Xylem Aanderaa 4296 User manual

TD
320
OPERATION
MANUAL
TURBIDITY 4296
JUNE 2022
TURBIDITY SENSOR
4296

Page 2June 2022 – TD 320 OPERATING MANUAL – TURBIDITY SENSOR 4296
Preliminary September 2021
1st Edition October 2021
3rd Edition June 2022 Including TSS calculation and reorganizing chapters
© Copyright: Aanderaa Data Instruments AS
Contact information:
Aanderaa Data Instrument AS
PO BOX 103, Midttun
5843 Bergen, NORWAY
Visiting address:
Sandalsringen 5b
5843 Bergen, Norway
TEL: [phone]
FAX: [phone]
EMAIL: [e-mail]
WEB: http://www.aanderaa.com

June 2022 – TD 320 OPERATING MANUAL – TURBIDITY SENSOR 4296 Page 3
Table of Contents
INTRODUCTION...............................................................................................................................................................6
Purpose and Scope ..................................................................................................................................6
Document Overview .................................................................................................................................6
Applicable Documents ..............................................................................................................................7
Abbreviations............................................................................................................................................7
Short Description and Specifications ........................................................................................................... 8
1.1 Description..........................................................................................................................................8
1.2 Sensor versions available ...................................................................................................................8
1.2.1 Turbidity Sensor 4296 ..................................................................................................................9
1.3 Cross section with physical dimentions .............................................................................................10
1.4 Pin Configuration ..............................................................................................................................10
1.4.1 Lemo plug connection................................................................................................................11
1.5 Sensor Connection ...........................................................................................................................11
1.5.1 Configure sensor using RS-232 configuration cable...................................................................11
1.5.2 Configuration Cable 3855 ..........................................................................................................12
1.6 Using PC without COM-port..............................................................................................................12
1.7 User accessible sensor properties ....................................................................................................13
1.8 Passkey for write protection ..............................................................................................................13
1.9 Sensor Properties .............................................................................................................................14
1.9.1 Factory Configuration.................................................................................................................14
1.9.2 Deployment Settings ..................................................................................................................15
1.9.3 System Configuration.................................................................................................................16
1.9.4 User Maintenance......................................................................................................................17
1.10 Sensor parameters .........................................................................................................................18
1.11 Sensor integrated firmware .............................................................................................................18
1.12 Specifications..................................................................................................................................19
1.13 Manufacturing and Quality Control..................................................................................................19
Configuration on SeaGuard with display ...................................................................................................20
2.1 Installation on SEAGUARD®Platform ...............................................................................................20
2.2 Sensor Cable for remote sensor .......................................................................................................21
2.3 Sensor Configuration ........................................................................................................................22
2.3.1 Administrative Tools...................................................................................................................23
2.3.2 Sensor Identification ..................................................................................................................23
2.3.3 System Configuration.................................................................................................................24
2.3.4 Deployment Settings ..................................................................................................................26
2.3.5 User Maintenance......................................................................................................................28
Stand-alone Sensor configuration using Real-Time Collector...................................................................32
3.1 Establishing a new connection..........................................................................................................32
3.1.1 Add new connection to the list....................................................................................................32
3.1.2 Establish contact with the sensor ...............................................................................................33
3.2 Control Panel....................................................................................................................................34
3.2.1 Recorder Panel ..........................................................................................................................35
3.2.2 Device Configuration..................................................................................................................35

