YSI 556 MPS - Manual (Page 100)

Section 11 Maintenance
YSI 556 MPS YSI Incorporated Page 94
NOTE: The YSI 5563 DO sensor is shipped dry. A shipping
membrane was installed to protect the electrode. A new
membrane cap must be installed before the first use. Refer to
Section 3.4.1 Sensor Installation.
11.1.3 YSI 5564 pH and 5565 Combination pH/ORP Sensor Cleaning
Cleaning is required whenever deposits or contaminants appear on
the glass and/or platinum surfaces of these sensors or when the
response of the sensor becomes slow.
1. Remove the sensor from the probe module.
2. Initially, simply use clean water and a soft clean cloth, lens
cleaning tissue, or cotton swab to remove all foreign material
from the glass bulb (YSI 5564 and YSI 5565) and platinum
button (YSI 5565). 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 YSI 5564 or
YSI 5565, 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.
NOTE: If good pH and/or ORP response is not restored by the
above procedure, perform the following additional procedure:
1. Soak the sensor for 10-15 minutes in clean water containing a
few drops of commercial dishwashing liquid.
2. GENTLY clean the glass bulb and platinum button by rubbing
with a cotton swab soaked in the cleaning solution.
3. Rinse the sensor in clean water, wipe with a cotton swab
saturated with clean water, and then re-rinse with clean water.
NOTE: If good pH and/or ORP response is still not restored
by the above procedure, perform the following additional
procedure: