Emerson 51-DO-03, 51-DO-04 Section Troubleshooting, Overview, Measurement Section

Page 60

MODEL DO-03/04

SECTION 10.0

 

TROUBLESHOOTING

SECTION 10.0

TROUBLESHOOTING

10.1 OVERVIEW

The 54eA analyzer continuously monitors itself and the sensor for faults. When the analyzer detects a fault in the oxygen sensor or in the instrument itself it displays a fault message. If alarm 4 was enabled, the red FAIL LED will also light and relay 4 will activate. The outputs will go to 22.00 mA or to the value programmed in Section 5.5.

See Section 10.2 for an explanation of fault messages and suggested corrective actions.

The analyzer also displays error and warning messages if a calibration is seriously in error. Refer to the section below for assistance. Each section also contains hints for correcting other measurement and calibration problems.

 

Measurement

Section

 

 

Temperature

10.3

 

 

Dissolved oxygen

10.4

 

 

 

 

 

For troubleshooting not related to measurement problems, see Section 10.5.

To view diagnostic variables, go to the main display and press any key. Move the cursor to “Diagnostic variables” and press Enter (F4). Use the ￿ or ￿ key to move up or down the list.

10.2 TROUBLESHOOTING WHEN A FAULT MESSAGE IS SHOWING

 

Fault message

Explanation

See Section

 

 

High input current

input current exceeds 210 uA

10.2.1

 

 

Check sensor zero

sensor current was too high when sensor was zeroed

10.2.2

 

 

Temp error low

temperature less than -15°C

10.2.3

 

 

Temp error high

temperature greater than 130°C

10.2.3

 

 

Sense line open

RTD sense line is open

10.2.4

 

 

Failure factory

instrument needs factory calibration

10.2.5

 

 

Failure eeprom

write verify error has occurred

10.2.5

 

 

 

 

 

 

54

Image 60
Contents Dissolved Oxygen Measurement System with Air Blast Cleaner Model DO-03/04Essential Instructions Page Model DO-03/04 Measuring System Section TitleList of Tables 10.011.0 List of Figures Section TitleIii Section Specifications Features and BenefitsPower Repeatability ±0.05 ppm 25CRFI/EMI EN-61326 Output Accuracy ± 0.05 mAMaximum continuous pressure 50 psig 446 kPa abs Maximum distance between compressor and sensorMaterials of Construction Analyzer dimensions Enclosure dimensions Power required selection Description9240048-00 Tag, stainless steel, specify marking Section Installation InstallationUnpacking and Inspection Model or part number DescriptionInstalling the air compressor enclosure Installing the handrail mounting assemblyAssembling the pipe and pipe clamp Installing the sensor in the washer head assembly Attaching the pipe boom to the handrail mounting assemblyAssembling the washer head and pipe boom Attaching the air compressor enclosure to the handrail Installing the sensor in the washer head assembly Section Wiring POWER, ALARM, and Output WiringGeneral 454EPH02 Section Section Sensor Wiring Wiring the Oxygen SensorGeneral Alarm Status Section Display and OperationDisplay KEY Functions and ControlSection Software Configuration Menu Tree for the 54eA AnalyzerOn following Main Menu Calibrate See Diagnostic Variable see Program Settings List Choices Factory Settings SetpointsChoices Factory Settings Configure Choices Factory Settings Alarm setpoints Alarm 1 setpointAlarm 2 setpoint Alarm 3 setpointMA 0.00 ppm 20 mA 20.00 ppm Output 1 12.00 mA Ranging the OutputsTest alarm 1 Open Simulated testsTest output Outputs Alarms DisplayMeasure Oxygen Meas units ppmDisplay contrast Timeout On Temp units C Output 1 mA Output 2 mALanguage English Display left Display right Out Outputs Output 1 controlOutput Measurement Output 1 Setup Output 1 ControlRange 4-20 mA Dampen 0 sec Hold Last Value Configure Alarm 1 controlAlarm 1 setup Alarm 2 control Changing Alarm ParametersAlarm 1 control Alarm 1 setupAlarm Low Activate ProcessAlarm Fault Feed limit DisableTimeout 3600 sec Alarm 4 setupAlarm 4 setup Feed limit timer Interval timerTimer Disable Timer Time activated Interval 24.0 hr Interval timer setupTemperature Compensation and Temperature Units Temp comp AutoTemp units C Temp comp Manual Temp units C60 Hz Noise ReductionBar meas Auto Bar units mm HgBarometric Pressure Main sensor cal Salinity 0.0 o/ooNoise rejection Main sensor cal Security SecurityAnalyzer Mode Priority Condition DefinitionsAction Definitions Section Calibration Temperature IntroductionAdjust temp + 025.1 C Temperature CalibrationSection Calibration Dissolved Oxygen Sensor Current as a Function Dissolved Oxygen ConcentrationSensor must be in zero solution Zeroing the SensorStabilizing . . . Wait Calibrating the Sensor in AIRSection Calibrate 8.32 ppm Calibrating the Sensor Against a Standard InstrumentZero main sensor Adjust temperature Calibrate main sensorStandardize Calibrating Barometric PressureSection Calibration Current Outputs Trimming the OutputsSection Maintenance Replacement PartsCleaning the membrane Replacing electrolyte solution and membraneSection Power Fuse Spare PartsReplacement Parts Location Part Number Description AIR Blast Sensor WasherSection Troubleshooting Troubleshooting When a Fault Message is ShowingFault message Explanation See Section OverviewTemperature error low or high High input currentCheck sensor zero Sense line openTroubleshooting When no Fault Message is Showing Oxygen Problem See SectionZero current is too high Possible error warning during in-process calibration Zero reading Is unstableBarometric pressure reading is too high or too low Process readings are erratic Readings driftSensor does not respond to changes in oxygen level Oxygen readings are too lowTroubleshooting not Related to Measurement Problems Problem ActionSimulating Inputs Dissolved Oxygen Sensor Polarizing Voltage Resistance Expected currentSimulating Temperature Simulating temperatureSection Return of Material GeneralReturn of Materials Request Sensor or Circuit Board onlyWarranty Specifications subject to change without notice