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3.3 Changing Values ..............................................................................................................................37
3.4 Deployment Settings.........................................................................................................................40
3.4.1 Common Settings ......................................................................................................................40
3.4.2 Site Info .....................................................................................................................................41
3.5 System Configuration........................................................................................................................42
3.5.1 Common Settings ......................................................................................................................43
3.5.2 Terminal Protocol.......................................................................................................................44
3.5.3 Output Settings ..........................................................................................................................45
3.6 User Maintenance.............................................................................................................................46
3.6.1 Mandatory..................................................................................................................................48
3.6.2 Site Info .....................................................................................................................................48
3.6.3 Serial Port ..................................................................................................................................49
3.6.4 Calibration..................................................................................................................................50
3.6.5 Sample Settings.........................................................................................................................50
Configuration via SmartGuard or SeaGuardII Datalogger.........................................................................51
4.1 Introduction.......................................................................................................................................51
4.2 Installation of the Turbidity Sensor 4296 on SeaGuardII ...................................................................51
4.3 Configuration with AADI Real-Time collector.....................................................................................52
4.3.1 Connected via SeaGuardII.........................................................................................................52
4.3.2 Connected via SmartGuard........................................................................................................52
4.4 Establish connection .........................................................................................................................52
4.4.1 Control Panel .............................................................................................................................55
4.5 Changing Values ..............................................................................................................................57
4.6 Deployment settings .........................................................................................................................60
4.6.1 Site Info .....................................................................................................................................61
4.7 System Configuration........................................................................................................................62
4.7.1 Output Settings ..........................................................................................................................63
4.8 User Maintenance.............................................................................................................................64
4.8.1 Mandatory..................................................................................................................................65
4.8.2 Site Info .....................................................................................................................................65
4.8.3 Calibration..................................................................................................................................65
4.8.4 Sample Settings.........................................................................................................................66
Stand-alone Sensor configuration using Terminal Software .....................................................................67
5.1 Sensor versions and interface...........................................................................................................67
5.2 Communication setup .......................................................................................................................67
5.3 Sensor startup ..................................................................................................................................67
5.3.1 Smart Sensor Terminal mode ....................................................................................................68
5.3.2 AiCaP mode...............................................................................................................................68
5.3.3 AADI Real-Time mode ...............................................................................................................68
5.4 Controlling communication................................................................................................................69
5.5 Description of protocol ......................................................................................................................69
5.6 Passkey for write protection ..............................................................................................................70
5.7 Save and Reset ................................................................................................................................71
5.8 Available Commands for the Turbidity Sensor ..................................................................................71

June 2022 – TD 320 OPERATING MANUAL – TURBIDITY SENSOR 4296 Page 5
5.8.1 The Get command .....................................................................................................................72
5.8.2 The Set command......................................................................................................................73
5.8.3 XML commands .........................................................................................................................73
5.8.4 Formatting the Output String ......................................................................................................73
5.8.5 Examples – How to configure sensor with Terminal Software ....................................................74
5.9 Help command output.......................................................................................................................76
5.10 Scripting -sending a string of commands ........................................................................................77
5.11 Sensor Configuration ......................................................................................................................78
Logging data via AADI Real-Time Collector ..............................................................................................80
6.1 Logging data on PC ..........................................................................................................................80
6.1.1 Enabling file output ....................................................................................................................80
6.1.2 Starting the sensor and logging to file ........................................................................................81
6.2 Viewing incoming data in real-time....................................................................................................83
6.2.1 Display data using Connection log .............................................................................................83
6.2.2 Display incoming data using Data Visualization .........................................................................85
Maintenance ..............................................................................................................................................87
7.1 Function Test....................................................................................................................................87
7.1.1 Function test connected to SEAGUARD®with display ...............................................................88
Theory of Operation ...................................................................................................................................90
8.1.1 Light Scatter...............................................................................................................................91
8.2 TSS ..................................................................................................................................................93
8.3 Total Suspended Solids Measurement Methods ...............................................................................93
8.3.1 Total Suspended Solids and Suspended Sediment Concentration by Weight ............................93
8.3.2 Total Suspended Sediment by Acoustic Doppler Measurements ...............................................94
8.4 FTU versus TSS ...............................................................................................................................94
Electro Magnetic Compatibility ..................................................................................................................95
9.1 EMC Testing.....................................................................................................................................95
9.2 Cables ..............................................................................................................................................95
9.3 Power – Voltage range .....................................................................................................................95
Documents and Accessories ...................................................................................................................96
10.1 Example of Test & Specifications sheet and Certificates.................................................................96
10.1.1 AADI Real-Time Collector connection with Windows 10.........................................................102
10.2 Connecting Cables........................................................................................................................103
10.2.1 Set-up and configuration cable 3855......................................................................................103
10.2.2 Set-up and configuration cable 4865......................................................................................104
10.2.3 Free end cable 4762 ..............................................................................................................105
10.2.4 Remote cable 4793 for connecting sensor to SeaGuard/SeaGuardII .....................................106
10.2.5 Patch cable 4999 ...................................................................................................................106
10.2.6 Cable 5236 for connection to SmartGuard using AiCaP.........................................................107

