Hach-lange ORBISPHERE 31xxx Installation and Maintenance Manuel d'utilisateur télécharger pdf (Page 29)

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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.

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