Performing The Measurement; Probe Do 7 Maintenance; Electrolyte Replacement; Maintenance Of The Anode And The Cathode - XS Instruments Revio Manual De Instrucciones

Dissolved O concentration expressed in mg/l, corresponding to ppm
•
2
Dissolved O
Measure range
Risolution
• During the measurement press the button

• Performing the measurement

Remove the protective cap of electrode, rinse it with distilled water; dab it with paper towel and dip in the
solution to analyse. Gently stir and wait until the value stability, when the icon
take the reading.
Note: the polarographic sensor tends to consume the oxygen, and thus reducing gradually the
detected value. Make sure that there is a minimum flow in the sample to analyse; if you are working
in a laboratory, keep the sample stirred.

Probe DO 7 maintenance

If the instrument does not calibrate or the reading does not stabilize, it is necessary to perform a
maintenance of the probe. In order to perform the maintenance, follow these steps in order:
Replacement of electrolyte.
•
• Cleaning of anode and cathode.
Replacement of membrane.
•
If you want to buy some spare parts, contact your local distributor.

• Electrolyte replacement

• Unscrew the membrane cap from the sensor, check that it is not punctured or damaged; if it is intact,
it can be used again, otherwise it must be replaced.
• Carefully wash the membrane and the sensitive part of the sensor with distilled water; remove any
salt residue and dry with paper towel.
Be very careful when handling the sensor and the membrane. Falls, shocks or crushing can damage
the sensor and/or membrane.
Fill the membrane cap with distilled water at half level and screw it on the sensor (pay attention in the
•
fixing phase, since the membrane does not have to be screwed strongly up to end run, because it can
be damaged). Stir gently, unscrew the membrane again and empty it completely; in this way, any
traces of water or dust will be eliminated.
Refill the membrane with new electrolyte; this time, fill it completely and screw the sensor making
•
sure that no air bubbles appear inside. A light leakage of electrolyte during the screwing of membrane,
ensures that no air bubble will be created.
Wash the probe and leave it in distilled water for at least half an hour, in order to rehydrate the
•
membrane.
Perform the Calibration of the sensor. If it does not work, proceed with the Maintenance of the anode and
the cathode.

• Maintenance of the anode and the cathode

The sensitive part of the probe is composed by an anode and a cathode; the two elements are composed
by precious metals. Over time, these metals can be passivated by decreasing the efficiency of the probe, up
to the point that the probe does not calibrate. In this case, remove the membrane and the passivation with
very fine abrasive paper, gently scratching the metal parts; wash everything with distilled water and proceed
with the Replacement of Electrolyte. Perform the Calibration of the sensor. If it does not work, proceed
with the Replacement of the membrane.
UM ReVio EN rev.0 04.06.2020
2
39
0,00...50,00 mg/l - ppm
0,01 mg/l
, in order to change the unit of measurement.
appears on the display,
EN