Observator Instruments NEP-9500 Series User manual

Observator Instruments V1.01 Copyright 2017 ©
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NEP-9500 SERIES
TURBIDITY PROBE
User Manual
Version 1.01 – Oct 2017
Author: Observator Instruments
NEP-9500 SERIES
TURBIDITY PROBE
ABN 56 007 283 963
8-10 Keith Campbell Court, PO Box 9039
Scoresby, VIC 3179 AUSTRALIA
Tel: [phone], Fax: [phone]
Email: [e-mail]
Web: www.observator.com
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NEP-9500 MANUAL V1.01
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Observator Instruments V1.01 Copyright 2017 ©
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Document History
Paper copies are valid only on the day they are printed. Contact Observator Instruments if any
doubt about the accuracy of this document.
Revision History
This document has been revised by:
Revision Number
Revision Date
Summary of Changes
Author
V1.01
24-10-17
Updated general content
Ludovic Grosjean
Reference Documents
Please see the following documents for more information:
Document
Name
Download from
Author
Online
Training
documents
http://download.observator.com/files/?dir=User
manuals/NEP-9500
Ludovic
Grosjean
Latest
NEP5000
Manual
http://download.observator.com/files/?dir=Software/NEP50xx
Provides an in-depth information of the configuration and
calibration.
Niran
Pelpola
Distribution list
This document has been distributed to:
Name
Company, Position
Action
Dana Galbraith
Director at Observator
Instruments
Review
ABN 56 007 283 963
8-10 Keith Campbell Court, PO Box 9039
Scoresby, VIC 3179 AUSTRALIA
Tel: [phone], Fax: [phone]
Email: [e-mail]
Web: www.observator.com
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INDEX
INDEX...................................................................................................................................... 3
1. NEP-9500 INTRODUCTION ........................................................................................... 5
2. APPLICATIONS .............................................................................................................. 6
3. SAFETY .......................................................................................................................... 7
4. SPECIFICATION ............................................................................................................. 8
5. PINOUT & WIRING DIAGRAM ..................................................................................... 10
Voltage Output version ....................................................................................................... 10
4-20mA Current Output version ......................................................................................... 11
Subconn connection ........................................................................................................... 12
Surge and Lightning considerations ................................................................................. 12
6. DESCRIPTION .............................................................................................................. 13
7. ACCESSORIES ............................................................................................................ 14
8. INSTALLATION ............................................................................................................ 15
Install the probe for the first time ...................................................................................... 15
Physical cabling considerations ........................................................................................ 16
Miscellaneous ...................................................................................................................... 16
9. DEPLOYMENT .............................................................................................................. 17
Installation ............................................................................................................................ 17
Deploy the probe ................................................................................................................. 18
Retrieve the probe ............................................................................................................... 19
10. MAINTENANCE ............................................................................................................ 20
Wiper replacement .............................................................................................................. 20
Cleaning the sensor ............................................................................................................ 22
11. ELECTRICAL CONFORMITY ......................................................................................... 23
EC Declaration of Conformity according to Council Directive 89/336/EEC ................... 23
12. SERVICE & SUPPORT COVERAGE ............................................................................. 24
Warranty conditions ............................................................................................................ 25
Contact & more information ............................................................................................... 25

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1. NEP-9500 INTRODUCTION
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 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 1,000NTU 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 buildup is likely. The
ANALITE NEP-9500 series of probe with a stainless steel case may be submerged to
a depth of 50 meters. The composite case version is rated to 200 meters.
The ANALITE NEP-9500 probes use 90° optics and employ infrared light in accordance
with ISO7027. 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. 180 degrees is also available which measures up to 30,000NTU.

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2. APPLICATIONS
ANALITE NEP-9500 probes typical use include 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 circumstance 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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3. SAFETY
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For correct functioning of Observator NEP-9500, the
sensors must be installed according installation
instructions.
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Never obstruct the wiper or prevent the wiper from
wiping.
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Always clean and dry the sensor after use.
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After end of life dispose this product according local
regulations or return to manufacturer.
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4. SPECIFICATION
Glanded cable option (default)
Turbidity sensor Dimensions
Length
320.4mm
Diameter
31.70mm
Subconn option
Turbidity sensor Dimensions
Length
297mm
Diameter
31.7mm

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Measurement
NEP-9500-PLUS
Technique
ISO7027-90°
Range
To customer requireme n ts
Output Span
±2.5Volts 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
Approx 1 second.
Linearity
1%
0 to 10NTU
1%
0 to 400NTU
2%
0 to 1,000NTU
5%
0 to 3,000NTU
Repeatability @
25°C
± 2% across the board
Temp e r a tu re
Coefficient (0 to
40°C)
< ±0.05%/°C
Calibration
compliance using
APS AEPA
polymer solutions
3 points calibration to range
2 points calibration to output span
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 PVC or Acetal arm. Field
replaceable. Mounted on central shaft, fixed by hex set screw onto flat of
wiper shaft.
Actuation
(NEP-9500 SERIES only)
1. By external TTL/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.
>50mSec, <500mSec
Actuation Pulse Current Sink
On NEP-9500 series only.
1mA max.
Wiping Time
On NEP-9500 series only 8 second nominal.
During the wipe the output is held to the output value just prior to the
wipe.
Power
Operating Voltage
8-30V DC
Current Consumption
25mA maximum when not wiping plus up to 60mA if current output fitted.
Power Settling Time
2 Sec
Wiping Current
NEP-9500 series only. Additional 25mA approx. at less than 10m
submersion.

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5. PINOUT & WIRING DIAGRAM
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Because long cable lengths are common some electrical factors should be taken into account and
these are discussed below.
There are two wiping protocols available on the NEP-9500 probes:
1. A single wipe externally initiated by momentarily reseting the probe (specify
during the ordering).
2. A periodic automatic wipe (specify during the ordering).
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