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INTRODUCTION
Purpose and Scope
With this document, we will give the reader knowledge on how to operate, calibrate and maintain
the Aanderaa Turbidity Sensor 4296. It also aims to give insight on how the Turbidity sensor
works. We cover all sensor versions in one single manual since the operation and configuration is
identical. The main difference is calibration range and depth rating.
The sensor is used either as part of a system or stand-alone. Chapter 2 to 5 covers different ways
to connect and operate the sensor. Since each chapter describes the full operation you only need
to read one of these chapters.
Optical Turbidity sensors for ocean and freshwater applications have been available for many
years from different vendors. The Aanderaa smart sensor family are known for the proven long-
term stability (years) and reliability and used in applications ranging from streams to the deepest
oceanic trenches on earth, from fish farms to wastewater, from polar ice to hydrothermal vents.
With the release of Framework 3 in 2011, Aanderaa introduced a new firmware version to
accommodate higher security and future expansion. Both the Smart Sensor Terminal protocol
and the AADI Real Time protocol was updated with this version of the Smart Sensor firmware.
Aanderaa Smart Sensors utilize communication protocols at the RS-232 interface where the
Smart Sensor Terminal protocol is a simple ASCII command string-based protocol and the AADI
Real Time is an XML based protocol.
Turbidity Sensor 4296 fits directly on the SeaGuard top-end plate and is interfaced by means of
a reliable CAN bus interface (AiCaP), using XML for plug and play capabilities. The sensor can
also be used as stand-alone sensor with RS-232 output. The sensor is available in three
different depth ratings, 300-meter, 3000-meter and 6000-meter.
Please note that the sensors need to be mounted without any obstruction in front of the sensors to
avoid reflection or blocked signal. With low Turbidity concentrations you need longer distance to
any reflecting objects to avoid disturbance.
Document Overview
Chapter 1 is a description of each sensor covered by this manual with pin configuration and
properties.
Chapter 2 is a description of how to configure the sensor when connected to a SeaGuard with
display
Chapter 3 is a description of how to configure a stand-alone sensor using AADI Real-Time
Collector
Chapter 4 describes how to configure the sensor using SeaGuard without display, SeaGuardII or
SmartGuard.
Chapter 5 describes how to configure and operate a stand-alone sensor using Terminal software.
Chapter 6 describes how to log data using AADI Real-Time Collector.
Chapter 7 describes maintenance need and recommendations
Chapter 8 describes the principle behind the Turbidity Sensor.
Chapter 9 describes Electromagnetic Combability.
Chapter 10 contains examples of all documents and available cables.

June 2022 – TD 320 OPERATING MANUAL – TURBIDITY SENSOR 4296 Page 7
Applicable Documents
Assembly Drawing 4296
Sensor Cable 3855, Sensor to PC, RS-232 for laboratory use
Sensor Cable 4865, Sensor to PC, RS-232 for field use
Sensor Cable 4762, Sensor to free end
Sensor Cable 4793 for remote sensors used on SeaGuard
Patch Cable 4999 for direct connection
Sensor Cable 5236 for connection to SmartGuard
Form 992
Test & Specification Sheet for Turbidity Sensor
Form 726
Calibration Certificate Temperature
Form 993
Calibration Certificate for Turbidity Sensor
D 424
Data sheet for Turbidity Sensor 4296
Abbreviations
ADC Analogue to Digital Converter
AiCaP Automated idle line CAN bus Protocol, a modified communication
protocol developed by Aanderaa for a distributed network of smart
sensors when connected to SeaGuard, SeaGuardII or SmartGuard
loggers.
ASCII American Standard Code for Information Interchange
DSP Digital Signal Processor
FNU Formazin Nephelometric Units
FTU Formazin Turbidity Unit
NTU Nephelometric Turbidity Units
LED Light Emitting Diode
MSB Most significant bit
UART Universal Asynchronous Receiver/Transmitter
RTC Real Time Clock
TSS Total Suspended Solids

