Hanna-instruments HI 903 Manual de usuario descargar pdf (Pagina 124)

8-8

MAINTENANCE, PERIPHERALS

8.3 Peripherals

Warning!

Connection/disconnection of POWER CORD, PUMP ASSEMBLY, EXTERNAL PC

DISPLAY, PRINTER, RS232 INTERFACE or EXPANSION DEVICE must be done

only when titrator and external devices are turned off.

8.2 Probe Maintenance

Proper probe maintenance is crucial for reliable measurements and extending the life

of the probe. The frequency of maintenance will depend largely on the type of samples

that are analyzed. Maintenance may be required if any of the following are observed:

• Slow or no electrode response;

• Noisy mV readings;

• Debris on or between electrode pins

• Coating on electrode pins

If these signs are observed, the electrode pins may be dirty. Rinse the electrode with

a solvent that is appropriate for the type of sample used – methanol is usually sufficient.

Allow the probe to dry completely before re-installing.

If a more thorough cleaning is required, soak the electrode in HI 7061 Electrode

Cleaning Solution for General Use for several hours, then rinse with water followed by

methanol. Allow to dry before re-installing.

After allowing the probe to dry, inspect the glass cracks, especially near the electrode

pins. Replace the electrode if any cracks are found.

Warning: Take care to protect the electrode pins from damage! Avoid using brushes/

abrasives to clean the pins. Pins can easily bend, which will cause permanent

errors in mV readings!

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Hanna-instruments HI 903 Manual de usuario Pagina 124