Burkert 8221 Manuel Utilisateur page 7

Type 8221 Hygienic Conductivity Sensor Operating Instructions
Calibration
There are two possibilities for calibration:
1) Calibration while sensor is disassembled from process:
•
First, rinse the sensor thoroughly with deionized water.
•
Use a beaker or container that has an (internal) diameter of at least 30 mm. (The sensor
fits perfectly into the Bürkert Conductivity Standards, and can be calibrated directly in the
bottle.)
•
Use a solution of known conductivity. Check the temperature table of the conductivity
standard.
• Immerse the lower part of the sensor in the standard. Make sure that the 4 electrodes are
completely immersed. The sensor should be placed in the center of the beaker.
•
Leave the sensor for at least 5 minutes for equilibration, before initiating the calibration on
the instrument.
For precise determination of the cell constant, it is recommended that you use an assembly
situation similar or equal to the situation in the process. The cell constant may vary with the
assembly situation.
2) Calibration in the process:
• Insert the sensor in the process.
•
Leave conductivity and temperature at least 15 min. for equilibration.
•
Take a process sample and perform an external measurement with a reference
conductivity system. The best approach is to perform the measurement at a temperature
equal to that of the process. If this is not possible, you need to know the temperature
coefficient of your sample (similar to temperature table on Bürkert Conductivity Standards
bottle).
•
Manually adjust the cell constant to read the same conductivity value on the process
instrument.
•
You may switch off the temperature compensation of the process and the laboratory
instruments to prevent any errors.
Cleaning
The conductivity sensor can be cleaned with standard cleaning agents. Never use scouring
agents which contain hard particles. Please check the O-rings from time to time. When
mounting the new O-ring take care not to damage the O-ring nut or the O-ring itself.
Otherwise the tightness of seal can no longer be guaranteed.
Disposal
The design of Bürkert sensors minimizes environmental impact. According to
the EU directive 2002/96/EC the Bürkert sensors should be disposed as waste
of electrical and electronic equipment, and not in municipal waste, or it can be
sent back to Bürkert for disposal.
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