Page 8 June 2022 – TD 320 OPERATING MANUAL – TURBIDITY SENSOR 4296
Short Description and Specifications
1.1 Description
The Aanderaa Turbidity Sensor 4296 are measuring optical backscatter in water.
Turbidity is the optical property of the water that causes light to be scattered by suspended
particles. High particle concentration causes high turbidity. By establishing the relationship
between turbidity and the local suspended matter this measurement can be used for assessing
the concentration of suspended matter.
The Turbidity Sensor 4296 measures the backscatter of infrared light.
A high efficiency light emitting diode is used to transmit modulated light into the water. The
backscattered light is picked up by a sensitive photodiode and this signal is then conditioned,
linearized and converted to data in engineering unit (FTU). In addition to turbidity, the sensor also
measures water temperature.
An FTU calibrated sensor will not be directly comparable to a NTU or FNU sensor since they are
only identical when measuring in Formazin. The measurement principle is different for the three
methods. For all other liquids except Formazin they will be different and there is no direct
correlation between the three methods.
The sensor is measuring approximately 35mm away from the sensor bot also objects close to this
point may influence the reading. This means that you should always try to mount the sensor with
free view.
1.2 Sensor versions available
The sensor is available with four different ranges:
4296 0-25 FTU
4296A 0-125 FTU
4296B 0-500 FTU
4296C 0-2500 FTU

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1.2.1 Turbidity Sensor 4296
Turbidity Sensor is encapsulated in a Titanium housing and are available in three depth ratings
300-meter, 3000-meter and 6000-meter. The sensor is designed for use on SeaGuard platforms
but may also be used on cable. Standard version has AiCaP and RS-232 output. Please note that
the lemo plug used for this sensor are not a 1 to 1 plug. This means that e.g. pin 1 on sensor are
connected to pin 8 on cable.
e
Figure 1-1 Illustration of the Turbidity Sensor 4296.
Figure 1-2: Turbidity Sensor 4296 Pin Configuration
Screws (6) for attaching the Securing Plate
Sensor Housing
Sensor foot
O-rings
Transmitting diode
Sapphire window
Receiving photo diode
Orientation pin

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1.3 Cross section with physical dimentions
1.4 Pin Configuration
The Turbidity Sensor 4296 pin configuration is given in Figure 1-2 above. A description of the receptacle
notation is given in Table 1-1.
Signal
Description
CAN_H
CAN bus line (dominant high)
NCG Node Communication Ground
NCR Node Communication Request
Gnd
Ground
Positive supply / V+ 5-14V positive supply
NCE
Node Communication Enable
BOOT_EN / Boot Enable Boot Load Enable (do not connect)
CAN_L CAN bus line (dominant low)
RS232 RXD / RXD RS232 Receive line
RS232 TXD / TXD
RS232 Transmit line
Figure 1-3: Turbidity sensor cross section
Table 1-1 Description of the Pin Configuration

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1.4.1 Lemo plug connection
The 4296 sensors are using a lemo plug. This plug is not a 1 to 1 plug like e.g. Subconn. See
Table 1-2 for a complete list of connections between sensor and cable plug or hub card plug.
Signal
Sensor pin
Cable pin
Positive supply / V+
1
8
Gnd
2
7
NCG 3 6
CAN_H 4 5
NCE
5
4
BOOT_EN / Boot Enable 6 3
RS232 RXD / RXD 7 2
RS232 TXD / TXD
8
1
NCR 9 10
CAN_L 10 9
1.5 Sensor Connection
Aanderaa offers a wide range of cables for different use of the sensors, both standard cables
using AiCaP or RS-232 but also special customer specified cables for use in project. See chapter
9.6 for an overview of standard cables or contact [e-mail] for more info. To
configure the sensor, it needs to be connected to an Aanderaa logger using AiCaP, a real-time
RS-232 cable or a RS-232 configuration cable.
1.5.1 Configure sensor using RS-232 configuration cable
Connect your sensor to one of the COM ports on your PC. If your PC comes without serial ports
(COM ports) you may also use an USB to Serial Adapter. We then recommend the Tripp-lite
Keyspan Model USA -19HS
The 3855 cable is a non-watertight 1.5-meter cable for laboratory use only used for connection
between sensor and PC in the office/lab. This is a standard cable that can also be used to
configure most other Aanderaa Smart Sensors as well.
The cable is supplied with a USB port providing power to the sensor from the PC USB port. A USB
extension cable is supplied with the cable so alternatively you may connect the free end to an
external power (6-14V). An alternative solution is to use a 9V alkaline battery (6LF22) to set the
sensor up or log it in the laboratory. Sensor Cable 3855 is also available in other lengths.
Table 1-2: Lemo plug Pin Configuration

