Electrode Maintenance; Meter Maintenance - Mettler Toledo FiveGo DO meter FG4 Bedienungsanleitung

Maintenance
5 Maintenance

5.1 Meter maintenance

Never unscrew the two halves of the housing!
The meters do not require any maintenance other than an occasional wipe with a damp cloth and the
replace ment of dead batteries. The housing is made of acrylonitrile butadiene styrene/polycarbonate
(ABS/PC). This material is sensitive to some organic solvents, such as toluene, xylene and methyl ethyl
ketone (MEK).
Any spillage should be wiped off immediately.

5.2 Electrode maintenance

The DO sensor measures the oxygen content galvanically: It produces a mV­output proportional to the
oxy gen concentration present in the medium. Oxygen diffuses through the membrane and is being con-
sumed at the cathode, producing an electrical current. Although the amount of oxygen consumed is low,
a new sample should still flow past the membrane to prevent false readings.
For maximum lifetime and maximum accuracy, the sensor should be handled with the proper care. After
use, rinse the sensor with clean deionized water and wipe it with a soft tissue. When storing the sensor
for a longer period, make sure it is placed in the wetting cap supplied in the standard delivery. Also, de-
posits on the membrane should be removed with a tissue, because they hamper the diffusion of oxy gen
through the membrane.
Note
The filling solution in the electrode cap is 10% NaCl (Sodium Chloride). Cleaning and filling solutions
should be handled with the same care as that given to toxic or corrosive substances.
5.3 Disposal
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In compliance with European Directive 2002/96/EC on Waste Electrical and Elec-
tron ic Equipment (WEEE), this device must not be disposed of together with
domes tic waste. This also applies to countries outside the EU, per their specific
require ments.
Please dispose of this product in accordance with local regulations at the col lect-
ing point specified for electrical and electronic equipment.
If you have any questions, please contact the responsible authority or the dis trib u-
tor from which you purchased this device.
Should this device be passed on to other parties (for private or professional use),
the content of this regulation must also be related.
Thank you for your contribution to environmental protection.
DO meter FG4