SenTix
®
Maintenance and cleaning
7
ba75739e02
07/2013
Maintenance and cleaning
Refilling the
reference
electrolyte
During operation, a small amount of reference electrolyte leaks through the
junction from the combination electrode into the test sample. If the level of ref-
erence electrolyte becomes too low with time, refill it through the refilling
opening. Refilling is very easy with the enclosed dropping bottle. Proceed as
follows:
Cut off the tip of the dropping bottle at a right angle until the opening in the
tip can be seen
Open the refilling opening of the combination electrode
Press the tip of the dropping bottle into the refilling opening while turning
it slightly
Pump the reference electrolyte in the shaft using the dropping bottle
Pull the dropping bottle out of the refilling opening while turning it slightly
if necessary.
Cleaning
Remove water-soluble contamination by rinsing with deionized water. Re-
move other contamination as follows:
Note
Hydrofluoric acid, hot phosphoric acid and strong alkaline solutions destroy
the glass membrane.
Contamination
Cleaning procedure
Fat and oil
Rinse with water containing household
washing-up liquid
Lime and hydroxide deposits Rinse with citric acid (10 % by weight)
Proteins
Immerse in pepsin cleaning solution PEP/pH
for approx. 1 hour.
Note: Make sure the level of the reference
electrolyte is above that of the cleaning solu-
tion.
