Emerson 54e pH/ORP Autocal buffer, Buffer 1 -- Wait, Automatic TWO-POINT Calibration

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MODEL 54e pH/ORP

SECTION 4.0

 

CALIBRATION

4.2 AUTOMATIC TWO-POINT CALIBRATION

The two-point calibration is performed when the controller is initially installed and whenever elements of the sensor assembly or controller are replaced. The two-point calibration re-establishes the slope of the elec- trode. This is necessary because the slope (mV/pH change) decreases as the glass pH electrode ages.

7.00pH

Hold Mode: Off

Exit

Cont

Edit

Buffer calibration Standardize pH Adjust temperature

ExitEnter

Buffer calibration uses measurements of two solutions to calculate the slope (efficiency) and the zero offset of the pH sensor.

Obtain two pH buffer solutions with different pH values. They should be at least 2 pH units apart. Unopened buffers have a shelf life of about a year and should generally not be reused because of possible contamina- tion.

Before taking readings, clean and rinse the sensor (if necessary). Shake the sensor down to remove air bubbles from the glass electrode tip. Place the sensor into the first buffer solution. Verify and adjust the temperature (Section 4.1), if necessary.

The controller is set at the factory for automatic calibration. If this feature has been disabled (Section 5.9), see Section 4.3 for manual calibration.

Auto calibration includes automatic buffer recognition (factory set buffers are 4.01, 7.00, and 10.01 pH) and a stabilization check. The stabilization feature eliminates errors caused by changes in temperature and response time of the glass electrode. To change these settings, refer to Section 5.9.

1.From the main display, press any key to obtain the main menu. With the cursor on "Calibrate", press Enter (F4). With the cursor on "Buffer calibration", press Enter (F4) again.

NOTE

The hold mode screen (top left) will appear if the hold mode was enabled in Section 5.6. Activate hold mode by pressing Edit (F4), using the arrow key to change Off to On, and then pressing Save(F4). The hold mode holds the outputs and relays in a fixed state to avoid process upsets to a control system. To leave the hold mode in it's current state, press Cont (F3).

4.02pH

Autocal buffer 1

2.With the sensor in the first buffer, press Cont (F3). To cancel the cal- ibration, press Abort (F1).)

The word "Wait" flashes until the sensor is stabilized.

Abort Cont

4.02pH

Buffer 1 -- “Wait”

The controller is waiting for the pH reading to stabilize within the parameters established in Section 5.9. If the controller appears to be locked at this stage, the reading is not stable enough. Increase the stabilize pH and/or decrease the stabilize time and retry the calibra- tion.

Press Abort (F1) to cancel the calibration if it appears to be taking too long.

Abort Cont

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Contents PH/ORP Hart Analyzer/Controller Model 54e pH/ORPEssential Instructions Electrical Shock HazardPage Model 54E PH/ORP Microprocessor Analyzer Description and SpecificationsSection Title List of Tables Appendix TitleTable No Title Table of Contents List of Figures About This DocumentGeneral Description Section Description and SpecificationsDescription of Controls Relative Humidity 95%, non condensing Alarms Specifications Physical Specifications GeneralPower Current OutputsAnalyzer Specifications @ 25C Recommended SensorsCode Options Ordering InformationPart 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 Compatibility PH Sensor WiringTions will Result in Controller MALFUNC- Tion 454EPH01 Cable Dressing Final Electrical Check Wiring to Model Section Calibration IntroductionAdjust 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 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/pHOutput trim Hold ModeTrim 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 ParametersRange 4-20 mAl Fault 22.00 mARange 4-20 mA Hold feature setup Fault 22.00mAOutput 2 control Output 2 setup Hold Disable featureAlarm 3 control AlarmsInterval 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 SetupRecovery 600 sec Timer DisableOn time 120 sec Interval Timer Examples Diagnostics Off DiagnosticsZero 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 OperationTypical set points Interval TimerSee .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 Gain Plus Integral Reset Proportional Mode GainControl Loop Adjustment and Tuning Process Reaction Curve Method Process Reaction CurvePID Control Password Protection Section Special Procedures and FeaturesLevel 1 3 Password Privileges Custom Curve Configuring SecuritySecurity Lock allTemp coeff +.000 Solution Temperature CompensationSensor 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 TemperaturePreamp in a junction box Figure Preamplifier Troubleshooting ProcedureController 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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