Eureka Manta Manual
Page 36 of 67
3
Follow the Manta Control Software’s calibration instructions.
A clean wiper means better measurements. If the wiper pad has deteriorated or is clogged with debris
from your water (algae, silt, etc.), you should change it. For best results, you might consider changing the
wiper pad prior to each long-term deployment. To change the wiper pad:
1
Make sure you have the 1.5mm hex key and a new pad for the wiper.
Loosen the small set screw on the wiper arm.
2
Remove the wiper pad from the wiper arm and replace the pad.
3
Place a new wiper arm on the motor shaft so that the set screw faces
the flat spot on the motor shaft.
4
Gently press the wiper pad against the face of the probe until the pad
is compressed to roughly three quarters of its original thickness. It is
important that the wiper arm does not make contact with the probe
face – only the pad should be in contact. A gap of 0.5 mm between
the wiper arm and the probe face is typical when a new pad has been
installed. Another way of setting the pad gap is to place the pad such
that you can slide a small piece of paper under the pad, but snug
enough that the pad will hold the paper.
5
Tighten the set screw.
Do not over-tighten the set screw on the little rotating arm that holds the wiper pad; that
will strip the threads, and that will cause cursing once you realize what you did. And don’t
rotate the wiper arm manually; that will strip the gears and stick you with a big, hard-to-
explain repair bill.
Your turbidity sensor may be equipped at the factory with an extended brush arm. For best results, change
the brush frequently by pulling the old brush out of the brush arm body, and sliding a fresh brush into the
brush slot as shown below.
Use the first Allen wrench from your wiper kit to remove the standard turbidity sensor wiper. Use the
other Allen wrench to install the Eureka brush arm. Notice that the Allen set screw seats on the flat side
of the wiper motor shaft.