Emerson Process Management 3081 pH/ORP instruction

MODEL 3081 pH/ORP	SECTION 12.0
	TROUBLESHOOTING

12. 5.13 Transmitter Locks Up

A.Turn the dc power off, then turn it back on.

B.If the problem persists, replace the electronic board stack (PN 23574-02).

12. 5.14 Transmitter Periodically Restarts Itself

A.The problem is usually related to improperly wired RTD input terminals.

1.The RTD return wire must be connected to TB-3. The RTD sense wire must be connected to TB-4, and the RTD in wire must be connected to TB-5. See the wiring diagrams in Section 3.0. If the pH sensor does not have an RTD, connect a jumper wire across the terminals TB-3 and TB-4 and a second jumper across TB-4 and TB-5.

2.If the RTD connections have been jumpered as described in step B, automatic temperature compensation must be turned off and the transmitter operated in manual temperature mode. See Section 8.5 for the procedure.

B.If RTD wiring is correct and problems still persist.

1.Monitor the dc power supply. Be sure the power is not intermittent and the correct voltage is present. See Section 2.5.

2.Try connecting the transmitter to a different power supply.

12.6 SYSTEMATIC TROUBLESHOOTING

This section contains troubleshooting flow charts for use with either external preamplifiers, or the transmitters internal pre- amplifier.

a.If an accessible preamplifier is in the sensor or remote junction box, use Figure 12-5.

b.If the preamplifier is in the transmitter or if the sensor has a built in (potted) preamplifier, use Figure 12-6.

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Image 121

Emerson Process Management 3081 pH/ORP 12 .13 Transmitter Locks Up, 12 .14 Transmitter Periodically Restarts Itself

