Hach ORBISPHERE 3654 Basic User Manual page 26

Take a few membranes out of the storage box.
Using tweezers included in the kit, pick up one membrane from the stack, and gently
place it on the sensor tip.
Make sure it is centered.
Note: Distinguish the membrane from the protection paper:
• Membrane is transparent (translucent)
• Protection paper is opaque
The membrane diameter is larger than the sensor head diameter. This is normal, as the
membrane will fold over the sensor tip.
Place the membrane holding ring on the installation tool tip.
To avoid damaging the membrane, make sure that the tool tip is totally clean and its
surface is even.
Insert the installation tool inside the guiding sleeve.
Push the installation tool firmly downwards. This clasps the mounting ring onto the
sensor head, folding the membrane over the sensor tip.
Remove the installation tool and guiding sleeve.
Visually check for correct ring placement, try to push it down with your fingers.
Check that the membrane is tight, with no wrinkles.
Note: Once installed, a membrane cannot be reused. Avoid touching membranes with bare fingers, as
this may affect its sensitivity.
Clean and dry the protection cap ready for installation.
Replace the O-ring inside the protection cap with a new one. Tighten the protection cap
finger tight.
Then, complete the process using the tool provided in the maintenance kit. Insert into
each of the four holes in turn, and tighten as far as possible. Tighten each hole only
once.
Finally replace the flow chamber, by gently lowering it onto the sensor and guiding the thermistor and
purge gas duct on the sensor into the two holes in the flow chamber base. Turn the flow chamber
locking nut clockwise to secure it in place.
Check that the membrane has not been damaged. The alarm message "ERR" will be displayed on
your analyzer if the membrane leaks in any way.
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