Hach NO3D sc, Руководство пользователя

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Section 5 Maintenance
Important Note: Only qualified personnel should conduct the tasks
described in this section of the manual.
5.2 Clean the sensor
Important Note:
Do not touch the membranes with fingers.
Do not clean the sensor cartridge with sharp objects that may
cause scratches and do not use any chemical cleaning agent.
1. Clean the sensor cartridge with the soft brush supplied.
2. Clean the sensor body (not the cartridge) with a sponge or
brush.
3. Rinse the sensor with clean, lukewarm tap water.
5.2.1 Polish the chloride electrode
Polish the chloride electrode if it shows signs of being heavily
coated/contaminated. If the electrode slope sinks below
40 mV/Dec. following a 2-point matrix calibration, clean the chloride
electrode with the polishing paper supplied. To do this, lightly
moisten the polishing paper and then carefully and evenly polish
the coating away.
Important Note: Only the LZY671 polishing paper supplied may be
used!
5.1 Maintenance schedule
Maintenance task 30 days
1
6 months
Clean sensor
2
x
Replace the sensor cartridge
3, 4
x
Check sensor for damage x
Check measured value by lab reference analysis and correct values by matrix
correction if required
3
x
1
Recommendation: weekly during the first month in operation
2
The frequency of cleaning depends on the application. In some applications more or less frequent cleaning may be necessary.
3
In typical operating conditions, a different interval may be required depending on the specific application and local conditions.
4
Sensor cartridges are wear parts and are not covered by the instrument warranty.
Important Note: Do not check the sensor with usual NO
3
–N standard solutions, because the ion strength of
normal standard solutions are not strong enough. Use therefore calibration solutions with artificial ion matrix
generate to have plausible measurements.