Emerson Process Management 53eA Simulating Inputs Other Amperometric Measurements

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MODEL 54eA	SECTION 16.0
	TROUBLESHOOTING

16.12 SIMULATING INPUTS - OTHER AMPEROMETRIC MEASUREMENTS

To check the performance of the controller, use a decade box and a battery to simulate the current from the sen- sor. The battery, which opposes the polarizing voltage, is necessary to ensure that the sensor current has the cor- rect sign.

NOTE

It is not possible to simulate an input from a 498CL-01 sensor.

A.Disconnect the anode and cathode leads from terminals 1 and 2 on TB3 and connect a decade box and bat- tery as shown in Figure 16-2. It is not necessary to disconnect the RTD leads.

B.Set the decade box to the resistance shown in the table.

	Sensor	Polarizing Voltage	Resistance	Expected current
	499ACL-01 (free chlorine)	200 mV	28 MΩ	500 nA
	499ACL-02 (total chlorine)	250 mV	675 kΩ	2000 nA

	499ACL-03 (monochloramine)	400 mV	3 MΩ	400 nA
	499AOZ	250 mV	2.7 MΩ	500 nA

C.Note the sensor current. It should be close to the value in the table. The actual value depends of the voltage of the battery. To view the sensor current from the main display, press any key to enter the main menu. Move the cursor to "Diagnostics" and press Enter (F4). The

sensor current is the second line in the display. Note the units: μA is microamps, nA is nanoamps.

D.Change the decade box resistance and verify that the correct current is shown. Calculate current from the equation:

Vbattery - Vpolarizing (mV)

current (μA) =

resistance (kΩ)

The voltage of a fresh 1.5 volt battery is about 1.6 volt (1600 mV).

