Maintenance; Meter Maintenance; Electrode Maintenance; Disposal - Mettler Toledo SevenGo SG2 Bedienungsanleitung

5.

Maintenance

5.1

Meter maintenance

Never unscrew the two halves of the housing.
The SevenGo™ series instruments do not require any maintenance other than an occasional wipe with a
damp cloth and the replacement of dead batteries.
The housing is made of acrylonitrile butadiene styrene/polycarbonate (ABS/PC). This material is attacked
by some organic solvents, such as toluene, xylene and methyl ethyl ketone (MEK). Any spillage should be
immediately wiped off.
5.2

Electrode maintenance

Make sure the electrode is always stored in an appropriate storage solution.
For maximum accuracy, any filling solution that may have "crept" and encrusted the outside of the electrode
should be removed with deionized water.
Always store the electrode according to the manufacturer's instructions and do not allow it to dry out.
If the electrode slope falls rapidly, or if the response becomes sluggish, the following procedures may help.
Try one of the following, depending on your sample.
1. For fat or oil build-up, degrease the membrane with cotton wool soaked in either acetone or a soap
solution.
2. If the sensor membrane has dried out, soak the tip of the electrode in 0.1 M HCl overnight.
3. If protein build-up has occurred in the diaphragm, remove deposits by soaking the electrode in an
HCl/pepsin solution (51340068).
4. If silver sulfide contamination has occurred, remove the deposits by soaking the electrode in a solution
of thiourea (51340070).
After treatment a new calibration should be performed.
Note
Cleaning and filling solutions should be handled with the same care as that given to toxic or corrosive
substances.
5.3

Disposal

In conformance with the European Directive 2002/96/ EC on Waste Electrical and Electronic
Equipment (WEEE) this device may not be disposed of in domestic waste. This also applies to
countries outside the EU, per their specific requirements.
Please dispose of this product in accordance with local regulations at the collecting point specified
for electrical and electronic equipment.
If you have any questions, please contact the responsible authority or the distributor 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.
METTLER TOLEDO SevenGo™ pH
51710340 Buch.indb 15
Maintenance
15
28.2.2006 15:40:27 Uhr