2500 mVRTD Sense Line for Sensor 1 or Sensor 2 is Open PH Sensitive Glass Membrane is BrokenConductivity Sensor Open or Shorted Eeprom FailureProblem See Section Calibration Error During Two-Point CalibrationCalibration Error during Standardization Invalid Input While Manually Entering SlopeSensor Does Not Respond to Known pH Changes Model Solu Comp Section Troubleshooting Calibration Error Using Standard Resistors Conductivity, µS/cm Cell constant, /cm Alarm Relays Do Not WorkMeasurement seems wrong Current Output Too LowSimulating pH input when the preamplifier is in the sensor GeneralPreamplifier is in the Sensor Set the temperature correction to raw Section Simulating Inputs ConductivitySimulating temperature Three-Wire RTD ConfigurationMeasuring Reference Voltage Checking for a Poisoned Reference ElectrodeSection Return of Material Warranty RepairNON-WARRANTY Repair GeneralWarranty Specifications subject to change without notice

PN 51-1055pHC/rev.K specifications

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