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O
P
P
PERATING
ROCEDURES AND
RECAUTIONS
IMPORTANT
Intended Use
The 5905/5010 probe is intended for laboratory use, not field
use. It is not waterproof and should never be immersed past
the taper on the stem of the probe.
Air Calibration
When calibrating in air, make sure there are no water droplets
on the membrane. Water droplets will cause a low calibration
reading. Excess water may be removed by shaking the probe
downward. If droplets persist it may be necessary to carefully
remove them using a clean cloth or paper towel.
Checking the Probe Zero
The probe zero is checked by immersing the probe in a sodium
sulfite solution (0.08M or 3g Na
SO
/300mL), or in water
2
3
which has an inert gas bubbling through it (e.g. nitrogen,
argon). The meter should read less than 1% dissolved oxygen
in either of these environments. If it does not, change the
membrane or clean the probe.
Membrane Life
Membrane life depends on use. Membranes will last longer if
installed properly and treated with care during use. Erratic
readings will result from loose, wrinkled, or fouled
membranes, or from bubbles larger than 1/8" in the electrolyte
solution. If erratic readings or other evidence of membrane
damage occurs, replace the membrane and KCl solution. The
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