Emerson 54e pH/ORP instruction manual Quick Troubleshooting Guide, Symptom Action

Page 66

MODEL 54e pH/ORP

 

SECTION 8.0

 

 

TROUBLESHOOTING

TABLE 8-2. Quick Troubleshooting Guide

 

 

 

SYMPTOM

 

ACTION

 

 

pH reading won't change in different buffers.

Clean the electrode, check wiring. Replace electrode.

 

 

 

"Cracked glass failure".

1.

Replace electrode if cracked.

 

2.

Check wiring for short.

 

 

pH sensor has sluggish response.

Clean the electrode; if still sluggish soak in 1% HCl for 1 hr.

 

Replace electrode if not rejuvenated by the HCl soak.

 

 

"Old glass warning".

Check sensor in buffers; replace if calibration unsuccessful.

 

 

 

"Lo or Hi slope error".

1.

Verify internal preamp switch is in the appropriate position.

 

2.

Improper buffer calibration: check buffer accuracy; wait for reading

 

 

to stabilize;

 

3.

Clean the electrode; if fault persists; replace electrode.

 

4.

If new electrode doesn't resolve the fault; replace preamp.

 

 

"Calibration warning".

Check sensor in buffers; replace if calibration unsuccessful.

 

 

 

"Wait" flashing continuously; won't stabilize

1.

Readjust stabilization pH or time for Auto Cal (Section 5.9)

during Auto Buffer Calibration.

2.

Clean the sensor and retry Auto Cal in buffers.

 

3.

Try a Manual Buffer Calibration. (see Section 5.9 for configuration)

 

 

 

Calibrates in buffers but not in the process

1.

Verify process reading to be correct

 

2.

Possible ground loop. Make sure that the shield wires do NOT

 

 

touch grounded metal. (Process noise).

 

 

 

Incorrect temperature reading.

1.

Standardize the temperature

Suspected temp. compensation problem.

2.

Verify sensor's RTD resistance vs. temperature

"Temp. error high"

3.

Verify temperature reading to be correct

"Temp. error low"

 

 

 

 

Display segments missing.

Replace Display board.

 

 

Analyzer locks up; won't respond.

Replace CPU board.

 

 

Erratic display and relays chattering.

Check alarm set points, configuration (Sections 5.2, 5.7)

 

 

Analyzer not responding to key presses.

Verify and clean ribbon cable connection on CPU board.

Key press gives wrong selection.

Replace enclosure door/keyboard assembly.

 

 

 

Wrong or no current output.

1.

Verify that output is not being overloaded (max load is 600 ohms)

 

2.

Rerange outputs (Section 3.3)

 

3.

Replace Power board

 

 

No display or indicators.

Verify that the removable fuse module is securely seated.

 

 

Alarm relay closure problems.

Check Power board.

Power board cut-off.

Replace the Power board.

 

 

 

Sensor diagnostics faults keep appearing

1.

Calibrate sensor in buffers; replace if unsuccessful

 

2.

Check the diagnostic variables for inappropriate settings (Section 5.8)

 

3.

Turn analyzer diagnostics "OFF" (Section 5.8)

 

4.

Verify proper wiring and preamp switch position.

 

5.

Perform Systematic Troubleshooting procedures.

 

 

 

