YSI 600LS - User Manual - Manual (Page 120)

Sondes Section 2
YSI Incorporated Environmental Monitoring Systems Operations Manual 2-114
To resurface the probe using the fine sanding disk, follow the
instructions below.
First dry the probe tip completely with lens cleaning tissue. Next,
hold the probe in a vertical position, place one of the sanding
disks under your thumb, and stroke the probe face in a direction
parallel to the gold electrode (located between the two silver
electrodes). The motion is similar to that used in striking a
match. Usually 10-15 strokes of the sanding disk are sufficient
to remove black deposits on the silver electrodes. However, in
extreme cases, more sanding may be required to regenerate the
original silver surface.
After completing the sanding procedure, repeatedly rinse the probe face with clean water and wipe with
lens cleaning tissue to remove any grit left by the sanding disk. After cleaning, thoroughly rinse the entire
tip of the probe with distilled or deionized water and install a new membrane.
IMPORTANT: Be sure to: (1) Use only the fine sanding disks provided in the 6035 maintenance kit in the
resurfacing operation and (2) Sand in a direction parallel to the gold electrode. Not adhering to either of
these instructions can seriously damage the electrodes.
NOTE: If this procedure is unsuccessful, as indicated by improper probe performance, it may be necessary
to return the probe to an authorized service center. See Section 9, Warranty and Service Information,
for contact information.
6150 ROX OPTICAL DO PROBES
CAUTION: The sensor membrane of the 6150 probe should be cleaned ONLY with a lens tissue
which has been moistened with WATER. ALCOHOL should NOT be used in the cleaning process
as it will dissolve the outer paint layer of the membrane assembly; other organic solvents will likely
dissolve the dye itself. Under NO circumstances should you use organic solvents to clean your sensor
membrane
When the 6150 sensor is not in field use, it MUST BE STORED IN A MOIST ENVIRONMENT, i.e.,
either in water or in water-saturated air with storage in water being preferable. If the sensor membrane is
allowed to dry out by exposure to ambient air, it is likely to drift slightly at the beginning of your next
deployment unless it is rehydrated. Thus, to make the use of the sensor as simple as possible, remember to
store it WET whenever possible. The easiest storage method is to use the protective plastic cap (and
enclosed sponge) which was on the probe at receipt. If you have retained this cap/sponge, then simply
soak the sponge in water and replace the cap on the probe tip. Inspect the sponge every 30 days to make
sure it is still moist. Alternatively, you can remove the probe from the sonde and place it directly in water
(making sure that the water does not evaporate over time or leave the probe in the sonde and make certain
that the calibration cup has an atmosphere which is water-saturated by placing approximately ½ inch of
water in the bottom of the cup and then sealing it snugly to the sonde.
If you inadvertently leave your sensor exposed to ambient air for a period of more than approximately 2
hours, you can rehydrate the membrane by the following method: (1) Place approximately 400 mL of water
in a 600 mL beaker or other similar glass vessel – do NOT use plastic vessels – and heat the water on a
thermostatted hotplate or in an oven so that a consistent temperature of 50+/- 5 C is realized. Place the
probe tip containing the sensor membrane in the warm water and maintain the elevated temperature for
approximately 24 hours. Cover the vessel if possible to minimize evaporation. After rehydration is
complete, store the probe in either water or water-saturated air at room temperature prior to calibration and
deployment. CAUTION: MAKE CERTAIN THAT THE WATER IN THE VESSEL DOES NOT
COMPLETELY EVAPORATE DURING THE REHYDRATION STEP.