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1.5.2 Configuration Cable 3855
1.6 Using PC without COM-port
If your PC comes without a COM-port we recommend to
use a USB to serial converter.
Figure 1-5 shows one alternative, Keyspan USA-19HS.
Connect the USB plug to your PC USB-port and then your
sensor to the 9pin DSub.
Figure 1-4: Set-up and configuration cable 3855
Table 1-3: Cable 3855 pin configuration
Signal
name Sensor plug 9-p D-Sub USB
TXD 1 2
RXD 2 3
Boot Enable 3
BV 4 4 (black)
GND 7 5 1 (red)
Positive Supply 8
RTS short to CTS 7-8
Figure 1-5: Serial to USB converter
Connection
to the
sensor
Connection to the
USB port for
power supply
Connection to an
external power
supply
(alternative2)
Connection to
the PC serial
Port

June 2022 – TD 320 OPERATING MANUAL – TURBIDITY SENSOR 4296 Page 13
1.7 User accessible sensor properties
All configuration settings that determine the behavior of the sensor are called properties and are
stored in a persistent memory block (flash). One property can contain several data elements of
equal type (Boolean, character, integer etc.). The different properties also have different access
levels.
To read the value of a certain properties you need to send ASCII string starting with the command
get and then followed by the property name to the sensor, see example below.
To change the content of a property you need to send an ASCII string starting with set and then
followed by the property name and new value in brackets to the sensor.
Get Interval //When sending this string to the sensor, it will then return the
value stored in this property.
Interval 4296 39 60.000 //Returned from sensor, where 4296 is the product number, 39
is the serial number of the sensor and 60 is the value stored as
interval. To change the value you might send the following
command:
Set Interval(30) //This will change the value for this property to 30 seconds
Save //Always end with save to store setting in flash
The interval will now be changed to 30 seconds. For more details, see CHAPTER 6
1.8 Passkey for write protection
To avoid accidental change, most of the properties are write-protected. There are four levels of
access protection, refer Table 1-4 .
A special property called Passkey must be set according to the protection level before changing
the value of properties that are write-protected, refer Table 1-4.After a period of inactivity at the
serial input, the access level will revert to default. This period corresponds to the Comm TimeOut
setting, or 1 minutes it the Comm TimeOut is set to Always On.
Table 1-4: Passkey protection
Output Passkey Description
No No Passkey needed for changing property
Low 1 The Passkey must be set to 1 prior to changing property
High 1000
The Passkey must be set to 1000 prior to changing property
This Passkey value also gives read access to factory properties
that usually are hidden
Read
Only Factory The user has only read access

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1.9 Sensor Properties
When using AADI Real-Time Collector you do not need to think about the command string sent to
the sensor since this is fully controlled by the software.
Some properties of the ‘AiCaP’ sensor will not be applicable / visible when the sensor is connected
to a SeaGuard, SeaGuardII or SmartGuard Datalogger, as the instrument will control these
properties.
All sensor properties are listed in chapters 1.8.1 through 1.8.4 .
1.9.1 Factory Configuration
All properties in this section are Read Only, not possible to overwrite for the user. Only certified
Aanderaa service personal can alter these settings. The access level for reading the status of this
properties is however different for each property, see table for more details. In this group we find
information about Software and hardware settings, Production, Service and Calibration dates.
Property Type
No of elements
Use
Category Access Protection
Read/Write
Product Name String 31 Aanderaa Product name
FC
No/
Read
Only
Product Number String 6 Aanderaa Product number
Serial Number INT 1 Serial Number
SW ID String 11 Software Identifier
SW Version INT 3 Software version (Major, Minor, Built)
HW ID X String 19 Hardware Identifier, X=1..3
High/
Read
Only
HW Version X String 9 Hardware Identifier, X=1..3
System Control INT 3 For internal use
Production Date String 31 AADI Production Date, format YYYY-MM-DD
Last Service String 31 Last service date, format YYYY-MM-DD,
empty by default
Last Calibration String 31 Last calibration date, format YYYY-MM-DD
Calibration Interval INT 1 Recommended Calibration Interval in Days
C2Range INT 1 Selecting the range. Range setting: 1=0-
25FTU, 2=0-125FTU, 3=0-500FTU and 4=0-
2500FTU
No/
Low
Table 1-5: Factory Configuration; Sensor Properties for Turbidity Sensor 4296.
ENUM=Enumeration, INT =Integer, BOOL=Boolean (‘yes’/’no’)

