Polymetron SODIMAT 9073, Инструкция по эксплуатации

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SODIMAT - Model 9073
7-1
Chapter 7 : Maintenance
7.1 Normal operating maintenance
3
Weekly
- Check the levels and complete if
necessary :
/
the calibration solution
/
the conditioning reagent
/
the electrolyte (KCl)
3
Monthly
-Check visually the filter cartridge. Change
it if saturated.
3
Half yearly
- Check the flowmeter calibration : weigh
the liquid drained during 10 minutes.
- Check the temperature sensor calibration
: with a precision thermometer placed in the
measuring electrode side.
7.2 Specific operating maintenance
7.2.1 Electrode slope loss
The sodium selective electrode may lose
part of its sensitivity naturally or because
of clogging (for instance, metallic oxides).
The following procedure permits to
recover part of the electrode sensitivity.
However, the electrode may not recover
enough characteristics (slope < 80% of
the theoric slope), it is then required to
change the electrode.
How to reactivate your electrode
ì
Immerse half of the measuring
electrode in a demineralized solution with
2% of hydrofluoric acid for 5 to 10
seconds.
L
Be careful when using acids. See the
security datasheet in appendix C, § C-
2.
í
Rinse immediately and abundantly the
electrode with demineralized water.
î
Put the electrode in a NaCl solution for
a couple of hours before putting it back
into the cell.