Lutron Electronics WA-2017SD Operation Manual page 31

9-3. Probe maintenance
User first time to use the meter
Intend to let the DO probe keep the best
condition, when user receive the Oxygen Probe,
it should fill the Probe's Electrolyte at first.
User already use the probe for a certain
period :
Whenever user can not calibrate the meter
properly or the meter's reading value is not stable,
please check the oxygen probe to see if the
electrolyte in the probe head container is run out
or the diaphragm ( probe head with diaphragm
set) exist problem ( dirty ). If yes, please fill the
electrolyte or change the " Probe head with
diaphragm set " and make the new calibration.
The consideration of Diaphragm ( probe
head with diaphragm set
The oxygen probe component is the thin Teflon
diaphragm housed in the tip of the probe. The
diaphragm is permeable by the oxygen molecules but
not by the considerably larger molecules contained in
the electrolyte. Due to this characteristic, the oxygen
may diffuse throughout the electrolyte solution
contained in the probe, and its concentration may be
quantified by the measurement circuit.
29