Hach-Lange ORBISPHERE 31xxx Installation and Maintenance - Manual (Page 29)

27
Maintenance
For the correct electrolyte selection, please refer to the table
in
Sensor parts on page 37 .
Using the syringe or bottle nozzle included in the maintenance
kit, fill up the sensor cavity with electrolyte.
Note: Be careful not to touch the electrodes with the needle, as a
scratch on the surface may lead to loss of performance.
Tilt the sensor slightly and inject into the lower hole, pushing
bubbles out at the upper hole. Gently tap on the sensor side
to move trapped bubbles.
Return the sensor to the vertical position. The last drop of
electrolyte should form a cupola on top of the sensor tip.
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 of
the stack, and gently place it on the sensor tip.
Make sure it is centered, and no bubble is trapped.
If a sensor mask is used, place it directly on top of the
membrane.
For correct membrane selection, please refer to the tables in
Sensor membrane specifications on page 10 .
Note: Distinguish the membrane from the protection paper:
- The membrane is transparent (translucent).
- The protection paper is opaque.
The membrane diameter is larger than sensor head diameter.
This is normal, as the membrane will fold over the sensor tip.
The membrane holding ring comes in two slightly different
internal diameters, depending on the membrane(s) total
thickness.
For a correct membrane installation, be sure to use the
correct holding ring for the application.