Oakton ION 5 Acorn Series, Руководство по эксплуатации

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6. Electrode care and maintenance
Ion selective electrode care
For Ion Selective Electrode care, consult the instruction manual included with
your electrode.
pH electrode care (ION 6 meter only)
Storage
For best results, keep the pH bulb wet. Store the pH bulb in the electrode soaker
bottle filled with electrode storage solution. Or you can store the electrode in a
pH 4 buffer with 1/100 part saturated KCl. Other pH buffers are also suitable for
storage. NEVER use deionized water for storage.
After measuring
1. Rinse the pH electrode and reference junction in deionized water.
2.
Store the electrode as recommended in "Storage" or as recommended
by the manufacturer.
pH electrode cleaning
Because your pH electrode is susceptible to dirt and contamination, clean it every
one to three months depending on extent and condition of use.
Clean the electrode in a mild detergent solution. Wipe the probe with a soft tissue
paper. Avoid touching the glass membrane with your fingers. Wash thoroughly
in tap water and then in distilled water. Recalibrate your meter after cleaning
the electrode.
Special Cleaning Tips
Salt deposit: dissolve the deposit by immersing the pH electrode in tap water for
ten to fifteen minutes. Then thoroughly rinse with distilled water.
Oil/grease film: wash electrode pH bulb gently in detergent solution. Rinse
electrode tip with distilled water.
Clogged reference junction: heat a diluted KCl solution for 60-80°C. Place the
sensing part of the pH electrode into the heated solution for about 10 minutes.
Allow the electrode to cool in some unheated KCl solution.
Protein deposits: prepare a 1% pepsin solution in 0.1M of HCl. Set the pH electrode
in the solution for five to ten minutes. Rinse the electrode with distilled water.
7. Troubleshooting
Problem Cause Solution
“Ur” or “Or” measurement over (Or) or —
on LCD Under (Ur) range.
Bad electrode Change electrode
Bad temperature Change temperature
sensor sensor
Er1 flashes Wrong or contaminated Use fresh buffer
on LCD buffer used during solution: pH 4.01, 7.00,
(ION 6 meter only) calibration or 10.00
Bad electrode Change electrode
Er2 flashes Ion calibration mode perform ion calibration to
on LCD exited before completing at least two points
two-point calibration
Er3 flashes Slope of ion selective Recondition or replace
on LCD electrode lower than 40 mV/ ion selective electrode
decade (mono valence) or
15 mV/decade (di valence)
Er4 flashes Calibration values more than Recalibrate with standards
on LCD one decade apart one decade apart
LO annunciator Low battery Replace batteries
on LCD with fresh set
No display Batteries not Insert batteries
in place
Batteries not in Re-insert batteries
correct polarity (+ and -) with correct polarity
Weak batteries Replace batteries
Unstable Electrode not deep Place electrode
reading enough in sample deeper in sample
Insufficient Fill electrode with
reference electrolyte reference electrolyte
in electrode (if electrode is refillable);
replace electrode.
Broken electrode Replace electrode
External “noises” or Remove or switch off
induction caused by interfering motor
by nearby electric motor
Dirty electrode Clean electrode
Slow response Dirty electrode Clean electrode
6.2
6.1