Installing The Membrane - Hach ORBISPHERE 31 Serie Manual Básico Del Usuario

6.3.2 Installing the membrane

1.
1. The membrane mounting surface must be clean and even. 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.
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. 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:
• The membrane is transparent (translucent).
• The protection paper is opaque.
4.
4. 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.
5. Insert the installation tool inside the guiding sleeve.
6. Push the installation tool firmly downwards. This clasps the mounting ring onto the sensor head,
folding the membrane(s) 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.
2.
5.
C A U T I O N
3.
6.
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