Emerson PN 51-1055pHC/rev.K instruction manual Calibrating AN IN-SERVICE Sensor Conductivity

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FIGURE 6-2. Calibration Against a Standard Cell
To ensure adequate flow past the sensor during calibration, take the sample downstream from the sensor. For best results, use a flow-through standard cell. If the process tem- perature is much different from ambient, keep connecting lines short and insulate the flow cell.

MODEL SOLU COMP II

SECTION 6.0

 

CALIBRATION

6.8 CALIBRATING AN IN-SERVICE SENSOR — CONDUCTIVITY

6.8.1 Purpose

1.After a conductivity sensor has been in service for a period of time, recalibration may be necessary.

2.There are three ways to calibrate a sensor.

a.Use a standard instrument and sensor to measure the conductivity of the process stream. It is not necessary to remove the sensor from the process piping. See Figure 6-2. The temper- ature correction used by the standard instru- ment may not exactly match the temperature correction used by the Solu Comp II. To avoid

errors, turn off temperature correction in the both the analyzer and the standard instru- ment.

b. Place the sensor in a solution of known conduc- tivity and make the analyzer reading match the conductivity of the standard solution. Use this

method if the sensor can be easily removed from the process piping and a standard is available. Be care- ful using standard solutions having conductivity less than 100 µS/cm. Low conductivity standards are high- ly susceptible to atmospheric contamination. Avoid calibrating sensors with 0.01/cm cell constants against conductivity standards in the range 100 to 300 µS/cm. The resistance of these solutions may be too low for an accurate measurement. Calibrate sensors with 0.01/cm cell constant using method c. For addition- al information, see ASTM D5391.

c.To calibrate a 0.01/cm sensor, check it against a standard instrument and 0.01/cm sensor while both sen- sors are measuring water having a conductivity between 5 and 10 µS/cm. To avoid drift caused by absorp- tion of atmospheric carbon dioxide, saturate the sample with air before making the measurements.

6.8.2Procedure-Calibration against a standard meter and cell

1.Calibration against a standard meter and cell transfers the calibration of the standard instrument to the process instrument.

2.Calibrate the standard meter and cell using an accepted procedure, for example ASTM D 1125, Standard Methods 2510, or equivalent. A portable, calibrated standard meter and cell is available from Rosemount Analytical (Model Number 1055C-01-99SQ SQ6053).

3.Most conductivity instruments automatically correct measured conductivity to the value at 25°C. Different instruments may apply slightly different temperature corrections. To avoid errors during calibration, turn off automatic temperature correction in both the analyzer and the standard meter.

NOTE

If a portable reference meter is not available and the conductivity of the grab sample must be determined in the laboratory, temperature correction in both the Solu Comp II and the laboratory instrument MUST REMAIN ON. Be sure that the reference instrument and the Solu Comp II are applying the same temperature correction.

4. Turn off temperature correction.

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Contents Model Solu Comp Essential Instructions Quick Start Guide ORP Quick Reference Guide Model Solu Comp Table of Contents CONT’D List of TablesList of Figures IiiAbout This Document Section Description and Specifications Dimensions Terminal Connections Rating 26-14 AWG wire sizeHazardous Location Ordinary Location -68 onlyPerformance Specifications Analyzer Conductivity InputRecommended Sensors for Conductivity Range, µS/cm Cell constant, /cmToroidal Conductivity Codes -21 and/or Measurement Range see table belowPerformance Specifications Analyzer ORP Input Temperature Correction none requiredWhen used with conductivity -20-32 or Recommended Sensors for ORPFrequency Range 0.5 4000 Hz Recommended SensorsRepeatability ±1% Loop Specifications with a Model 499A OZ Sensor Recommended SensorInput filter 1- 255 samples Measurement Range 0-10 ppm mg/LOrdering Information Model 1055 Solu Comp II AnalyzerCombination Guide Part Number Description Weight Section Installation InstallationUnpacking and Inspection General InformationPanel Mount Installation Panel MountingPipe Mount Installation Pipe MountingSurface Mount Installation Surface MountingPOWER, ALARM, OUTPUT, and Sensor Connections Section WiringPreparing Conduit Openings Model Solu Comp Section Wiring Model Solu Comp Section Wiring 41055105 41055106 41055107 41055108 41055109 41055110 40105536 40105559 Display Section Display and OperationKeypad Programming and Calibrating the Solu Comp II Tutorial Using Hold SecuritySection Programming the Analyzer Default Settings Output Dampening Or 4 mA Mode SectionAlarm Section Sensors Output SectionDefault Settings Definitions Assigning Outputs 1Choose Output Configure Choose Output1 or Output2Choose 4-20 mA or 0-20 mA Choose Output Range. Choose Output1 or Output2Alarm Relays Must be Configured Before Assigning Setpoints Choose Alarm Configure Choose Measurement or TempChoose Alarm Setpoints Definitions pH/ORP Definitions conductivity/resistivity Choose Measurement Choose Soln Temp Corr or Sensor IsoptntlDefinitions pH OutputsAlarms Measurement Choose Noise Rejection Choose ResetAnalyzer Procedure Choosing a Language Choose Default DisplayProcedure Changing Screen Contrast Section Calibration IntroductionCalibrating Temperature Procedure PH at 25C Standards Nominal pH Calibration Slope and OffsetChoose Measurement Choose BufferCal EnterManual Calibration pH S1ManualCal? Standardization pH Choose Measurement Choose StandardizeEntering a Known Slope Value pH Preparation of ORP standard solutions ORP CalibrationCalibrating AN IN-SERVICE Sensor Conductivity Procedure-Calibration against a standard meter and cellChoose Measurement Choose InProcess Procedure-Calibration against a standard solution ProgramDisplay Calibrate? Placing a NEW Sensor in Service Conductivity Choose Measurement Choose CellConstCalibrating the Analyzer Conductivity Cell constant Conductivity µS/cm Resistor k ΩTo Reset the Factory Resistance CALIBRATION, see Section Section Maintenance Replacement PartsOverview Model Description See FigureExploded View of Solu Comp II Panel Mount Version Exploded View of Solu Comp II Pipe/Surface Mount Version Section Troubleshooting Overview Troubleshooting Using Fault CodesSimulating Inputs Conductivity Simulating Temperature Absolute Value of Measured Voltage Exceeds 2500 mVPH Sensitive Glass Membrane is Broken Conductivity Sensor Open or ShortedRTD Sense Line for Sensor 1 or Sensor 2 is Open Eeprom FailureProblem See Section Calibration Error During Two-Point CalibrationInvalid Input While Manually Entering Slope Calibration Error during StandardizationSensor Does Not Respond to Known pH Changes Model Solu Comp Section Troubleshooting Calibration Error Using Standard Resistors Alarm Relays Do Not Work Measurement seems wrongConductivity, µS/cm Cell constant, /cm Current Output Too LowGeneral Simulating pH input when the preamplifier is in the sensorPreamplifier is in the Sensor Set the temperature correction to raw Section Simulating Inputs ConductivitySimulating temperature Three-Wire RTD ConfigurationMeasuring Reference Voltage Checking for a Poisoned Reference ElectrodeWarranty Repair NON-WARRANTY RepairSection Return of Material GeneralWarranty Specifications subject to change without notice

PN 51-1055pHC/rev.K specifications

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