Maintenance; Meter Maintenance; Electrode Maintenance - Mettler Toledo SevenGo pro SG8 Bedienungsanleitung

Error messages / Maintenace
Slope out of range!
Wrong buffer!
T differs from setting!
Temp. out of range!
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.
20
Meter cannot recognize the
buffer or standard
ATC measured temperature
differs by more than 0.5 °C
from the user-defined value
ATC measured temperature
is out of pH calibration
buffer range: 5 ºC...50 ºC
Make sure you have the correct buffer and that it
is fresh.
Clean or replace the electrode.
Make sure you have the correct buffer and that it
is fresh.
Make sure that the buffer has not been used more
than once during the calibration.
Keep the buffer or sample at the set temperature
or change the temperature setting.
Keep the buffer temperature within the range.
METTLER TOLEDO SevenGo pro™ pH