Oxygen Sensor - Hach ORBISPHERE GA2X00 O2 EC Allgemeines Benutzerhandbuch

25. Rinse the sensor under a tap for about 5 seconds to remove any excess electrolyte, then gently
wipe with a soft tissue to ensure all parts are completely dry. Drain the overflow electrolyte from
the container into a sink and flush away. Discard the used container.
26. If not using a protection cap with grille proceed to step 27. Otherwise, take a new Dacron
patch from the box of O-rings in the recharge kit. Place the mesh in the center of the protection
cap. It is very important that the mesh is in the center of the protection cap and covering the
entire grille. Lower the sensor onto the protection cap making sure not to disturb the mesh.
27. Push the protection cap firmly into place, making sure one of the four slots in the protection cap
fits over the small locking pin (highlighted right). If it is necessary to turn the protection cap to fit
over the locking pin, ensure you only turn it clockwise to avoid unscrewing the cartridge.
28. Finally, screw the protection cap locking washer back into place in a clockwise motion, and
tighten finger tight.
Section 7 Troubleshooting

7.1 Oxygen sensor

Problem
Sensor won't calibrate, even after
cleaning and/or membrane
change.
"0000" O levels displayed.
2
Shorter than expected sensor
operation in relatively high
dissolved O concentration.
2
20 English
Probable cause
Instrument internal
barometric pressure
sensor needs calibration.
Wet membrane
interface.
"H S insensitivity" option
2
enabled.
Wrong reading scale
"XXXX" selected for
display unit.
High O concentrations
2
generate deposits more
quickly.
Possible solution
Calibrate using a certified barometer. Do not
correct for sea level !
Wipe dry with a tissue and re-calibrate.
Disable from the menu on the measuring
instrument.
Change reading scale by selecting "X.XXX, XX.XX
or XXX.X" on the instrument.
Install a less permeable membrane.
Turn off the analyzer when sensor is not in a low
O concentration.
2
®
mesh