NEP-9500 MANUAL V1.01
Observator Instruments V1.01
Copyright 2017
©
Page 19
4.
Allowances must be made for the effect of flowing water
to ensure the static depth rating
is not exceeded. If the probe is to be installed downwards then it is recommended to
install
it a few degrees away from the vertical
to allow bubbles to escape away from the optic
face.
5. Probes with integrated wiping should be installed such that they can be easily
retrieved from time to time to replace the wiper arm assembly
.
6.
It is important that the
optic
end of the probe is
kept clear of obstruction
such
as the river/sea bed. The minimum distance between the optic head and any object should
be 50mm (2”).
Be Careful: The standard casing of the NEP-9500 as well as the optic face is made of plastic
materials and should be protected from accidental scratching or abrasion. The wiper arm assembly
should be replaced periodically to avoid abrasive material build-up in the pad that may eventually
abrade the optic face. The optic face is partially protected from damage by the protruding castellation
in the probe casing.
If the probe body is to be installed in a glanded fitting (for insertion into a pipe, etc. ) the care must
be taken to ensure the sealing surface pressures offered by the gland fitting are not excessive so
as to not cause distortion of the probe casing and force leakage. The NEP-9500 probes are thin wall
instruments and so glanding pressure must be minimal and spread over the largest possible area.
Do not cut or damage the outer sheath of the cable. Water may enter the probe through holes or
cuts in the cable sheath. Where damage may occur due to river rocks striking or rolling over the
probe body, a protective shroud should be used which can be made of simple PVC piping or
stainless steel whichever the situation warrants. Such a shroud not only protect the probe but also
assist in maintaining a minimum distance between probe optics and any local obstructions.
Retrieve the probe
Carefully pull the sensor out of water. Clean the sensor with fresh water and carefully dry the
connector (blow air if necessary), then disconnect the cable from the connector. Store the probe in
appropriate conditions.
