Hach ORBISPHERE 31 Serie Manual Básico Del Usuario página 14

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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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