Observator Instruments Analite NEP-9500-PLUS Series User manual

Manual | NEP-9500-PLUS series turbidity probe
Status: Final | Not confidential
Page 1 | 21
V20200309
Manual
NEP-9500-PLUS series turbidity probe
Version: 20200309
Status: Final
Confidentiality: Not confidential
Date: 09 March 2020
Author: Ludovic Grosjean
www.observator.com

Manual | NEP-9500-PLUS series turbidity probe
Status: Final | Not confidential
Page 2 | 21
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Document history
The Observator range is in continuous development and so specifications may be subject to change
without prior notice. When in doubt about the accuracy of this document, contact the Observator Group.
Reference documents
Type of document / tool
Product type and name (incl. url)
Datasheet
NEP-9500-PLUS
Manual
NEP-9500-PLUS
Application notes
Pressure calibration
Shroud installation
Temperature calibration
Wiper replacement
Revision history
Date
Amendments
Company, position
2017-10-24
Initial document creation
Observator Australia,
Document Controller
2018-04-09
Introduced document control
Observator Australia,
Document Controller
2018-06-03
Updated chapter 6
Observator Australia,
Document Controller
2019-03-06
Added reference documents
Observator Australia,
Document Controller
2019-07-04
Quality review
Observator Australia,
Operation Manager
2019-12-13
Replace NEP-9500 images
Observator Australia,
Document Controller
2019-12-15
Compress document
Observator Group,
Communication Officer
2020-01-30
Updated document format
Observator Australia,
Document Controller
2020-03-08
Updated installation section
Observator Australia,
Document Controller
Procedure sign-off:
Date
Company, position
Status
2018-04-09
Observator Australia, Document Controller
Finished
2019-12-16
Observator Australia, Managing Director
Approved
2020-03-04
Observator Group, Communication Officer
Approved
Distribution list
Date
Company, position

Manual | NEP-9500-PLUS series turbidity probe
Status: Final | Not confidential
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Summary
Thank you for purchasing an Analite NEP-9500 series turbidity probe. It will give you years of service if
you install and maintain it according to the guidelines set out in this manual.
The Analite NEP-9500 series of turbidity probes are an enhanced version of our successful Analite 90 and
95 series probes. They offer better performance; more output options and greater ease of deployment yet
are available in the same mechanical package (glanded version).
The Analite NEP-9500 series turbidity probes are designed for monitoring and process applications where
turbidity levels of up to 5,000NTU may be encountered. Standard ranges are 0NTU, 10NTU, 400NTU,
1,000NTU, 3,000NTU and 5,000NTU.
Specifically, the Analite NEP-9500 probes are designed for applications that will not allow bio-fouling to
build up such as short monitoring deployment or placement in fast and cold running water. The Analite
NEP-9500 probes however, with their integral wiper assembly, are designed where bio-fouling or
sedimentation build-up is likely. The Analite NEP-9500 series probe, with a stainless-steel case, may be
submerged to a depth of fifty meters. The composite case version is rated to two hundred meters.
The Analite NEP-9500 probes use 90° optics and employ infrared light in accordance with ISO-7027. All
probes use a unique modulation technique that ensures almost total rejection of ambient light conditions
as well as a unique microprocessor controlled differential sample and hold circuit for enhanced
performance, particularly at low turbidity levels. one hundred eighty degrees is also available which
measures up to 30,000NTU.

Manual | NEP-9500-PLUS series turbidity probe
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Table of contents
1Applications .................................................................................................................... 5
2Safety............................................................................................................................... 6
3Specification ................................................................................................................... 7
3.1 Glanded cable option (default)............................................................................................................7
3.2 SubConn option...................................................................................................................................7
4Pinout & wiring diagram................................................................................................. 9
4.1 Voltage output version.........................................................................................................................9
4.2 4-20mA current output version..........................................................................................................10
4.3 SubConn connection.........................................................................................................................11
4.4 Surge and lightning considerations...................................................................................................11
5What you will find in the box.........................................................................................12
6Accessories....................................................................................................................13
7Installation......................................................................................................................14
7.1 Installing the probe for the first time..................................................................................................14
7.2 Physical cabling considerations ........................................................................................................15
7.3 Miscellaneous....................................................................................................................................15
8Deployment ....................................................................................................................16
8.1 Installation .........................................................................................................................................16
8.2 Deploy the probe...............................................................................................................................17
8.3 Retrieve the probe.............................................................................................................................19
9Electrical conformity......................................................................................................20

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1 Applications
Analite NEP-9500 probes typical use includes applications such as:
1. Monitoring of streams and rivers
2. Monitoring of water storage bodies including stratification studies
3. Intermediate and final effluent treatment monitoring
4. Hydrological run off studies
5. Ground and bore water analysis
6. Drinking water filtration efficiency
7. Industrial process monitoring
8. Sludge and dredge monitoring
9. Sediment load monitoring
Which model is best used is dependent on the application, the measuring environment, the logging
equipment and the monitoring period (deployment times) required.
The Analite turbidity probes are not suitable in situations where they may be abraded by large particles
such as sand and under these circumstances the reading may become erratic due to the large particles
passing the optic sensor. Measuring turbidity under these circumstances will require a stilling well to allow
the sand particles to settle away from the optic sensor in the probe tip.

