ROX
™
OPTICALDISSOLVEDOXYGENTROUBLESHOOTING
POST-CALIBRATION IS LOW
Verify that the ROX is in a saturated environment. If yes, then remove the wiper and the DO membrane
with the probe vertical while following instructions in the user manual. Inspect for moisture under the
membrane inside of the o-ringed area. If water is found clean on the optics or condensed moisture is
seen on the inside of the membrane surface, then rinse with DI water and dry. Inspect for damage,
reassemble and retest.
Note: Moisture under the membrane is usually a sign that a problem exists that will require membrane
replacement.
DO READS LOW IMMEDIATELY AFTER A WIPE CYCLE
This is normal! The wiper passing over the membrane will drop the reading 1.5%. The reading will
return to normal in less than 30 seconds. See Appendix M for more details.
DO READS LOW AFTER EXPOSURE TO FORMAZIN OR SODIUM SULFITE
The wiper pad will absorb these chemicals and apply it to the membrane on every wipe cycle. Remove
the wipers before exposure or change the pads after exposure.\
TESTING THE WIPER
All ROX probes use a magnetic sensor to park the wiper. This system also has the wiper rotate twice in
one direction and then reverse for one rotation. This parking system is unaffected by fouling and can use
any wiper. It is recommended that you use black or anti-fouling wipers with this probe. Failure of the
wiper to park correctly is a sign of a malfunction and requires repair before the probe can be used.
CHECK THE ODO GAIN
Check the ODO gain and verify that it is in the acceptable range of .85 to 1.15. It can be found in the
ADVANCED/CAL CONSTANTS MENU. If the ODO gain reads outside of this range or zero, perform
an UNCAL to reset the ODO gain to the factory default and recalibrate.
VERIFY THE CALIBRATION COEFFICIENTS
All ROX membranes have a specific set of calibration coefficients that were determined at the factory
during the manufacturing process. These coefficients are preloaded into all new ROX probes. When the
ROX membrane is replaced, the new coefficients must be manually entered into the sonde. These
coefficients are then loaded into the ROX probe and permanently stored. The coefficients can be viewed
or entered via the calibration menu of the ROX probe. If you are experiencing problems with calibrating
the ROX probe, verify that the calibration coefficients are present and that they match the set of
coefficients that were provided with the probe or membrane documentation.
(continued)
21
(43 pages)
(184 pages)
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