Contents

Model 3081 pH/ORP Essential Instructions What YOU Need to Know Base Model Use the Quick Start Guide ifRTD Preamplifier located Model Option note Quick Start Guide for Model 3081pH/ORP Power up and Calibration WiringOutput Optional Standardizing to Match a Reference Instrument Automatic Buffer Calibration Menu Tree for pH Technical Support Hotline Calibrate Program Diagnose Model 3081 PH/ORP Microprocessor Transmitter Table of Contents Table of Contents CONT’D 114 13.014.0 120 Table of Contents CONT’D List of Figures Table of Contents CONT’D List of Figures CONT’D Table of Contents CONT’D List of Tables Features Description and SpecificationsSection Year 2000 Compliance Millennium Status AccessoriesModel 275 Hart COMMUNICATOR. The Model Intrinsic Safety Specifications -GENERAL for Model 3081 pH/ORPConduit Openings 3/4 in. Fnpt Hazardous Area Classification Explosion Proof Ordering Information Specifications ORPPH Input Range 0 to 14 pH Preamplifier Location Model 3081 pH/ORP TRANSMITTER-SENSOR Compatibility ChartSensor-mounted Remote Model ORP MODEL/PN Description Shipping Weight PRE-INSTALLATION Setup 2.2.1 Transmitter Default Settings Section InstallationTemperature Element Unpacking and Inspection Preamplifier Location Changing Switch and Jumper Positions 40308110 Orienting the Display Board Mechanical Installation 2.4.1 General information Mounting the Model 3081 pH/ORP Transmitter on a Flat Surface Mounting on a Flat Surface. See Figure Pipe Mounting 40308103 Power Supply and Load Requirements. Refer to Figure Power SUPPLY/CURRENT LoopPower Supply-Current Loop Wiring. Refer to Figure General Information Wiring Diagrams Section WiringGeneral Information Wire Function Wiring Diagram Wiring Diagrams for pH and ORP SensorsWiring Diagrams for Model 396R Sensors Junction Box Wiring Diagrams for Model 389 Sensors Junction Box Wiring Diagrams for Model 396P Sensors Junction Box Wire Functions Wiring Diagrams for Model 385+ Sensors Junction BoxWire Functions Wiring Diagram Jumpers Supplied by Customer Section Section Section 15. Wire functions for Model 385+ 17. Wire functions for Model 328A-07 19. Wiring diagram for Model 320HP-10-55 21. Wire Functions for Model Section 24. Preparation of Raw Connecting Cable PN Sensor Flow Chart on Sensor Flow Chart on Sensor Flow Chart Explosion Proof Installations Intrinsically Safe InstallationsSection Intrinsically Safe & Explosion Proof Fmrc Installation for Model 3081 pH/ORP Transmitter Page 3081Model TransmitterpH/ORP CSA. forInstallationPage Page Displays Section Operation with Remote ControllerI T N E X T T E R Infrared Remote Controller Infrared Remote Controller IRC KEY Functions Menu Tree for pH Menu Tree ORP Diagnostic Messages ORP Entering the Security Code SecurityRetrieving a Lost Security Code Section Operation with Model Connecting the Hart Communicator Operation Menu Tree Off-line and On-line OperationFast Key Sequences Is on 2b. pH Menu Tree Hart 3a. ORP Menu Tree Hart 3b. ORP Menu Tree Hart General Using the Hold FunctionEntering and Leaving the Calibrate Menu Procedure Temperature CalibrationPurpose TEMP AdJ What Happens During Auto Calibration? Auto CalibrationUse of Calibration Standards buffers 10.00 CAL bF Manual Calibration 10.00 Meter Standardization Making the Transmitter Reading Match a Second pHWhat Happens During Standardization? Slope Std Entering and Leaving the Program Menu Programming for pH Measurements Mnemonic Display Limits Factory Settings User Settings PH Settings List Definitions Output Ranging 4MA Suggested Glass Impedance Warning and Failure Limits Diagnostic Parameters Section Gwjh GFHGwjl GFL RWJH RFHRWJL RFL Temperature Related Settings TAUtO TEMPTMAn TC 1 DISPLAY Display UnitsTYPE Code Buffer Calibration Parameters BAUtO BUFFErM E Isopotential Parameters TCOEFF 000 ISOPOtntALSnr SIM OUtPUt Generating a Test CurrentTESt Section Calibration of ORP Measurements 25.0 TEMP AdJ Std Preparation of ORP Standard Solutions Section Programming for ORP Measurements Mnemonic Display Factory User Limits Settings Program Level ORP Settings LIst Output Ranging 20MA 400 Diagnostic Parameters DIAGnOSTIC RWJH Definition Temperature Element Display Units Generating a Test Current Transmitter Maintenance Section MaintenanceOverview Frequency of Cleaning PH Sensor MaintenanceCleaning Procedures Problem Cleaning Suggestions Rejuvenating Reference Electrodes Checking the Reference Electrode Calibration 11.5.1 General ORP Sensor Maintenance 11.4.1 Frequency of CleaningCalibration Frequency Testing the Transmitter by Simulating pH Section TroubleshootingFactory Assistance and Repairs Troubleshooting is easy as 1, 2 Calibration ErrorsMessage Section Glassfail Troubleshooting Flowchart Glassfail Slope Condition of Sensor Slope Status of Sensor Troubleshooting Flowchart GLASSWArnGLASSWArn REF Fail Troubleshooting Flowchart rEF Fail Troubleshooting Flowchart- tEMP HI and tEMP LO Troubleshooting Flowchart rEF WArnREFWArn CALIbrAtE RTD Resistance Values Temperature 3K Balco Three-wire RTD LInE Fail Troubleshooting Flowchart- LInE Fail InPUt WArn Troubleshooting Flowchart-InPUt WArn Slope Err LO Troubleshooting Flowchart-SLOPE Err LO Troubleshooting Flowchart-Std Err Troubleshooting Flowchart-SLOPE Err HISlope Err HI Std Err Troubleshooting-WritE Err Troubleshooting-AdC WArn or CyCLE PWrROM Fail or CPU Fail AdC WArn or CyCLE PWr FACt Fail Symptom Section102 103 12.5.1 Id 000 in Display Sensor Does Not Respond To Known pH Changes PH Reading in Buffer Drifts During Manual Calibration104 105 Hart Communications Problems Temperature Reading Is InaccurateNo Display Display Segments Missing Replace the display board PN 106 12 .14 Transmitter Periodically Restarts Itself 12 .13 Transmitter Locks Up YES OK? Diagnostic Measurements Testing the Transmitter by Simulating the pHDiagnostic Messages 111 Voltage mV Simulate pH through Model 381+ Sensor Preamplifier 112 PH Simulation with the Model 381+ Sensor Troubleshooting Assistance PH Simulation When Preamplifier is in SensorReturn of Materials PH Measurements Reference Electrode Measuring Electrode115 116 Liquid Junction Potential Buffers and Calibration Glass Electrode SlopeTemp C Slope mV/unit pH 117 118 Junction Potential Mismatch SHIELDS, INSULATION, and Preamplifiers Sensor Diagnostics119 General Section ORP Measurements Reference Electrode Measuring ElectrodeLiquid Junction Potential 121 14.6 ORP, CONCENTRATION, and pH Relating Cell Voltage to ORP122 ORP,mV VI,Chromiumppm Sulfur dioxide added Interpreting ORP Measurements123 124 Calibration 125 Overview of Hart Communication Section Theory Remote CommunicationsHart Interface Devices AMS Main Menu Tools 127 Asset Management Solutions Term Definition Section Glossary 129 130 Hart 131 ORP 132 RTD 133 NON-WARRANTY Repair Warranty RepairSection Return of Material Return of Material Warranty ON-LINE Ordering NOW Available on OUR WEB Site