YSI ADV6600 - Manual (Page 142)

Section 10. Care, Maintenance, and Storage
ADV6600
Y S I
Environmental
Page 132
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.
2. Rinse the probe in clean water, wipe with a cotton swab saturated with clean water, and rinse
again with clean water.
3. Soak the probe in clean water for about an hour with occasional stirring until all traces of the
acid are removed from the probe crevices.
4. Re-install the sensor and re-calibrate.
If biological contamination of the reference junction is suspected or if good response is not restored
by the above procedures, perform the following additional cleaning step:
1. Soak the probe for approximately 1 hour in a 1 to 1 dilution of commercially available chlorine
bleach.
2. Rinse the probe with clean water
3. Soak the probe for at least 1 hour in clean water with occasional stirring to remove residual
bleach from the junction. If possible, soak the probe in clean water for a period of time longer
than 1 hour in order to be certain all traces of chlorine bleach are removed.
4. Rinse the probe with clean water.
5. Re-install the sensor and recalibrate.
10-3.5. ISE Probes
The Chloride, Ammonium, and Nitrate probes should be cleaned whenever deposits or contaminants
appear on the ion selective membranes located on the tips of the sensor modules. If possible, the
module should be cleaned while installed in the sonde bulkhead. Use clean water and a moist piece
of lens cleaning tissue to gently wipe the sensor membranes until no more contaminants are present.
NOTE: The ion selective membranes are fragile. To avoid serious damage to the sensor, be
certain to: (1) Use only moist, high quality lens cleaning tissue for the cleaning procedure (not
paper towels or other coarse materials); and (2) Stroke the probe face very gently with the tissue
during the procedure.
10-3.6. Optical Probes
The optical probes require only minimal maintenance. After each deployment, the optical surface
on the tip of the turbidity probe should be inspected for fouling and cleaned if necessary by gently
wiping the probe face with moist lens cleaning paper. In addition, it is recommended to replace the
wiper and/or wiper pad periodically. The frequency of this replacement depends on the quality of