Hach-Lange POLYMETRON 9526 - Manual (Page 26)

K Calculation
Use this option to re-calculate the cell constant K value for the sensor under test.
1. Push the menu key and select SENSOR SETUP>K CALCULATION.
Option Description
K CALCULATION This option is only valid if the last sensor calibration date is within one month of the
current date. The following parameters are required:
• SITE ID—The name of the site ID is limited to 10 characters in any combination of
letters, numbers, spaces or punctuation
• CONDUCTIVITY— Enter the measurement value from the controller under test
• TEMPERATURE— Enter the sample temperature from the controller under test
• CELL K VALUE— Enter the cell constant K value from the controller under test
• CALIBRATION SLOPE— Enter the slope value from the controller under test
The new K value is calculated and displayed and should be entered into the controller
under test.
Note: The calculation will fail if the new value is outside ±10% of the original value.
K CALCULATION
LOG Lists all log files sorted by date and time. Use the arrow keys to select a log file and
push enter to view the calculation details.
RESET K CALC
LOG Enter the factory pass code and select YES to delete the existing log file. Push enter
to continue.
Maintenance
D A N G E R
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the document.
Cleaning and decontamination
D A N G E R
Always remove power from the controller before performing maintenance activities.
The analyzer does not normally require any cleaning or decontamination. If needed, clean the
exterior of the instrument with a moist cloth and a mild soap solution. Never use cleaning agents
such as turpentine, acetone or similar products to clean the instrument, including the display and any
accessories.
Clean the sensor
W A R N I N G
Chemical hazard. Always wear personal safety protection in accordance with the Material Safety Data Sheet for
the chemical that is used.
W A R N I N G
Personal injury hazard. Removal of a sensor from a pressurized vessel can be dangerous. Reduce the process
pressure to below 10 psi before removal. If this is not possible, use extreme caution. Refer to the documentation
supplied with the mounting hardware for more information.
Pre-requisite: Prepare a mild soap solution with a non-abrasive dishwashing detergent that does not
contain lanolin. Lanolin leaves a film on the electrode surface that can degrade the sensor
performance.
Examine the sensor periodically for debris and deposits. Clean the sensor when there is a buildup of
deposits or when performance has degraded.
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