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MODEL RDO
7.1 ANALYZER
7.1.1 Cleaning the analyzer enclosure
Clean the analyzer case and front panel by wiping with
a clean, soft cloth dampened with water ONLY. Do not
use organic solvents.
7.1.2 Replacing the desiccant
Periodically inspect the desiccant bag in the analyzer
enclosure. Replace the desiccant (PN R0087630)
when the indicator beads turn from blue to pink.
7.1.3 Replacing the clock battery
The clock battery is located at the bottom of the back of
the enclosure cover. To replace the battery:
1. Disconnect AC power to the instrument.
2. Remove the enclosure cover.
3. Remove the clock battery and replace it with a 3V
MnO
-Li battery, CR2032 or equivalent.
2
4. Dispose of spent battery properly.
5. Replace the cover.
6. Restore AC power.
7.2 RDO PROBE
7.2.1 Cleaning the sensing cap
1. Leave the sensing cap and nose cone attached
to the probe body. Do not remove the sensing
cap to clean it.
2. Rinse the cap with clean water from a squirt bottle.
3. If biofouling is present, gently wipe the cap with a
soft-bristled brush or a soft cloth. If oil or grease is
present, wash with a gentle detergent.
4. If extensive fouling or mineral build-up is present,
soak the cap end of the sensor—do not remove
the sensing cap—in vinegar for 15 min., then soak
in deionized water for 15 min. Do not use organic
solvents.
5. After cleaning the sensor, check the calibration in
air. Perform a one- or two-point saturation calibra-
tion if necessary.
7.2.2 Cleaning the probe body
1. Leave the sensing cap and nose cone attached
to the probe body while cleaning it. Do not
remove the sensing cap.
SECTION 7.0
MAINTENANCE
2. Gently scrub the probe body with a soft-bristled
brush or a nylon dish scrubber. Use a mild detergent
to remove oil or grease. Soak in vinegar followed by
deionized water to remove mineral deposits or ex-
tensive fouling. See step 4 in section 7.2.1.
7.2.3 Cleaning the optical window
Clean the optical window only when the sensing
cap is replaced. See section 7.2.4.
7.2.4 Replacing the sensing cap.
1. The replacement sensing cap kit (PN R0084230)
contains a sensing cap, two O-rings, O-ring lubri-
cant, and a lens wipe.
NOTE: Keep the cap in its sealed packaging until
you are ready to install it. Install promptly. Avoid
allowing moisture, including humidity, inside
the cap.
2. Remove the sensor from the process liquid. Rinse
with water and dry the probe body and nose cone.
3. Unscrew the nose cone.
4. Pull the sensing cap straight off the probe body. Do
not twist.
5. Remove and discard the existing O-rings.
6. Remove any moisture in the O-ring grooves. Be
careful not to touch the lens.
7. Use your finger to apply a thin layer of lubricant
around the O-ring grooves. Be careful not to get
grease on the lens or on the sensor pins.
8. Slide the two O-rings onto grooves. Check that the
O-rings are not twisted or pinched. Apply a thin layer
of lubricant over the O-rings and grooves. Be care-
ful not to get grease on the lens or on the sen-
sor pins.
9. Clean the lens with the wipe provided in the kit,
and allow it to dry thoroughly. Inspect the lens for
scratches or dirt.
10.Remove the new sensing cap from its sealed pack-
aging. Align the arrow on the cap with the index
mark on the probe and firmly press the cap onto the
probe, without twisting, until it seals. Replace the
nose cone.
11. Perform a one- or two-point saturation calibration.
7.2.5 Storing the probe
Store the probe in the calibration chamber using the
storage cap (cap without notch). Place a few drops of
water in the chamber before inserting the probe.
MAINTENANCE
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