Yokogawa EXAxt PH450 4-Wire Analyzer for pH and ORP User Manual
User’s manual
Table of contents
Document Outline
- PREFACE
- 1. INTRODUCTION AND GENERAL DESCRIPTION
- 2. GENERAL SPECIFICATIONS OF EXAxt PH450G
- 3. INSTALLATION AND WIRING
- 4. OPERATION OF EXAxt PH450G
- 4-1. Main display functions
- 4-2. Trending graphics
- 4-3. Zoom in on details
- 4-3-1. Actual mA1 = the current output in mA of the first current output, which is defined as mA1. The range and function of this mA output can be set in Commissioning >> Output setup>> mA1
- 4-3-2. Actual mA2 = the current output in mA of the second current output, which is defined as mA2. The range and function of this mA output can be set in Commissioning >> output setput >> mA2
- 4-3-3. Zero = calibrated sensor offset in mV. Theoretically the sensor reads 0 mV in a buffer solution with the same pH value as the Isopotential pH value of the sensor (default 7.00 pH). The ZERO value indicates the condition of the sensor. If the valu
- 4-3-4. Slope = calibrated efficiency of the sensor unit in percentage of theoretical slope of the sensor unit. The theoretical slope follows the NERNST equation and is 59.16 mV/pH. The SLOPE can be calibrated only after a two-point calibration in buffer so
- 4-3-5. Sensor mV = the output of the sensor unit prior to calibration and temperature compensation. This value is important for trouble shooting.
- 4-3-6. Reference impedance = the electrical resistance of the liquid junction. The liquid junction forms the electolytical contact between the reference element and the measuring electrode, so it must be kept clean and filled with conductive electrolyte. O
- 4-3-7. Last calibrated = the date on which the last sensor calibration is done. The displayed value of the ZERO is the result of this calibration. The displayed value of Slope is not necessarily calibrated on this date: only if the last calibration was a 2
- 4-3-8. Calibration due = the date when the calibration must be done according to the settings of the maintenance timer. This is based on scheduled maintenance procedures. The maintenance intervals are set in menu: setup>> Commissioning>> measurement setup>
- 4-3-9. Projected calibration = the date when the predictive maintenance function expects that recalibration of the sensor unit is necessary for good measurement accuracy. The transmitter checks the reference impedance every hour. The user is notified when
- 4-3-10. Projected replacement = the date when the predictive maintenance function expects that replacement of the sensor is necessary for good measurement accuracy. After each calibration the slope, zero and reference impedance are logged. Aging of the sen
- 4-3-11. Serial number = serial number of the transmitter
- 4-3-12. Software revision = the revision level of the software in the instrument
- 4-3-13. HART Device revision
- 4-3-14. Logbook
- 4-4. Information function
- 4-5. Setup-calibration & commissioning
- 4-6. Secondary-primary value display switch
- 4-7. Navigation of the menu structure
- 4-8. Setup Concentration mode
- 5. MENU STRUCTURE COMMISSIONING
- 6. CALIBRATION
- 7. MAINTENANCE
- 8. TROUBLESHOOTING
- 9. SPARE PARTS
- APPENDICES
- CMPL
- Revision Record