Hach AMTAX sc Mode D'emploi page 19

9 Tighten the sealing cap.
Membrane cap and electrolyte replacement:
Note: After the membrane cap and electrolyte are replaced, it takes up to 6 hours before optimum
performance is achieved.
The instrument calibrates for the first time after warming up the sample and reagent in the
measuring chamber for 5 minutes. After a second calibration one hour later, the
instrument changes to the adjusted calibration cycle.
Electrode replacement:
Note: After inserting a new electrode the instrument needs up to 12 hours (one night) to achieve the
optimum performance.
The instrument calibrates two times after warming up the sample and reagent in the
measuring chamber for 5 minutes. After two hours operating time in the measuring mode
the next calibration follows and after four hours it calibrates for the last time. Then the
instrument changes to the adjusted calibration cycle.
Note: There is no warning concerning the electrode slope during the membrane and electrode
replacement process. If there is an electrode slope outside the range from –50 mV to –67 mV, an
error message may occur.
Important note: After inserting a new electrode or restarting the instrument, the values for
the standard calibration change greatly, but after approximately two days the mV-values
for the standards should increase slight with the evaporation of the electrolyte. The slope
remains constant while both standard values increase parallel.
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10 Slide the electrode back
into the cell, towards the
resistance of the o-ring
of the measuring
chamber, until it snaps
into place and reconnect
the electrode cable to
the panel.
Close the enclosure
door.
Maintenance
19