YSI 6 series User Manual page 13

Sondes
DO MEMBRANE INSTALLATION WITH THE PROBE INSTALLED IN THE SONDE
Secure the sonde in a vertical position using a vise or a clamp and ring stand such that the sensors are
upright. Remove the probe guard from the sonde.
Remove the old DO membrane and clean the probe tip with water and lens cleaning tissue. Make sure to
remove any debris or deposits from the O-ring groove.
Using the dropper bottle of electrolyte supplied, place electrolyte on the DO probe tip until a high meniscus
is formed as shown in Figure 8 below.
Figure 8
Hold the membrane so that all four corners are supported, but do not stretch the membrane laterally.
Position the membrane over the probe, keeping it parallel to the probe face as shown in Figure 9 above.
Using one continuous downward motion, stretch the membrane over the probe face as shown. See Figure
10 below. Do not hesitate to stretch the membrane.
Figure 10
Install a new O-ring by placing one side of the O-ring in the groove and rolling into place across the
membrane and into the groove on the opposite side of the probe face. Avoid touching the probe face with
YSI Incorporated Environmental Monitoring Systems Operations Manual
Figure 9
Figure 11
Section 2
2-7