FIGURE 16-2. Simulate Chlorine and Ozone

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Contents Amperometric Hart Analyzer/Controller Model 54eAEssential Instructions Page Model 54eA ANALYZER/CONTROLLER 11.0 10.012.0 13.0Section Title List of FiguresIii Features and Applications Section SpecificationsPower Specifications GeneralOutput Accuracy ± 0.05 mA Alarms Weight/Shipping Weight 5 lb/6 lb 2 kg/2.5 kgSpecifications Free Chlorine Specifications OxygenSpecifications Total Chlorine Specifications OzoneOrdering Information 115/230 VAC, 50/60 Hz Power24 VDC Installation Section InstallationUnpacking and Inspection Pipe mounting Pipe and Wall Mounting DimensionsPanel mounting Panel Mounting DimensionsPOWER, ALARM, and Output Wiring Section WiringGeneral 454EPH02 Wiring Model 499A oxygen, chlorine, and ozone sensors Sensor WiringGeneral 4054eA01 4054eA03 4054eA02 4054eA04 4054eA07 Section Display and Operation Alarm StatusGeneral Description DisplayProgram Settings List Section Software ConfigurationChoices Factory Settings Configure Choices Factory Settings Temperature compensation Section Menu Tree for the 54eA Controller Main Menu Main Alarm 2 setpoint Alarm setpointsRanging the Outputs MA 0.00 ppm 20 mA 20.00 ppm Output 1 12.00 mAOutput setpoints Alarm setpointsSimulated test Setpoint 1.000 ppm 4mA 0.000 ppm 20mA 10.00 ppmSimulated tests Test alarm 1 OpenTest output Display ConfigureTemp units C Output 1 mA Output 2 mA Display contrast Timeout OnLanguage English Display left Display right Out Output 1 control OutputsOutput Measurement Output 1 Setup Ctrl mode NormalOutput 1 Control Range 4-20 mA Dampen 0 sec Hold Last ValueUsing hold Hold setupAlways configure the control parameters Before making Changing Alarm ParametersChanges in the alarm setup Alarm Control SettingsAlarm 1 setup Alarm 1 controlAlarm 2 control Alarm Low Setpoint 0.000 ppmHigh Alarm Low AlarmFeed limit Disable Alarm FaultTimeout 3600 sec Feed limit timer setupInterval timer Alarm 4 setup Feed limit timerTimer Disable Timer Time activated Interval 24.0 hr Interval timer setupPH sensor Disable PH sensor EnableUsing the 499ACL-01 sensor PH comp Manual PH value 7.00 pHGlass imp lo 20 MΩ Diagnostics OffAutocal Standard Operate iso 7.00 pH Sensor iso 7.00 pH Temp coeffTemp comp Auto Temperature Compensation and Temperature UnitsTemp units C Temp comp Manual Temp units CNoise Reduction 60 HzMain sensor cal Bar units mm Hg Bar meas AutoBarometric Pressure Noise rejection Main sensor cal Lock program Lock configSecurity Lock allCondition Definitions Controller Mode PriorityAction Definitions Introduction Section Calibration TemperatureTemperature Calibration Adjust temp + 025.1 CDissolved Oxygen Concentration Section Calibration Dissolved OxygenZeroing the Sensor Sensor must be in zero solutionCalibrating the Sensor in AIR Stabilizing . . . WaitSection Calibrating the Sensor Against a Standard Instrument Calibrate 8.32 ppmCalibrate main sensor Zero main sensor Adjust temperatureStandardize Calibrating Barometric PressureSensor Current as a Function of Free Chlorine Concentration Section Calibration Free Chlorine 499ACL-01Calibrate main sensor Full Scale Calibration Calibrate 1.100 ppmOutput trim Dual range calCalibrate low point Dual Slope CalibrationCalibrate high point Low point 2.000 ppmIntroduction Section Calibration Free Chlorine 498CL-01Ppm 100ppm 000 ppm Section Calibration Free Chlorine 498CL-01 Section Calibration Total Chlorine This page intentionally left blank Sensor Current as a Function of Monochloramine Concentration Section Calibration MonochloraminePpm 100ppm Sensor Current as a Function of Ozone Concentration Section Calibration OzonePpm 100ppm PH at 25C Standards Nominal pH SectionAutomatic TWO-POINT Calibration Autocal buffer10.02 pH Pt 04.00pH 25C Calibrate pointManual TWO-POINT Calibration Pt 4.00pH 25.0C 10.01 pHPt calibration Standardize pH pH slope Standardization ONE-POINT CalibrationPH slope 60.00 mV/pH Trimming the Outputs Section Calibration Current OutputsPID Control Code Section PID and TPC ControlControl Loop Adjustment and Tuning Proportional Gain Plus Integral ResetProcess Reaction Curve Method Process Reaction Curve Section Time Proportional Control TPC Mode Code Troubleshooting When a Fault Message is Showing Section TroubleshootingFault message Explanation See Section OverviewHigh input current Temperature error low or highCheck sensor zero PH low or high input voltageProblem See Section Troubleshooting When no Fault Message is Showing OxygenSense line open Failure factory and Failure eepromZero current is too high Possible error warning during in-process calibrationZero reading Is unstable Process readings are erratic Barometric pressure reading is too high or too lowReadings drift Sensor does not respond to changes in oxygen levelZero current is unstable ProblemSensor can be calibrated, but the current is too low Chlorine readings are too low Sensor does not respond to changes in chlorine levelProblem See Section Sensor does not respond to changes in monochloramine level Readings are too low Troubleshooting When no Fault Message is Showing Ozone Ozone readings are too low Sensor does not respond to changes in ozone levelTroubleshooting When no Fault Message is Showing pH Sensor does not respond to known pH changes Controller will not accept manual slope100 101 Process pH readings are noisyProblem Action Troubleshooting not Related to Measurement ProblemsSimulating Inputs Dissolved Oxygen Sensor Polarizing Voltage Resistance Expected currentSimulate Chlorine and Ozone 103 Simulating Inputs Other Amperometric MeasurementsVoltage mV PH at 25C Simulating pH input when the preamplifier is in the sensor104 Simulating temperature Simulating Temperature105 106 Measuring Reference VoltageReplacement Parts Part Number Description Section MaintenanceGeneral Section Return of MaterialWarranty Specifications subject to change without notice