Hach ORBISPHERE 3658 Basic User Manual page 22

The membrane mounting surface must be clean and even (on top of the sensor,
where the membrane and sensor have contact).
Replace the membrane O-ring on the sensor head with a new one.
Note: The 29039.0 Nitril O-ring can be reused if it is still in good condition. Membrane O-rings are part
of the protection cap kit.
In the maintenance kit, pick up the two part membrane mounting tool.
Install the sleeve over the sensor head (end with shoulder downwards).
Note: Once installed, a membrane cannot be reused. Avoid touching the membrane with bare fingers,
as this may affect its sensitivity.
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.
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