Delta OHM HD2109.1, Руководство по эксплуатации

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HD2109
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V2.4
5. Screw the probe's head back on carefully.
Check the probe's status
The glass body covering the cathode of the polarographic probe and the membrane on the probe's
head should not be damaged.
If there are cracks in the glass body, the probe must be replaced. If the oxygen-permeable mem-
brane is damaged, dirty or obstructed it must be replaced. When the probe's head is unscrewed the
probe is not protected. Handle it with care to avoid collisions that could damage it irreparably.
Control the zero of the probe
Compensation of the zero (offset) of the probe is already done in the factory.
The user can control the offset by immersing the probe in the 0.0% dissolved oxygen solution (DO
9700):
•
pour a small quantity of 0.0% dissolved oxygen solution into a container, after suitably
cleaning the container with distilled water,
•
insert the probe in the zero solution and wait at least 5 minutes,
•
the instrument should indicate a saturation index < 0.6%.
Dissolved oxygen probe storage
When the dissolved oxygen probe is not used it should be disconnected from the instrument to
avoid useless consumption of the electrolyte solution and the discharge of the batteries.
When no measurement is taken for long periods, withdraw the internal electrolyte of the galvanic
probe, to avoid useless consumption of the measurement electrodes.
Always keep the electrode wet using the special cap provided with the probe and filled with dis-
tilled water.