Ionode IJ pH V5.1 - Manual (Page 35)

Ionode IJ Instruction Manual 35
different potentials and irreversible redox
couples.
4) Use only a high impedance mV meter.
5) Use fresh standards.
6) Use polyethylene, Teflon
™ or glass
beakers and stir with a magnetic Teflon
™
coated stirrer bar.
5.3. Maintenance
1) When not in use, store the electrode in 2-
3M KCl. This assists in maintaining a stable
reference potential and is preferred to
distilled water or an ORP standard.
2) How often does the sleeve electrolyte need
replacing? This depends on the sample
being measured and the desired accuracy.
It is best determined by experience. An
error can be determined by comparing
readings before and after renewal of the
electrolyte on the same sample.
3) For long term storage, remove and clean
the sleeve. Replace the sleeve without
electrolyte and attach the wetting cap filled
with 20% Potassium chloride solution.
5.3.1. Cleaning
Refer to 4.4.1 pH Cleaning
Metals (e.g. copper and zinc) that have plated
onto the platinum tip can be removed with dilute
(approx 0.1M) nitric acid.