Hach ORBISPHERE 31290TC Manuel D'utilisation Simplifié page 14

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.
7. Prepare the protection cap for installation. All parts must be absolutely dry and clean. Replace all
the parts inside the protection cap with new ones (except the grille), and place them in the order
they were removed. The Tefzel washers, under the cap, should be slightly lubricated with silicone
grease.
Note: The illustration is an example only. Your configuration may differ.
8. 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.
Note: The grille inside the protection cap should be free to move during tightening. Therefore, and to avoid
damage to the membrane, do not touch the grille during the tightening process.
9. Always store the sensor in a dry environment, with the storage cap installed.
Note: A sensor that has been taken apart, or serviced must always be calibrated. Allow the sensor to settle for
30 minutes to allow measurements to stabilize and the membrane(s) to relax, before performing the sensor
calibration.
Calibrate the sensor to check that the membrane has been installed correctly and not been
damaged. If an error message appears on your instrument, then the membrane has been damaged
or incorrectly installed.
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