Xylem EXO Series User Manual page 104

Wiper
6.15
Maintenance and Storage
Follow these instructions to replace the wiper brush assembly or brush guard component on the central wiper
module on the EXO2 sonde. We recommend changing the wiper between deployments to avoid sediment
carryover, which can compromise calibration and data collection. For long- and short-term storage, the
wiper requires minimal precautions. Users can either remove the wiper or leave it installed in the sonde. If left
installed on the sonde, follow guidelines for sonde storage. If users remove it from the sonde, the wiper may be
stored in dry air in its shipping cap to protect against physical damage.
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1 Replace wiper brush.
Loosen set screw with 0.050 in. Allen wrench.
Remove old brush assembly and clean any residue from
wiper shaft and wiper end cap.
Install new brush assembly, gently pressing the wiper arm
down against shoulder on wiper shaft.
Tighten set screw to a torque of 4 inch-pounds. While
tightening, gently and slowly rock the brush to ensure a
tight fit against the D shaft.
Check snugness of wiper by gently rocking 5 degrees in
either direction.
2 Replace brush guard.
Loosen #6-32 x 3/8 inch long socket-cap screw with a 7/64
inch Allen wrench.
Note position of the guard, then remove the old part and
clean any residue from motor housing.
Remove cover on adhesive strip on the inside of the brush
guard.
Ensure the brush is in its normal parked position.
Carefully install new brush guard in same position as
old guard—centered between ports 1 & 6 and with brush
centered in well as shown. Tighten set screw until snug.
Note: The adhesive on the guard strap, which facilitates
installation, may make it difficult to re-position the wiper
guard after it's been installed. Take caution to mark
the position of the old guard before removing it and
installing the new one in the same location. Confirm that
the new guard is aligned with the *female* side of the
4-pin connector at the bottom of the probe, and properly
centered between ports 1 and 6 after the wiper has been
installed in the sonde.