Emerson 54e pH/ORP instruction manual Section Calibration, Introduction

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MODEL 54e pH/ORP	SECTION 4.0
	CALIBRATION

SECTION 4.0

CALIBRATION

The following procedures are described in this section:

•Temperature Calibration (Section 4.1)

•Auto Buffer (Two-Point) Calibration (Section 4.2)

•Manual Two-Point Calibration (Section 4.3)

•Single-Point pH Calibration (Section 4.4)

•Temperature Compensation Options (Section 4.5)

•pH Slope Adjustment (Section 4.6)

•Hold Mode (Section 4.7)

INTRODUCTION

Calibration is the process of adjusting or standardizing the controller to a lab test (such as free acid titration) or a calibrated laboratory instrument, or standardizing to some known reference (such as a commercial pH buffer). Calibration ensures that the controller shows an accurate, and therefore, repeatable reading of pH or temperature.

Since pH measurements are affected by temperature, the Model 54e pH/ORP reads the temperature at the sensor and compensates for the changing temperature by referencing all pH measurements to 25°C (77 °F).

This compensates for temperature-related changes in the response of the glass pH electrode which would affect the pH measurement. The pH temperature com- pensation does not account for changes in chemical activity which affect the actual pH value of the solution being measured. See Section 7.0 for information on solution temperature compensation.

To ensure the controller's accuracy, it is important to perform all the calibration procedures provided in this section if you are:

•installing this unit for the first time

•changing or replacing electrodes or sensor ele- ments

•troubleshooting

IMPORTANT

Before attempting to calibrate, inspect the pH sensor assembly. It must be clean, undamaged and free from cracks or other signs of leakage or wear.

WARNINGS

Before performing any of these procedures, be sure to disable or disconnect the chemical feed pumps or other external devices (see placing controller in hold, Section 4.7)

Perform the calibration procedures in this section only in the order they are given.

Do not attempt to calibrate the controller if the fault LED is lit or the display is showing fault messages.

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Contents PH/ORP Hart Analyzer/Controller Model 54e pH/ORPEssential Instructions Electrical Shock HazardPage Section Title Description and SpecificationsModel 54E PH/ORP Microprocessor Analyzer Table No Title Appendix TitleList of Tables Table of Contents List of Figures About This DocumentDescription of Controls Section Description and SpecificationsGeneral Description Specifications Physical Specifications General PowerRelative Humidity 95%, non condensing Alarms Current OutputsAnalyzer Specifications @ 25C Recommended SensorsPart NO. Description Ordering InformationCode Options Section Installation Mechanical InstallationLocating the Controller Unpacking and InspectionPanel Mounting Section Wiring Power Input WiringAnalog Output Wiring Alarm Relay Output Wiring454EPH02 Tions will Result in Controller MALFUNC- Tion PH Sensor WiringPH Sensor Compatibility 454EPH01 Cable Dressing Final Electrical Check Wiring to Model Section Calibration IntroductionTemperature Calibration Hold Mode OffAdjust temp 25.1 C Automatic TWO-POINT Calibration Autocal bufferBuffer 1 -- Wait Calibration Notes Auto buffer cal doneUse the arrow keys to select the correct buffer Calibrate point Pt 04.00pH 25CPt calibration done Manual TWO-POINT CalibrationStandardize 7.01 pH SINGLE-POINT pH CalibrationTemperature Compensation Options Temp comp AutoOutput trim 59.16 mV/pHTrim Outputs Hold ModeOutput trim Section Software Configuration PH Settings ListRanges Factory Settings User Settings Diagnostics Section Outline of Menu Levels Alarm High 14.00pH Changing Alarm SetpointsSimulate tests Setpoint 07.00 pHSetpoint 7.00 pH 4mA 0.00 pH 20mA 2.00 pHSetpoint + 06.90 pH Changing Output Setpoints PID onlyOutput OutputMA 0.00 pH 20 mA 14.00 pH Output 1 12.00 mA MA +00.00 pHAlarm setpoints Output setpoints Test output Test alarmTesting Outputs and Alarms Simulated testsTest alarm 1 Open Test alarm 1 OpenDisplay right AL2 Measure pHDisplay contrast Timeout On Security CautionControl Mode DisplayChanging Output Parameters Output Control ParametersRange 4-20 mA Fault 22.00 mARange 4-20 mAl Fault 22.00mA Output 2 control Output 2 setupHold feature setup Hold Disable featureInterval timer AlarmsAlarm 3 control Alarm Low Setpoint 0.01 pH Delay 0 secHysteresis 0.01 pH Delay 0 sec Relay Default NoneRelay default None Setpoint +07.00 pHTime period 30 sec URV 2.00 pHAlarm Fault Feed limit DisableTimeout 3600 sec Alarm 4 SetupOn time 120 sec Timer DisableRecovery 600 sec Interval Timer Examples Zero offset 60 mV DiagnosticsDiagnostics Off Diagnostics Auto Calibration SetupAutocal Standard Stabilize pH 0.01 pH Stabilize time 10 secAuto Calibration Setup Standard BuffersContinuous Sensor Diagnostics Section Theory of OperationSee .8 for instructions on chang- ing these setpoints Interval TimerTypical set points Alarm Relays Time Proportional Control TPC Mode CodeNormal Mode Analog OutputsController Mode Priority Controller Mode Priority ChartCondition Definitions Action DefinitionsPID Control Mode Combinations PID Control CodePID Control Measurement and Set Point Feedback ControlControl Loop Adjustment and Tuning Proportional Mode GainProportional Gain Plus Integral Reset Process Reaction Curve Method Process Reaction CurvePID Control Level 1 3 Password Privileges Section Special Procedures and FeaturesPassword Protection Configuring Security SecurityCustom Curve Lock allSensor iso 07.00 pH Solution Temperature CompensationTemp coeff +.000 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 Guidelines Temperature Compensation CircuitTroubleshooting Procedure Ohms Ambient TemperatureController preamp check Figure Preamplifier Troubleshooting ProcedurePreamp in a junction box Figure Junction Box Preamplifier Check Troubleshooting Guide No PowerCoated glass electrode Clean with soft cloth and clean water Password protected Replacement Parts Part Number DescriptionWarranty Repair NON-WARRANTY RepairSection Return of Material 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