Emerson 51-DO-03, DO-04 Section Maintenance, Oxygen Sensor Model 499ADO-54, Replacement Parts

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MODEL DO-03/04	SECTION 9.0
	MAINTENANCE

SECTION 9.0

MAINTENANCE

9.1 ANALYZER (MODEL 54eA-01)

The Model 54eA-01 analyzer provided with the Model DO-03/04 system requires little routine maintenance.

Clean the analyzer enclosure and front panel by wiping with a clean soft cloth dampened with water. A mild deter- gent solution can also be used. Do not use solvents, like alcohol, that might cause a buildup of static charge.

Table 9-1 gives a list of replacement parts.

TABLE 9-1. Replacement Parts

	PART NUMBER	DESCRIPTION
	23540-05	Enclosure, Front with Keyboard
	23848-00	Power Supply Circuit Board Shield
	23849-00	Half Shield, Power Supply
	23969-02	PCB, CPU and power supply, calibrated, 115/230 Vac
	23969-06	PCB, CPU and power supply, calibrated, 24 Vdc
	33281-00	Hinge Pin
	33286-00	Gasket, Front Panel
	33293-00	Enclosure, Rear
	9010377	Back-lit Display, LCD Dot Matrix
	9510048	Enclosure Conduit Plug, 1/2 inch

9.2 OXYGEN SENSOR (MODEL 499ADO-54)

9.2.1 General

The oxygen sensor requires little maintenance. Generally, the sensor needs attention when the response be- comes sluggish or noisy or when readings drift following calibration.

9.2.2 Cleaning the membrane

Although the air blast cleaner does a good job of keeping the membrane clean, a thin film of slime can eventual- ly accumulate on the membrane. Slime can be removed by rinsing the membrane with clean water. A soft cloth or tissue can also be used to wipe the membrane.

9.2.3 Replacing electrolyte solution and membrane

To replace the membrane or fill solution, the sensor must first be removed from the air blast washer head assem- bly.

To remove the sensor from the air blast cleaner …

1.A pair of O-rings and a set screw hold the two parts of the sensor washer head assembly together. Remove the set screw and pull on the bottom of the assembly until it is clear. The quick disconnect for the air hose should be easily accessible.

2.Disconnect the air hose by pressing on the metal tab of the fitting and pulling the hose away from the base.

3.Unscrew the base from the sensor. DO NOT LOSE THE O-RING THAT SEALS THE SENSOR TO BOTTOM ASSEMBLY.

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Contents Dissolved Oxygen Measurement System with Air Blast Cleaner Model DO-03/04Essential Instructions Page Model DO-03/04 Measuring System Section Title11.0 List of Tables10.0 Iii List of FiguresSection Title Section Specifications Features and BenefitsPower Repeatability ±0.05 ppm 25CRFI/EMI EN-61326 Output Accuracy ± 0.05 mAMaterials of Construction Maximum continuous pressure 50 psig 446 kPa absMaximum distance between compressor and sensor Analyzer dimensions Enclosure dimensions 9240048-00 Tag, stainless steel, specify marking Power required selectionDescription Section Installation InstallationUnpacking and Inspection Model or part number DescriptionAssembling the pipe and pipe clamp Installing the air compressor enclosureInstalling the handrail mounting assembly Assembling the washer head and pipe boom Installing the sensor in the washer head assemblyAttaching the pipe boom to the handrail mounting assembly Attaching the air compressor enclosure to the handrail Installing the sensor in the washer head assembly General Section WiringPOWER, ALARM, and Output Wiring 454EPH02 Section Section General Sensor WiringWiring the Oxygen Sensor 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 output Test alarm 1 OpenSimulated tests Outputs Alarms DisplayMeasure Oxygen Meas units ppmLanguage English Display left Display right Out Display contrast Timeout OnTemp units C Output 1 mA Output 2 mA Output Measurement OutputsOutput 1 control Range 4-20 mA Dampen 0 sec Hold Last Value Output 1 SetupOutput 1 Control 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 ReductionBarometric Pressure Bar meas AutoBar units mm Hg Main sensor cal Salinity 0.0 o/ooNoise rejection Main sensor cal Security SecurityAction Definitions Analyzer Mode PriorityCondition 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 openZero current is too high Troubleshooting When no Fault Message is Showing OxygenProblem See Section Barometric pressure reading is too high or too low Possible error warning during in-process calibrationZero reading Is unstable 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