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2 Safety
Do not connect anything that is potentially electrical to the metal body of the sensor as it
may result in electrical shocks that could harm you or destroy your instruments.
Do not attempt to force the wiper mechanism while operating or you may harm yourself
due to the higher torque level.
Please check with your supplier or material specifications before using the sensor in an
unknown chemical.
Take appropriate precaution when handling or servicing pre-deployed sensors as you
may be exposed to radioactive and hazardous solutions.
After the end of the life of the product, please dispose this product according to your
local regulations or return it to the manufacturer.

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3 Specification
3.1 Glanded cable option (default)
Turbidity sensor dimensions
Length
320.4mm
Diameter
31.70mm
3.2 SubConn option
Turbidity sensor dimensions
Length
297mm
Diameter
31.7mm

Manual | NEP-9500-PLUS series turbidity probe
Status: Final | Not confidential
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Measurement
NEP-9500-PLUS
Technique
ISO-7027-90
Range
To customer requirements
Output span
±2.5V or 4 –20mA, where -2.5V or 4mA = 0NTU
0 to + V and 0 to +2.5V outputs are also available
Specify output at time of order
Response time
Approximately 1 second
Linearity
1% Accuracy
Repeatability @ 25°C
± 2% across the board
Temperature coefficient (0
to 40°C)
< ±0.05%/°C
Environmental
Static depth rating
200m (stainless steel casing), 50m (composite casing)
Operating temp.
-5°C to +40°C
Storage temp.
-20°C to +50°C
Wiper
Wiper arrangement
(NEP-9500 series only)
Disposable and consumable –Foam pad on Polyvinyl Chloride (PVC)
or Acetal arm. Field replaceable. Mounted on central shaft, fixed by
hex set screw on to the flat part of the wiper shaft.
Actuation
(NEP-9500 series only)
1. By external Transistor–Transistor Logic (TTL) / Complementary
Metal Oxide Semiconductor (CMOS) active low pulse or momentarily
contacting the wiper actuation conductor (pin 5) to 0V (pin 3).
2. Automatic wipe (periodic and power on). Please specify during the
order.
Actuation pulse duration
On NEP-9500 series only.
>50ms, <500ms.
Actuation pulse current sink
On NEP-9500 series only.
1mA max.
Wiping time
On NEP-9500 series only 8s nominal.
During the wipe, the output is held to the output value just prior to the
wipe.
Power
Operating voltage
8-30V Direct Current (DC).
Current consumption
25mA maximum when not wiping plus up to 60mA if current output is
fitted.
Power settling time
2s.
Wiping current
NEP-9500 series only. Additional 25mA approx. at less than 10m
submersion.

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4 Pinout & wiring diagram
Long cable lengths are common; therefore, some electrical factors should be considered and these are
discussed below.
There are two wiping protocols available on the NEP-9500 probes:
1. A single wipe externally initiated by momentarily resetting the probe (please specify during the
ordering).
2. A periodic automatic wipe (please specify during the ordering).
4.1 Voltage output version
Analite NEP-9500 probes may have an analogue voltage output with a nominal output impedance of 500
ohms. For particularly long cable runs, the 4-20mA current output version is recommended.
Wire color
Voltage option
Green
Ground (0V common)
Shield
Shield (no connection within probe)
Brown
8 to 30V DC power supply (+Ve)
Grey
Wiper (probe sleep/wipe)
Yellow
NTU voltage common
White
NTU voltage output

Manual | NEP-9500-PLUS series turbidity probe
Status: Final | Not confidential
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4.2 4-20mA current output version
Analite NEP-9500 probes may have an analogue 4-20 current output with a maximum load rating of 200
Ohms, consequently cable loop resistance should be considered. The Polyurethane (PUR) cable normally
supplied with the probes has a nominal loop resistance of 4.6 Ohms per 100m. A schematic of the probe
and its load is shown below.
For very long cable runs (>200m), it may be advisable to connect the “NTU return”conductor to the
“Supply Common”conductor at the end of the cable to reduce the voltage drop along the run.
When a NEP-9500 series probe is ordered with the 4-20mA current output, the probe is configured as a
(high) current source. The load must be less than 270 Ohms to ensure proper operation over the probe’s
specified power supply range.
Wire color
Voltage option
Green
Ground (0V common)
Shield
Shield (No connection within probe)
Brown
8 to 30V DC power supply (+Ve)
Grey
Wiper (probe sleep/wipe)
Yellow
NTU voltage common
White
NTU voltage output