YSI APPENDIX F - Manual (Page 8)

Quick Start Guide to Drinking Water Studies Appendix F
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.
The pictures below show a properly installed free chlorine membrane. Note that, because the membrane
will not stretch, there may be some points where the membrane is slightly “bunched up” in the o-ring
groove. This effect is normal and will not affect sensor function. Also note that the presence of bubbles
under the membrane is also normal and should not affect probe function
YSI Incorporated Drinking Water Monitoring Systems Operations Manual F-8