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1.9.2 Deployment Settings
Deployment Settings contains settings for instruments metadata like position and owner, but also
site dependent properties storing data that might influence the measurement.
Property
Type
No of elements
Use
Category Access Protection
Read/Write
Interval Float 1 Sampling Interval in seconds
DS No/No
Location String 31 Set the location
Geographic Position String 31 Set the geographic position
Vertical Position Float 1 User value for describing sensor position
Reference String 31 User setting for describing sensor reference,
user definable.
Table 1-6: Deployment Settings; Sensor Properties for Turbidity Sensor 4296.
ENUM=Enumeration, INT =Integer, BOOL=Boolean (‘yes’/’no’)

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1.9.3 System Configuration
This group contains properties used to set the mode, for parameter enabling and controlling the
output from sensor.
Property Type
No of elements
Use
Category Access Protection
Read/Write
Mode ENUM 1 Operation Mode: AiCaP, Smart Sensor Terminal,
AADI Real-Time, Smart Sensor Terminal FW2
SC
No/
Low
Enable Sleep BOOL 1 Enable sleep mode
Enable Polled
Mode BOOL 1
Enable Polled Mode (for RS232), when set to ‘no’
the sensor will sample at the interval given by the
Interval property, when set to ‘yes’ the sensor will
wait for the ‘Do Sample’ command.
Enable Text BOOL 1 Enable text, when set to ‘no’ the startup info and the
parameter text is removed
Enable
Decimalformat BOOL 1 Controls the use of decimal format in the output string
Enable
Rawdata BOOL 1 Controls inclusion of raw data in the output string
Enable
Temperature BOOL 1 Controls inclusion of Temperature in the output
Enable TSS BOOL 1 Controls inclusion of calculated TSS in the output
Table 1-7 Part 1 of 2: System Configuration; Sensor Properties for Turbidity Sensor 4296.
ENUM=Enumeration, INT =Integer, BOOL=Boolean (‘yes’/’no’)

June 2022 – TD 320 OPERATING MANUAL – TURBIDITY SENSOR 4296 Page 17
1.9.4 User Maintenance
This group mainly contains sensor settings that normally not altered by the user. To access most
of these properties you need to send set passkey(1000) or with Real-Time Collector use
password: 1000. These properties will configure serial port settings, communication to and from
sensor, temperature and range coefficients for each calibration range. It also contains properties
used to calculate TSS and to set the interval for the Transmitter Level reference diode.
Property Type
No of elements
Use
Category Access Protection
Read/Write
Node
Description
String 31 User text for describing node, placement etc. UM
No/
Low
Owner String 31 User setting for owners name UM No/
High
Baudrate ENUM 1 RS232 baudrate:
300,1200,2400,4800,9600,57600,115200 1)
UM
High/
High
Flow Control ENUM 1 RS232 flow control: None or Xon/Xoff
Enable
Comm
Indicator
BOOL 1 Enable the Communication Sleep (‘%’) and
Communication Ready (‘!’) indicators
Comm
TimeOut ENUM 1
RS232 communication activation timeout:
Always On,10 s,20 s,30 s,1 min,2 min,5 min,10
min
TempCoef Float 6 Curve fitting coefficients for the temperature
measurements.
C1R1Coef Float 6 Curve fitting coefficients Range 1: 0-25FTU
UM Low/
High
C1R2Coef Float 6 Curve fitting coefficients Range 2: 0-125FTU
C1R3Coef Float 6 Curve fitting coefficients Range 3: 0-500FTU
C1R4Coeff Float 6 Curve fitting coefficients Range 4: 0-2500FTU
C2R1Coef Float 6 Factory use only UM
High/
Read
Only
TSSCoef Float 6 Coefficients used to calculate TSS based on local
samples UM
Low/
High
TXReference
Interval INT 1 Transmit Level Reference use to compensate for drift in optics.
Table 1-8 Part 1 of 2: User Maintenance; ; Sensor Properties for Turbidity Sensor 4296. ENUM=Enumeration,
INT =Integer, BOOL=Boolean (‘yes’/’no’)

