YSI 600DW-B Sonde - Manual (Page 15)

Sondes Section 2
As shown in the picture below, place the bottom of the o-ring installation tool over membrane/probe face
and press down securely.
As shown in the picture below left, roll the o-ring off of the end of the installation tool so that it resides in
the o-ring groove of the probe. Be sure to hold onto the O-ring prior to removing the installation tool so
that it does not pop out of the groove. Then, as shown below right, remove the installation tool and make
certain that the o-ring is centered in the groove on probe end.
As shown in the picture below, use a razor blade or knife to trim away the excess membrane material.
YSI Incorporated Drinking Water Monitoring Systems Operations Manual 2-8