Maintenance - Hach Polymetron 9526 Manuel D'utilisation De Base

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
K CALCULATION
K CALCULATION
LOG
RESET K CALC
LOG

Maintenance

Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the document.
Cleaning the controller
Always remove power from the controller before performing maintenance activities.
Note: Never use flammable or corrosive solvents to clean any part of the controller. Use of these solvents may
degrade the environmental protection of the unit and may void the warranty.
1. Make sure the controller cover is securely closed.
2. Wipe the controller exterior with a cloth dampened with water, or with a mixture of water and mild
detergent.
Clean the sensor
Chemical hazard. Always wear personal safety protection in accordance with the Material Safety Data Sheet for
the chemical that is used.
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.
18 English
Description
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.
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.
Enter the factory pass code and select YES to delete the existing log file. Push enter
to continue.
D A N G E R
D A N G E R
W A R N I N G
W A R N I N G