Meter Maintenance; Ph Electrode Maintenance; Inlab® Optiox Sensor Maintenance; Maintenance 29 - Mettler Toledo SevenGo pro Instrucciones De Montaje

8 Maintenance

8.1 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. 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.

8.2 pH electrode maintenance

Make sure the pH electrode is always kept filled with the appropriate filling 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.
Problem
Fat or oil build-up
pH sensor membrane has dried out
Protein build-up in the diaphragm of a pH sensor
Silver sulfide contamination of pH sensor
Note
Cleaning and filling solutions should be handled with the same care as that given to toxic or corrosive
substances.
8.3 InLab® OptiOx sensor maintenance
Storage
1 Do not remove the sensor cap.
2 The sensor can be stored dry. It is recommended to keep it in the white calibration tube to protect the
sensor cap from mechanical damage.
3 Keep the sensor away from direct sunlight during storage.
Cleaning the sensor cap and body
1 Do not remove the sensor cap.
2 Rinse the sensor with distilled water.
3 Gently wipe with a soft-bristled brush or soft cloth if biofouling is present.
4 If extensive mineral build-up is present, soak the cap end in vinegar for 15 minutes.
5 Soak the sensor in deionized water for 15 minutes and blot it dry with a lint-free tissue.
6 After cleaning the sensor, 1-point calibration should be performed to check it.
Note
Do not use organic solvents or soaps to clean the cap!
Cleaning of the inner lens should only be performed when changing the cap.
SevenGo (Duo) pro™/OptiOx™
Action
Degrease the membrane with cotton wool soaked in
either acetone or a soap solution.
Soak the tip of the electrode overnight in 0.1M HCl
Remove deposits by soaking the electrode in an HCl/
pepsin solution.
Remove deposits by soaking electrode in a thiourea
solution.
Run a new calibration after treatment.
Maintenance​ ​ 29