YSI ADV6600 - Manual (Page 16)

Section 2. Preparation of the Sonde
ADV6600
Y S I
Environmental
Page 6
• Hold the probe in a vertical position and apply a
few drops of electrolyte solution to the tip. The
fluid should completely fill the small moat
around the electrodes and form a meniscus on
the tip of the sensor. Be sure no air bubbles are
visible. If necessary, shake off the electrolyte
and start over.
• Secure a membrane between your thumb and the
probe body. Always handle the membrane
with care, touching it only at the ends.
• With the thumb and forefinger of the opposite
hand, grasp the free end of the membrane. With
one continuous motion, gently stretch it up, over,
and down the other side of the sensor. Do not
hesitate to stretch the membrane until it
conforms to the face of the sensor. Secure the
membrane with the forefinger of the hand
holding the probe body.
• Roll the o-ring over the end of the probe, being
careful not to touch the membrane surface with
your fingers. There should be no wrinkles or air
bubbles. If any are present, remove the
membrane and repeat the installation procedure
with a new membrane. Squeeze the o-ring every
90 degrees to equalize the tension. Do not use
grease or lubricant of any kind on the o-ring.
• Trim off any excess membrane with a sharp knife, a scalpel, or scissors. Make the cut about
1/8-inch below the o-ring. Rinse off any excess KCl solution, but be careful not to get any
water in the connector.
Note: You may find it more convenient to mount the probe vertically in a vise with rubber jaws
while applying the electrolyte and membranes to the sensor tip.
2-1.3. Membrane Installation with the DO Probe Installed in the
Sonde
• Secure the sonde in a vertical position using a vise, or a clamp with rubber jaws and ring stand.
Secure it tightly so that it will not move during membrane installation. Position the sonde with
the sensors upright. Remove the calibration cup or probe guard from the sonde.