Emerson 54e pH/ORP instruction manual Diagnostic Variables

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MODEL 54e pH/ORP

SECTION 8.0

 

TROUBLESHOOTING

8.1 DISPLAYING DIAGNOSTIC VARIABLES

This section explains how these helpful diagnostics can be viewed:

1.Electrode input in mV: Used to check if the signal produced by the sensor is within acceptable limits (see Figure 8-1 for typical sensor mV response at 25°C).

2.Glass impedance in M: Used to check integrity of glass electrode. Broken glass membranes will have low impedance.

3.Reference impedance in k: Used to indicate how coated the ref- erence electrode has become. Coated or plugged sensors will have high values of reference impedance.

4.Zero offset in mV: Indicates the deviation from the typical sensor response (Figure 8-1) as of the last buffer calibration. The controller compares the value at 7 pH with the ideal value of zero mV at 7 pH.

5.Slope in mV/pH: Indicates the sensitivity of the glass electrode. This number tends to drop as a sensor ages. Values below 47 are con- sidered too low for calibration.

6.Software version

Calibrate

Diagnostic Variables

Program

Use the following procedure :

1.From the main display, press any key.

2.With the down arrow key, move the cursor down to "Diagnostic Variables" and then press Enter (F4).

Exit

Input: 120 mV

Glass imped: 300 MΩ

Ref imped: 8 kΩ

Exit

Zero offset: 0 mV

pH slope: 59.02 mV/pH

Version: pH1.01

3.Diagnostic variables are displayed three at a time. More variables are viewable until the cursor (showing highlighted text) is brought down to the bottom line.

Use the down arrow key to view the items on the lower screen.

The up arrow key can be used to return to a previously viewed item .

Press the Exit (F1) key to return to the main menu above.

NOTE

Many diagnostic variables can be read directly on the main dis- play in the lower left or lower right positions. For details, see Section 5.5.

Exit

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Contents Model 54e pH/ORP PH/ORP Hart Analyzer/ControllerElectrical Shock Hazard Essential InstructionsPage Model 54E PH/ORP Microprocessor Analyzer Description and SpecificationsSection Title List of Tables Appendix TitleTable No Title About This Document Table of Contents List of FiguresGeneral Description Section Description and SpecificationsDescription of Controls Current Outputs Specifications Physical Specifications GeneralPower Relative Humidity 95%, non condensing AlarmsRecommended Sensors Analyzer Specifications @ 25CCode Options Ordering InformationPart NO. Description Unpacking and Inspection Section InstallationMechanical Installation Locating the ControllerPanel Mounting Alarm Relay Output Wiring Section WiringPower Input Wiring Analog Output Wiring454EPH02 PH Sensor Compatibility PH Sensor WiringTions will Result in Controller MALFUNC- Tion 454EPH01 Cable Dressing Final Electrical Check Wiring to Model Introduction Section CalibrationAdjust temp 25.1 C Hold Mode OffTemperature Calibration Buffer 1 -- Wait Autocal bufferAutomatic TWO-POINT Calibration Use the arrow keys to select the correct buffer Auto buffer cal doneCalibration Notes Manual TWO-POINT Calibration Calibrate pointPt 04.00pH 25C Pt calibration doneSINGLE-POINT pH Calibration Standardize 7.01 pH59.16 mV/pH Temperature Compensation OptionsTemp comp Auto Output trimOutput trim Hold ModeTrim Outputs PH Settings List Section Software ConfigurationRanges Factory Settings User Settings Diagnostics Section Outline of Menu Levels Setpoint 07.00 pH Alarm High 14.00pHChanging Alarm Setpoints Simulate testsChanging Output Setpoints PID only Setpoint 7.00 pH4mA 0.00 pH 20mA 2.00 pH Setpoint + 06.90 pHMA +00.00 pH OutputOutput MA 0.00 pH 20 mA 14.00 pH Output 1 12.00 mASimulated tests Alarm setpoints Output setpointsTest output Test alarm Testing Outputs and AlarmsTest alarm 1 Open Test alarm 1 OpenMeasure pH Display right AL2Security Caution Display contrast Timeout OnOutput Control Parameters Control ModeDisplay Changing Output ParametersRange 4-20 mAl Fault 22.00 mARange 4-20 mA Hold Disable feature Fault 22.00mAOutput 2 control Output 2 setup Hold feature setupAlarm 3 control AlarmsInterval timer Relay Default None Alarm LowSetpoint 0.01 pH Delay 0 sec Hysteresis 0.01 pH Delay 0 secURV 2.00 pH Relay default NoneSetpoint +07.00 pH Time period 30 secAlarm 4 Setup Alarm FaultFeed limit Disable Timeout 3600 secRecovery 600 sec Timer DisableOn time 120 sec Interval Timer Examples Diagnostics Off DiagnosticsZero offset 60 mV Stabilize pH 0.01 pH Stabilize time 10 sec DiagnosticsAuto Calibration Setup Autocal StandardStandard Buffers Auto Calibration SetupSection Theory of Operation Continuous Sensor DiagnosticsTypical set points Interval TimerSee .8 for instructions on chang- ing these setpoints Time Proportional Control TPC Mode Code Alarm RelaysAnalog Outputs Normal ModeAction Definitions Controller Mode PriorityController Mode Priority Chart Condition DefinitionsMeasurement and Set Point Feedback Control PID Control Mode CombinationsPID Control Code PID ControlProportional Gain Plus Integral Reset Proportional Mode GainControl Loop Adjustment and Tuning Process Reaction Curve Process Reaction Curve MethodPID Control Password Protection Section Special Procedures and FeaturesLevel 1 3 Password Privileges Lock all Configuring SecuritySecurity Custom CurveTemp coeff +.000 Solution Temperature CompensationSensor iso 07.00 pH Operate iso +07.00 pH Troubleshooting is easy as 1, 2, 3… Section TroubleshootingDiagnostic Messages Description of problem Diagnostic MessagesSymptom Action Quick Troubleshooting GuideDiagnostic Variables Theoretical pH vs. Millivolt Values at 25C 77F Ohms Ambient Temperature Troubleshooting GuidelinesTemperature Compensation Circuit Troubleshooting ProcedurePreamp in a junction box Figure Preamplifier Troubleshooting ProcedureController preamp check Figure Junction Box Preamplifier Check No Power Troubleshooting GuideCoated glass electrode Clean with soft cloth and clean water Password protected Part Number Description Replacement PartsGeneral Warranty RepairNON-WARRANTY Repair Section Return of MaterialQuick Startup ORP Appendix a ORP ConfigurationItem Choices ORP Settings User Settings Table A-1. ORP Settings ListDiagnostics Section Choices ORP Settings User SettingsSimulated tests Output setpointsORP Calibration Standardize 400 mVSensor or Circuit Board only Return of Materials RequestReturn of Material WarrantySpecifications subject to change without notice