YSI 6 series User Manual page 123

Sondes
Store the probe with new membrane in either water or water-saturated air as described on

the previous page.
6560 CONDUCTIVITY/TEMPERATURE PROBES
The openings that allow fluid access to the conductivity electrodes must be cleaned regularly. The small
cleaning brush included in the 6570 Maintenance Kit is ideal for this purpose. Dip the brush in clean water
and insert it into each hole 15-20 times. In the event that deposits have formed on the electrodes, it may be
necessary to use a mild detergent with the brush. After cleaning, check the response and accuracy of the
conductivity cell with a calibration standard.
NOTE: If this procedure is unsuccessful, or if probe performance is impaired, it may be necessary to
return the probe to an authorized dealer service center See Section 9, Warranty and Service Information
for contact information.
The temperature portion of the probe requires no maintenance.
6561/6561FG pH AND 6565/6565FG/6566 COMBINATION pH-ORP PROBES
Cleaning is required whenever deposits or contaminants appear on the glass and/or platinum surfaces of
these probes or when the response of the probe becomes slow.
Remove the probe from the sonde. Initially, simply use clean tap water and a soft clean cloth, lens
cleaning tissue, or cotton swab to remove all foreign material from the glass bulb (6561 and 6565) and
platinum button (6561). Then use a moistened cotton swab to carefully remove any material that may be
blocking the reference electrode junction of the sensor.
CAUTION: When using a cotton swab with the 6561 or 6565, be careful NOT to wedge the swab tip
between the guard and the glass sensor. If necessary, remove cotton from the swab tip, so that the cotton
can reach all parts of the sensor tip without stress. You can also use a pipe cleaner for this operation if
more convenient. DO NOT use toothbrush, steel wool, or abrasive cleaners on any glass sensor.
If good pH and/or ORP response is not restored by the above procedure, perform the following additional
procedure:
1. Soak the probe for 10-15 minutes in clean tap water containing a few drops of commercial
dishwashing liquid, or enzyme-containing detergent such as Terg-A-Zyme (by Alconox).
2. GENTLY clean the glass bulb and platinum button by rubbing with a cotton swab soaked in the
cleaning solution.
3. Rinse the probe in clean tap water, wipe with a cotton swab saturated with clean water, and then
rerinse with clean tap water.
If good pH and/or ORP response is still not restored by the above procedure, perform the following
additional procedure:
1. Soak the probe for 30-60 minutes in one molar (1 M) hydrochloric acid (HCl). This reagent can be
purchased from most distributors. Be sure to follow the safety instructions included with the acid.
YSI Incorporated Environmental Monitoring Systems Operations Manual
Section 2
2-117