NEP-9500 MANUAL V1.01
Observator Instruments V1.01
Copyright 2017
©
Page 15
8.
INSTALLATION
They are aspects to consider when preparing to install the ANALITE NEP-9500 series probes on the
field:
1. Installation of the probe proper into the environment where measurements are to take place.
2. Physical cabling considerations.
3. Electrical cabling considerations.
Install the probe for the first time
The probe is normally installed with the optics pointing downwards (but not vertical) or in a horizontal
alignment. In a simple application the probe is simply immersed into the water to the desired depth,
but within the depth rating of the probe. Please note the depth rating is based on static water.
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.
Probes with integrated wiping should be installed such that they can be easily retrieved from time to
time to replace the wiper arm assembly. It is important that the optic end of the probe is kept clear of
obstruction such as the river bed. The minimum distance between the optic head and any object
should be 50mm (2”).
The standard casing of the ANALITE NEP-9500 series probes are made of 6 stainless steel but the
optic face is made of plastic materials and so 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.
To avoid crevice corrosion on the 6 stainless steel casing in salt and acidic water deployments it is
strongly recommended that the probe be thoroughly washed in clean water after deployment and
prior to storage. Failure due to crevice corrosion is not covered under warranty. A composite cased
version is available for corrosive and sea water environments but its pressure rating is limited to
30m.
If the probe is to be installed in a glanded fitting (for insertion into a pipe etc.) then 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 ANALITE NEP-9500 series probes
are thin wall instrument 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. A shroud is available for the NEP-9500 as an
accessory under the part number NEP-9SHRD. Such a shroud not only protects the probe but also
assist in maintaining a minimum distance between probe optics and any local obstructions.
