Xylem 6-Series Multiparameter - Manual (Page 124)

Sondes Section 2
YSI Incorporated Environmental Monitoring Systems Operations Manual 2-118
2. Rinse the probe in clean tap water, wipe with a cotton swab saturated with clean water, and then
rerinse with clean tap water. To be certain that all traces of the acid are removed from the probe
crevices, soak the probe in pH 4 or 7 buffer for about an hour with occasional stirring.
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 tap water and then soak for at least 1 hour in pH 4 or 7 buffer with
occasional stirring to remove residual bleach from the junction. (If possible, soak the probe for period
of time longer than 1 hour in order to be certain that all traces of chlorine bleach are removed.) Then
rerinse the probe with clean tap water and retest.
Dry the sonde port and probe connector with compressed air and apply a very thin coat of O-ring lubricant
to all O-rings before re-installation. Keep pH probes moist when not in use but NEVER store in DI water.
DEPTH SENSOR
The depth sensor modules are factory installed options that are located between the bulkhead and the sonde
tube. For 600XL and 600XLM sondes, there is a circular protective cap with two small holes. The cap
cannot be removed, but a syringe is supplied in the maintenance kit to aid in cleaning the pressure port. Fill
the syringe with clean water, place the tip of the syringe into one of the holes and gently force water
through the pressure port. Ensure that the water comes out of the other hole. Continue flushing the
pressure port until the water comes out clean.
CAUTION
: Never try to remove the circular pressure port cap.
For 6920V2-1, 6920V2-2, 6600V2-2, 6820V2-1and 6600V2-2 sondes, the depth sensor is exposed to the
water by either a circular access port on the side of the sonde or a though-hole on a module just above the
sonde bulkhead. A syringe is supplied in the maintenance kit to aid cleaning the pressure port. Fill the
syringe with clean water, place the tip of the syringe into one of the holes and gently force water through
the access port. Ensure that the water comes out of the other hole. Continue flushing the pressure port
until the water comes out clean.
CAUTION
: Do not attempt to remove the depth module from the sonde body.
LEVEL SENSOR
For level sensors follow all the maintenance procedures given for depth sensors. In addition, ensure that
the desiccant always remains active. Active desiccant is a distinctive blue color. When it can absorb no
more moisture, it is a rose red or pink color. For either the cartridge or the canister, the end that is vented
to atmosphere will begin to change color first. As long as the desiccant closest to the sonde is blue, no
maintenance is required. Local conditions will dictate how long the desiccant will last. In humid
environments, the desiccant may need to be changed or regenerated well before it is completely exhausted
to ensure that it lasts the entire deployment.
You may regenerate the desiccant, replace the desiccant in the cartridge or canister, or replace the entire
cartridge or canister. See Appendix G, Using Vented Level, for more information.
To regenerate the desiccant, remove it from the unit and spread it evenly, one granule deep, on a suitable
tray. Heat for about one hour at about 200° C (about 400° F). The desiccant should then be cooled in a
suitable, tight container before refilling the unit. The color of the desiccant will return to blue if the