Hach-Lange ORBISPHERE 31xxx Thermal Basic User Manual - Manual (Page 13)

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.
2. 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.
3. To mount a single membrane:
• 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.
To mount dual membranes:
• Remove one 29562A secondary membrane along with one piece of the separation paper from
its box. Place the membrane and paper, paper side down, on a clean flat surface.
• Remove a primary membrane along with its separation paper.
• With the separation paper on top of the primary membrane place the primary membrane
directly over the secondary membrane, taking care to center the two membranes.
• Rub your finger on the paper of the primary membrane to remove any air bubbles between the
membranes. The two membranes should now be sandwiched together and appear as one
membrane.
• Pickup the sandwiched membranes with tweezers and remove the separation paper.
• Gently place them on the sensor tip ensuring the secondary membrane (29562A) is on the
bottom.
• Make sure they are centered. The membrane diameter is larger than sensor head diameter.
This is normal, as the membrane will fold over the sensor tip.
Note: Distinguish the membrane from the protection paper:
• The membrane is transparent (translucent).
• The protection paper is opaque.
4. 5. 6. 7.
4. The membrane holding ring comes in two slightly different internal diameters, depending on the
membrane(s) total thickness (A = 29228 holding ring, membrane thickness < 50μ; B =
29229 holding ring, membrane(s) total thickness ≥ 50μ ). For a correct membrane installation, be
sure to use the correct holding ring for the application. If mounting dual membranes, always use
mounting ring part number 29229.
5. Place the membrane holding ring on the installation tool tip.
C A U T I O N
To avoid damaging the membrane, make sure that the tool tip is totally clean and its surface is even.
6. Insert the installation tool inside the guiding sleeve.
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