60

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Contents PH/ORP Hart Analyzer/Controller Model 54e pH/ORPEssential Instructions Electrical Shock HazardPage Description and Specifications Model 54E PH/ORP Microprocessor AnalyzerSection Title Appendix Title List of TablesTable No Title Table of Contents List of Figures About This DocumentSection Description and Specifications General DescriptionDescription of Controls Relative Humidity 95%, non condensing Alarms Specifications Physical Specifications GeneralPower Current OutputsAnalyzer Specifications @ 25C Recommended SensorsOrdering Information Code OptionsPart NO. Description Locating the Controller Section InstallationMechanical Installation Unpacking and InspectionPanel Mounting Analog Output Wiring Section WiringPower Input Wiring Alarm Relay Output Wiring454EPH02 PH Sensor Wiring PH Sensor CompatibilityTions will Result in Controller MALFUNC- Tion 454EPH01 Cable Dressing Final Electrical Check Wiring to Model Section Calibration IntroductionHold Mode Off Adjust temp 25.1 CTemperature Calibration Autocal buffer Buffer 1 -- WaitAutomatic TWO-POINT Calibration Auto buffer cal done Use the arrow keys to select the correct bufferCalibration Notes Pt calibration done Calibrate pointPt 04.00pH 25C Manual TWO-POINT CalibrationStandardize 7.01 pH SINGLE-POINT pH CalibrationOutput trim Temperature Compensation OptionsTemp comp Auto 59.16 mV/pHHold Mode Output trimTrim Outputs Section Software Configuration PH Settings ListRanges Factory Settings User Settings Diagnostics Section Outline of Menu Levels Simulate tests Alarm High 14.00pHChanging Alarm Setpoints Setpoint 07.00 pHSetpoint + 06.90 pH Setpoint 7.00 pH4mA 0.00 pH 20mA 2.00 pH Changing Output Setpoints PID onlyMA 0.00 pH 20 mA 14.00 pH Output 1 12.00 mA OutputOutput MA +00.00 pHTesting Outputs and Alarms Alarm setpoints Output setpointsTest output Test alarm Simulated testsTest alarm 1 Open Test alarm 1 OpenDisplay right AL2 Measure pHDisplay contrast Timeout On Security CautionChanging Output Parameters Control ModeDisplay Output Control ParametersFault 22.00 mA Range 4-20 mAlRange 4-20 mA Hold feature setup Fault 22.00mAOutput 2 control Output 2 setup Hold Disable featureAlarms Alarm 3 controlInterval timer Hysteresis 0.01 pH Delay 0 sec Alarm LowSetpoint 0.01 pH Delay 0 sec Relay Default NoneTime period 30 sec Relay default NoneSetpoint +07.00 pH URV 2.00 pHTimeout 3600 sec Alarm FaultFeed limit Disable Alarm 4 SetupTimer Disable Recovery 600 secOn time 120 sec Interval Timer Examples Diagnostics Diagnostics OffZero offset 60 mV Autocal Standard DiagnosticsAuto Calibration Setup Stabilize pH 0.01 pH Stabilize time 10 secAuto Calibration Setup Standard BuffersContinuous Sensor Diagnostics Section Theory of OperationInterval Timer Typical set pointsSee .8 for instructions on chang- ing these setpoints Alarm Relays Time Proportional Control TPC Mode CodeNormal Mode Analog OutputsCondition Definitions Controller Mode PriorityController Mode Priority Chart Action DefinitionsPID Control PID Control Mode CombinationsPID Control Code Measurement and Set Point Feedback ControlProportional Mode Gain Proportional Gain Plus Integral ResetControl Loop Adjustment and Tuning Process Reaction Curve Method Process Reaction CurvePID Control Section Special Procedures and Features Password ProtectionLevel 1 3 Password Privileges Custom Curve Configuring SecuritySecurity Lock allSolution Temperature Compensation Temp coeff +.000Sensor iso 07.00 pH Operate iso +07.00 pH Section Troubleshooting Troubleshooting is easy as 1, 2, 3…Diagnostic Messages Diagnostic Messages Description of problemQuick Troubleshooting Guide Symptom ActionDiagnostic Variables Theoretical pH vs. Millivolt Values at 25C 77F Troubleshooting Procedure Troubleshooting GuidelinesTemperature Compensation Circuit Ohms Ambient TemperaturePreamplifier Troubleshooting Procedure Preamp in a junction box FigureController preamp check Figure Junction Box Preamplifier Check Troubleshooting Guide No PowerCoated glass electrode Clean with soft cloth and clean water Password protected Replacement Parts Part Number DescriptionSection Return of Material Warranty RepairNON-WARRANTY Repair GeneralAppendix a ORP Configuration Quick Startup ORPTable A-1. ORP Settings List Item Choices ORP Settings User SettingsChoices ORP Settings User Settings Diagnostics SectionOutput setpoints Simulated testsStandardize 400 mV ORP CalibrationReturn of Materials Request Sensor or Circuit Board onlyWarranty Return of MaterialSpecifications subject to change without notice
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