WPI STX2-PLUS, Инструкция по эксплуатации

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6 World Precision Instruments
CAUTION : Ammonia is NOT recommended, because silver chloride dissolves
in ammonia.
Sterilizing the STX2-PLUS Electrode
The STX2-PLUS electrodes are non-sterile as supplied. Acceptable low temperature steril-
ization methods for the electrodes include gamma irradiation and ethylene oxide gas (ETO).
CAUTION
: Do NOT autoclave the electrode.
CAUTION : Do NOT use ionized hydrogen peroxide (H
2
O
2
).
CAUTION : Do NOT expose the electrodes to ultra-violet light, because UV light
decomposes silver/silver chloride electrodes.
CAUTION : Do not sand or abrade the electrode surfaces. A damaged
electrode will expose tissues to copper. An electrode showing deep scrateches
on the Ag-AgCl surfaces must be replaced.
CAUTION : Do not immerse the electrode head.
Rechloriding the Electrodes
The STX2-Plus electrode must be dipped into chlorine bleach (5% sodium
hypochlorite) on occasion to maintain the amount of Ag to AgCl balance. Otherwise,
the electrode will become unstable. A 10–15 minute immersion of the tips is
recommended before each daily use. (These treatments may be reduced to once
per week as experience guides). DMEM deposits cause resistance measurements to
become unstable and the coating appears as a dark crust on the electrode surfaces.
See “Appendix A: KCL testing mixtures” on page 9. A properly chlorided silver
surface will appear to be a dark silvery grey coloration.
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CAUTION : Too much chloriding can also lead to instabilities. A short 5 minute
soak in ammonia water (3%) will convert the AgCl back to Ag. After a DI water
rinse, repeat the chloriding. Follow this with an electrode test.
Storing the Electrodes
After a daily use, wash and store the electrodes dry.