YSI 5239 Dissolved Oxygen Probe - Manual (Page 10)

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I NTERFERENCES
Hydrogen sulfide, sulfur dioxide, halogens, carbon monoxide,
chlorine, nitric oxide, and nitrous oxide can cause the probe to
give erroneous readings. If you suspect erroneous readings, it
may be necessary to determine if these are the cause.
A CIDS
Avoid any environment that contains substances such as
concentrated acids, caustics, and strong solvents that may
attack the probe. Probe materials that may be damaged by
these substances include FEP Teflon, EPR rubber, ABS
plastic, and stainless steel.
S TORAGE
When the probe is not in use, store the probe in a humid
environment, such as the plastic calibration bottle (with a wet
sponge or paper towel inside) or a BOD bottle containing at
least 1 inch of water (remove probe guard first).