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1.10 Sensor parameters
Engineering data calculated by firmware in the sensor (Sensor Firmware) based on measured raw
data and sets of calibration coefficients stored in the sensor:
•Turbidity content presented in FTU (Formazin Turbidity Unit). Conversion to other
commonly used units is only possible when measuring in Formazin.
•TSS(Total Suspended Solids is presented in mg/l
•The ambient Temperature presented in ºC.
•TXCAmp() is presented in mV
The Turbidity raw data are the phase and amplitude of the returned signal after the
C1Amp(mV): Amplitude measurement with
C2Amp (mV): Amplitude measurement with
RawTemp(mV): Voltage from Thermistor Bridge.
To enable these parameters select Enable Rawdata(Yes).
Calibration coefficients are stored in the sensors flash and updated when recalibrated. If raw data
are not needed the user can select to turn off the delivery and logging of these.
1.11 Sensor integrated firmware
The main tasks for the sensor-integrated firmware are to control the transmitter, sample the
returned signal, extract the phase of this signal, and convert it into Turbidity.
All settings that are changeable for each individual sensor, e.g. calibration coefficients are called
sensor properties. The properties can be displayed and changed via RS-232 using AADI Real-
Time Collector or a terminal communication program. If connected to an Aanderaa it can also be
configured via an AiCaP bus.
The Turbidity Sensor will perform a measurement sample and present the result within the first 1.5
seconds after the sensor power up.

June 2022 – TD 320 OPERATING MANUAL – TURBIDITY SENSOR 4296 Page 19
1.12 Specifications
For product specifications refer Datasheet D424 on our web site http://www.aaderaa.com or
contact [e-mail]
You will always find the latest versions of our documentation on the web.
On our website, you will also find the latest version of product manuals, technical notes and
software. Please contact aanderaa.inf[email protected]om for guidance.
1.13 Manufacturing and Quality Control
Aanderaa Data Instruments products have a record for proven reliability. With over 50 years’
experience producing instruments for user in demanding environments around the globe; you can
count on our reputation of delivering the most reliable products available.
We are an ISO 9001, ISO 14001 and OHSAS 18001 Certified Manufacturer. As a company, we
follow three underlying principles: quality, service, and commitment. We take these principles
seriously, as they form the foundation upon which we provide lasting value to our customers.

Page 20 June 2022 – TD 320 OPERATING MANUAL – TURBIDITY SENSOR 4296
Configuration on SeaGuard with display
The 4296 Turbidity sensor is equipped with a CAN bus interface supporting AADI AiCaP
(Automated idle line CAN bus Protocol). This standard ensures easy plug and play connection to
all Aanderaa SeaGuard, SeaGuardII and SmartGuard data logger. Make sure the sensor is set to
AiCaP mode before you connect the sensor to the AiCaP bus. Default setting from factory is
AiCaP.
When connected to an AiCaP bus network the sensor will report its capabilities and specifications
to the data logger at power up. The data logger assembles the information and provides the user
with the possibility to configure the instrument based on the presented nodes. This solution
provides for greater flexibility on both use and design of the different elements within the system.
Note! This chapter describes the configuration of the Turbidity Sensor 4296 when connected to a
SeaGuard with display. Refer TD262a for a thorough description of how to configure the
SeaGuard Instrument, and to perform Node Identification and Recorder settings.
For configuration on SeaGuardII or SmartGuard, see CHAPTER 4.
2.1 Installation on SEAGUARD®Platform
The Turbidity Sensor 4296 designed for use with AADI SeaGuard data loggers fits directly on the
top-end plate or used with a cable. Before connecting the sensor always turn off the power. We
recommend that you install the Turbidity Sensor in sensor position 3, 4 or 6, refer Figure 2-1. If
mounted in position 6, use patch cable to connect the sensor to the HUB card.
Refer SeaGuard Platform Operating Manual,
TD262a, for an illustrated sensor installation guide.
TN309 holds an extract of sensor connection /
disconnection given in the SeaGuard Operating
Manual.
Note!
Always replace O-rings when removing,
exchanging, or installing a new sensor or a sealing
plug.
Figure 2-1: SeaGuard Top-end plate